IB-50060 PowlVac Type ITE HK 15kV

Transcription

IB-50060
INSTRUCTIONS
POWLVAC® TYPE 15KV ITE HK
REPLACEMENT VACUUM CIRCUIT BREAKER
Model 15PV25HKX3 1200A & 2000A
Installation
Maintenance
Renewal Parts
POWELL ELECTRICAL MANUFACTURING COMPANY
8550 MOSLEY DRIVE • HOUSTON, TEXAS 77075 • USA
PHONE (713) 944-6900 • FAX (713) 947-4453
http://www.powellelectric.com
http://www.powellservice.com
©2001 POWELL ELECTRICAL MANUFACTURING COMPANY
ALL RIGHTS RESERVED
12/2004
PowlVac® Type 15kV ITE HK Replacement
Vacuum Circuit Breaker
IB-50060
Contents
Section
I.
Page
INTRODUCTION ............................................................................................................ 6
A. SCOPE ................................................................................................................................................ 6
B. PURPOSE ........................................................................................................................................... 6
C. INSTRUCTION BULLETINS AVAILABLE ELECTRONICALLY ........................................................ 6
II.
SAFETY .......................................................................................................................... 6
A. GENERAL ........................................................................................................................................... 7
B. SPECIFIC ............................................................................................................................................ 7
C. X-RAYS ................................................................................................................................................ 7
D. SAFETY LABELS ................................................................................................................................ 7
III.
DESCRIPTION ............................................................................................................... 8
A. GENERAL ........................................................................................................................................... 8
B. THE STORED ENERGY MECHANISM ............................................................................................. 9
C. SAFETY INTERLOCKS AND PROVISIONS ................................................................................... 15
1) Position Interlocks ........................................................................................................................ 15
2) Circuit Breaker Compartment Safety Provisions ......................................................................... 15
3) Circuit Breaker Racking Mechanism ........................................................................................... 16
4) Mechanism-Operated Cell (MOC) Switch ................................................................................... 16
5) TOC (Truck-Operated Contact) Actuator ....................................................................................... 16
D. VACUUM INTERRUPTER CONNECTIONS ................................................................................... 17
E. OPERATING SOLENOIDS ............................................................................................................... 17
F.
THE ANTI-PUMP RELAY.................................................................................................................. 17
G. MOTOR CUTOFF SWITCH .............................................................................................................. 17
H. VACUUM INTERRUPTERS ............................................................................................................. 17
IV.
INSTALLATION ............................................................................................................ 17
A. RECEIVING ....................................................................................................................................... 17
B. HANDLING ........................................................................................................................................ 17
C. STORAGE ......................................................................................................................................... 17
D. PLACING THE CIRCUIT BREAKER INTO SERVICE .................................................................... 18
1) High Voltage Insulation Integrity .................................................................................................. 18
2) Vacuum Integrity .......................................................................................................................... 19
4) Mechanical Operation Check ....................................................................................................... 20
3) Control Voltage Insulation Integrity .............................................................................................. 20
5) Electrical Operation Check .......................................................................................................... 20
E. INSERTING THE CIRCUIT BREAKER INTO THE SWITCHGEAR EQUIPMENT ........................ 20
V.
MAINTENANCE ........................................................................................................... 21
2
IB-50060
Contents
Section
Page
A. GENERAL DESCRIPTION ............................................................................................................... 21
1) Introduction .................................................................................................................................. 21
2) Inspection and Cleaning .............................................................................................................. 22
B. MECHANISM AREA .......................................................................................................................... 22
1) Mechanical Operation .................................................................................................................. 22
2) Lubrication ................................................................................................................................... 23
3) Closing Spring Removal and Slow Closing of the Breaker Mechanism ...................................... 27
4) Latch Check Switch Adjustment .................................................................................................. 28
5) Mechanism Adjustments .............................................................................................................. 29
6) Electrical Operation ..................................................................................................................... 30
C. VACUUM INTERRUPTER AND CONTACT AREA .......................................................................... 30
1) Vacuum Interrupter and Contact Erosion ..................................................................................... 30
2) Sliding Contact Finger Wear ........................................................................................................ 31
3) Vacuum Integrity .......................................................................................................................... 31
4) Mechanical Adjustment of Vacuum Interrupters .......................................................................... 31
D. OPTIONAL MAINTENANCE PROCEDURES ................................................................................. 31
1) High Potential Tests ..................................................................................................................... 31
2) Timing .......................................................................................................................................... 31
3) Primary Resistance Check .......................................................................................................... 32
VI. RECOMMENDED RENEWAL PARTS AND REPAIR PROCEDURES ..................... 32
A. ORDERING INSTRUCTIONS .......................................................................................................... 32
B. RECOMMENDED RENEWAL PARTS ............................................................................................. 32
C. REPLACEMENT PROCEDURES .................................................................................................... 36
1) Closing Coil Assembly ................................................................................................................. 36
2) Primary Shunt Trip Coil Assembly ............................................................................................... 36
3) Charging Motor Assembly ............................................................................................................ 36
4) Anti-Pump Relay Assembly ......................................................................................................... 37
5) Latch Check Switch Assembly ..................................................................................................... 37
6) Motor Cutoff Switch Assembly ..................................................................................................... 37
7) Auxiliary Switch Assembly ........................................................................................................... 38
3
IB-50060
Figures
Figure
Page
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Front View of PowlVac® Type ITE HK Circuit Breaker with the Front Cover Installed ..................... 8
Front View of Type ITE HK Circuit Breaker with Cover Removed ..................................................10
Left Side View with the Barrier Removed .......................................................................................12
Right Side View with the Barrier Removed ..................................................................................... 12
Left Side View with Cover Installed ................................................................................................13
Right Side View with Cover Installed .............................................................................................. 13
Cam and Fundamental Linkage Positions ......................................................................................14
Mechanical and Trip Linkages ........................................................................................................14
Switchgear Compartment ...............................................................................................................15
Circuit Breaker Interior with Cover Removed .................................................................................16
Lubrication ......................................................................................................................................25
Lubrication ......................................................................................................................................26
Main Closing Spring Assembly Compressed for Removal ............................................................. 27
Main Closing Spring Assembly Installed .........................................................................................27
Latch Check Switch Adjustment .....................................................................................................28
Primary and Secondary Trip Prop Adjustment ............................................................................... 29
Primary Trip Prop Adjusting Screw ................................................................................................. 29
Control Devices ..............................................................................................................................33
Tables
Table
Table A.
Table B.
Table C.
Table D.
Table E.
Table F.
Table G.
Page
Field Dielectric Test Values ................................................................................................................ 18
Lubrication ......................................................................................................................................... 24
Timing ................................................................................................................................................ 31
Primary Resistance ............................................................................................................................ 32
Interrupter Assemblies ....................................................................................................................... 33
Control Devices .................................................................................................................................. 34
Miscellaneous Parts ........................................................................................................................... 35
4
!
IB-50060
WARNING
THIS EQUIPMENT MAY CONTAIN HIGH VOLTAGES AND CURRENTS
WHICH CAN CAUSE SERIOUS INJURY OR DEATH.
THIS EQUIPMENT IS DESIGNED FOR USE, INSTALLATION, AND
MAINTENANCE BY KNOWLEDGEABLE USERS OF SUCH
EQUIPMENT HAVING EXPERIENCE AND TRAINING IN THE FIELD OF
HIGH VOLTAGE ELECTRICITY. THIS DOCUMENT, AND ALL OTHER
DOCUMENTATION SHALL BE FULLY READ, UNDERSTOOD, AND
ALL WARNINGS AND CAUTIONS SHALL BE ABIDED BY. IF THERE
ARE ANY DISCREPANCIES OR QUESTIONS, THE USER SHALL
CONTACT POWELL ELECTRICAL MANUFACTURING COMPANY
IMMEDIATELY AT 1-800-480-7273.
!
WARNING
BEFORE ANY ADJUSTMENT, SERVICING, PARTS REPLACEMENT,
OR ANY OTHER ACT IS PERFORMED REQUIRING PHYSICAL
CONTACT WITH THE ELECTRICAL WORKING COMPONENTS OR
WIRING OF THIS EQUIPMENT, THE POWER SUPPLY MUST BE
DISCONNECTED. FAILURE TO FOLLOW THIS WARNING MAY
RESULT IN INJURY OR DEATH.
5
!
IB-50060
IMPORTANT
THE INFORMATION IN THIS INSTRUCTION BULLETIN IS NOT INTENDED TO EXPLAIN ALL
DETAILS OR VARIATIONS OF THE 15kV TYPE ITE HK CIRCUIT BREAKER, NOR TO PROVIDE
FOR EVERY POSSIBLE CONTINGENCY OR HAZARD TO BE MET IN CONNECTION WITH
INSTALLATION, TESTING, OPERATION, AND MAINTENANCE OF THE EQUIPMENT. FOR
ADDITIONAL INFORMATION AND INSTRUCTIONS FOR PARTICULAR PROBLEMS, WHICH ARE
NOT PRESENTED SUFFICIENTLY FOR THE USER’S PURPOSES, CONTACT POWELL
ELECTRICAL MANUFACTURING COMPANY AT 1-800-480-7273.
I.
To the extent required, the products described herein
meet the applicable ANSI, IEEE, and NEMA Standards; however, no such assurance is given with
respect to local codes and ordinances because they
vary greatly.
INTRODUCTION
A. SCOPE
This instruction bulletin describes the following
PowlVac® Type 15kV ITE HK replacement circuit
breaker:
C. INSTRUCTION BULLETINS AVAILABLE
ELECTRONICALLY
15PV25HKX3 1200A & 2000A
Many Powell Electrical Manufacturing Company
instruction bulletins are posted on the company Web
site at www.powellservice.com. For more information
contact Powell Apparatus Service Division (PASD) by
calling telephone number 1-800-480-7273 or
713-944-6900 or by email at info@powellservice.com.
15PV36HKX3 1200A & 2000A
B. PURPOSE
This instruction bulletin is intended to provide the
information required to properly operate and maintain
the circuit breakers described in Section A. Scope.
II.
This instruction bulletin provides:
1. Guidelines for safety
SAFETY
Study this instruction bulletin and all other associated
documentation before uncrating the circuit breakers.
2. General descriptions of the operation and
maintenance of the circuit breakers
Each user has the responsibility to instruct and
supervise all personnel associated with usage,
installation, operation, and maintenance of this
equipment on all safety procedures which must be
observed. Furthermore, each user has the responsibility of devising a complete safety program for each
type of equipment encountered.
