Instructions
IB-50030B
PowlVac Type PVDH
Replacement Vacuum Circuit Breaker
®
Replacement for Westinghouse Type DH Air-Magnetic Circuit Breakers
Installation
Maintenance
Renewal Parts
POWELL ELECTRICAL MANUFACTURING COMPANY
8550 MOSLEY DRIVE · HOUSTON, TEXAS 77075 USA
PHONE (713) 944-6900 · FAX (713) 947-4453
www.powellelectric.com
www.powellservice.com
©2001 POWELL ELECTRICAL MANUFACTURING CO.
All Rights Reserved.
IB-50030B
PowlVac® Type PVDH Circuit Breaker
WARNING
THIS EQUIPMENT MAY CONTAIN HIGH VOLTAGES AND CURRENTS
WHICH CAN CAUSE SERIOUS INJURY OR DEATH.
IT IS DESIGNED FOR USE, INSTALLATION, AND MAINTENANCE BY
KNOWLEDGABLE USERS OF SUCH EQUIPMENT HAVING EXPERIENCE
AND TRAINING IN THE FIELD OF HIGH VOLTAGE ELECTRICITY. THIS
DOCUMENT, AND ALL OTHER DOCUMENTATION, SHOULD BE FULLY
READ AND UNDERSTOOD AND ALL WARNINGS AND CAUTIONS ABIDED
BY. IF THERE ARE ANY DISCREPANCIES OR QUESTIONS, THE USER
SHOULD CONTACT POWELL ELECTRICAL MANUFACTURING COMPANY
IMMEDIATELY AT 1-800-480-7273.
CAUTION
Before any adjustments, 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 AND THE CIRCUIT
BREAKER CLOSING SPRING MUST BE DISCHARGED.
2
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
PowlVac® Type PVDH Circuit Breaker
IB-50030B
Table of Contents
1
I.
INTRODUCTION ............................................................................................................................................... 5
A. SCOPE ...................................................................................................................................................... 5
B. PURPOSE .................................................................................................................................................. 5
C. CONFLICT WITH OTHER DOCUMENTS ............................................................................................... 5
D. OTHER ITEMS OF CAUTION .................................................................................................................. 5
E. INSTRUCTION BULLETINS ON THE WEB ............................................................................................. 6
II. SAFETY ............................................................................................................................................................. 6
A. GENERAL ................................................................................................................................................. 6
B. SPECIFIC .................................................................................................................................................. 7
C. X-RAYS .................................................................................................................................................... 7
D. SAFETY LABELS ..................................................................................................................................... 8
III. DESCRIPTION ................................................................................................................................................... 9
A. GENERAL ................................................................................................................................................ 9
B. THE STORED ENERGY MECHANISM .................................................................................................... 9
C. ROLLOUT TRUCK ................................................................................................................................... 11
D. SECONDARY CONTACTS ....................................................................................................................... 11
E. GROUND CONTACT ................................................................................................................................ 11
F. LEVERING-IN DEVICE .............................................................................................................................. 11
G. SHUTTER ROLLERS ................................................................................................................................ 15
H. MOC ACTUATOR .................................................................................................................................... 16
I. INTERLOCKING ....................................................................................................................................... 16
1. Levering-in Interlock ........................................................................................................................ 16
2. Cell Interlocks .................................................................................................................................. 17
J. OPERATING SOLENOIDS ........................................................................................................................ 17
K. MOTOR CUTOFF SWITCH ..................................................................................................................... 17
L. VACUUM INTERRUPTERS ...................................................................................................................... 17
M. CONTROL CIRCUIT ................................................................................................................................. 17
N. ANTI-PUMP RELAY ................................................................................................................................ 18
IV. INSTALLATION ................................................................................................................................................ 20
A. RECEIVING ............................................................................................................................................... 20
B. HANDLING .............................................................................................................................................. 20
C. STORAGE ................................................................................................................................................. 20
D. PUTTING INTO SERVICE ......................................................................................................................... 22
1. Commissioning ................................................................................................................................ 22
2. High Voltage Insulation Integrity ..................................................................................................... 22
3. Vacuum Integrity .............................................................................................................................. 22
4. Control Voltage Insulation Integrity ................................................................................................ 23
5. Mechanical Operation Check ........................................................................................................... 23
6. Electrical Operation Check ............................................................................................................... 23
7. Dimensional Check .......................................................................................................................... 23
E. INSERTING CIRCUIT BREAKER INTO SWITCHGEAR EQUIPMENT ...................................................... 24
V. MAINTENANCE ............................................................................................................................................... 26
A. GENERAL ................................................................................................................................................. 26
1. Introduction ..................................................................................................................................... 26
2. Inspection and Cleaning .................................................................................................................. 27
B. MECHANISM AREA ................................................................................................................................. 27
1. Mechanical Operation ..................................................................................................................... 27
2. Lubrication ....................................................................................................................................... 27
3. Closing Spring Removal and Slow Closing of Mechanism .............................................................. 28
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
3
IB-50030B
PowlVac® Type PVDH Circuit Breaker
Table of Contents
4.
Mechanism Adjustments ................................................................................................................. 29
a. Adjustment of Ratchet Wheel Holding Pawl .......................................................................... 29
b. Adjustment of Primary and Secondary Trip Latches and Latch Check Switch ....................... 29
c. Adjustment of Close Latch ..................................................................................................... 29
5. Electrical Operation ........................................................................................................................... 29
C. VACUUM INTERRUPTER AND CONTACT AREA ................................................................................ 33
1. Vacuum Interrupter Contact Erosion ................................................................................................ 33
2. Sliding Contact Finger Wear ............................................................................................................ 33
3. Vacuum Integrity .............................................................................................................................. 33
D. OPTIONAL MAINTENANCE PROCEDURES .......................................................................................... 34
1. High Potential Tests ........................................................................................................................ 34
2. Primary Resistance Check ................................................................................................................ 34
VI. RECOMMENDED RENEWAL PARTS AND REPAIR PROCEDURES ............................................................... 35
A. ORDERING INSTRUCTIONS ................................................................................................................... 35
B. RECOMMENDED RENEWAL PARTS ...................................................................................................... 35
C. REPLACEMENT PROCEDURES .............................................................................................................. 39
VII. ANNEX .............................................................................................................................................................. 43
A. COMMISSIONING FOR REPLACEMENT CIRCUIT BREAKERS ............................................................ 43
Illustrations
1
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 12.
Exterior Components .................................................................................................................... 12
Cam and Fundamental Linkage Positions .................................................................................... 13
Mechanism and Trip Linkages ..................................................................................................... 13
Interior Components .................................................................................................................... 14
Levering-in Device and Interlock ................................................................................................. 15
Cell Interlocks .............................................................................................................................. 16
Typical DC Control Scheme ......................................................................................................... 18
Operation Sequence ..................................................................................................................... 19
Main Closing Spring Assembly Compressed for Removal ........................................................ 28
Main Closing Spring Assembly Installed .................................................................................... 28
Primary Trip Latch Adjusting Screw ............................................................................................ 29
Lubrication ................................................................................................................................... 31
Lubrication ................................................................................................................................... 32
Tables
1
Table I.
Table II.
Table III.
Table IV.
Table IV.
Table V.
4
Lubrication ................................................................................................................................... 30
Vacuum Interrupter and Sliding Contact Finger Assemblies ........................................................ 36
Control Devices ........................................................................................................................... 36
Miscellaneous Parts ..................................................................................................................... 37
Miscellaneous Parts ..................................................................................................................... 38
Trouble Shooting Topics ............................................................................................................. 45
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
PowlVac® Type PVDH Circuit Breaker
IB-50030B
These instructions do not purport to cover all details or variations of the circuit breakers nor to
provide for every possible contingency or hazard to be met in connection with installation, testing,
operation and maintenance. Should further information be desired or should particular problems
arise which are not covered sufficiently for the user’s purposes, the matter should be referred to
Powell Electrical Manufacturing Company or call 1-800-480-7273.
I.
INTRODUCTION
A. SCOPE
This instruction bulletin describes the following PowlVac® Type PVDH Vacuum Circuit Breakers:
Type 15PV25DH (500MVA), 15PV36DH (750MVA), 15PV50DH (1000MVA)
B. PURPOSE
This instruction bulletin provides:
1.
2.
3.
4.
5.
6.
7.
Guidelines for safety.
A general description of the operation and maintenance of the circuit breakers.
Instructions for installation and placing the circuit breakers into service.
Instructions for part replacement.
Lists of renewal parts.
Procedures for critical adjustments.
Illustrations, photographs, and descriptions of the circuit breakers.
C. CONFLICT WITH OTHER DOCUMENTS
This instruction bulletin is intended to assist the operator in the safety, use, installation, operation,
and maintenance of the PowlVac® Type PVDH Vacuum Circuit Breaker. This instruction bulletin
covers the design commonalities of the PowlVac® Vacuum Circuit Breaker, and should be used in
conjunction with applicable supplements pertaining to the specific type of circuit breaker purchased.
The specific type supplement for the circuit breaker along with this instruction bulletin must be
studied and understood in order to become fully acquainted with the circuit breaker. If a conflict
exists between this instruction bulletin and any other document relating to safety, use, description,
installation, illustration, maintenance, renewal parts, and procedure, THIS INSTRUCTION BULLETIN
SHALL TAKE PRECEDENCE. THE ONLY EXCEPTION TO THIS IS A SERVICE ADVISORY, A
REVISION, OR AN ADDENDUM TO THIS DOCUMENT ISSUED BY POWELL ELECTRICAL
MANUFACTURING COMPANY.
D. OTHER ITEMS OF CAUTION
It should be noted that some illustrations contained herein may not represent the construction
details of each user’s particular type, but are general illustrations showing component locations.
To the extent required, the products described herein meet all applicable ANSI, IEEE, and NEMA
standards; but no assurance is given with respect to local codes and ordinances because they
vary greatly.
Before unpacking the circuit breakers, study this instruction bulletin and all other associated
documentation. Follow the recommended procedure for putting into service.
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
5
IB-50030B
PowlVac® Type PVDH Circuit Breaker
E. INSTRUCTION BULLETINS ON THE WEB
Powell Electrical Manufacturing Company Instruction Bulletins are posted on the company website
at www.powellservice.com. The instruction bulletins are designed to provide our customers with
technical information about our product and the recommended servicing, maintenance, and renewal
parts.
For more information, please contact Powell Apparatus Service Division at 1-800-480-7273,
713-944-6900, or info@powellservice.com.
II.
SAFETY
Each user has the responsibility to instruct and supervise all personnel associated with the 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 or class of
equipment encountered.
The circuit breakers described in this instruction bulletin are operated by high energy, and high speed
mechanisms interlocked to provide a particular operating sequences. To insure the safety of personnel
associated with installation, operation and maintenance of these circuit breakers, it is important that
the following rules should be observed. These rules are not intended to be a complete safety program,
or to take the place of the user’s complete safety program. They are rather rules to cover the more
important aspects of personnel safety related to PowlVac® circuit breakers.
A. GENERAL
1. Only supervised and qualified personnel trained in the use, installation, operation, and maintenance of power circuit breakers should be allowed to work on this equipment. It is important that
all instruction bulletins, supplements, and service advisories be studied, understood, and followed.
2. Maintenance programs must be consistent with both customer experience and manufacturer’s
recommendations including service advisories and instruction bulletins. A well-planned and
executed routine maintenance program is essential for circuit breaker reliability and safety.