3. Instructions for installation and placing the circuit
breakers into service
4. Instructions for part replacement
5. Renewal parts lists
6. Procedure for critical adjustments
The circuit breakers described in this instruction
bulletin are operated by high energy, high speed
mechanisms interlocked to provide specific operating
sequences. To ensure the safety of personnel
associated with usage, installation, operation, and
maintenance of these circuit breakers, it is mandatory
that the following rules be observed. These rules
are not intended to be a complete safety program,
but are intended to cover only the important
aspects of personnel safety related to PowlVac®
circuit breakers.
7. Illustrations, photographs, and description of the
circuit breaker
It should also be noted that some of the illustrations
contained herein may not represent the exact construction details of each particular type. These
illustrations are provided as general information to
aid in showing component locations.
6
A. GENERAL
6. All components shall be disconnected by
means of a visible break and securely
grounded for the safety of personnel performing maintenance operations on the circuit
breakers.
1. Only supervised and qualified personnel trained
in the usage, installation, operation, and maintenance of power circuit breakers shall be allowed
to work on this equipment. It is mandatory that
this instruction bulletin, any supplements, and
service advisories be studied, understood, and
followed.
7. Interlocks are provided to ensure the proper
operating sequences of the circuit breakers and
for the safety of the user. If for any reason an
interlock does not function as described, do not
make any adjustments, modification, or deform
the parts. DO NOT FORCE THE PARTS INTO
POSITION. CONTACT POWELL ELECTRICAL
MANUFACTURING COMPANY FOR INSTRUCTIONS.
2. Maintenance programs must be consistent with
both customer experience and manufacturer’s
recommendations, including service advisories
and the instruction bulletin(s). A well-planned and
executed routine maintenance program is essential for circuit breaker reliability and safety.
C. X-RAYS
3. Service conditions and circuit breaker applications shall also be considered in the development
of such programs, including such variables as
ambient temperature and humidity, actual continuous current, thermal cycling, number of
operations, interrupting duty, and any unusual
local conditions such as excessive dust, ash,
corrosive atmosphere, vermin, and insect problems.
When high voltage is applied across the contacts of a
vacuum interrupter, there is the possibility of generation of X-rays. The intensity of the X-radiation is
dependent on the peak voltage and the contact gap.
At the normal operating voltage for this type of
equipment, the radiation levels are negligible. At the
voltages specified for testing, test personnel shall be
in front of the circuit breaker such that the two layers
of steel used in the frame and front cover construction are between the test personnel and the vacuum
interrupters, and that the test personnel be no closer
than one meter (4') from the front of the circuit
breaker. THE CIRCUIT BREAKER SHALL BE
EITHER FULLY OPEN, OR FULLY CLOSED WHEN
MAKING HIGH POTENTIAL TESTS. DO NOT TEST
WITH CONTACTS PARTIALLY OPEN.
B. SPECIFIC
1. DO NOT WORK ON AN ENERGIZED CIRCUIT
BREAKER. If work must be performed on a
circuit breaker, remove it from service and
remove it from the metal-clad switchgear.
2. DO NOT WORK ON A CIRCUIT BREAKER
WITH THE CONTROL CIRCUIT ENERGIZED.
D. SAFETY LABELS
3. EXTREME CARE MUST BE EXERCISED TO
KEEP ALL PERSONNEL, TOOLS, AND OTHER
OBJECTS CLEAR OF MECHANISMS WHICH
ARE TO BE OPERATED, DISCHARGED, OR
RELEASED. These circuit breakers utilize
stored-energy mechanisms. These mechanisms
must be serviced only by skilled and knowledgeable personnel capable of releasing each spring
load in a controlled manner. Detailed information
regarding these mechanisms is found in this
instruction bulletin.
The equipment described in this document has
DANGER, WARNING, CAUTION, and instruction
labels attached to various locations. All equipment
DANGER, WARNING, CAUTION, and instruction
labels shall be observed when the medium-voltage
controller is handled, operated, or maintained.
!
CAUTION
WARNING AND CAUTION LABELS ARE
LOCATED IN VARIOUS PLACES IN AND ON
THE SWITCHGEAR AND ON THE CIRCUIT
BREAKER REMOVABLE ELEMENT. ALWAYS
OBSERVE THESE WARNINGS AND CAUTION
LABELS. DO NOT REMOVE OR DEFACE
THESE WARNING AND CAUTION LABELS.
4. Do not attempt to close the circuit breaker
manually on an energized circuit.
5. DO NOT USE AN OPEN CIRCUIT BREAKER
AS THE SOLE MEANS OF ISOLATING A HIGH
VOLTAGE CIRCUIT. For complete isolation, the
circuit breaker shall be in the disconnected
position or shall be withdrawn completely.
IB-50060
7
IB-50060
III. DESCRIPTION
A. GENERAL
The entire assembly fits into a metal-clad switchgear
compartment designated for a ITE/ABB circuit
breaker without modification to that compartment. All
interlocking provided on the ITE/ABB circuit breaker
is also provided on the ITE HK circuit breaker.
The Type ITE HK PowlVac® circuit breaker, (Figure 1)
is a special version of the Powl-Vac® Vacuum Circuit
Breaker. It is designed to replace a ITE/ABB circuit
breaker of equivalent rating in metal-clad switchgear.
a
b
f
c
g
h
d
e
i
Figure 1. Front View of PowlVac® Type ITE HK Circuit Breaker with the Front Cover Installed
a.
b.
c.
d.
e.
Front Cover Attachment Bolts
Handle
Manual Charging Crank
Operations Counter
Spring Charged/Discharged Indicator
f.
g.
h.
i.
8
Nameplate
Manual Trip Operator
Breaker Open/Closed Indicator
Manual Close Operator
B. THE STORED ENERGY MECHANISM
IB-50060
the main closing spring. As the camshaft rotates, the
connecting rods pull the spring compression plate
downward, compressing the closing spring.
The unit’s front cover (Figure 1) has cutouts and
apertures giving access to various operating functions.
The ratchet wheel will drive the camshaft so that the
connecting rods go down to their lowest position and
then start to move upward. At a certain point, the
spring force will overcome friction and resistance and
start to rotate the camshaft. At the same time, the
pawls are uncoupled from the ratchet wheel and the
motor cutoff switch is operated. The motor cutoff
switch located on the right of the mechanism is
operated by the spring charge flag falling into the
spring charge cam. The spring charge flag will now
show that the mechanism is charged. The camshaft
would continue to rotate, except that it is restrained
by the close latch arm engaging against the close
latch shaft (Figure 2, t). The main operating cam
located between the mechanism side sheets is now
in a position where the main drive linkage can move
to the reset position (Figure 7, a).
Removal of the front cover bolts enable it to be
removed giving access to the stored energy mechanism and its interlocks, auxiliary switches, levering-in
interlocks, charging motor and motor cutoff switch
(Figure 2, j).
The mechanism is of the stored energy type in which
a gear motor is used to compress a closing spring.
During a closing operation, the energy stored in the
closing spring is used to close the vacuum interrupter
contacts, compress the overtravel springs, charge the
opening springs and overcome friction forces. When
the breaker is tripped, the energy stored in the
opening and overtravel springs will open the contacts
at the correct speed. The motor, located on the
breaker floor pan bottom, is supported by a bracket
bolted to the floor pan (Figure 2, l). The motor output
shaft is screwed to a coupler which inserts into the
eccentric drive shaft. This shaft is supported in
needle bearings in the mechanism frame side sheets
and transmits the motor torque from the right to the
left side of the mechanism.
When the close latch is released, either under the
action of the closing solenoid or the manual close
plate, the closing spring pulls the camshaft around,
and the main closing cam moves the main linkage
into the closed position. The main linkage rotates the
center lever of the drive jackshaft. The jackshaft has
3 downward-pointing pairs of levers to which are
attached to the operating rods. The operating rods,
which are approximately horizontal, are moved
towards the vacuum interrupter by the rotation of the
jackshaft (Figure 2, g).
When the motor is energized, the eccentric drive
shaft rotates and causes the driving arm links to pivot
around the camshaft (Figure 2, o). The drive pawl
located on the links engages with the ratchet wheel
and rotates it, one tooth at a time. The ratchet wheel
is prevented from rotating backward by a holding
pawl, which is supported on links which project
upward from the camshaft.
At the end of the operating rods remote from the
jackshaft levers is a recess which encloses the
contact loading springs. At the end of these springs,
remote from the operating rod, is located the spring
yoke which connects with the bell crank levers. The
spring yoke is restrained by a lock nut on a stud
which, passing through the contact loading spring, is
attached to the operating rod. The contact loading
spring has initial compression such that as soon as
the vacuum interrupter contacts touch, they are
loaded by a force sufficient to resist their separation
under the highest electromagnetic forces exerted by
the rated short circuit current.
To insure correct synchronization of the drive and
hold pawls, the hold pawl links are located by an
adjustable eccentric stop located at the left front of
the mechanism. When the mechanism is operated
manually, the top pawl becomes the driving pawl and
the bottom pawl becomes the holding pawl.
As the ratchet wheel is rotated, projections from its
side faces will engage drive plates attached to the
camshaft and the camshaft will rotate. Attached to
the ends of the camshaft are crank arms and pointing
outward from these are crank pins. These engage
with the bottom ends of the connecting rods (Figure
2, e) the top ends of which engage pins projecting
from the spring compression plate which straddles
Further movement of the operating rods continue to
compress the contact loading spring and produce a
gap between the face of the spring yoke and the lock
nut. This gap will decrease as the vacuum interrupter
contacts erode.
9
IB-50060
a
g
f
e
b
h
c
i
j k
l
d
m
n
q
x
p
ad
o
ac
ab
y
aa
w
r
s
v
z
u
t
Figure 2. Front View of Type ITE HK Circuit Breaker with Cover Removed
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
Anti-Pump Relay
Shock Absorber (Dashpot)
Primary Shunt Trip Solenoid
Auxiliary Switch
Connecting Rod
Main Closing Spring
Jackshaft
Motor Cutoff Cam
Close Bar Adjusting Screw
Motor Cutoff Switch
k.
l.
m.
n.
o.
p.
q.
r.
s.
t.
Charging Motor Drive Shaft
Charging Motor
Secondary Trip Prop
Main Cam Roller
Camshaft
Main Closing Cam
Reset Spring
Ratchet Wheel
Close Latch Arm
Close Latch Shaft
10
u.
v.
w.
x.
y.
z.
aa.
ab.
ac.
ad.