3. Service conditions and circuit breaker applications must be considered in the development of
such programs, including such variables as ambient temperature, actual continuous current,
thermal and cycling, number of operations, interrupting duty, and unusual local conditions such
as excessive dust, ash, corrosive atmosphere, vermin, or insect problems.
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POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
PowlVac® Type PVDH Circuit Breaker
IB-50030B
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
ENCLOSURE.
2. DO NOT WORK ON A CIRCUIT BREAKER WITH THE CONTROL POWER ENERGIZED.
3. THESE CIRCUIT BREAKERS UTILIZE STORED ENERGY-SPRING CHARGED MECHANISMS.
THESE MECHANISMS MUST BE SERVICED ONLY BY SKILLED AND KNOWLEDGEABLE PERSONNEL CAPABLE OF RELEASING EACH SPRING LOAD IN A CONTROLLED MANNER. EXTREME
CARE MUST BE EXERCISED TO KEEP ALL PERSONNEL, TOOLS, AND OTHER OBJECTS CLEAR
OF MECHANISMS, WHICH ARE TO BE OPERATED OR RELEASED. DETAILED INFORMATION
REGARDING THESE MECHANISMS IS FOUND IN THIS INSTRUCTION BULLETIN.
4. DO NOT ATTEMPT TO CLOSE THE CIRCUIT BREAKER MANUALLY ON A LIVE CIRCUIT.
5. DO NOT USE AN OPEN CIRCUIT BREAKER BY ITSELF AS THE SOLE MEANS OF ISOLATING A
HIGH VOLTAGE CIRCUIT. FOR COMPLETE ISOLATION, THE CIRCUIT BREAKER SHOULD BE IN
THE DISCONNECTED POSITION.
6. FOR THE SAFETY OF PERSONNEL PERFORMING MAINTENANCE OPERATIONS ON THE
BREAKER OR CONNECTED EQUIPMENT, ALL COMPONENTS SHOULD BE DISCONNECTED BY
MEANS OF A VISIBLE BREAK AND SECURELY GROUNDED.
7. INTERLOCKS ARE PROVIDED TO ENSURE PROPER OPERATING SEQUENCES OF THE CIRCUIT
BREAKER AND FOR THE SAFETY OF THE OPERATOR. 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 DEVICE INTO POSITION. CONTACT POWELL ELECTRICAL MANUFACTURING COMPANY FOR INSTRUCTIONS.
C. X-RAYS
When high voltage is applied across the contacts of a vacuum interrupter, there is the possible generation of
x-rays. The intensity of this radiation is dependent on the peak voltage and the contact gap. At the normal
operating voltage of this class of equipment, the radiation levels are negligible. At the voltages specified for
testing, it is recommended that the test operator be no closer than one meter in front of the circuit breaker
and separated from the vacuum interrupters under test by the two thickness of steel used in the construction of the circuit breaker frame. The circuit breaker must be either fully open or fully closed when making
high potential test. Do not test with contacts partially open.
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
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IB-50030B
PowlVac® Type PVDH Circuit Breaker
D. SAFETY LABELS
The circuit breaker has these warnings and caution labels attached at the indicated locations.
Whenever the circuit breaker is handled or maintained, these warnings and caution labels must be
observed.
Label Type
CAUTION
Description
Attached to the center face of circuit
breaker blank panel.
READ INSTRUCTIONS BEFORE ENERGIZING.
THIS DEVICE MAY PRODUCE HARMFUL X-RAYS
CAUTION
Attached to the center face of circuit
breaker blank panel.
DO NOT PLACE BREAKER INTO CUBICLE WITHOUT INTERPHASE
BARRIERS INSTALLED AND SECURELY FASTENED.
DANGER
BE SURE CIRCUIT BREAKER CONTACTS ARE OPEN AND
SPRINGS DISCHARGED BEFORE PERFORMING ANY
MAINTENANCE WORK.
CAUTION
Attached to the top right-hand corner face
of circuit breaker front cover, and also in
the mechanism compartment on dashpot
bracket.
Attached to the bottom right-hand corner
face of circuit breaker front cover.
DEPRESSING LEVERING-IN SHAFT WILL TRIP A CLOSED BREAKER.
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POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
PowlVac® Type PVDH Circuit Breaker
III.
IB-50030B
DESCRIPTION
A. GENERAL
The PowlVac® Type PVDH Vacuum Circuit Breaker is a special version of the PowlVac® Circuit
Breaker, designed to replace a Westinghouse type DH. It is a modification of the PowlVac® PV
Vacuum Circuit Breaker, and replaces the DH air-magnetic circuit breaker. It is mounted on a
frame similar to the frame of the type DH circuit breaker, and is equipped with primary disconnects, a secondary disconnect plug, interlocks, and wheels. The entire assembly will fit into a
metal-clad switchgear cell designed for a PVDH circuit breaker without modification to that cell. All
interlocking provided on type DH circuit breaker is also provided on the PowlVac® Type PVDH
vacuum circuit breaker.
This PowlVac® circuit breaker uses sealed vacuum interrupters (fig 1 [u]) to control the primary
circuit. Primary connections to the associated metal-clad switchgear are made by parallel copper
busbars terminating in fingers of the primary disconnects (fig 1 [l]). Insulating supports (fig 1 [s],
[aa]) provide support for the primary disconnects and the vacuum interrupter assemblies.
All the current carrying components are located behind a metal barrier which supports the
insulators. In front of the barrier is the stored energy mechanism assembly, and it provides
motion to each of the vacuum interrupter moving contacts through cast cycloaliphatic epoxy
operating pushrods (fig 1 [y]).
B. THE STORED ENERGY MECHANISM
The front cover has cutouts and apertures giving access to various operating functions.
Removal of ten (10) holding bolts enables the front cover to be removed giving access to the
stored energy mechanism and its interlocks, auxiliary switches, levering-in interlocks, charging
motor and operating solenoids.
The mechanism is of the stored energy type in which a charging motor (fig 4 [t]) is used to
compress a main closing spring (fig 4 [b]). During a closing operation, the energy stored in the
main closing spring is used to close the vacuum interrupter contacts, compress the contact
loading springs, charge the opening springs (fig 4 [a]) and overcome frictional forces. When the
circuit breaker is tripped, the energy stored in the opening and contact loading springs will open
the contacts at the correct speed. The motor, located on the circuit breaker floor pan bottom
right, is supported by a bracket bolted to the floor pan. Its 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 motor is energized, the eccentric shaft rotates and causes the driving arm links to
pivot about the camshaft (fig 4 [y]). The drive pawl (fig 4 [l]) located on the links engages with the
ratchet wheel (fig 4 [aa]) and rotates it, one tooth at a time. The ratchet wheel is prevented from
rotating backward by a holding pawl support arms (fig 4 [h]), which is supported on links which
projects upward from the camshaft.
To insure correct synchronization of the drive and hold pawl, links are located by an adjustable
eccentric stop (fig 4 [i]) 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.
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
9
IB-50030B
PowlVac® Type PVDH Circuit Breaker
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 (fig 4 [n]), and
pointing outward from these are crank pins (fig 4 [o]). These engage with the bottom ends of the connecting
rods (fig 4 [c]), the top ends which engages with the pins, projecting from the spring compression plate,
straddles the main closing spring. As the camshaft rotates, the connecting rods pull the spring compression
plate downward, compressing the closing spring.
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 by the pawl lift
drive plate (fig 4 [ad]), and the motor cutoff switch is operated. The motor cutoff switch (fig 4 [u]) located on
the right of the mechanism is operated by the spring charge flag falling onto the motor cutoff cam (fig 4 [v]).
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 (fig 4 [ac]) engaging against the close latch shaft (fig 4 [ab]).
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 2a).
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 to the drive jackshaft (fig 4 [p]). The jackshaft has
3 downward-pointing pairs of levers that are attached to operating pushrods. The operating pushrods (fig 1
[y]), which are approximately horizontal, are moved toward the vacuum interrupter (fig 1 [u]) by the rotation of
the jackshaft.
At the end of each operating pushrod is a recess, which encloses the contact loading spring (fig 1 [x]). At the
end of this spring is the spring yoke (fig 1 [z]), which connects with the bell crank (fig 1 [w]). The spring yoke
is restrained by a lock nut on a stud, which passes through the contact loading spring, and 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.
Further movement of the operating pushrods compresses the contact loading spring even more and produces a gap between the face of the spring yoke and the lock nut. This gap will reduce as the vacuum
interrupter contacts erode.
The bell cranks, which are located on the outside of lower primary disconnects are supported by operating
pins (fig 1 [ad]), that bridge the disconnects and are connected to drive pins, which passes through slots in
the primary disconnects, bridging the bell cranks and engaging the extensions to the vacuum interrupters
moving stems. 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 0.5-inch by factor of 3 so that the mechanism linkages have relatively large
movements and are less critical.
In the linkage position shown in figures 2c and 2d, the contact loading springs and the main opening springs
are both acting to compress the three (3) main mechanism links (fig 2).
The linkage is restrained from movement by the secondary trip prop acting on the primary trip prop roller.
The 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 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 circuit breaker. The jackshaft extends from the left to the right side of
the circuit breaker frame and is supported at the main circuit breaker frame side sheets and by the mechanism side sheets. The two outer operating rod levers on the jackshaft have connections to the circuit
breaker opening springs (fig 4 [a]).
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POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
PowlVac® Type PVDH Circuit Breaker
IB-50030B
A projection of the left lever engages a shock absorber dashpot (fig 4 [f]), which controls the rebound of the
interrupter contacts on opening operations.
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 (fig 4 [z]), 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 trip latch check switch (fig 4 [q]), operated by a lever on the trip shaft, will now close.
C. ROLLOUT TRUCK
The rollout truck of the PVDH circuit breaker is welded steel construction and is mounted on four wheels.
This truck is equivalent to the truck of a type DH air-magnetic power circuit breaker and will fit in the cells
designed for that circuit breaker.
The truck is equipped with four steel wheels. These wheels are not made to swivel, so movement of the
circuit breaker can be guided by steering the circuit breaker with the “fifth wheel” accessory, which is
furnished with the original switchgear.
D. SECONDARY CONTACTS
The circuit breaker control wiring is arranged for a drawout disconnection by means of a 18 point male
plug (fig 1 [p]). It is designed so that it connects to the corresponding cell mounted female receptacle.
The secondary disconnect plug is mounted on a moveable bracket on the lower left rear side of the
circuit breaker, which permits it to be extended to the rear while the circuit breaker is in the test position
which makes contact with the stationary receptacle in the cell so that the control circuits are completed.
Note that when the circuit breaker is withdrawn, the secondary disconnect automatically disengages.
Normally, the secondary contacts are held stationary relative to the circuit breaker chassis. This is
accomplished by a notch in the bar connecting the secondary contact hand operating rod to the
secondary contact mounting bracket, which acts on the edge of the mechanism panel to hold the
assembly in position.
To engage the secondary contacts while the circuit breaker is in the test position, lift the secondary
disconnect hand operating rod (fig 1 [f]) enough to release it from the mechanism panel and push to the
rear until the secondary contacts engage.
E. GROUND CONTACT
The ground contact (fig 1 [m]) is an assembly of spring loaded fingers, which provides a disconnected
means of grounding the circuit breaker chassis after it has been inserted into a switchgear cell. The
ground contact is located above the secondary disconnect (fig 1 [p]) of the circuit breaker’s rear chassis.