Pawl Support Arm
Drive Pawl
Pawl Lift Plate
Secondary Trip Prop Adjusting Screw
Holding Pawl Adjusting Eccentric
Closing Solenoid
Crank Arm
Crank Pin
Holding Pawl Support Arm
Latch Check Switch
IB-50060
The bell crank levers, which are located on the
outside of the lower primary conductors, are supported on a hinge pin bridging the conductors and are
connected to a drive pin, which bridges the bell
cranks and engages an extension to the vacuum
interrupter moving stem. The bell cranks give an
approximate 3 to 1 multiplication of the contact
loading spring force which permits reduced spring
force and enables a low rate spring to be used. They
also multiply the contact movement of approximately
0.38 inches by a factor of 3 so that the mechanism
linkages have relatively large movements and are
less critical.
trip shaft is rotated by the action of the manual trip
plate or the electric trip solenoid, the secondary trip
prop moves down and permits the primary trip prop to
move upward, thus permitting the main linkage to
move upward and the jackshaft to rotate, opening the
breaker. The jackshaft extends from the left to the
right side of the breaker frame and is supported at the
main breaker frame side sheets and by the mechanism side sheets. The two outer operating rod levers
on the jackshaft have connections to the breaker
opening springs. A projection of the left lever engages a shock absorber which controls the rebound
of the interrupter contacts on opening operations.
In the linkage position shown in Figure 7b and 7d, the
contact loading springs and the main opening springs
are both acting to compress the three (3) main
mechanism links (Figure 8).
With the standard electrical control scheme, as soon
as the closing springs are discharged on a closing
operation, the motor is switched on to recharge the
springs. This leaves the main closing cam in a
position where the tripped linkage can reset under the
action of the reset spring (Figure 8, f) and the primary
and secondary trip props can fall into the reset
position. The reset spring stretches between an
extension of the main cam roller pin and a spring
support pin located on the left mechanism side sheet.
The latch check switch (Figure 2, ad) operated by a
lever on the trip shaft will now close.
The linkage is restrained from movement by the
secondary trip prop acting on the primary trip prop
roller. A component of force tends to make the
primary trip prop move upward, but it is restrained by
the secondary trip prop face acting on the primary trip
prop roller. The clearance between the primary trip
prop roller and the secondary trip prop is controlled
by the primary trip prop adjusting screw. When the
(THIS SPACE IS BLANK INTENTIONALLY.)
11
IB-50060
Figure 3. Left Side View with the
Barrier Removed
a
a.
b.
c.
d.
e.
f.
c
d
Mechanism Housing
Racking Mechanism
Primary Disconnect Device
Lower Primary Conductor
Secondary Disconnect
Ground Connection
b
e
f
Figure 4. Right Side View with the
Barrier Removed
a.
b.
c.
a
b
c
12
Vacuum Interrupter
Main Insulating Operating Arm (Push Rod)
Mechanism Operated Cell (MOC) Switch Operator
Figure 5. Left Side View with Cover Installed
Figure 6. Right Side View with Cover Installed
13
IB-50060
IB-50060
7 b.
7 a.
7 c.
7 d.
Figure 7. Cam and Fundamental Linkage Positions
Figure 8. Mechanical and Trip Linkages
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
k.
l.
m.
14
Secondary Trip Prop Shaft
Secondary Trip Prop
Secondary Linkage Roller
Main Cam Roller
Reset Spring
Camshaft
Main Closing Cam
Center Phase Operating Lever
Jackshaft
Primary Trip Prop Roller
Primary Trip Prop Adjusting Screw
Primary Trip Prop
IB-50060
C. SAFETY INTERLOCKS AND PROVISIONS
1) Position Interlocks
Position interlocks are often supplied in conjunction
with removable elements such as circuit breakers,
disconnecting switches, and special compartments
where access is denied unless the removable element is withdrawn to the TEST position.
The ITE HK circuit breaker is provided with safety
interlocks which operate in conjunction with components in the switchgear compartment. The interlocks
are designed to control the insertion of the circuit
breaker into the compartment.
b
DO NOT attempt to modify or bypass safety interlocks which are designed to lock the circuit breaker in
one of three positions within the switchgear compartment: DISCONNECTED, TEST, and CONNECTED.
c
d
2) Circuit Breaker Compartment Safety
Provisions
a
The switchgear compartment is provided with a
positive mechanical interlock, which is designed to
deter moving a circuit breaker, except when the
primary contacts are open. It also deters closing the
primary contacts while the circuit breaker is being
moved, by blocking the operating mechanism mechanically and electrically.
Figure 9. Switchgear Compartment
a.
b.
c.
d.
a. Racking Mechanism
Floor Trip
Secondary Disconnect
Ground Connection
Interference Plate
The circuit breaker rating should be checked against
the metal-clad switchgear rating. Under no circumstances shall the breaker compartment interference
plate be removed. Removing this plate allows an
incorrect type of rating circuit breaker to be inserted
into the compartment. For safety and since the
interference plate does not coordinate control wiring,
ALWAYS REFER TO WORK ORDER INFORMATION, DRAWINGS, AND SCHEMES TO MAKE
CERTAIN THAT THE CIRCUIT BREAKER AND
METAL-CLAD SWITCHGEAR ARE COORDINATED
FOR OPERATION.
Safety shutters open and close over the stationary
primary disconnects devices in response to the
movement of the circuit breaker racking mechanism.
A racking unlocking lever is provided to discharge the
main closing spring when a circuit breaker is withdrawn from the compartment. The racking unlocking
lever is activated by moving the “trip flag” weldment
to the side to insert the racking handle. The interlock
is also activated by the compartment floor trip assembly.
NOTE: In the BBC instruction bulletin IB 8.2.7.4.J.
on page 5, the“trip flag weldment” is referred to as
the “unlocking lever.”
DISCONNECT is the first position on the circuit
breaker racking shaft. When the circuit breaker is in
DISCONNECT position it is prevented from being
removed from the compartment without pulling the
racking mechanism trip lever.
A breaker compartment interference plate
(Figure 9, d) is provided, which is designed to hinder
the insertion of an incorrect type or rating circuit
breaker into the compartment.
A floor trip assembly is located on the front, bottom of
the circuit breaker frame. The action of depressing
the floor trip causes a link inside the circuit breaker to
trip the breaker. The floor trip is used to assure a
closed breaker is not racked in.
15
IB-50060
3) Circuit Breaker Racking Mechanism
a) Disconnected Position
The circuit breaker racking mechanism (Figure 10, b)
enables moving the circuit breaker to one of three
positions in the secondary compartment of the
switchgear: DISCONNECTED, TEST, and CONNECTED.
A glastic shutter covers the openings of the stationary
primary disconnect devices which prevents contact.
In this position, the secondary disconnect devices
and control contacts are disengaged.
b) Test Position
The racking unlocking lever (Figure 10, a) is located
on the front, lower right side of the circuit breaker
housing. The racking unlocking lever is a springcontrolled lever that works in conjunction with the
racking drive shaft. The purpose of the racking
unlocking lever is to allow the circuit breaker to be
closed in one of three positions in the compartment:
DISCONNECTED, TEST, and CONNECTED. The
racking unlocking lever prevents a closed circuit
breaker from being racked into or out of a compartment.
In the TEST position, the primary disconnect devices
are disengaged and the shutters are closed. The
secondary devices are completed so the breaker may
be electrically or manually operated.
c) Connected Position
In the CONNECTED position, the movable primary
disconnects and stationary primary disconnects are
engaged, the shutters are open, and the secondary
devices and control contacts are completed.
The racking arm of the racking unlocking lever can be
manually operated to quickly disconnect the circuit
breaker. When the racking arm lever is pushed to the
left, the racking unlocking lever operates a link in the
mechanism that trips the circuit breaker.
Interlocks deter the movement of a circuit breaker
from one position to another, unless the circuit
breaker is tripped open. The interlocks also deter
closing the circuit breaker between positions.
4) Mechanism-Operated Cell (MOC) Switch
The mechanism-operated cell switch (MOC) is an
auxiliary switch operated by linkages in the compartment, which operates in conjunction with the circuit
breaker mechanism.
The MOC switch actuator assembly is connected to
the jackshaft using linkages. The MOC switch
actuator is located at the lower left side of the circuit
breaker. Before installing the circuit breaker, check
the assembly to assure it has not been damaged
during shipment and is tight. The assembly should
have enough freedom to slide freely and smoothly
when operated. After racking the circuit breaker in
and before closing, check the position of the MOC
actuator in relation to the MOC operating rod, which
is attached to the compartment. The rod should be
in the slot of the MOC actuator. Adjustments to the
MOC auxiliary switch are made in the compartment.
a
b
5) TOC (Truck-Operated Contact) Actuator
The TOC actuator is a pin welded to the circuit
breaker frame. The TOC operates the auxiliary
switch on the right side of the compartment when
the circuit breaker is racked in. All adjustments to
the TOC are made on the compartment linkage.
Figure 10. Circuit Breaker Interior with
Cover Removed
a.
b.
Racking Unlocking Lever
Racking Mechanism
16
D. VACUUM INTERRUPTER CONNECTIONS
IB-50060
IV. INSTALLATION
Connection to the vacuum interrupter stems is made
by means of copper contact blocks. The fixed stem
of the vacuum interrupter is threaded and a copper
contact block is screwed onto this stem. The
contact block is assembled to the primary disconnecting devices of the circuit breaker. Another
copper contact block is clamped to the bottom or
moving stem of the vacuum interrupter. The sliding
contact finger assembly makes contact with this
block and the lower primary disconnecting devices.
The multiple parallel paths of the sliding contact
finger assembly keeps the current density low.
A. RECEIVING
When the circuit breaker is received, check for signs
of damage. If damage is found or suspected, file
claims as soon as possible with the transportation
company, and notify the nearest representative of
Powell Electrical Manufacturing Company.
B. HANDLING
The circuit breaker is equipped with four wheels so
that it may be rolled easily on level floors.
E. OPERATING SOLENOIDS
C. STORAGE
The closing solenoid, located under the middle of
the mechanism, is attached to the breaker floor pan
by two screws accessible from underneath the
breaker (Figure 2, z).
It is recommended that the circuit breaker be put into
service immediately in its permanent location. If this
is not possible, the following precautions must be
taken to assure the proper storage of the circuit
breaker:
The primary shunt trip solenoid is to the left of the
mechanism and is supported from the lower frame
channel (Figure 2, c).
1. Since dampness has an adverse effect on the
insulating parts, the breaker should be carefully
protected against condensation, preferably by
storing it in a warm, dry room of moderate
temperature, such as 40°-100°F. Circuit breakers
for outdoor metal-clad switchgear should be
stored in the equipment only when power is
available and the heaters are in operation to
prevent condensation.
Either a second shunt trip solenoid or an undervoltage trip device may be furnished as an option.
When furnished, either of these devices is located to
the right of the mechanism and is supported from
the lower frame channel. Only one of these two
auxiliary trip devices may be furnished on any one
circuit breaker, as both types are located in the
same space.