An extension of the switchgear’s ground bus is secured on the cell’s rear wall, which engages with the
ground contact when the circuit breaker is in the fully connected position.
F. LEVERING-IN DEVICE
Caution: Operating the levering-in mechanism will trip the circuit breaker if it is closed.
The purpose of the levering-in device moves the circuit breaker between the test position and the
connected position in the cell. This consist of a shaft which is supported by the circuit breaker frame
which has a levering-in crank arm (fig 1 [n]) at each end. Rollers attached to the crank arms engage
vertical slots in the cell structure, and rotation of the shaft causes the circuit breaker to move in and out
of the circuit breaker cell. The levering-in shaft (fig 5 [g]) supports a worm wheel (fig 5 [a]) near its right
end just inside the right side of the circuit breaker frame. The worm wheel is rotated by a worm gear
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
11
IB-50030B
PowlVac® Type PVDH Circuit Breaker
m
a
af
l
g
b
o m n
c
i j
k
d
e
p
f
q
r
s
h
ae
f
ag
o
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
k.
l.
Blank Panel
Handle
Nameplate
Manual Charging Crank
Operations Counter
Secondary Disconnect Hand
Operating Rod
Cover Attachment Bolts
Spring Charge Indicator
Manual Trip Paddle
Breaker Open/Closed
Indicator
Manual Close Paddle
Primary Disconnect
t
l
u
ac
ab
w
v
m. Ground Contact
n. Levering-in Crank Arm
o. Cell Interlocks
p. Secondary Disconnect Plug
q. Vertical Connector Bar
r. Adapter Bus
s. Main Insulating Support
(Wishbone)
t. Strut Kit
u. Vacuum Interrupter
v. Sliding Contact Finger
Assembly
ad
x
aa
z
y
w. Bell Crank Lever
x. Contact Loading Spring
y. Operating Pushrod
z. Spring Yoke
aa.Insulating Pole Support
ab.Horizontal Connector Bar
ac. Shutter Roller
ad.Operating Pin
ae. Levering-in Shaft
af. Lift point
ag.Wheel
See section on “Recommended Renewal Parts and Repair Procedures” for part number identification
and replacement procedures.
Figure 1. Exterior Components
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POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
PowlVac® Type PVDH Circuit Breaker
IB-50030B
2a
2b
2c
2d
Figure 2. Cam and Fundamental Linkage Positions
a.
b.
c.
d.
e.
f.
g.
h.
j.
k.
l.
m.
n.
Secondary Trip Latch Adjusting Screw
Trip Bar
Secondary Trip Prop
Secondary Linkage Roller
Main Cam Roller
Reset Spring
Camshaft
Main Drive Cam
Center Phase Operating Lever
Main Jackshaft
Primary Trip Prop Roller
Primary Trip Latch Adjusting Screw
Primary Trip Prop
Figure 3. Mechanism and Trip Linkages
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
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IB-50030B
PowlVac® Type PVDH Circuit Breaker
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Figure 4. Interior Components
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POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
PowlVac® Type PVDH Circuit Breaker
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IB-50030B
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Opening Spring
Main Closing Spring
Connecting Rod
Auxiliary Switch
Primary Shunt Trip Coil
Shock Absorber (Dashpot)
Secondary Trip Latch Adjusting Screw
Holding Pawl (Support Arm)
Holding Pawl Adjusting Eccentric
Main Operating Cam
Closing Coil
Drive Pawl
Pawl Support Arm
Crank Arm
Crank Pin
Jackshaft
Latch Check Switch
Floor Trip Interlock
Breaker Closing Release Interlock Arm
Charging Motor
Motor Cutoff Switch
Motor Cutoff Cam
Secondary Trip Prop
Main Cam Roller
Camshaft
Mechanism Reset Spring
Rachet Wheel
Close Latch Shaft
Close Latch Arm
Pawl Lift Plate
Close Bar Adjusting Screw
See section on “Recommended Renewal Parts and Repair Procedures” for part number identification
and replacement procedures.
Figure 4. Interior Components
(fig 5 [c]) on a worm shaft which points in a direction from the front to the back of the circuit
breaker. There is a pin through this shaft near
the front end. This pin engages a slot in the
end of the racking handle and this allows the
crank arms to rotate the levering-in shaft.
There is also a second pin and fork mechanism near the worm gear. This mechanism is
spring loaded, which opens the position,
requiring the front portion of the shaft to be
pushed in which operates the worm gear. A
cam on the levering-in shaft interacts with the
stops on the circuit breaker frame, and this
limits the rotation of the levering-in shaft,
providing positive stops for the fully connected
and test position of the circuit breaker. The
main components of the levering-in device are
shown in figure 5.
G. SHUTTER ROLLERS
The shutter rollers (fig 1 [ac]) are located on the
left and right side of the circuit breaker chassis.
The shutter rollers function is to engage the shutter
operating lever in the cell to raise the shutter over
the stationary primary disconnects as the circuit
breaker is levered into the cell.
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a. Worm wheel
b. Worm shaft
c. Worm gear
d. Interlock link arm
e. Trip interlock shaft
f. Trip interlock shaft adjusting nuts
g. Levering-in shaft
Figure 5. Levering-in Device and Interlock
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
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IB-50030B
PowlVac® Type PVDH Circuit Breaker
H. MOC ACTUATOR
The MOC (Located in the switchgear) is operated by a lever actuator, which extends from the circuit
breaker operating mechanism and through the right side sheet of the circuit breaker frame. Movement of
this actuator is directly related to movement of the circuit breaker mechanism and contacts. As the circuit
breaker is inserted into the cell, this actuator engages a channel member of the Mechanism Operated
Cell Switch (MOC Switch) mechanism located in the switchgear cell. Thus the MOC switch is operated
by the actuator each time the circuit breaker is operated and the contacts of the MOC can be correlated
with circuit breaker contact position in the same manner as the auxiliary switches mounted on the circuit
breaker. Note that the MOC Actuator is furnished on all circuit breakers, but the MOC switches are
provided in the cell only when originally installed or subsequently added.
I. INTERLOCKING
The PowlVac® PVDH circuit breaker is provided with several interlocks, which operate in conjunction
with the switchgear cell to insure the proper operation of the circuit breaker. These interlocks function in
the same manner as the interlocks provided on the Type DH circuit breaker which the PVDH circuit
breaker replaces. Do not attempt to modify or bypass these interlocks, as they are necessary for the safe
operation of the circuit breaker. The interlocks provided are:
1. Levering-in Interlock
The levering-in interlock is designed to
prevent moving the circuit breaker in or out
of the connected position if the circuit breaker
contacts are closed. When the racking handle
is placed on the worm shaft and the shaft is
depressed to engage the levering-in
mechanism, a linkage attached to the worm
gear operates the circuit breaker trip shaft,
tripping the circuit breaker if it is closed.
Once the levering-in shaft begins to rotate,
allowing the circuit breaker to move in and/or
out of the cell, a cam on the shaft keeps the
trip linkage from returning to its normal position, holding the circuit breaker in the tripped
position until it reaches either the fully connected
position or test position.
If excessive force is applied to the levering-in shaft
while the interlock key is engaged, the levering-in
shaft pin, located where the racking handle is
attached, will break, allowing the handle to turn free.
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Trip Assembly
Close Link Assembly
Close Assembly
Trip Link Assembly
Figure 6. Cell Interlocks
The strength of this pin has purposely been selected
to protect inaccessible internal parts of the interlock assembly from mechanical damage. If the pin is
broken, it is an indication that the circuit breaker should be opened before further levering is
attempted. See figure 6.
Note: The levering-in shaft pin (50712P01) is include in the PowlVac® Hardware Kit (60500G24).
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POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
PowlVac® Type PVDH Circuit Breaker
IB-50030B
2. Cell Interlocks
The cell interlocks operate to trip the circuit breaker and discharge the main closing spring when the
circuit breaker is inserted into the cell to the test position or removed from the cell. Cam plates on
the cell floor lift the trip/close assembly levers on the underside of the circuit breaker which trips the
circuit breaker and/or discharge the main closing spring.
The circuit breaker is held trip free by a shaft that has a cam which keeps the trip linkage from
returning to its normal position, holding the circuit breaker in the tripped position until it reaches
either the fully connected position or test position. The cell interlock levers on the underside of the
circuit breaker are coupled to a trip/close link assemblies located in the mechanism housing of the
circuit breaker which operate to engage the circuit breaker tripping and closing mechanisms. See
figure 6. Note, use all thread adjustment links to insure proper operation.
J. OPERATING SOLENOIDS
The closing coil (fig 4 [k]) is an operating solenoid that is located center and beneath the mechanism,
and attached to the circuit breaker floor pan by two screws, which are accessible from underneath the
circuit breaker.
The primary shunt trip coil (fig 4 [e]) is to the left of the mechanism and is supported from the lower
frame channel.
Either a secondary shunt trip coil or an undervoltage trip device may be furnished as an option. When
furnished, either of these devices can be 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.
K. MOTOR CUTOFF SWITCH
The motor cutoff switch (fig 4 [u]), located at the right side of the mechanism, is attached to a bracket,
which is bolted to the circuit breaker floor pan.
L. VACUUM INTERRUPTERS
For a listing of the vacuum interrupters used in PowlVac® PVDH circuit breakers, see Table II. Each
vacuum interrupter bears a label that indicates its part number. Vacuum interrupters must be replaced
only with new interrupters of the same part number. Refer to the circuit breaker supplemental
instructions for the applicable vacuum interrupter description and maintenance procedures.
M. CONTROL CIRCUIT
A Typical DC control scheme is shown in figure 7. The control scheme of any particular circuit breaker
may differ from this scheme, depending on the user’s requirements and the auxiliary devices furnished
with that circuit breaker. Check the wiring diagram supplied with the actual circuit breaker for its wiring.
The sequence of the operation for all control schemes is shown in figure 8.
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
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IB-50030B
PowlVac® Type PVDH Circuit Breaker
N. ANTI-PUMP RELAY
Type PVDH circuit breakers do not include an anti-pump relay, as the existing 52X-Y relay in the
switchgear cell performs this function. When required, the anti-pump will be located on the circuit
breaker’s left upper frame, right of the opening spring.
Figure 7. Typical DC Control Scheme
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POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
PowlVac® Type PVDH Circuit Breaker
IB-50030B
Figure 8. Operation Sequence
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
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IB-50030B
PowlVac® Type PVDH Circuit Breaker
IV. INSTALLATION
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 at Powell Electrical Manufacturing Company.
B. HANDLING
The circuit breaker is equipped with four large wheels so that it may be rolled easily on level floors.
A turning dolly may be used to facilitate handling.
When used with outdoor switchgear, the circuit breaker may be handled using the transfer truck
supplied with the original switchgear.
The circuit breaker must not be lifted from beneath the frame with a forklift or similar device, as
components beneath the circuit breaker could be damaged.
C. STORAGE
It is recommended that the circuit breaker be placed 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:
1. The circuit breaker should be carefully protected against condensation, preferably by storing it
in a warm dry room of moderate temperature, such as 40°-100°F, since dampness has an
adverse effect on the insulating parts. 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.
2. The circuit 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.
If the circuit breaker is stored for any length of time, it should be inspected periodically to see
that rusting has not started and to insure good mechanical condition. Should the circuit breaker
be stored under unfavorable atmospheric conditions, it should be cleaned and dried out before
being placed in service.