2. The breaker should be stored in a clean location,
free from corrosive gases or fumes. Particular
care should be taken to protect the equipment
from moisture and cement dust, as this combination has a very corrosive effect on many parts.
F. THE ANTI-PUMP RELAY
The anti-pump relay is located on the breaker frame
to the left of the left connecting rod and is held by
two screws (Figure 2, a).
3. Unplated surfaces of the operating mechanism,
such as rollers and latches, should be coated
with grease to prevent rusting.
G. MOTOR CUTOFF SWITCH
The motor cutoff switch, which is located at the right
of the mechanism, is attached to a bracket which is
bolted to the circuit breaker floor pan (Figure 2, j).
If the breaker is stored for any length of time, it
should be inspected periodically to see that rusting
has not started and to insure it is in good mechanical
condition. If the breaker is stored under unfavorable
atmospheric conditions, it should be cleaned and
dried out before being placed into service.
H. VACUUM INTERRUPTERS
For a listing of the vacuum interrupters used in Type
ITE HK circuit breakers, see Table E. A label that
shows the part number is attached to each vacuum
interrupter. Replacement vacuum interrupters must
have the same part number as the original vacuum
interrupter.
17
IB-50060
D. PLACING THE CIRCUIT BREAKER INTO
SERVICE
!
Before shipment from our factory, all circuit breaker
functions are thoroughly checked. The user must
verify functions after receipt. Powell Electrical
Manufacturing Company recommends that the tests
be performed in the sequence listed below:
CAUTION
IF DC HIGH POTENTIAL TESTING IS
PERFORMED, THE DC HIGH POTENTIAL TEST
MACHINE MUST NOT PRODUCE
INSTANTANEOUS PEAK VOLTAGES
EXCEEDING 50kV.
1. High Voltage Insulation Integrity
2. Vacuum Integrity
!
3. Control Voltage Insulation Integrity
AFTER THE HIGH POTENTIAL IS REMOVED,
AN ELECTRICAL CHARGE MAY BE RETAINED
BY THE VACUUM INTERRUPTERS. FAILURE
TO DISCHARGE THIS RESIDUAL
ELECTROSTATIC CHARGE COULD RESULT IN
AN ELECTRICAL SHOCK. ALL SIX PRIMARY
DISCONNECTING DEVICES OF THE CIRCUIT
BREAKER AND THE METALLIC MID-BAND
RING, IF PRESENT, SHOULD BE GROUNDED
AND REMAIN GROUNDED FOR AT LEAST
ONE MINUTE TO REDUCE THIS ELECTRICAL
CHARGE BEFORE COMING INTO CONTACT
WITH THE PRIMARY CIRCUIT.
4. Mechanical Operation Check
5. Electrical Operation Check
!
WARNING
CAUTION
HIGH VOLTAGES ACROSS THE OPEN GAPS
OF THE VACUUM INTERRUPTER CAN
PRODUCE X-RADIATION. WHEN
CONDUCTING HIGH VOLTAGE TESTS,
PERSONNEL SHOULD STAND AT LEAST ONE
METER (4') AWAY FROM THE CIRCUIT
BREAKER WITH THE COVERS IN PLACE.
TEST VOLTAGES SHOULD NOT EXCEED 27
kVAC (50 kV DC) FOR CIRCUIT BREAKER
WITH A RATED MAXIMUM VOLTAGE OF
15.0 kV.
!
CAUTION
REMOVE ALL GROUNDING CONDUCTORS
APPLIED FOR FIELD DIELECTIC TEST
BEFORE PLACING THE CIRCUIT BREAKER
BACK INTO SERVICE.
1) High Voltage Insulation Integrity
The primary circuit insulation on the circuit breaker
may be checked phase-to-phase and phase-toground using a 2500V insulation resistance tester.
Since definite limits cannot be given for satisfactory
insulation values when testing with an insulation
resistance tester, a record should be kept of the
insulation resistance tester readings as well as the
temperature and humidity readings. This record
should be used to detect any weakening of the
insulation system from one check period to the next.
The circuit breaker insulation should be tested with
the circuit breaker vacuum interrupter contacts in the
CLOSED position. Test each pole of the circuit
breaker separately, with the other 2 poles and the
frame grounded. Perform the field dielectric test
described in ANSI Standard C37.20.2, at the voltage
level appropriate for the equipment. (See Table A.)
This test will have checked all of the primary phaseto-ground and phase-to-phase insulation.
To check insulation integrity, the AC high potential
test described below is strongly recommended.
Using DC testing is not the preferred method; however, values are provided due to the availability of DC
test sets.
Table A. Field Dielectric Test Values
18
Rated Maximum
Voltage
(kV rms)
Power Frequency
Withstand
(kV rms)
15.0
27
Powell recognizes the widespread use of DC hipot
equipment in the field and the desire to use this
equipment to verify vacuum integrity. However, the
capacitive component of the vacuum interrupter
during DC testing may yield false negative test
results, which are often misinterpreted as vacuum
interrupter failure. When DC testing is performed, a
test set providing a full wave rectified 50kV DC hipot
voltage can be applied for 5 seconds as a “go - no
go” test.
The tests described above are the only tests required
to ascertain insulation integrity. Because of the
design of the Powl-Vac ® insulation system, no valid
data can be obtained utilizing other types of highvoltage insulation tests.
!
IB-50060
CAUTION
APPLYING ABNORMALLY HIGH VOLTAGE
ACROSS A PAIR OF CONTACTS IN THE
VACUUM, MAY PRODUCE X-RADIATION. THE
RADIATION MAY INCREASE WITH INCREASED VOLTAGE AND/OR DECREASED
CONTACT SPACING.
Recording the leakage readings is not necessary, as
a dielectric breakdown will trip all portable DC hipot
test sets. If a DC test breakdown occurs, the test
must be repeated after reversing the DC high voltage
test supply connection across the vacuum interrupter.
The working condition of a vacuum interrupter should
be questioned only if it has failed both tests.
THE X-RADIATION, PRODUCED DURING THIS
TEST WITH THE VOLTAGE SPECIFIED IN
TABLE A AND NORMAL CONTACT SPACING,
IS EXTREMELY LOW AND WELL BELOW THE
MAXIMUM PERMITTED BY STANDARDS.
!
CAUTION
WHEN TESTING WITH DC, USE A DC HIGH
POTENTIAL TEST (HIPOT) SET WITH FULL
WAVE RECTIFICATION. MANY DC HIGH
POTENTIAL TEST SETS USE HALF-WAVE
RECTIFICATION. DO NOT USE THESE HALFWAVE RECTIFIERS. THE CAPACITANCE OF
THE VACUUM INTERRUPTER IN COMBINATION WITH THE LEAKAGE CURRENTS IN THE
RECTIFIERS AND ITS DC VOLTAGE MEASURING EQUIPMENT, MAY RESULT IN APPLYING
PEAK VOLTAGES AS MUCH AS THREE TIMES
THE MEASURED VOLTAGE. THESE ABNORMALLY HIGH VOLTAGES MAY GIVE A FALSE
INDICATION OF A DEFECTIVE VACUUM
INTERRUPTER, AND MAY PRODUCE ABNORMAL X-RADIATION.
DO NOT APPLY VOLTAGE THAT IS HIGHER
THAN THE RECOMMENDED VALUE. DO NOT
USE CONTACT SEPARATION THAT IS LESS
THAN THE NORMAL OPEN POSITION SEPARATION OF THE CIRCUIT BREAKER CONTACTS.
2) Vacuum Integrity
Powell recommends AC testing for reliable verification of vacuum integrity. All Powl-Vac® 15kV circuit
breakers shall be tested with a minimum of 25kV AC
applied across fully open contacts for 10 seconds.
No dielectric breakdown during the test period
constitutes a successful test.
Note, this test does not replace the AC high potential
testing (Hipot) used to determine “High voltage insulation integrity.” For more details, see Section IV. INSTALLATION, D. PLACING THE CIRCUIT BREAKER INTO
SERVICE, 1) High Voltage Insulation Integrity.
!
CAUTION
IF DC HIGH POTENTIAL TESTING (HIPOT) IS
REQUIRED, THE DC HIGH POTENTIAL TEST
MACHINE MUST NOT PRODUCE
INSTANTANEOUS PEAK VOLTAGES
EXCEEDING 50kV.
Powell offers a compact and lightweight Powl-Vac®
Vacuum Integrity Tester designed specifically for
Powl-Vac® circuit breakers. If this device is used,
refer to the instruction bulletin provided with the
vacuum integrity tester.
19
No attempt should be made to try to compare the
condition of one vacuum interrupter with another, nor
to correlate the condition of any vacuum interrupter
with low values of DC leakage current. There is no
significant correlation.
charge flag indicates that the close spring is now
charged. This requires about 60 operations of the
handle. Remove the handle. Push the round PUSH
TO CLOSE paddle and the breaker will close. The
flag located about the PUSH TO CLOSE paddle will
now read CLOSED. Push the red trip paddle located
at the top of the escutcheon and the breaker will open
as indicated by the breaker condition flag.
3) Control Voltage Insulation Integrity
If the user wishes to check the insulation integrity of
the control circuit, it may be done with a 500-volt or
1000-volt insulation resistance tester or with an AC
high potential tester. The AC high potential test
should be made at 1125 volts, 50 or 60 Hz for one
minute. The charging motor must be disconnected
prior to testing the control circuit. The charging motor
itself may be similarly tested at a voltage not to
exceed 675 volts, 50 or 60 Hz. Be sure to remove
any test jumpers and reconnect the charging motor
after the tests are complete.
!
IB-50060
5) Electrical Operation Check
To check the electrical operation of the breaker, use
the jumper cable (test coupler) furnished with the
original switchgear. Remove the control fuses in the
compartment. Connect the jumper cable to the
secondary disconnect plug in the compartment and to
the circuit breaker. Insert the fuses. The motor
mechanism automatically charges the stored energy
closing springs. Operate the closing switch on the
front door of the compartment to close the circuit
breaker. The circuitry is normally arranged to cause
the motor to operate again and charge the closing
spring. Operate the electrical trip switch on the front
door to open the circuit breaker. An alternate method
to perform these functions is to connect the circuit
breaker to a test cabinet.
CAUTION
REMOVE ALL GROUNDING CONDUCTORS
APPLIED FOR THIS TEST BEFORE PLACING
THE CIRCUIT BREAKER BACK INTO
SERVICE.
E. INSERTING THE CIRCUIT BREAKER INTO
THE SWITCHGEAR EQUIPMENT
Refer to the instruction book provided with the
original switchgear equipment for instructions covering insertion of the circuit breaker into the switchgear
equipment.
4) Mechanical Operation Check
To check the mechanical operation of the circuit
breaker, insert the manual charge handle into the
manual charge crank (Figure 1, c) and push down
until a metallic click is heard. This indicates that the
holding pawl has dropped into place on the ratchet
wheel. Lift the lever until it is horizontal and then
depress. The procedure is repeated until the spring
20
V.
The need for scheduled inspection and maintenance
depends on equipment application conditions such as
the number of operations, magnitude of currents
switched, desired overall system reliability, and the
operating environment. Any time the circuit breaker
is known to have interrupted a fault current at or near
its rating, it is recommended that the circuit breaker
be inspected and the necessary maintenance be
performed as soon as practical. Inspection and
maintenance may be required at more frequent
intervals in some atmospheric conditions such as
extremes of dust, moisture, or corrosive gases.
MAINTENANCE
NOTE: Contact Powell Apparatus Service Division for assistance in performing maintenance or
setting up a maintenance program. Visit the Web
site at www.powellservice.com, or telephone
1-800-480-7273.
!
CAUTION
PRIOR TO BEGINNING ANY MAINTENANCE
PROCEDURES, MAKE CERTAIN THAT THE
CONTROL CIRCUITS ARE DE-ENERGIZED
AND THE CIRCUIT BREAKER IS RESTING
SECURELY OUTSIDE THE CIRCUIT BREAKER
COMPARTMENT. DO NOT WORK ON A
CLOSED CIRCUIT BREAKER OR A CIRCUIT
BREAKER WITH THE MAIN CLOSING SPRING
CHARGED.
!
IB-50060
Very clean and dry conditions combined with low
switching duty will justify longer times between
inspection and maintenance operations. An inspection and maintenance schedule can be developed by
the user according to the service requirements and
conditions of the specific circuit breaker.
If maintenance is performed at longer time intervals
than one year, the vacuum integrity test should be
performed each time the circuit breaker is removed
from the metal-clad switchgear for reasons other than
scheduled circuit breaker maintenance.
IMPORTANT
A permanent record of all maintenance work should
be kept, the degree of detail depends upon the
operating conditions. The record will be a valuable
reference for subsequent maintenance work and for
station operation. It is also recommended that the
record include reports of tests performed, the condition of circuit breakers, and any repairs or adjustments that were performed. This record should begin
with tests performed at the time of installation and
energizing, and all data should be graphed as a
function of time to ensure a proper maintenance cycle
is scheduled.
BEFORE ATTEMPTING ANY MAINTENANCE
WORK, IT IS IMPORTANT TO STUDY AND
FULLY UNDERSTAND THE SAFETY
PRACTICES OUTLINED IN SECTION II OF THIS
INSTRUCTION BULLETIN. IF THERE IS
REASON TO BELIEVE THERE ARE ANY
DISCREPANCIES IN THE DESCRIPTIONS
CONTAINED IN THIS INSTRUCTION
BULLETIN, OR IF THEY ARE DEEMED TO BE
CONFUSING AND/OR NOT FULLY
UNDERSTOOD, CONTACT POWELL
ELECTRICAL MANUFACTURING COMPANY
IMMEDIATELY.
Because of extensive quality control tests made at
the factory, the operations counter on a new circuit
breaker will normally register over a hundred operations. The reading of the operations counter should
be recorded when the circuit breaker is placed into
service and when any maintenance work is performed.
A. GENERAL DESCRIPTION
1) Introduction
A regular maintenance schedule must be established
to obtain the best service and reliability from the
circuit breaker. Powl-Vac® circuit breakers are
designed to comply with industry standards requiring
maintenance every 1000 or 2000 operations depending upon the rating of the circuit breaker, or once a
year.
21
!
IB-50060
Primary insulation, including the vacuum interrupter
supports and the operating rods, should be cleaned.
Wipe the insulation clean with a dry, lint-free cloth or
an industrial type wiper. If dirt adheres and cannot be
removed by wiping, remove it with distilled water or a
mild solvent such as denatured alcohol. Be sure that
the circuit breaker is dry before returning it to service.
Do not use any type of detergent to wash the surface
of the insulators because detergent may leave an
electrically conducting residue on the surface as it
dries.
CAUTION
WHEN ANY MAINTENANCE PROCEDURES
REQUIRE OPENING OR CLOSING OF THE
CIRCUIT BREAKER OR CHARGING OF ANY
OF THE MECHANISM SPRINGS, EXERCISE
EXTREME CARE TO MAKE SURE ALL
PERSONNEL, TOOLS AND OTHER OBJECTS
ARE KEPT WELL AWAY FROM ALL MOVING
PARTS OR CHARGED SPRINGS.
B. MECHANISM AREA
1) Mechanical Operation
!
Remove the circuit breaker front cover to expose the
stored-energy mechanism. Make a careful visual
inspection of the mechanism for loose, damaged, or
excessively worn parts.
CAUTION
WHEN CLEANING THE CIRCUIT BREAKER
INSULATING SUPPORTS AND BUS
INSULATION, USE ONLY DENATURED
ALCOHOL OR ISOPROPYL ALCOHOL TO
REMOVE FOREIGN MATERIAL. FAILURE TO
DO SO MAY DAMAGE THE DIELECTRIC AND/
OR THE MECHANICAL PROPERTIES OF THE
INSULATION.
Note, if timing tests are performed as in, Section V.
MAINTENANCE, D. OPTIONAL MAINTENANCE
PROCEDURES, do not operate the circuit breaker
until these tests are completed. Operation of the
mechanism may alter the “As found” operating
condition of the circuit breaker’s stored-energy
mechanism.
For further details, see Section IV. INSTALLATION, D.
PLACING THE CIRCUIT BREAKER INTO SERVICE,
4) Mechanical Operation Check.
2) Inspection and Cleaning
Visually check the circuit breaker for loose or damaged parts. Tighten or replace loose or missing
hardware. Any damaged parts that will interfere with
the normal operation of the circuit breaker should be
replaced. The inspection will be easier if the front
cover and interphase barrier assembly are removed.
Clean the circuit breaker by removing any loose dust
and dirt. Do not use compressed air to clean dirt
from the circuit breaker. This may result in blowing
loose dirt or grit into bearings or other critical parts,
thus causing excessive wear on these parts. To
clean the circuit breaker, remove dirt with a vacuum
cleaner, or wipe dirt away with a dry, lint-free cloth or
an industrial-type wiper. Do not use solvents, degreasers, or any aerosol products to clean in the area
of any mechanisms. Refer to Section V. MAINTENANCE, B. MECHANISM AREA, 2) Lubrication, for
instructions on cleaning the lubricated areas for the
stored energy mechanism and other specified parts.
22
2) Lubrication
!
IB-50060
Powell offers a complete lubrication kit (Powlube-102)
which contains all the lubricants required for maintaining the circuit breakers. Powlube-102 contains
Rheolube 368A grease, Anderol 456 oil, and
Mobilgrease 28.
CAUTION
BEFORE APPLYING ANY TYPE OF
LUBRICATION TO THE CIRCUIT BREAKER,
THE STORED-ENERGY MECHANISM SHOULD
BE IN THE OPEN POSITION, AND ALL
SPRINGS SHOULD BE DISCHARGED.
Rheolube 368A grease should be lightly applied to
those bearing surfaces that are accessible. Inaccessible surfaces, such as bearings, may be lubricated
with a light synthetic machine oil such as Anderol 456
oil. Mobilgrease 28 should be applied to the electrical
contact surfaces.
(THIS AREA IS BLANK INTENTIONALLY.)
23
IB-50060
Table B. Lubrication
Location
Ref.
Figure
Lubricant
Method
Electrical Parts
Primary Disconnecting Fig. 11 [a]
Device
Mobilgrease 28
Wipe clean. Apply lubricant only to the actual contact surface.
Secondary Disconnect Fig. 11 [J]
Mobilgrease 28
Ground Connection
Fig. 11 [u]
Mobilgrease 28
(Note: It may be easier to lubricate the Secondary Disconnect
Receptacle in the compartment (see Figure 9, b)
Contact Block
Fig. 12 [r]
Mobilgrease 28
Spring Yoke Pin
Fig. 11 [b]
Anderol 456 Oil
Trip Shaft Bearing
Fig. 11 [c]
Anderol 456 Oil
Jackshaft Support
Fig. 11 [d]
Anderol 456 Oil
Pawl Support Arm
Fig. 11 [e]
Anderol 456 Oil
Crank Pin
Fig. 11 [f]
Anderol 456 Oil
Motor Drive Shaft
Roller Needle
Bearings
Pawls
Fig. 11 [g]
Anderol 456 Oil
Fig. 11 [h]
Anderol 456 Oil
Ratchet Wheel
Fig. 11 [i]
Fundamental Linkage
Pi n
Jackshaft Lever Pins
passing through
Operating Pushrods
Close Latch Shaft
Face
Main Closing Spring
Guide Rod
Primary Trip Prop
Fig. 11 [k]
Rheolube 368A
Grease
Anderol 456 Oil
Apply oil to penetrate where pin passes through end link.
Fig. 11 [l]
Anderol 456 Oil
Avoid lubricant on operating pushrods.
Fig. 11 [m]
Apply a light coating of grease, and remove all excess grease.
Fig. 12 [n]
Rheolube 368A
Grease
Anderol 456 Oil
Fig. 12 [o]
Anderol 456 Oil
Flag Support Pin
Fig. 12 [p]
Anderol 456 Oil
Mechanical Parts
Open-Close Flag Drive Fig. 12
Lever Pin at Jackshaft
Jackshaft Outer
F i g. 12
Bearings Support
Motor Drive
F i g. 12
Shaft Coupling
Motor Drive Shaft Fig. 12
Support Bearings
Camshaft Needle
F i g. 12
Bearings
Close Shaft Support Fig. 12
Bearing
Motor Cutoff Cam Fig. 12
[q]
Anderol 456 Oil
[s]
Anderol 456 Oil
[t]
Anderol 456 Oil
[v]
Anderol 456 Oil
[w]
Anderol 456 Oil
[x]
Anderol 456 Oil
[y]
Rheolube 368A
Grease
Anderol 456 Oil
Fundamental Linkage Fig. 12 [z]
Apply grease to the peripheral surface only.
Apply oil to penetrate where pins pass through links.