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POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
PowlVac® Type PVDH Circuit Breaker
IB-50030B
CAUTION
CAUTION
HIGH VOLTAGES ACROSS THE OPEN
GAPS OF THE VACUUM INTERRUPTER
CAN PRODUCE RADIATION. PERSONNEL SHOULD STAND AT LEAST ONE
METER AWAY FROM THE CIRCUIT
BREAKER, WITH THE COVERS IN
PLACE, WHEN CONDUCTING HIGH
VOLTAGE TEST. TEST VOLTAGE
SHOULD NOT EXCEED 36kVAC, 50 OR
60Hz, OR 50kVDC.
APPLYING ABNORMALLY HIGH VOLTAGE
ACROSS A PAIR OF CONTACTS IN
VACUUM MAY PRODUCE X-RADIATION.
THE RADIATION MAY INCREASE WITH
THE INCREASED VOLTAGE AND/OR
DECREASE IN CONTACT SPACING.
CAUTION
WHEN TESTING WITH DC, USE A DC
HIGH POTENTIAL TEST (Hipot) SET WITH
FULL WAVE RECTIFICATION. MANY DC
HIGH POTENTIAL TEST SETS USE HALFWAVE RECTIFICATION. DO NOT USE
THESE HALF-WAVE 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 INTERRUPTER, AND MAY
PRODUCE ABNORMAL X-RADIATION.
X-RADIATION PRODUCED DURING THIS
TEST WITH THE RECOMMENDED VOLTAGE AND NORMAL CONTACT SPACING
IS EXTREMELY LOW AND WELL BELOW
MAXIMUM PERMITTED BY STANDARDS.
HOWEVER, AS A PRECAUTIONARY
MEASURE AGAINST POSSIBILITY OF
APPLICATION OF HIGHER THAN
RECOMMENDED VOLTAGE AND/OR
BELOW CONTACT SPACING, IT IS
RECOMMENDED THAT ALL OPERATING
PERSONNEL STAND AT LEAST ONE
METER AWAY IN FRONT ON THE
CIRCUIT BREAKER.
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
BREAKER CONTACTS.
CAUTION
CAUTION
Remove all grounding conductors applied
for this test before placing the circuit
breaker back into service.
If DC high potential testing (Hipot) is
required, the DC high potential test machine must not produce instantaneous peak
voltages exceeding 50kV.
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
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IB-50030B
PowlVac® Type PVDH Circuit Breaker
D. PUTTING INTO SERVICE
Before shipment from our factory, all circuit breaker functions will have been thoroughly checked. The
user must recheck the operation, Powell Electrical manufacturing company recommends that the check
be performed in sequence listed below:
1.
2.
3.
4.
5.
6.
7.
Commissioning
High voltage insulation integrity
Vacuum integrity
Control voltage insulation integrity
Mechanical operation check
Electrical operation check
Dimensional check
1. Commissioning
Refer to the original equipment’s instruction book, and use the “Annex” section in this instruction
bulletin as a general guide.
2. High Voltage Insulation Integrity
The circuit breaker’s high voltage insulation system, which consists of the pushrods and conductor
supports assemblies, should be hipot tested prior to initially putting the circuit breaker in service or
following the interruption of a fault. The circuit breaker primary phase-to-phase and phase-to-ground
insulation should be tested with the circuit breaker in the “closed” position. Test each pole of the
circuit breaker separately, with the other two poles and the circuit breaker frame grounded.
Field maintenance insulation resistance testing can be conducted with either AC or DC high potential
testing (Hipot). DC testing is very common due to the availability of the equipment. Consistent and
historical readings are more important than predetermined values. A clean dry circuit breaker will
help yield accurate and consistent readings.
Recommended maintenance test voltages for PowlVac® circuit breakers are:
•
15kV circuit breakers @ 27kVAC or 37kVDC for one minute.
3. Vacuum Integrity
Powell recommends AC testing for reliable verification of vacuum integrity. Presently, all PowlVac®
5kV and 15kV circuit breakers should be tested with a minimum of 25kVAC applied across fully
open contacts for 10 to 15 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.” See the “high voltage insulation integrity” section.
Powell offers a compact and lightweight AC vacuum interrupter integrity test set, designed specifically for PowlVac® circuit breakers, which provides the appropriate 25kVAC voltage for the prescribed time. This test set eliminates the element of leakage interpretation. Two high voltage leads
are connected across a fully open vacuum interrupter and the test is initiated. A red neon lamp
indicates the test is in progress. The test is automatically timed and terminated with a green LED for
pass, or a red LED for fail. Contact Powell Apparatus Service Division (PASD) for more information.
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POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
PowlVac® Type PVDH Circuit Breaker
IB-50030B
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. Several testing companies and customers insist on the use of DC testing. When DC
testing is preferred, a test set providing a full wave rectified 50kV DC hipot voltage can be applied for 5
seconds as a “go - no go” test. 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 polarity across the vacuum interrupter. A vacuum interrupter should be questioned
only if it has failed both DC polarity tests.
4. 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 tester or with an AC hipot tester. The AC hipot test should be made at 1125 volts,
60Hz, for one minute. The charging motor must be disconnected at its connection plug prior to testing
the control circuit. The motor itself may be similarly tested at a voltage not to exceed 675 volts, 60Hz. Be
sure to remove any test jumpers and reconnect the charging motor when the tests are complete.
5. Mechanical Operation Check
To check the mechanical operation of the circuit breaker, insert the manual charging handle into the
manual charging crank (fig 1 [d]) 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 handle until it is horizontal and then
depress. The procedure is repeated until the spring charge flag indicates that the main close spring is
now charged. This requires about 60 operations of the handle. Remove the handle. Push the round blue
“push to close” plate (fig 1 [k]) and the circuit breaker will close. The flag located above the “push to
close” plate will now read “closed.” Push the round red trip plate (fig 1 [i]) located at the top of the
escutcheon and the circuit breaker will open as indicated by the circuit breaker condition flag.
6. Electrical Operation Check
To check the electrical operation of the circuit breaker, the circuit breaker must be moved to the test
position. A test box or test plug may be used to verify the electrical operation check. See the section,
“Inserting the Circuit Breaker into the Switchgear Equipment.”
7. Dimensional Check
When inserting the circuit breaker into the switchgear equipment, it may be necessary to shim the circuit
breaker wheels to ensure proper alignment. The appropriate measurement from the working edge of
each wheel is 28 13/16" + 1/8".
When the circuit breaker has been inserted and fully levered into the cell, there may be a gap or binding
between the circuit breaker front cover, and the cell gas barrier. Shims may be used on the front cover
to give a correct fit and finish between the front cover and the cell gas barrier.
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
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IB-50030B
PowlVac® Type PVDH Circuit Breaker
E. INSERTING CIRCUIT BREAKER INTO SWITCHGEAR EQUIPMENT
Refer to the instruction bulletin provided with the original switchgear equipment for instructions covering
insertion of the circuit breaker into the switchgear equipment.
1. Examine the Primary Disconnecting Fingers
Examine primary disconnecting fingers for any signs of damage. See that they are properly
positioned and that the retaining bolts are in place in the end of the circuit breaker studs. Clean off
any dirt, paper, etc.
Check secondary contacts to see that none are bent out of alignment.
Make sure that the cell is clean and clear of anything that might interfere with circuit breaker travel.
2. Push the Circuit Breaker into the Test Position in the Cell
Verify that the “Circuit breaker open/closed indicator” reads “Breaker open,” which is located on the
front cover, and if not, push the “manual trip paddle” inward to trip open the circuit breaker.
Line up the two rear wheel guides of circuit breaker’s wheel with the guide rails on the bottom right
and left hand side of cell floor.
Do not start the circuit breaker into cell with the turning dolly. This could cause the MOC actuator to fail, which engages with the pantograph in the cell, and could damage the levering-in
screw.
Push the circuit breaker into the cell until the crank arms come to a mechanical stop.
KEEP HANDS OFF TOP EDGE OF FRONT STEEL BARRIER WHEN PUSHING CIRCUIT
BREAKER INTO CELL.
The circuit breaker is now in TEST POSITION.
NOTE: THE CIRCUIT BREAKER MAY OPEN AND ITS CLOSING SPRING MAY BE DISCHARGED
WHILE IT IS PUSHED INTO THE CELL, DEPENDING ON WHETHER THE CIRCUIT BREAKER WAS
LEFT CLOSED OR OPEN, OR WHETHER THE CLOSING SPRING WAS LEFT CHARGED OR DISCHARGED WHILE THE CIRCUIT BREAKER WAS STANDING OUTSIDE THE HOUSING.
3. Engage the Secondary Contacts
Lift the handle on the left-hand side of the chassis front to a horizontal position. Lift further to disengage the notch in the rod from the top edge of panel and push towards the rear of the circuit breaker.
The small horizontal pin in the handle will engage the two slots in the lever, which is pivoted immediately above the handle. Push down on the curved end of the lever as far as it will go.
NOTE: AS SOON AS THE SECONDARY CONTACTS MAKE UP THE CHARGING MOTOR WILL
CHARGE THE CLOSING SPRING IF THE CONTROL CIRCUIT IS ENERGIZED.
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POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
PowlVac® Type PVDH Circuit Breaker
IB-50030B
4. Operate the Circuit Breaker in the Test Position
The circuit breaker may now be electrically closed and tripped by using the breaker control switch.
The control of the circuit breaker is arranged so that the closing spring will recharge immediately after
each closing operation.
5. Trip the Circuit Breaker Open
6. Lever the Circuit Breaker into the Cell
A mechanical interlock prevents levering circuit breaker into or out of the cell if circuit breaker is closed.
7. Operate the Circuit Breaker as Required
8. Trip the Circuit Breaker Open
9. Remove the Circuit Breaker from the Connected Position
Engage the racking handle on the levering-in shaft and turn counterclockwise until crank rotates to a
stop.
Circuit breaker is then secured in “Test Position.”
Caution
The pole unit parts are alive at full circuit voltage when the circuit breaker is in the fully engaged
position. Before moving the circuit breaker into that position, make sure the main barrier assembly
has been properly fastened in place. Failure to do this may cause serious damage or injury.
10. Remove the Circuit Breaker from the Cell
Pull circuit breaker completely out of cell using the handles on front cover.
NOTE: THE CIRCUIT BREAKER MAY OPEN, AND ITS CLOSING SPRING MAY BE DISCHARGED AS IT
IS WITHDRAWN FROM THE CELL DEPENDING ON WHETHER CIRCUIT BREAKER WAS LEFT
CLOSED OR OPEN, OR WHETHER SPRING WAS LEFT CHARGED OR DISCHARGED WHILE
STANDING IN THE TEST POSITION.
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
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IB-50030B
V.
PowlVac® Type PVDH Circuit Breaker
MAINTENANCE
Contact Powell Apparatus Service Division for assistance in performing maintenance
or setting up a maintenance program. The website is located at
www.powellservice.com, or call 1-800-480-7273.
A. GENERAL
1. Introduction
A regular maintenance schedule should be established to obtain the best service and
reliability from the circuit breaker. PowlVac® circuit breakers are designed to comply with
industry standards requiring maintenance every 2000 operations or once in the first year,
and then the interval can be extended depending on the environment.
Actual inspection and maintenance will depend upon individual application conditions
such as number of operations, magnitude of currents switched, desired overall system
reliability, and 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 necessary maintenance be performed as soon as practical. Some
atmospheric conditions such as extremes of dust, moisture, or corrosive gases might
indicate inspection and maintenance at more frequent intervals than 2000 operations.