24
IB-50060
a
j
b
a. Primary
Disconnecting
Device
(Rear View)
c
k
d
e
l
f
m
g
b. Spring
Yoke Pin
c. Trip Shaft
Bearing
h
i
Figure 11. Lubrication
d. Jackshaft
Support
e. Pawl Support Arm
f. Crank Pin
g. Motor Drive
Shaft Roller
Needle Bearings
h. Pawls
l. Jackshaft
Lever Pin
m. Close Latch Shaft
Face
j. Secondary
Disconnect
i. Rachet Wheel
j. Secondary
Disconnect
k. Fundamental
Linkage Pin
25
IB-50060
r
n
o
p
z
q
y
x
s
u
(Rear View)
n. Main Closing
Spring Guide Rod
t
w
o. Primary Trip
Prop
v
p. Flag Support
Pin
Figure 12. Lubrication
q. Open-Closed Flag
Drive Lever Pin at
Jackshaft
r. Contact
Block
v. Motor Drive Shaft
Support Bearings
w. Camshaft Needle
Bearings
s. Jackshaft Outer
Bearings Support
x. Close Shaft
Support Bearing
26
t. Motor Drive Shaft
Coupling
y. Motor Cutoff
Cam
u. Ground
Connection
z. Fundamental
Linkage
IB-50060
Lubricate the stored-energy mechanism and other
specified parts in accordance with Table B. Lubrication. See Figures 11 and 12 for labeled lubrication
photographs.
c
Table B lists the location of all surfaces that should be
lubricated, the type of lubricant to be used, and the
method of applying the lubricant. The guiding rule in
lubrication is to lubricate regularly, use lubricant
sparingly and remove all excess lubricant. There is
no need to disassemble the mechanism for lubrication. Tilting the circuit breaker will enable the lubricant to cover the bearing surfaces.
b
a
3) Closing Spring Removal and Slow Closing
of the Breaker Mechanism
d
e
Figure 13. Main Closing Spring
Assembly Compressed for Removal
The closing spring must be removed in order to
perform slow closing of mechanism.
a.
b.
c.
a. Closing Spring Removal
Bracket
Flat Washer
Bolt
d.
e.
Spacer
Connecting Rod
c
Disassembly of the stored-energy mechanism is not
required for routine lubrication; however, for major
overhaul removal of the main closing spring it is
necessary. Removal of the spring permits slow
closing of the mechanism and the vacuum interrupter
contacts. The procedure for spring removal is as
follows:
d
e
b
a
1. With the main closing spring discharged and the
circuit breaker contacts open, remove the circuit
breaker top cover.
2. Remove the bolt at the top of the spring rod
together with the flat washer, and lock washer.
Figure 14. Main Closing Spring
Assembly Installed
3. Remove the horizontal bracket at the top of the
main closing spring, by unfastening the two
attachment bolts.
a.
b.
c.
d.
e.
4. Remove the spacer(s) from below the bracket.
5. Turn the bracket 90°, and replace it on top of the
spring yoke.
Spacer
Flat Washer
Bolt
Bracket
Lock Washer
6. Place the spacer(s) on top of the bracket with the
flat washer above it.
7. Insert the bolt and tighten it until the tension is
taken off the connecting rods.
9. To install the main closing spring assembly
reverse the preceding removal procedure.
8. With a slight rocking motion of the main closing
spring assembly, the connecting rods (Figure 13,
e) can now be unhooked from the spring yoke
pins and the main closing spring assembly can
be removed.
NOTE: Care should be taken on reassembly to
ensure correct location of the flat washer, lock
washer and spacer. (See Figure 14.)
27
IB-50060
5. Rotate the latch check switch upwards until the
contacts are closed. An audible “click” of the
contacts will be heard.
b. Slow Closing of Mechanism
The slow closing of mechanism is not required for
routine maintenance; however, it may be a useful
procedure for troubleshooting circuit breaker
misoperation.
6. At the position where the “click” is heard, hold the
switch and retighten the two screws which secure
the latch check switch.
1. With the main closing spring assembly removed,
rotate the camshaft so that the crank arms are
pointing downward. The fundamental linkage will
now move into the reset position.
7. Remove the gauge.
8. To confirm that the latch check switch is properly
set, slowly depress and release the manual trip
operator to verify that the latch check switch
opens and closes properly. An audible “click” of
the contacts will be heard. The latch check switch
contacts open as the latch check operator is
moved by the manual trip operator away from the
secondary trip prop adjusting screw.
2. Push the manual close operator inward and hold
it in while operating the manual charging handle
to rotate the camshaft.
3. When the close release latch arm is past the
close shaft, release the manual close operator.
The main closing cam engages the main cam
roller, and the jackshaft rotates.
9. Slowly withdraw the manual trip operator and the
latch check switch contacts will close as the latch
check operator is a maximum of 0.045-inches
away form the secondary trip prop adjusting
screw.
4. Continue to operate the manual charging handle
until the crank arms point upward. The circuit
breaker will now be closed and there will be a
gap between the operating pushrod lock nuts and
the contact spring yokes.
10. Depress the manual close operator and rotate the
crank arm until resistance is felt.
5. Depress the manual trip operator to return the
circuit breaker to the open position.
11. Depress and hold the manual trip operator inward
and rotate the crank arms until the spring charge
indicator displays, CLOSING SPRING DISCHARGED.
4) Latch Check Switch Adjustment
The latch check switch adjustment is not required for
routine maintenance; however, the latch check switch
may need to be adjusted after major overhaul or
removal of the mechanism. (See Figure 15.)
12. Reinstall the main closing spring.
The latch check switch adjustment is as
follows:
1. Remove the main closing spring as
described in this section.
2. Rotate the crank arms until the spring
charge indicator displays, CLOSING
SPRING CHARGED.
3. Loosen the two screws which secure the
latch check switch and rotate the latch
check switch around the pivot screw
downward to the lowest position allowed.
The latch check switch contacts are now
open.
Figure 15. Latch Check Switch Adjustment
a.
b.
c.
4. Insert a 0.045-inch gauge between the
secondary trip prop adjusting screw and
latch check operator.
28
Latch Check Switch
Latch Check Operator
!
WARNING
WHEN ANY MAINTENANCE PROCEDURE
REQUIRES THE OPENING OR CLOSING
OF THE CIRCUIT BREAKER OR THE
CHARGING OF ANY OF THE STOREDENERGY MECHANISM SPRINGS, EXERCISE
EXTREME CAUTION TO MAKE SURE THAT
ALL PERSONNEL, TOOLS, AND OTHER
OBJECTS ARE KEPT AT A SAFE DISTANCE
FROM THE MOVING PARTS OF THE
CHARGING SPRINGS. FAILURE TO DO THIS
MAY CAUSE SERIOUS DAMAGE TO THE
CIRCUIT BREAKER AND/OR INJURY TO
PERSONNEL.
a
Figure 17. Primary Trip Prop Adjusting Screw
a.
Primary Trip Prop Adjusting Screw
a. Ratchet Wheel Holding Pawl Adjustment
The holding pawl support arm (Figure 2, ac) is
adjusted by the holding pawl adjusting eccentric
(Figure 2, y). If the pawl is not properly adjusted,
there will be a “knocking” noise when the ratchet
mechanism is operating or the stored-energy mechanism will not ratchet at all.
5) Mechanism Adjustments
!
IB-50060
CAUTION
1. To adjust the pawl, remove the escutcheon to
gain access to the head of the bolt holding the
adjusting eccentric.
DO NOT ADJUST THESE SETTINGS
UNNECESSARILY BECAUSE DAMAGE
TO THE CIRCUIT BREAKER MAY OCCUR.
2. Loosen the bolt slightly.
Several factory adjustments in the stored-energy
mechanism are described below. NO ADJUSTMENT
OF THESE SETTINGS IS REQUIRED FOR ROUTINE MAINTENANCE, but adjustments may be
needed after a major overhaul or removal of the
mechanism. (See Figure 16 and Figure 17.)
3. Grip the eccentric with a pair of slip-joint pliers or
a similar tool and rotate the stop slightly.
4. Tighten the holding bolt with the eccentric in the
new position.
5. While charging the main closing spring and using
the charging motor to drive the mechanism,
observe the ratcheting operation for improvement.
NOTE: If the ratcheting operation has not
improved, repeat the preceding sequence until
the ratcheting operation is smooth. This may
require several charging cycles.
6. When the eccentric is properly set replace the
escutcheon. Be sure that the escutcheon is
reinstalled on the proper circuit breaker, since the
escutcheon contains the nameplate with the
circuit breaker’s rating and serial number information. The serial number of the circuit breaker
is also attached to the circuit breaker frame near
the ground connection on a stamped metal plate.
The serial number found on the nameplate must
match the number affixed to the frame.
Figure 16. Primary and Secondary
Trip Prop Adjustment
a.
b.
c.
Secondary Trip Prop
Primary Trip Prop Roller
Primary Trip Prop
d.
e.
f.
Primary Trip Prop
Adjusting Screw
Rivet
Trip Bar
29
b. Secondary Trip Prop Adjustment
IB-50060
d. Mechanism Operated Control (MOC)
Actuator Adjustment
Adjust the secondary trip prop adjusting screw
(Figure 16, d) so that the secondary trip prop top
edge is in the line of sight with the top of the rivet of
the primary trip prop roller as shown in Figure 16, b.
The MOC adjustment is made in the compartment.
Adjust the MOC to ensure the circuit breaker can be
racked in without interfering with the MOC operating
rod. Refer to the instruction book provided with the
original switchgear equipment for instructions covering MOC switch adjustment procedures.
c. Close Latch Shaft Adjustment
The close latch shaft (Figure 2, t) passes through the
side sheets of the stored-energy mechanism frame at
the front of and below the camshaft. The left end of
the shaft is shaped to make a latch face and interferes with the close latch arm (Figure 2, s), which is
fixed to the camshaft. The other end of the close
latch shaft is on the right side of the mechanism and
a small lever attached to it is positioned by a close
bar adjusting screw (Figure 2, i).
e. Truck-Operated Contact (TOC) Actuator
Adjustment
The TOC, located in the side of the switchgear is
operated by circuit breaker truck position. TOC
adjustment is made in the switchgear compartment.
f.
Floor Trip Adjustment
A floor trip lever is located on the front, bottom of the
circuit breaker frame. The trip link in the circuit
breaker mechanism area can be adjusted to ensure
the breaker trips when the floor trip is depressed. To
adjust the trip link, remove the front cover from the
circuit breaker. Loosen the jam nut at the bottom end
of the trip link, and rotate the link as required.
Tighten the jam nut, replace the front cover on the
circuit breaker, and check the adjustment and function by pushing the breaker into the compartment.
The breaker must trip when the adjustment is correct.
To adjust the close latch shaft perform the following
steps:
1. Remove the escutcheon.
2. Loosen the locking nut from the close bar adjusting screw while holding the position of the close
bar adjusting screw with a screw driver.
3. Back out the close bar adjusting screw by turning
the screw counterclockwise 2 full turns.
4. Manually charge the circuit breaker main closing
spring with a manual charging handle until the
spring charge indicator displays, CLOSING
SPRING CHARGED.