Very clean and dry conditions combined with low switching duty will justify longer times
between inspection and maintenance operations. With experience, each user can set an
inspection and maintenance schedule that is best suited for the particular use.
A permanent record of all maintenance work should be kept, the degree of detail depends
on the operating conditions. In any event, it will be a valuable reference for subsequent
maintenance work and for station operation. It is recommended that the record include
reports of tests made, the condition of circuit breakers, repairs, and adjustments that were
made. This record should begin with any checks done at the time of installation.
Because of extensive quality control checks made at the factory, the operations counter
on a new circuit breaker will normally register over a hundred operations. The actual
reading of the operations counter should be recorded when the circuit breaker is put into
service and whenever any maintenance is performed.
Before attempting any maintenance work, take note of safety practices outlines in Section
II of this bulletin.
CAUTION
MAKE CERTAIN THAT THE CONTROL CIRCUITS ARE DE-ENERGIZED AND THE
CIRCUIT BREAKER IS RESTING SECURELY OUTSIDE THE SWITCHGEAR HOUSING.
DO NOT WORK ON A CLOSED CIRCUIT BREAKER OR A CIRCUIT BREAKER WITH THE
CLOSING SPRING CHARGED.
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POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
PowlVac® Type PVDH Circuit Breaker
IB-50030B
2. Inspection and Cleaning
Give the circuit breaker a visual check for loose or damaged parts. Tighten or replace loose or
missing hardware. Any part damaged to interfere with normal operation of the circuit breaker should
be replaced. This inspection will be much easier if the front cover and interphase barrier assembly is
removed.
Clean the circuit breaker, removing loose dust, and dirt. Do not use an air hose to blow the circuit
breaker out; this may result in loose dirt or grit being blown into bearings or other critical parts and
causing excessive wear. Either use a vacuum cleaner or wipe with a dry lint-free cloth or an industrial-type wiper.
Primary insulation, including the interrupter supports and the operating pushrods, should be cleaned
also. Wipe clean with a dry lint-free cloth or an industrial type wiper. If dirt adheres and will not come
off 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, as detergent may leave an electrical conducting residue on the surface as
it dries.
Caution
When cleaning the circuit breaker support insulators 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.
B. MECHANISM AREA
1. Mechanical Operation
Remove the circuit breaker front cover, exposing the mechanism. Make a careful visual inspection of
the mechanism for loose or excessively worn parts. Operate the circuit breaker several times
manually.
See the section headed “Mechanical Operation Check” under the heading “Putting into Service” for
further information.
2. Lubrication
Lubricate the mechanism and other specified parts in accordance with the lubrication chart, Table I.
Powell offers a complete lubrication kit (Powlube-102) which contains all the lubricants required for
maintaining 6-10 circuit breakers.
The chart shows the location of all surfaces that should be lubricated together with the type of
lubricant and method of application. The guiding rule in lubrication should be to lubricate regularly,
use lubricant sparingly, and remove all excess lubricant.
Rheolube-368A is interchangeable with Anderol 757 Grease and should be lightly applied to those
bearing surfaces that are accessible. A light synthetic machine oil such as Anderol 456 should be
used to penetrate the surfaces, which are inaccessible. Mobilgrease 28 should be applied to the
contact surfaces. Before applying any type of lubrication to the circuit breaker, the mechanism
should not be charged, and all springs should be discharged. There is no necessity to disassemble
the mechanism for lubrication. Tilting the circuit breaker will facilitate the entry of the lubricant to the
bearing surfaces.
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
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IB-50030B
PowlVac® Type PVDH Circuit Breaker
3. Closing Spring Removal and Slow Closing of Mechanism
Disassembly of the mechanism is not required for routine lubrication. However, for major overhaul,
removal of the closing spring is necessary. Removal of the spring permits slow closing of the vacuum
interrupter contacts.
The procedure for spring removal is as follows:
With closing spring discharged and circuit breaker contacts open, remove the screw at the top of the
spring rod together with the flat washer and lock washer. Remove the right-angle bracket by unfastening
the two attachment screws. Remove the spacer from below the bracket. Turn the bracket 90° and
replace it on top of the spring yoke. Place the spacer on top of the bracket with the flat washer above it.
Insert screw and screw down until tension is taken off the connecting rods (figure 9). The connecting
rods are of a “keyhole” design and can now be unhooked from the spring yoke pins and the spring
assembly removed with a slight rocking motion. Care should be taken during reassembly to insure
correct location of the flat washer, lock washer, and spacer. See figure 10.
With the main spring assembly removed, rotate the camshaft so that the crank arms are pointing downward. The main linkage will now move into the reset position. Push the “manual close paddle” and hold
in while operating the hand charge lever to rotate the camshaft. Once the close release latch arm is past
the close shaft latch plate, the “manual close paddle” may be released. As the main cam engages the
main linkage roller, the jackshaft will commence to rotate. Continue to operate the hand charge lever
until the crank arms point upward. The circuit breaker will now be closed and there will be a gap between the contact overtravel nuts and the contact spring yokes.
c
Figure 9. Main Closing Spring Assembly
Compressed for Removal
a.
b.
c.
b
a
Connecting Rod
Flat Washer
Screw
d
Figure 10. Main Closing Spring Assembly
Installed
a.
b.
c.
d.
e.
28
Bracket
Spacer
Flat Washer
Screw
Lock Washer
a
e
c
b
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
PowlVac® Type PVDH Circuit Breaker
IB-50030B
4. Mechanism Adjustments
Several factory adjustments in the mechanism are described below. No adjustment of these settings is
required for routine maintenance, but they may need to be adjusted after major overhaul or removal of
the mechanism. “DO NOT ADJUST THESE SETTINGS UNNECESSARILY, AS MECHANICAL
DAMAGE MAY OCCUR.”
a. Adjustment of Ratchet Wheel Holding Pawl
The ratchet wheel holding pawl support arm (fig 4 [h]) is adjusted by an adjusting eccentric cam (fig
4 [i]). If the pawl is not properly adjusted, there will be a “knocking” noise when the ratcheting
mechanism is operating, or the mechanism will not ratchet at all. To adjust the pawl, remove the
escutcheon to gain access to the head of the bolt holding the eccentric cam. Loosen the bolt slightly.
While charging the spring using the charging motor to drive the mechanism, grip the eccentric cam
with a pair of slip-joint pliers or a similar tool and rotate the cam slightly until the ratcheting operation
is smooth. This may require several charging cycles, as each charging cycle lasts only a few seconds. When the eccentric cam is properly set, retighten the mounting bolt and replace the escutcheon. Be sure that the escutcheon is reinstalled on the proper circuit breaker, since the escutcheon
contains the nameplate with all the circuit breaker’s rating and serial number information.
b. Adjustment of Primary and Secondary Trip Latches and Latch Check Switch
Adjust the secondary trip latch adjusting screw (fig 4 [g]) so that the overlap of the secondary trip
prop on the primary trip prop roller is approximately 0.125 inch. Adjust the primary trip latch adjusting
screw (fig 11) so that with the main linkage in the reset position the clearance between the primary
trip latch roller and the secondary trip prop is 0.015 inch. The primary trip latch adjusting screw is
accessible from the rear of the mechanism, between the legs of the lower center phase support
insulator. With a 0.015-0.045 inch wire gauge between the trip bar lever and the secondary trip latch
adjusting screw, the latch check switch should be open. With no gap between the lever and the
screw, the latch check switch should be closed.
Figure 11. Primary Trip Latch Adjusting Screw
c. Adjustment of Close Latch
The close shaft passes through the side sheets
of the 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 latch arm (fig 4 [ac]), which is fixed to the
camshaft. The other end of the close shaft is on
the right side of the mechanism and a small
lever attached to it is positioned by an adjusting
screw. With the main closing spring charged,
turn the latch adjusting screw inward toward the rear of the circuit breaker until the latch is
released and the circuit breaker closes. Unscrew the adjustment screw 2 1/2 turns and lock in
position with the locking nut.
5. Electrical Operation
After any necessary mechanical maintenance and lubrication are done, operate the circuit breaker
electrically several times to ensure that the electrical control system works properly. See section headed
“Electrical Operation” under the “Putting into Service” heading in this instruction bulletin.
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
29
IB-50030B
PowlVac® Type PVDH Circuit Breaker
Table l. Lubrication
Ref.
Figure
Lubricant
Method
Primary Disconnect
Fig 12 [N]
Mobilgrease 28
Ground Contact
Fig 1 [m]
Mobilgrease 28
Sliding Contact Blocks
Fig 12 [O]
Mobilgrease 28
Secondary Disconnect
Plug
Fig 1 [p]
Mobilgrease 28
Wipe clean. Apply lubricant only to actual contact
surface.
Wipe clean. Apply lubricant only to actual contact
surface.
With circuit breaker closed, wipe clean and apply thin
smear of lubricant above sliding contact fingers.
Wipe clean. Apply lubricant only to actual contact
surface.
Camshaft Needle Bearings
Fig 12 [U]
Anderol 456 Oil
Crank Pins
Fig 12 [G]
Anderol 456 Oil
Spring Yoke Pin
Fig 12 [A]
Anderol 456 Oil
Ratchet Wheel
Fig 12 [K]
Rheolube 368A Grease
Pawls
Fig 12 [J]
Anderol 456 Oil
Pawl Support Arms
Fig 12 [H]
Anderol 456 Oil
Main Spring Guide Rod
Fig 12 [B]
Anderol 456 Oil
Motor Drive Shaft
Support Bearings
Motor Drive Shaft Roller
Needle Bearings
Motor Drive Shaft
Coupling
Flag Support Pin
Fig 12 [W]
Anderol 456 Oil
Fig 12 [M]
Anderol 456 Oil
Fig 12 [Y]
Anderol 456 Oil
Fig 12 [V]
Anderol 456 Oil
Close Shaft Support
Bearing
Close Latch Shaft Face
Fig 12 [S]
Anderol 456 Oil
Fig 12 [L]
Rheolube 368A Grease
Primary Trip Prop
Fig 12 [R]
Anderol 456 Oil
Main Linkage
Fig 12 [T]
Anderol 456 Oil
Apply to penetrate where pins pass through lines.
Fixed Linkage Pin
Fig 12 [I]
Anderol 456 Oil
Apply to penetrate where pin passes through end link.
Trip Shaft Support
Bearings
Jackshaft Outer Bearings
Support
Jackshaft Supports at
Mechanism
Flag Drive Lever at
Jackshaft
Motor Cutoff Cam
Fig 12 [F]
Anderol 456 Oil
Fig 12 [C]
Anderol 456 Oil
Fig 12 [D]
Anderol 456 Oil
Fig 12 [Z]
Anderol 456 Oil
Fig 12 [X]
Rheolube 368A Grease
Fig 12 [E]
Anderol 456 Oil
Fig 12 [Q]
Anderol 456 Oil
Fig 12 [P]
Anderol 456 Oil
Location
Ele ctrical Parts
Me chanical Parts
Jackshaft Lever Pins
Passing Through Pushrods
Cell Interlock Trip Inner
Shaft
Cell Interlock Linkage
Apply a light coating of grease and remove all excess.
Apply to peripheral surface only.
Avoid lubricant on pushrods.