6) Electrical Operation
After performing any necessary mechanical and
lubrication maintenance, operate the circuit breaker
electrically several times to ensure that the electrical
control system works properly. For instructions, see
Section IV. INSTALLATION, D. PLACING INTO
SERVICE, 5) Electrical Operation Check of this
instruction bulletin.
5. Turn the close bar adjusting screw clockwise until
the main closing spring discharges, then depress
the manual trip operator to open the circuit
breaker.
6. Turn the close bar adjusting screw 3-1/2 full turns
counterclockwise. Retighten the locking nut
holding the screw.
C. VACUUM INTERRUPTER AND CONTACT AREA
1) Vacuum Interrupter and Contact Erosion
7. Repeat step 5. Close and open the circuit
breaker to ensure proper operation.
At each inspection the vacuum interrupters should be
checked for contact erosion. The circuit breaker must
be closed for this check. Each new vacuum interrupter is set with a gap of about 1/4" to 5/8" between
the contact loading spring yoke and the lock nut on
the operating pushrod stud. As the contacts erode
with use, this gap will decrease. Because the factory
setting of the lock nut gap varies for each vacuum
interrupter, a label is provided on the lower part of
each vacuum interrupter. The original factory setting
of the gap and the end-of-life measurement of this
8. Replace the escutcheon.
30
gap is recorded on the label. When the gap measurement reaches the end-of-life value given on this label,
the vacuum interrupter should be replaced.
IB-50060
OR REPLACEMENT OF THE VACUUM INTERRUPTER. DO NOT ADJUST THESE SETTINGS
UNNECESSARY AS DAMAGE TO THE CIRCUIT
BREAKER MAY RESULT. When it is necessary to
remove or replace the vacuum interrupter, please
contact Powell Apparatus Service Division.
2) Sliding Contact Finger Wear
To clean, inspect, and lubricate the sliding contact
finger assemblies, remove the four socket-head
screws holding the sliding contact finger assemblies
and pivot the assemblies down. Wipe the lubrication
from the surfaces of the lower contact block, sliding
contact fingers, and the lower primary conductors and
examine the surfaces. The sliding contact finger
locations should present a burnished silver contact
without copper appearance at more than one location. If the copper is visible at more than one location
per pole or the silver is worn on the lower contact
block, the vacuum interrupter assembly should be
replaced.
D. OPTIONAL MAINTENANCE PROCEDURES
1) High Potential Tests
High potential tests are not required for routine
maintenance but are recommended after a heavy
fault interruption, any major circuit breaker repair that
involves the primary current path or when the circuit
breaker has been in storage for an extended time,
especially in a damp location or other adverse
environment. In these cases, both the High Voltage
Insulation Integrity and Control Voltage Insulation
Integrity tests should be performed. For details of
maintenance procedures, see section IV. INSTALLATION, D. PLACING THE CIRCUIT BREAKER INTO
SERVICE.
The sliding contact finger assemblies on the
PowlVac® circuit breakers are reversible. Since only
the upper ends of the fingers experience any wiping
action, the wear is normally confined to that end. If
the upper ends of the fingers show noticeable wear,
the finger assemblies can be reversed. Loosen the
bolt holding the rear-mounting clip and remove the
finger assembly. Invert the assembly and replace it in
the mounting clips. Tighten the bolt holding the rearmounting clip. If copper is visible at more than one
contact location on a finger assembly, that assembly
should be replaced. Apply a light coat of Mobilgrease
28 contact lubricant to both sides of the contact
blocks and to the contact areas of the lower primary
disconnecting devices, then reassemble the sliding
contact finger assemblies by replacing the four
socket-head screws and tighten to a torque value of
8-12 ft.-lbs.
2) Timing
Perform CLOSE and OPEN timing tests at the
nominal control voltage. The voltage is printed on the
circuit breaker nameplate.
To measure CLOSE timing, operate the test source
to the CLOSE position. When the circuit breaker
closes, record the closing time. The closing time
from energizing the closing coil to vacuum interrupter
contact touch should not exceed the values in Table
C. Timing.
To measure OPEN timing, operate the test source to
the OPEN position. When the circuit breaker opens,
record the closing time. Operate the test source to
the OPEN position to open the circuit breaker and
record the opening time. The opening time from
energizing the shunt trip coil to vacuum interrupter
contact part should not exceed the values listed in
Table C. Timing.
3) Vacuum Integrity
Refer to the Section IV. INSTALLATION, D. PLACING
THE CIRCUIT BREAKER INTO SERVICE for information on vacuum integrity and testing of vacuum
interrupters.
4) Mechanical Adjustment of Vacuum Interrupters
Table C. Timing
There are no adjustments required for routine maintenance of a vacuum interrupter assembly. There are
several factory adjustments which will vary over the
operating life of the vacuum interrupter. ADJUSTMENTS OF THESE SETTINGS IS ONLY NECESSARY WHEN REPAIR REQUIRES THE REMOVAL
31
Closing Time
Tripping Time
3 cycles
< 80 ms
< 35 ms
5 cycles
< 80 ms
< 55 ms
3) Primary Resistance Check
3. Specify the quantity and description of the part
and the instruction bulletin number. If the part is
in any of the recommended renewal parts tables,
specify the catalog number. If the part is not in
any of the tables, a description should be accompanied by a marked illustration from this instruction bulletin, a photo, or submit a sketch showing
the part needed.
The primary resistance check is not required for
routine maintenance but it is recommended after any
major maintenance that requires disassembly of any
part of the primary current path.
To check the primary resistance, pass a minimum of
100A DC through the circuit breaker pole, with the
circuit breaker closed. Measure the voltage drop
across the primary contacts and calculate the resistance. The resistance should not exceed the values
provided in this instruction bulletin for the specific
type and rating of the circuit breaker being measured.
B. RECOMMENDED RENEWAL PARTS
A sufficient amount of renewal parts should be stored
to enable the prompt replacement of any worn,
broken or damaged part. A sufficient amount of
stocked parts minimizes service interruptions caused
by breakdowns and saves time and expense. When
continuous operation is a primary consideration, a
larger quantity of renewal parts should be stocked
depending on the severity of the service and the time
required to secure replacement parts.
The micro-ohm values of resistance must not exceed
the limits in Table D.
Table D. Primary Resistance
Breaker Type
Rated
kV
Rated Continuos
Current A
Resistance
Micro-ohms
15PV25HKX-21
15
1200
100
15PV25HKX-22
15
2000
100
15PV36HKX-21
15
1200
80
15PV36HKX-22
15
2000
80
IB-50060
Since parts may be improved periodically, renewal
parts may not be identical to the original parts.
However, spare and replacement parts will be interchangeable with the original parts. Tables E, F, and
G, list the recommended spare parts to be carried in
stock by the user. The recommended quantity is not
specified. This must be determined by the user
based on the application. As a minimum, it is recommended that one set of parts be stocked per ten
circuit breakers or less.
VI. RECOMMENDED RENEWAL
PARTS AND REPAIR
PROCEDURES
Powell Electrical Manufacturing Company recommends that only qualified technicians perform maintenance on these units. If these circuit breakers are
installed in a location where they are not maintained
by a qualified technician, a spare circuit breaker
should be on site ready for circuit breaker replacement. The malfunctioning unit can then be returned
to the factory for reconditioning.
A. ORDERING INSTRUCTIONS
1. To order Renewal Parts from Powell Apparatus
Service Division (PASD), visit the Web site at
www.powellservice.com or call 1-800-4807273.
2. Always specify the complete nameplate information, including:
• Circuit Breaker Type
• Serial Number
• Rated Voltage
• Rated Amps
• Impulse Withstand
• Control Voltage (for control devices and coils)
32
IB-50060
Table E. Interrupter Assemblies
B r e a k e r Ty p e
R a te d
kV
R a te d
C o n tin u o s
C u rren t A
R a te d S h o rt
C irc u it
In te rru p tin g , k A
In te rru p te r
As e m b lie s
1 5 P V 2 5 HK X 3 -2 1
15
1200
25
6 1 7 0 0 G0 3 P
1 5 P V 2 5 HK X 3 -2 2
15
2000
25
6 1 7 0 0 G2 2 P
1 5 P V 3 6 HK X 3 -2 1
15
1200
36
6 1 7 0 0 G2 1 P
1 5 P V 3 6 HK X 3 -2 2
15
2000
36
6 1 7 0 0 G1 4 P
d
b
f
a
e
c
Figure 18. Control Devices
a.
b.
c.
d.
e.
f.
Secondary Shunt Trip Coil Assembly
Primary Shunt Trip Coil Assembly (3 cycle)
Closing Coil Assembly
33
Charging Motor Assembly
Anti-Pump Relay Assembly
Undervoltage Device Assembly
IB-50060
Table F. Control Devices
C ontrol
Voltage
C losing
C oil
Assembly
Primary
Shunt Trip
C oil
Assembly
3 cycle (2)
Primary
Shunt Trip
C oil
Assembly
5 cycle
Secondary
Shunt Trip
C oil
Assembly
(1, 3)
U ndervoltage
D evice
Assembly
(1, 4)
C harging
Motor
Assembly
Anti-Pump
R elay
Assembly (5)
24V dc
N/A
50027G05P
50041G05P
50042G06P
50028G04P
N/A
N/A
48V dc
50026G01P
50027G01P
50041G01P
50042G01P
50028G03P
50960G06P
RR2BA-USD C 48V
125V dc
50026G03P
50027G02P
50041G02P
50042G03P
50028G01P
50960G04P
RR2BA-USD C 110V
250V dc
50026G04P
50027G03P
50041G03P
50042G04P
50028G02P
50960G05P
RR2BA-USD C 110V
120Vac
50026G01P
50027G01P
50041G01P
50042G01P
N/A
50960G04P
RR2BA-USA C 120V
240Vac
50026G02P
50027G06P
50041G06P
50042G02P
N/A
50960G05P
RR2BA-USA C 240V
C apaci tor
Tri p (6)
N/A
50027G04P
50041G04P
50042G05P
N/A
N/A
N/A
Notes for Table F: The numbers in parenthesis ( ) refer to the following list.
1. One item is required per circuit breaker if the circuit breaker was originally equipped with this item. All
circuit breakers have a closing coil, primary shunt trip coil, charging motor, and an anti-pump relay assembly. Secondary shunt trip coils assemblies are optional. See notes 2-7.
2. The part is to be used only in special applications. This part is not interchangeable with a 5-cycle trip coil.
3. The Secondary shunt trip coil cannot be furnished with an undervoltage device assembly.
4. Where furnished, this part cannot be present with the secondary shunt trip coil assembly. Consult Powell
Electrical Manufacturing Company for replacement undervoltage device part numbers.