Note:
1. Powlube-102 is a PowlVac® lubrication kit that consist of:
a. One 2-oz Anderol 456 needle applicator oil
b. One 2-oz Rheolube 368A grease tube
c. One Mobilgrease 28 tube
2. Rheolube 368A grease is interchangeable with Anderol 757 grease.
30
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
PowlVac® Type PVDH Circuit Breaker
IB-50030B
B
A
N
A. Spring Yoke Pin
B. Main Spring
Guide Rod
F
D
I
H
C
E
M
K
L
G
C. Jackshaft
Outer Bearing
D. Jackshaft
Support
E. Jackshaft Lever
Pin
F. Trip Shaft
Bearing
J. Pawl
K. Rachet Wheel
J
G. Crank Pin
L. Close Latch
Shaft Face
H. Pawl Support
Arm
M. Motor Drive
Shaft Roller
Needle Bearing
I. Fixed Linkage
Pin
N. Primary
Disconnect
Figure 12. Lubrication
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
31
IB-50030B
PowlVac® Type PVDH Circuit Breaker
P
Q
O
T
Z
V
S
X
W
O. Sliding Contact
Block
P. Cell Interlock
Linkage
Q. Cell Interlock
Trip Inner Shaft
R. Primary Trip
Prop
V. Flag Support
Pin
W. Motor Drive
Shaft Support
Bearing
R
U
Y
S. Close Shaft
Support Bearing
T. Main Linkage
X. Motor Cutoff
Cam
Y. Motor Drive
Shaft Coupling
U. Camshaft Needle
Bearings
Z. Open-Closed
Flag Drive Lever
at JackShaft
m. Ground Contact
p. Secondary
Disconnect Plug
Figure 12. Lubrication
32
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
PowlVac® Type PVDH Circuit Breaker
IB-50030B
C. VACUUM INTERRUPTER AND CONTACT AREA
1. Vacuum Interrupter Contact Erosion
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 an overtravel gap
about 7/16 to 5/8 inch between the contact loading spring yoke and the nut on the pushrod stud.
As the contacts erode with use, this gap will decrease. Because the factory setting of the
overtravel gap varies slightly for each interrupter, a label is provided on the lower part of each
interrupter. The original factory setting of the overtravel gap and the end-of-life measurement of
this gap are recorded on this label. When the overtravel gap measurement reaches the end-oflife value given on this label, the interrupter should be replace. Detailed instructions for this
replacement are given in the supplementary instructions, which accompany this instruction
bulletin, for each type of vacuum interrupter.
2. Sliding Contact Finger Wear
Remove the four socket-head screws holding the sliding contact assemblies and pivot the assemblies down. Wipe the lubricant from the surfaces of the lower contact block, the fingers and the lower
main horizontal primary disconnects and examine these surfaces. The finger locations should
present a burnished silver contact without copper appearance at more than one location. If copper is
visible at more than one location per pole, or the silver is torn on the lower contact block, the interrupter should be replaced.
The sliding contact finger assemblies on the PowlVac® circuit breaker 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 should be reversed.
Loosen the bolt holding the rear mounting clip and remove the finger assembly. Tighten the bolt
holding the rear mounting 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 disconnects, then reassemble the sliding contact fingers.
3. Vacuum Integrity
Refer to section on vacuum integrity and testing interrupters. (Refer to section IV. D.3.)
Vacuum interrupters used in PowlVac® circuit breakers are highly reliable interrupting elements.
Satisfactory performance of these devices is primarily dependent upon the integrity of the vacuum in
the chamber and internal dielectric strength. Both these parameters can be readily checked by a AC
high potential test.
There are several factory adjustments in the interrupter area, which are described in the supplemental
instructions for each particular rating of circuit breaker. No adjustment of these settings is required for
routine maintenance. The dimensions given in the supplements are for new interrupters, and all of them
will change during the life of the interrupter. Adjustment of these settings will be required only after
interrupter replacement. “DO NOT ADJUST THESE SETTINGS UNNECESSARILY AS DAMAGE TO
THE CIRCUIT BREAKER MAY RESULT.”
If major disassembly of the mechanism or the vacuum interrupters becomes necessary for any
reason, all of the dimensions found in the supplemental directions must be measured and recorded
prior to disassembly if interrupter replacement is not required. These dimensions must be restored to
the “as-found” condition upon reassembly to insure proper timing and operation of the circuit breaker.
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
33
IB-50030B
PowlVac® Type PVDH Circuit Breaker
D. OPTIONAL MAINTENANCE PROCEDURES
1. High Potential Tests
These tests are not ordinarily required for routine maintenance, but should be performed after a
heavy fault interruption or after the circuit breaker has been in storage for an extended time,
especially in a damp location or other adverse environment. Both the High Voltage Insulation
Integrity and Control Voltage Insulation Integrity tests should be performed. See the section of this
instruction bulletin headed “PUTTING INTO SERVICE” for details of these procedures.
2. Primary Resistance Check
This 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, except for the sliding contact
finger assemblies. This check should be performed after the replacement of a vacuum interrupter
assembly.
To check the 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 shall not exceed the values provided in the instruction bulletin for the specific class,
type, and rating of the circuit breaker being measured.
When making this test, be sure that the test current passes through both main horizontal primary
disconnect devices of each pair, or the resistance measurement will be affected. This may be done by
connecting the current source leads to two blocks of full round edge copper 1 inch thick by 3 or 4
inches wide by 4 inches long, and pressing these blocks into the upper and lower primary disconnect
devices of the circuit breaker. The blocks should be silver- or tin-plated to simulate the primary disconnect devices in the circuit breaker compartment. The voltage drop measurement may be made between
these two blocks.
For the primary resistance, a data copy can be supplied upon request by notifying the nearest
representative of Powell Electrical Manufacturing Company at Powell Apparatus Service Division (PASD).
The website is www.powellservice.com, or call 1-800-480-7273.
The micro-ohm values of resistance must not exceed the following limits:
Breaker
Type
15PV50
34
Rated
Rated
Resistance
kV Continuous Micro-ohms
Current A
15.0
1200
70
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
PowlVac® Type PVDH Circuit Breaker
IB-50030B
VI. RECOMMENDED RENEWAL PARTS AND REPAIR PROCEDURES
A. ORDERING INSTRUCTIONS
1. Order Renewal Parts from Powell Apparatus Service Division (PASD). The website is located
at www.powellservice.com, or call 1-800-480-7273.
2. Always specify complete nameplate information, including:
a.
b.
c.
d.
e.
f.
Type
Serial Number
Rated Voltage
Rated Amps
Impulse Withstand
Control Voltage (for control devices and coils)
3. Specify the quantity and description of the part, and IB-50030B. If the part is in the tables of
recommended renewal parts, give its catalog number. If the part is not in the tables, the
description should be accompanied by a marked illustration from this bulletin, a photo, or a
sketch showing the part needed.
4. Standard hardware, such as screws, bolts, nuts, washers, etc., should be purchased locally.
Hardware used in bolted joints of conductors must be SAE Grade 5 or better in order to insure
proper clamping torque and prevent overheating of the joints. Hardware should be plated to
deter corrosion.
B. RECOMMENDED RENEWAL PARTS
It is recommended that sufficient renewal parts be carried in stock to enable the prompt replacement of any worn broken or damaged parts. A stock of such parts minimizes service interruptions
caused by breakdowns and saves time and expense. When continuous operation is a primary
consideration, more renewal parts should be carried, the amount depending on the severity of the
service and the time required to secure replacements.
Spare or replacement parts that are furnished may not be identical to the original parts, since
improvements are made from time to time. The parts which are furnished, however, will be
interchangeable. Tables II, III and IV 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 fraction thereof.
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.
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
35
IB-50030B
PowlVac® Type PVDH Circuit Breaker
Table II. Vacuum Interrupter and Sliding Contact Finger Assemblies
Breaker
Type
Rated
kV
Rated
Continuous
Current
RatedShort Vacuum Interrupter Sliding Contact
Circuit
Assembly
Finger Assembly
Current
[3 per Bkr.]
[6 per Bkr.]
kA
(1)
15PV25DHE
15. 0
1200A
25.0
60500G10P
50952G01P
15PV25DHE
15. 0
2000A
25.0
60500G10P
50952G01P
15PV36DHE
15. 0
1200A
36.0
60500G04P
50952G01P
15PV36DHE
15. 0
2000A
36.0
60500G04P
50952G01P
15PV36DHE
15. 0
1200A
36.0
60500G10P
50952G01P
15PV36DHE
15. 0
2000A
36.0
60500G10P
50952G01P
15PV50DHE
15. 0
1200A
50.0
60500G04P
50952G01P
15PV50DHE
15. 0
2000A
50.0
60500G04P
50956G01P
15PV50DHE
15. 0
3000A
50.0
60500G04P
50956G02P
Notes for Table ll. The numbers in ( ) indicate that there is a reference note from below.
1. When replacing a vacuum interrupter assembly, specify the part number located on the vacuum
interrupter bottle, this will help determine the vacuum interrupter assembly for the circuit breaker.
a. For the interrupter assembly 60500G04P, the part number on the vacuum interrupter bottle is 35297.
b. For the interrupter assembly 60500G10P, the part number on the vacuum interrupter bottle is 34999C.
Table lll. Control Devices (1)
3 cycle or 5 cycle
Primary Shunt Secondary Shunt UnderVoltage
Trip Coil (2)
Trip Coil (3)
Device (4)
Control
Voltage
Closing
Coil
Charging
Motor
Anti-Pump
Relay
24VDC
N/A
50041G05P
50042G06P
50028G08P
N/A
N/A
48VDC
50026G01P
50041G01P
50042G01P
50028G07P
50960G06P
RR2BA-US-DC 48V
125VDC
50026G03P
50041G02P
50042G03P
50028G06P
50960G04P
RR3B-U-DC 110V
250VDC
50026G04P
50041G03P
50042G04P
50028G05P
50960G05P RR2BA-US-DC 110V
120VAC
50026G01P
50041G01P
50042G01P
50028G09P
50960G04P RR2BA-US-AC 120V
240VAC
50026G02P
50041G06P
50042G02P
N/A
50960G05P RR2BA-US-AC 240V
Capacitor
Trip (6)
N/A
50041G04P
N/A
N/A
N/A
N/A
Notes for Table lll. The numbers in ( ) indicate that there is a reference note from below.
1. One required per circuit breaker, if the circuit breaker was originally equipped with this item.
All circuit breakers have closing coil, primary shunt trip coil, charging motor, and anti-pump relay.
Secondary shunt trip coils and undervoltage devices are optional. See note 2-4.
2. Primary shunt trip coil.
3. Secondary shunt trip coil cannot be furnished with undervoltage device.
4. Where furnished, cannot be present with secondary shunt trip coil. Consult factory for part numbers
for secondary shunt trip coils.
5. For 250VDC applications, a dropping resistor, 50747G02, is required in series with this relay’s coil.
6. For use with capacitor trip units with 240VAC input. Consult factory for other ratings.
36
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
PowlVac® Type PVDH Circuit Breaker
IB-50030B
Table IV. Miscellaneous Parts
Catalog
No.
Description
1
Auxiliary Switch
Assembly
(LN: Ring Lugs)
(LP: Slip-on Lugs)
2
Insulating Pole
Support
1200A
2000A
3000A
3
4
5
6
7
Breaker
Type
15PV25DH
500 MVA
102108LN
102108LP
Main Insulating
Support
(Wishbone)
1200A
2000A
3000A
Manual Charging
Handle
Motor Cutoff
Switch
Assembly
1200A
2000A
3000A
15PV50DH
1000 MVA
102108LN
102108LP
Illustration
1
3
50642G01
50642G01
Latch Check
Switch
1200A BA-2RV2-A2
2000A BA-2RV2-A2
3000A
Main Closing
Spring Assembly
15PV36DH
750 MVA
102108LN
102108LP
Qty.
per
Brk.
60217G01
50642G01
50642G01
50642G01
N/A
50642G01
1
BA-2RV2-A2
BA-2RV2-A2
BA-2RV2-A2
N/A
BA-2RV2-A2
60217G01
60217G01
1
6
50643G01
50643G01
50643G01
50643G01
50643G01
N/A
50643G01
50235P01
50235P01
50235P01
1
1
50756G03P
50756G03P
50756G03P
50756G03P
50756G03P
N/A
50756G03P
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
37
IB-50030B
PowlVac® Type PVDH Circuit Breaker
Table IV. Miscellaneous Parts
Catalog
No.
Description
Breaker Type
8
PowlVac® Hardware
Kit
9
PowlVac®
Lubrication Kit
Consisting of:
(2 oz Anderol 456
Needle Application)
(2 oz Rheolube
368A Tube)
(2 oz Mobil 28 Tube)
Primary Disconnect
Fingers
1200A
2000A
3000A
10
11
12
13
Operating Pushrod
Assembly
1200A
2000A
3000A
Racking Handle
1200A
2000A
3000A
Shock Absorber
(Dashpot)
1200A
2000A
3000A
14
Vacuum Integrity
Tester
15
W heel
15PV25DH
500 MVA
60500G24
15PV36DH
750 MVA
60500G24
15PV50DH
1000 MVA
60500G24
1
Powlube-102
Powlube-102
Powlube-102
1
Illustration
6
50790G07P
50790G07P
50790G07P
61258G01P
3
50934G15
50934G16
50934G16
50934G15
50934G16
N/A
50934G15
N/A
50934G15
67775H04
67775H04
67775H04
1
1
50735G01
50735G01
50735G01
50735G01
50735G01
N/A
50735G01
60900G04
60900G04
60900G04
61118P01
61118P01
61118P01
61118P01
61118P01
N/A
61118P01
1
4
1200A
2000A
3000A
38
Qty.
per
Brk.
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
PowlVac® Type PVDH Circuit Breaker
IB-50030B
C. REPLACEMENT PROCEDURES
This section includes instructions for replacing all the parts recommended as renewal parts. Before
attempting any maintenance repair work, take note of safety practices outlined in Section II of this
bulletin.
MAKE CERTAIN THAT THE CONTROL CIRCUITS ARE DE-ENERGIZED AND THE CIRCUIT
BREAKER IS RESTING SECURELY OUTSIDE THE SWITCHGEAR HOUSING. DO NOT START TO
WORK ON A CLOSED CIRCUIT BREAKER OR A CIRCUIT BREAKER WITH THE CLOSING SPRING
CHARGED. WHEN ANY MAINTENANCE PROCEDURE REQUIRES OPENING OR CLOSING OF THE
CIRCUIT BREAKER OR CHARGING OF ANY OF THE MECHANISM SPRINGS, EXERCISE EXTREME
CARE TO MAKE SURE THAT ALL PERSONNEL, TOOLS, AND OTHER OBJECTS ARE KEPT WELL
CLEAR OF THE MOVING PARTS OR THE CHARGED SPRINGS.
1. Vacuum Interrupter Assembly
Refer to the applicable Vacuum Interrupter Addendum.
2. Sliding Contact Finger Assembly
Instructions are given in the maintenance section of this instruction bulletin
for removing and inverting the sliding contact finger assembly. Follow these
instructions, but install the new finger assembly instead of reinstalling the
old one. See figure 1 [v] to replace it.
3. Closing Coil Assembly
The closing coil is located in the lower front center of the circuit breaker.
See figure 4 [k] to replace it:
a. Remove front cover of the circuit breaker.
b. Disconnect the closing coil from the wire harness.
c. Remove two bolts holding closing coil assembly to base pan and
drop the closing coil out of the bottom of the circuit breaker.
d. Insert new closing coil assembly into the circuit breaker from below,
bolt it in place and connect into the wiring harness.
No adjustment is required.
e. Close circuit breaker several times electrically to insure that coil is functioning properly.
f. Replace front cover.
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
39
IB-50030B
PowlVac® Type PVDH Circuit Breaker
4. Primary Shunt Trip Coil Assembly
This assembly (fig 4[e]) is located in the center part of the mechanism area,
just to the left of the main closing spring.
a. Remove front cover of circuit breaker.
b. Disconnect the trip coil from the wiring harness.
c. Remove the two bolts holding the trip coil assembly to the circuit
breaker frame and remove the assembly.
d. Bolt the new assembly in place and connect into the wiring harness.
e. With the circuit breaker mechanism in the reset position, check the gap between the trip coil
armature and the trip lever extending from the trip shaft. This gap should be between 1/4 inch
and 5/16 inch. If necessary, bend the trip lever slightly to achieve this setting.
f. Trip the circuit breaker electrically several times to insure that coil is functioning properly.
g. Replace front cover.
5. Secondary Shunt Trip Coil Assembly
This assembly is located in the center part of the mechanism area, just to the right of the main closing
spring. The replacement procedure is identical to that of the primary shunt trip coil, with the following
additional information:
Note: It will be easier to remove the trip coil assembly if the right hand main operating spring
connecting rod is removed. See section headed “Closing Spring Removal and Slow Closing of
Mechanism” under Maintenance in this instruction bulletin for removing this connecting rod.
6. Undervoltage Device Assembly
This assembly is located in the center part of the mechanism area, just to the
right of the main closing spring.
a. Remove front cover.
b. Remove right hand main operating spring connecting rod. See section
headed “Closing Spring Removal and Slow Closing of Mechanism” under
Maintenance in this instruction bulletin for procedures for removing this rod.
c. Disconnect the undervoltage device from the wiring harness.
d. Remove the two bolts holding the undervoltage device assembly to the circuit
breaker frame and remove the assembly.
e. Bolt new assembly in place.
f. Reassemble the main operating spring connecting rod.
g. While the undervoltage device has been tested at the factory, it is necessary to check and possibly
adjust its settings once it has been assembled to the circuit breaker. This will require a variable voltage
DC source capable of output of from 40% to 100% of the DC rating of the undervoltage device.
Connect this source to the terminals of the undervoltage device coil. Apply a DC voltage of 80% of the
undervoltage coil rating. The undervoltage device should pick up and allow the circuit breaker to close.
Close and trip the circuit breaker several times, using manual or shunt trip, to be sure that the vibration
of circuit breaker operation does not cause the undervoltage device to drop out improperly. If the
device does drop out during this test, rotate the screw at the bottom of the device to the right in 1/8-turn
steps until proper operation is obtained. This adjustment may be fine turned by bending the tab at the
base of the beam spring up in 1/8-inch steps. Check dropout of undervoltage device by reducing test
voltage to 52-56%. The undervoltage device should drop out and cause the circuit breaker to trip in
this voltage range. If dropout voltage is too low, bend the tab at the base of the beam spring down
slightly to raise the voltage.
h. Disconnect the test source and connect the undervoltage device into the wiring harness.
i. Replace front cover.
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POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
PowlVac® Type PVDH Circuit Breaker
IB-50030B
7. Charging Motor Assembly
The charging motor assembly is located at the lower right hand side of the
mechanism See figure 4 [t] to replace it:
a. Remove front cover of the circuit breaker.
b. Disconnect the motor from the wiring harness.
c. Remove the two bolts holding the motor mounting bracket to the base
pan and slide the motor to the right, disconnecting the motor shaft from the mechanism, and lift the
motor out.
d. Lubricate the end of the shaft of the new motor liberally with Rheolube 368A grease.
e. Position the new motor assembly in the circuit breaker, being sure that the pin on the end of the drive
shaft engages the slot in the mechanism shaft.
f. Bolt the motor to the base pan and connect it into the wiring harness.
g. Operate the circuit breaker several times to insure that the motor operates smoothly.
h. Replace the front cover.
8.
Anti-Pump Relay Assembly
This relay is located near the top of the mechanism, to the right of
the opening springs.
a. Remove the front cover of circuit breaker.
b. Disconnect the wires from anti-pump relay assembly, being
careful to note which wires go to which terminal.
c. Remove the mounting screws of the mounting bracket of the
assembly and remove the assembly from the circuit breaker.
d. Remove the anti-pump relay from the mounting bracket by removing the retaining clip from the
anti-pump relay.
e. Insert the new anti-pump relay back into the mounting bracket, and fasten the retaining clip to
the anti-pump relay.
f. Reconnect all wires to the proper terminals of the relay.
g. Relays in 250VDC closing circuits are provided with dropping resistors to apply the proper
voltage to the relay coil. The resistor is mounted adjacent to the relay. It may be replaced by
disconnecting it from the relay and unscrewing the mounting feet from the circuit breaker frame,
replacing the resistor and reassembling.
h. Operate the circuit breaker several times to insure the relay functions properly.
i. Replace the front cover.
9. Latch Check Switch Assembly
The latch check switch is located on the left-hand side of the main
mechanism frame, near the bottom of the main closing spring.
See figure 4 [q] to replace it:
a. Remove front cover of circuit breaker.
b. Remove two screws holding switch to mechanism. Do not loosen
the nut plate into which these screws are threaded.
c. Disconnect wires from switch.
d. Connect wires to new switch and fasten switch in place with screws and nut plate previously
removed.
e. Adjust switch see the instructions in section headed “Adjustment of Primary and Secondary Trip
Latches and Latch Check Switch” under MAINTENANCE in this instruction bulletin.
f. Operate circuit breaker electrically several times to insure that it is working.
g. Replace front cover.
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
41
IB-50030B
PowlVac® Type PVDH Circuit Breaker
10. Motor Cutoff Switch Assembly
The motor cutoff switch assembly is located of the floor pan of the
mechanism area, just to the right if the main mechanism. See figure 4 [u] to
replace it:
a. Remove front cover of circuit breaker.
b. Disconnect wires from switch, being careful to identify each wire by the
terminal number from which it was removed.
c. Remove the two bolts holding the assembly to the circuit breaker floor pan and remove assembly.
d. Install new cutoff switch assembly; bolt it to the floor pan. Reconnect the wiring. No adjustments are
needed.
e. Operate the circuit breaker electrically several times to insure that it is working.
f. Replace front cover.
11. Auxiliary Switch Assembly
The auxiliary switch is located on the lower left front of the mechanism area.
See figure 4 [d] to replace an auxiliary switch:
a. Remove front cover of circuit breaker.
b. Disconnect wires from switch, being careful to identify each wire by the
terminal number from which it was removed.
c. Remove the “E” ring securing the switch operating arm to the operations counter linkage.
d. Remove the two screws holding the auxiliary switch to its mounting bracket, and remove the switch.
e. Insert new switch and attach it to the mounting bracket with the two screws removed in step d.
f. Insert the operating arm of the switch in to the hole in the end of the operations counter linkage and
secure with the “E” ring removed in step c.
g. Reconnect the wiring. Be sure wires are connected to the same terminals from which they were
removed.
h. Operate circuit breaker electrically several times to insure that it is working.
i. Replace front cover.