5. For 250V DC applications, a dropping resistor 50747G02P is required in a series with the anti-pump relay
assembly.
6. The part is for use with the capacitor trip units with 240V AC input. Consult the Powell Electrical Manufacturing Company for other circuit breaker ratings.
7. All control devices are available with push-on terminals. Consult the Powell Electrical Manufacturing
Company for control devices with screw terminals.
34
IB-50060
Table G. Miscellaneous Parts
Description
Auxiliary Switch
Push-on Terminals
Screw Terminals
Catalog No.
102108LN
102108LP
102109LP
Latch Check Switch
BA-2RV2-A2
Motor Cutoff Switch Assembly
77034G01P
PowlVac® Hardware Kit
60500G24
PowlVac® Lubrication Kit
Powlube-102
35
Illustration
IB-50060
C. REPLACEMENT PROCEDURES
2) Primary Shunt Trip Coil Assembly
This section includes instructions for replacing the
parts recommended as renewal parts. Before attempting any maintenance repair work, take note of
the safety practices outlined in Section II. SAFETY of
this instruction bulletin.
The primary shunt trip coil assembly is located at the
top left side of the mechanism (Figure 2, c and Figure
18, b) just left of the main closing spring. Perform
the following steps to replace the primary shunt trip
coil assembly:
MAKE CERTAIN THAT THE CONTROL CIRCUITS
ARE DE-ENERGIZED AND THE CIRCUIT
BREAKER IS RESTING SECURELY OUTSIDE
THE METAL-CLAD UNIT. DO NOT START TO
WORK ON A CLOSED CIRCUIT BREAKER OR A
CIRCUIT BREAKER WITH THE MAIN CLOSING
SPRING CHARGED. WHEN ANY MAINTENANCE
PROCEDURE REQUIRES THE OPENING OR
CLOSING OF THE CIRCUIT BREAKER OR THE
CHARGING OF ANY OF THE STORED-ENERGY
MECHANISM SPRINGS, EXERCISE EXTREME
CAUTION TO MAKE SURE THAT ALL PERSONNEL, TOOLS, AND OTHER OBJECTS ARE KEPT
WELL AWAY FROM OF THE MOVING PARTS OR
THE CHARGED SPRINGS.
1. Remove the front cover of circuit breaker.
2. Disconnect the primary shunt trip coil assembly
wiring from the wiring harness. Measure and
record the distance between the assembly
armature and the trip lever.
3. Remove the two bolts which hold the assembly to
the circuit breaker frame and remove the assembly.
4. Bolt the new assembly in place and reconnect it
to the wiring harness.
5. With the circuit breaker mechanism in the reset
position, adjust the gap between the assembly
armature and the trip lever to the dimension
measured and recorded from step 2. To achieve
this setting bend the trip lever slightly.
1) Closing Coil Assembly
The closing coil assembly is located in the center and
beneath the circuit breaker mechanism ( Figure 2, z
and Figure 18, c). Perform the following steps to
replace the closing coil assembly:
6. Trip the circuit breaker electrically several times
to ensure that the primary shunt trip coil assembly is functioning properly.
1. Remove the front cover of the circuit breaker.
7. Replace the front cover.
2. Disconnect the closing coil assembly from the
wire harness.
3) Charging Motor Assembly
3. Remove the two bolts which hold the assembly to
the base pan, and drop the assembly out of the
bottom of the circuit breaker.
The charging motor assembly is located at the bottom
right of the floor pan of the mechanism (Figure 2, l
and Figure 18, d). Perform the following steps to
replace the charging motor assembly:
4. Insert the new assembly into the circuit breaker
from below and bolt it in place. Reconnect the
assembly to the wiring harness. No adjustment is
required.
5. Close the circuit breaker several times electrically
to ensure that the closing coil assembly is functioning properly.
3. Remove the two bolts which hold the charging
motor mounting bracket to the base pan and slide
the motor to the right.
4. Disconnect the charging motor drive shaft from
the mechanism’s eccentric drive shaft.
2. Disconnect the charging motor assembly from the
wiring harness.
5. Remove the charging motor from the circuit
breaker.
6. Lubricate the end of the shaft of the new charging
motor liberally with Rheolube 368A grease.
36
7. Position the new assembly in the circuit breaker.
Verify that the pin on the end of the charging
motor drive shaft engages the slot in the mechanism eccentric drive shaft.
IB-50060
5) Latch Check Switch Assembly
The latch check switch is located at the left side of
the main mechanism frame (Figure 2, ad and Table
G), near the bottom of the main closing spring. To
replace and adjust the latch check switch, see
Section V. MAINTENANCE, B. MECHANISM AREA,
3) Closing Spring Removal and Slow Closing of the
Breaker Mechanism. In addition to those instructions,
perform the following steps to replace the latch check
switch assembly:
8. Bolt the assembly to the base pan and reconnect
it to the wiring harness.
9. Operate the circuit breaker several times to
ensure that the charging motor assembly operates smoothly.
1. Remove the two screws that secure the latch
check switch to the mechanism. Do not lose the
nut plate into which these screws are threaded.
4) Anti-Pump Relay Assembly
The anti-pump relay assembly is located inside the
left side sheet of the circuit breaker frame, near the
top of the mechanism (Figure 2, a and Figure 18, e).
Perform the following steps to replace the anti-pump
relay assembly:
2. Disconnect the wires from the switch.
3. Reconnect the wires to the new switch and fasten
the switch in place with the screws and the nut
plate which was previously removed.
4. Adjust the latch check switch according to
Section V. MAINTENANCE, B. MECHANISM
AREA, 3) Closing Spring Removal and Slow
Closing of the Breaker Mechanism.
2. Loosen the lower mounting screw of the relay.
3. Remove the upper mounting screw and lift the
relay off the lower screw.
5. Operate the circuit breaker electrically several
times to ensure that the latch check switch is
working.
4. Disconnect the leads from the anti-pump relay
assembly, being careful to identify each wire by
the terminal number from which it was removed.
6) Motor Cutoff Switch Assembly
5. Reconnect all wires to the proper terminals of the
relay.
The motor cutoff switch assembly is located at the
bottom right of the base pan of the mechanism
(Figure 2, j and Table G), just to the right of the main
mechanism. Perform the following steps to replace
the motor cutoff switch assembly:
6. Place the new assembly over the lower screw,
and reinstall the upper screw, then tighten both
screws.
7. Relays that are in 250V DC closing circuits are
provided with voltage dropping resistors. The
resistor is mounted adjacent to the relay. It may
be replaced by disconnecting the resistor from
the relay, unscrewing the mounting feet from the
frame of the circuit breaker, then replacing the
resistor. Reassemble the new resistor back to
the original location.
2. Remove the two bolts that hold the assembly to
the floor pan and remove the assembly.
3. Disconnect the wires from the motor cutoff switch
assembly, being careful to identify each wire by
the terminal number from which it was removed.
4. Install the new assembly and bolt it to the base
pan.
8. Operate the circuit breaker several times to
ensure the anti-pump relay assembly functions
properly.
times to ensure that all components on the motor
cutoff switch assembly are working properly.
37
7) Auxiliary Switch Assembly
The auxiliary switch is located at the bottom left of
the base pan of the mechanism area (Figure 2, d and
Table G). Perform the following steps to replace an
auxiliary switch:
2. Disconnect the wires from the auxiliary switch,
being careful to identify each wire by the terminal
number from which it was removed.
3. Remove the “E” ring securing the switch operating arm to the operations counter linkage.
4. Remove the two screws holding the switch to its
mounting bracket, and remove the switch. Note
the orientation of the switch terminals prior to
removing the switch.
5. Insert the new switch and attach it to the mounting bracket with the two screws removed in step
4. Be certain to orient the switch as noted in step
4.
6. Insert the operating arm of the switch into the
hole in the end of the operations counter linkage
and secure with the “E” ring removed in step 3.
7. Reconnect the wiring. Be sure that the wires are
connected to the same terminal numbers from
which they were removed.
times to ensure that the auxiliary switch is
working.
38
IB-50060
IB-50060
INDEX
A
Anti-pump rely
S
J
17
Jackshaft
9
B
L
Bell crank levers 11
Breaker closed 15
Breaker open 15
Latch check switch
Lubrication
locations 27
C
M
Camshaft 9
Circuit breaker
description 8
interlocks 16
Circuit Breaker Compartment
Safety Provisions 15
Cleaning 22
Closing solenoid 17
Closing spring 9
Closing spring removal 27
Connecting rods 9
D
Dielectric test 18
Drive pawl 9
Drive plates 9
E
Eccentric drive shaft 9
Electrical Operation
test coupler 20
Electrical operation 30
Electromagnetic 9
H
High potential tests 31
High voltage insulation integrity
Hipot 19
Holding pawl 9
I
Inspection 22
Inspection and cleaning 22
Installation 17
Instruction bulletins 6
Insulation 18
Insulation resistance 18
Interlock switch assembly 38
37
Maintenance
conditions 21
maintenance schedule 21
operations 21
operations counter 21
record 21
schedule 21
Mechanism Adjustments
ratchet wheel holding pawl 29
Motor
output shaft 9
Motor cutoff switch 9, 17
Motor cutoff switch assembly 37
Safety 6
general 7
mechanism 9
specific 7
Safety labels 7
Scope 6
Secondary trip prop 11
Service requirements 21
Shunt trip solenoid 17
Slow closing 28
Special compartments 15
Spring compression plate 9
Storage 17
Stored energy mechanism 9
Synchronization 9
T
Timing tests
31
U
Undervoltage trip
17
V
O
Opening springs 9
Overtravel springs 9
P
Parts 32
Powell Apparatus Service Division
6, 21
Primary resistance 32
Primary trip prop 11
Purpose 6
Vacuum integrity 19
Vacuum interrupter 9, 17
Vacuum interrupters
contact area 30
mechanical adjustment 31
sliding contact finger wear 31
W
Web site
X
X-rays
R
Racking unlocking lever 16
Ratchet wheel 9
Ratchet wheel holding pawl 29
Receiving 17
Record 21
Renewal parts 32
Reset spring 11
39
6
7
IB-50060
INSTRUCTIONS
POWLVAC® TYPE 15KV ITE HK REPLACEMENT
VACUUM CIRCUIT BREAKER
POWELL ELECTRICAL MANUFACTURING COMPANY
8550 MOSLEY DRIVE • HOUSTON, TEXAS 77075 • USA
PHONE (713) 944-6900 • FAX (713) 947-4453
http://www.powellelectric.com
http://www.powellservice.com
©2001 POWELL ELECTRICAL MANUFACTURING COMPANY
ALL RIGHTS RESERVED
12/2004

IB-50060 PowlVac Type ITE HK 15kV

Transcription

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