42
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
PowlVac® Type PVDH Circuit Breaker
IB-50030B
Vll. ANNEX
A. COMMISSIONING FOR REPLACEMENT CIRCUIT BREAKERS
It is essential that both classroom and hands-on equipment training accompany any installation of
a new replacement, retrofill, or retrofit circuit breakers. The operator and maintenance technicians
must be trained in all tasks, which they are expected to perform task relating to operation and
maintenance of the equipment. They must also be trained in how the circuit breaker must properly
interface with the existing metal-clad switchgear.
In addition to training, a check out must be performed to confirm that the circuit breaker was not
damaged in shipment, and is compatible with the existing cell. During this check out, adjustments
may be required to match the two devices.
A physical inspection and mechanical checkout of the circuit breaker and cell must be performed
to confirm that the new circuit breaker’s nameplate is consistent with the existing metal-clad
switchgear rating, and that the circuit breaker and cell are functioning separately. Typically, these
tests should include all tests recommended in the circuit breaker manufacturer’s instruction
bulletin. As a minimum, the circuit breaker should undergo an inspection, functional checks, a
circuit breaker timing test, and a vacuum integrity test (with a vacuum integrity tester or an ac high
potential tester). Moreover, a high potential test of the circuit breaker is required to assure phase to
phase and phase to ground dielectric integrity. Once these checks are completed, confirm that the
replacement breaker properly racks into and out of the cell.
The replacement circuit breaker has been designed to be compatible with the existing cell, but
checks must be made to fit the circuit breaker with the specific metal-clad switchgear compartment.
For example, this may require the adjustment of the front cover to minimize gaps and overlaps. Once
the replacement circuit breaker cover matches up to the existing equipment, the ground shoe (connection) and primary disconnects should be checked to confirm that the circuit breaker is engaging
the metal-clad switchgear fully. To confirm the circuit breaker’s engagement, apply a very thin layer
of the manufacturers recommended stab grease to the circuit breaker’s connections. De-energize
the metal-clad switchgear and rack the replacement circuit breaker in and out of the cell without
closing the circuit breaker. Inspect the primary stabs and the ground shoe (circuit breaker ground
connection) for uniform distribution of the lubricant. If the metal-clad switchgear can remain deenergized for the time needed, the insertion test can be followed by a ductor test (dc resistance test)
from the line side to load side of each cell. With the circuit breaker installed and closed, confirm
resistance and assure that the primary disconnects are in good contact with the metal-clad
switchgear compartment. This step is impossible if the metal-clad switchgear cannot be de-energized, but it is important to remember that the circuit breaker primary disconnects are only part of the
total current path. Even though the circuit breaker may be in “new” condition, if the contact surfaces
in the metal-clad switchgear are dirty or corroded the resulting connection between the circuit
breaker and metal-clad switchgear may be highly resistive. Consequently, this will lead to the overheating of the connection, and a possible premature failure of the connection. Once the ground shoe
connection and primary disconnects have been checked, the secondary control disconnect should
be checked to confirm that the metal-clad switchgear secondary disconnect engages properly and
that the metal-clad switchgear compartment wiring matches the replacement circuit breakers.
The control wiring of some of the older solenoid operated circuit breakers and metal-clad switchgear
may need modification in order for the new, stored-energy mechanism to operate properly. Some
equipment designs and control schemes do not have a steady-state control voltage available at the
secondary disconnect that is required for the stored energy feature to operate. This is predominately
true for designs that have the closing, or “X” relay mounted in the metal-clad switchgear compartment. In the external closing relay designs, the closing power was only applied momentarily to the
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
43
IB-50030B
PowlVac® Type PVDH Circuit Breaker
circuit breaker, simply long enough for the circuit breaker to close and latch. Normally the power is removed
upon completion of the closing operation by the action of a circuit breaker’s mounted cutoff switch that
deenergizes the “X” directly, or energizes the anti-pump, or “Y” relay which in turn deenergizes the “X.” The
preferred method for supplying the required charging power to the circuit breaker is the use of unused spare
auxiliary contact secondary disconnects. The ultimate goal in a multi unit replacement is to identify a common
terminal in all circuit breaker compartments in order to maintain interchangeability between the replacement
circuit breakers themselves, and also between the old circuit breakers if interchangeability with the existing
circuit breaker is required. If this cannot be achieved, a blocking or rejection feature must be added or modified to prevent interchange of the circuit breakers. It has also been a field practice to install a jumper around
the normally open “X” contact to supply steady state power to the circuit breaker. If this is done, inserting the
original circuit breaker into the modified compartment may result in the unintentional closing of the circuit
breaker. This presents a hazardous condition that must be avoided by modifying the blocking or rejection
features to prevent insertion of the old circuit breaker into the modified compartments.
It should also be noted that most of the old solenoid operated circuit breakers requires substantially higher
current to operate than that of the requirements of a replacement circuit breaker. This means that the control
fuses in the closing circuit were normally 60 amps or greater. It is also prudent to protect the charging motor
circuit with fuses appropriate for this load. These fuses can either be integral to the replacement circuit
breaker, or located upstream in the metal-clad switchgear cubicle.
The original circuit breaker may also have tripping current requirements far above the requirement of the
replacement circuit breaker. These trip coils were normally wound with larger wire in order to accommodate
the higher current. Due to the higher thermal capability of these coils, fairly high trickle currents flowing in
these coils for healthy coil monitoring could be tolerated without damage to the coil or any negative impact
on circuit breaker operation. This may not be the case with the replacement circuit breaker. In a worst case,
excessive current flowing through the trip coil may overheat the coil or cause partial operation of the coil.
Either of these may negatively affect proper circuit breaker operation. Control circuit coordination of the new
replacement circuit breaker and the old circuit breaker must be carefully considered in cooperation with the
user and manufacturer in order to assure long-term proper operation of the replacement circuit breakers.
Also, relay target setting should be reviewed to insure that the targets will operate by the reduced trip current
of the new circuit breaker.
The last step is to confirm that the circuit breaker operates the cell’s MOC and TOC switches properly, and
that the circuit breaker’s cell interlocks work properly.
Once the MOC and TOC switch have been verified, the insertion and withdrawal interlock functions must be
verified. Although these interlocks are normally adjusted and checked at the factory, the existing compartment may not be within originally specified tolerances. Deviation from originally specified dimensions may be
due to wear, original installation deviations to specification, or field modifications made throughout the
service life of the equipment. Adjustments may be required to the circuit breaker and/or the compartment to
ensure proper operation of these critical interlocks. For further details, contact Powell Electrical
Manufacturing Company.
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POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
PowlVac® Type PVDH Circuit Breaker
IB-50030B
Table V. Trouble Shooting Topics
Problem
Mechanism does not charge
automatically
Breaker will not close
Breaker will not trip
Breaker closes and instantly
opens
Possible Cause
Reason & Remedy
No Control Voltage
Improper wiring or missing fuses in control circuit.
Replace fuses or correct wiring and verify control
voltage at secondary disconnect.
Secondary disconnect
Secondary disconnect not seated properly.
Ensure proper connection of secondary disconnect.
Circuit breaker internal control Circuit breaker internal control circuitry not completed.
Refer to the circuit breaker's control schematic
to verify proper operation of all internal components.
Verify the integrity of the control wiring.
No control power at closing Control power not present at closing coil.
coil
Verify operation and integrity of all control devices
and wiring.Repair and replace defective control
devices and wiring as necessary.
Close latch
Close latch not properly adjusted or lubricated.
Adjust closed latch properly and lubricate.
See Mech. Adj., section
No control power at closing Control power not present at closing coil.
coil
Verify operation and integrity of all control devices
and wiring. Repair and replace defective control
devices and wiring as necessary.
Lubrication
Circuit breaker lacks lubrication within the mechanism
area.
Lubricate the circuit breaker as needed. See the
maintenance section for proper lubrication methods
shown in your instruction bulletin.
Protective devices
Fault in HV power circuit and protective relay functions
tripping breaker.
Check circuit and remove fault.Nuisance tripping from
protective relays.Adjust protective device
parameters.
Manual trip linkage
Manual trip linkage binding and not allowing opening cam
to fully reset.
Check opening cam for free movement and travel.
Cam should reset and seat on roll pins against
opening cam housing.
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
45
Index
A,B
L
R
Adjustments
close latch 29
latch check switch 29
primary and secondary trip latches 29
ratchet wheel holding pawl 29
Anti-pump relay 18
Levering-in device 11
Levering-in interlock 16
Lubrication
description 27
illustrations 31, 32
table 30
C, D
M, N
Cam and fundamental linkage positions 13
Cell interlocks 17
Circuit breaker
inserting into switchgear 24
Control circuit
operation sequence 19
typical DC control scheme 18
Control devices
replacement assemblies 36
Ground contact 11
Maintenance
description 26
inspection and cleaning 27
Maintenance schedule 26
Mechanism and trip linkages 13
Mechanism area
adjustments 29
description 27
electrical operation 29
lubrication 27
main closing spring installed 28
main closing spring removed 28
mechanical operation 27
slow closing of mechanism 28
MOC actuator 16
Motor cutoff switch 17
Renewal parts
control devices 36
description 35
miscellaneous parts 37, 38
ordering instructions 35
sliding contact finger assembly 36
vacuum interrupter assembly 36
Replacement procedures
anti-pump relay assembly 41
auxiliary switch assembly 42
charging motor assembly 41
closing coil assembly 39
latch check switch assembly 41
motor cutoff switch assembly 42
primary shunt trip coil assembly 40
secondary shunt trip coil assembly 40
sliding contact finger assembly 39
undervoltage device assembly 40
vacuum interrupter assembly 39
Rollout truck 11
I, J, K
O
Installation
handling 20
receiving 20
storage 20
Instruction bulletin
conflict with other documents 5
other items of caution 5
purpose 5
scope 5
website information 6
Interlocking
cell interlocks 17
levering-in lnterlock 16
Operating solenoids 17
Optional maintenance procedures
high potential tests 34
primary resistance check 34
E, F
Electrical operation 29
G, H
P, Q
Powell Apparatus Service Division
6, 26, 35
information 22
Powell Electrical Manufacturing Company
6
Primary resistance check 34
Putting into service
commissioning 22
control voltage insulation integrity 23
description 22
dimensional check 23
electrical operation 23
high voltage insulation integrity 22
mechanical operation check 23
vacuum integrity 22
PVDH
description 9
exterior components illustrations 12
interior components illustrations 14
S
Safety 6
Safety labels 8
Secondary contacts 11
Shutter rollers 15
Stored energy mechanism 9
T, U
Testing
AC or DC high potential test (hipot)
22, 23
Trouble shooting topics 45
V
Vacuum interrupter and contact area
vacuum integrity 33
vacuum interrupter contact erosion 33
Vacuum interrupter contact erosion
sliding contact finger wear 33
Vacuum interrupters 17
W
Website 6, 35
X
“X” relay 43
X-rays 7
Y, Z
“Y” relay 44
46
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
Notes
POWELL ELECTRICAL MANUFACTURING COMPANY, HOUSTON, TEXAS, USA
47
Revision B – November 2001
POWELL ELECTRICAL MANUFACTURING COMPANY
8550 MOSLEY DRIVE · HOUSTON, TEXAS 77075 USA
PHONE (713) 944-6900 · FAX (713) 947-4453
www.powellelectric.com
www.powellservice.com
©2001 POWELL ELECTRICAL MANUFACTURING CO.
All Rights Reserved.