GE Industrial Solutions PowerVac 5kV VL PV VL 4.16-250-0 User Manual
g
DEH 40012
GE PowerVac ® 5kV VL
for PowerV ac ® V acuum Circuit Breakers
Type PV VL 4.16-250-0
with ML-19 Mechanism
Instructions
1
DEH-40012
WARNINGS, CAUTIONS AND NOTES
AS USED IN THIS PUBLICATION
This document is based on information available at the time of this publication. While effor ts have
been made to ensure accuracy, the infor mation contained herein does not cover all details or variations in hardwar e and softwar e, nor does it provide for every possible contingency in connection
with installation, operation, and maintenance. Features may be described herein that are not
present in all hardware and software systems. GE Industrial Systems assumes no obligation of
notice to holders of this document with respect to changes subsequently made.
WARNINGS
Wa rning notices are used in this publication to emphasize that hazar dous voltages,
cur rents, or other conditions that could cause personal injur y or death ar e present
in this equipment or may be associated with its use.
W ar ning notices ar e also used for situations in which inattention or lack of equipment knowledge could cause either personal injury or damage to equipment.
CAUTIONS
Caution notices are used for situations in which equipment might be damaged if
care is not taken.
NOTES
Notes call attention to information that is especially significant to understanding
and operating the equipment.
GE Industrial Systems makes no repr esentation or war ranty, expressed, implied, or statutor y , with
respect to, and assumes no responsibility for the accuracy completeness, sufficiency, or usefulness of the information contained her ein. No warranties of mer chantability or fitness for purpose
shall apply.
The following is a trademark of GE Company: PowerV ac
®
© 2000 GE Company
All Rights Reserved
2
PowerV ac ® 5kV Vertical Lift
Table of Contents
Chapter 1. Introduction
1-1 Safety ...................................................................................................................... 6
1- 2 Maintenance ........................................................................................................... 6
Chapter 2. Description....................................................................................................................7
Chapter 3. Receiving, Handling & Storage
3-1 Receiving ................................................................................................................ 8
3-2 Handling .................................................................................................................. 8
3-3 Storage .................................................................................................................... 8
3- 4 Safety Precautions ..................................................................................................8
3- 5 Unpacking the Breaker ............................................................................................ 8
3- 6 Safety Interlocks......................................................................................................9
Positive Interlock System .......................................................................................9
Interference Bolts ..................................................................................................10
Chapter 4. Installation
4- 1 Breaker Preparation ...............................................................................................11
4- 2 Equipment Test Position .......................................................................................11
4- 3 Positive Interlock System .................................................................................... 11
4- 4 Checking for Pr oper Interlock ............................................................................... 12
4- 5 Primary Contact Penetration ................................................................................. 14
4- 6 Stationary Auxiliar y Switch (MOC)....................................................................... 1 6
4-7 Stops......................................................................................................................16
4- 8 Ground ...................................................................................................................16
4- 9 Secondary Coupler................................................................................................ 17
4-10 Position Switch .....................................................................................................17
Chapter 5. Operation
5-1 Description ............................................................................................................ 18
5-2 Close Spring Charging ....................................................................................... 19
5- 3 T rip-Free Operation .............................................................................................. 20
5- 4 Closing Operation ................................................................................................. 2 0
5- 5 Opening Operation................................................................................................ 2 1
Chapter 6. Control Cir cuit
6- 1 Typical Wiring Controls ........................................................................................2 2
Chapter 7. Mechanical Check and Slow Close
7-1 Visual Inspection .................................................................................................. 25
7-2 Closing Spring Charging...................................................................................... 25
7-3 Closing Spring Gag ..............................................................................................25
7-4 Slow Closing ......................................................................................................... 25
7- 5 Gag Tool Removal ................................................................................................. 2 5
Chapter 8. Dimensional Checks
8- 1 Primary Contact Er osion ....................................................................................... 26
8- 2 Spring Wipe Indicator .......................................................................................... 26
8- 3 Contact Gap........................................................................................................... 2 7
3
PowerV ac® 5kV Vertical Lift
Table of Contents
Chapter 9. Electrical Checks
9- 1 Electrical Operation............................................................................................... 28
9- 2 High Potential Test ................................................................................................ 28
Primary Cir cuit....................................................................................................... 2 8
Secondary Cir cuit.................................................................................................. 28
9- 3 Primar y Cir cuit Resistance.................................................................................... 28
9- 4 V acuum Integrity T e st............................................................................................ 28
9-5 Insulation T ests .....................................................................................................29
Chapter 10. Maintenance
10-1 General ..................................................................................................................30
10-2 Service Conditions ................................................................................................ 31
10-3 Fault Interr uptions .................................................................................................31
10-4 Contact Erosion..................................................................................................... 3 1
10-5 Transfer Finger W ear............................................................................................. 3 1
10-6 Mechanism ............................................................................................................ 31
10-7 Primary Insulation Par ts........................................................................................ 3 1
10-8 Lubrication ............................................................................................................ 32
10-9 Recommended Maintenance ................................................................................ 32
10 -1 0 Breaker Timing and Speed Check ........................................................................ 32
Chapter 11. Mechanical Adjustments
11-1 General ..................................................................................................................35
11-2 Wipe Adjustment................................................................................................... 35
11-3 Contact Gap Adjustment....................................................................................... 3 6
11-4 Trip Coil Plunger................................................................................................... 37
11-5 Close Coil Plunger ................................................................................................ 38
11-6 Control Switch Adjustment .................................................................................. 3 9
11-7 Adjustment of MOC Switch ..................................................................................39
11-8 Positive Interlock................................................................................................... 40
Chapter 12. Repair and Replacement
12-1 General ..................................................................................................................44
12-2 Replacing Interr upters...........................................................................................44
12-3 Primary Bushing.................................................................................................... 4 5
12-4 Mechanism ............................................................................................................ 45
12-5 Contr ol Switches................................................................................................... 45
12-6 Trip Coil Replacement .......................................................................................... 45
12-7 Closing Coil Replacement .................................................................................... 47
12-8 Auxiliary Switch Replacement.............................................................................. 47
12-9 Motor Replacement............................................................................................... 49
12 -1 0 “Y” Relay Replacement ........................................................................................49
Chapter 13. Renewal Parts
13-1 Ordering Instructions............................................................................................ 51
Chapter 14. Stationary Cubicle Subassembly
14-1 Introduction ........................................................................................................... 53
14-2 Major Components ............................................................................................... 53
14-3 Testing and Inspection.......................................................................................... 5 4
14-4 Compartment Maintenance................................................................................... 58
4
List of Figur es
1. View of the 5kV ‘VL’ Breaker with Front Cover ............................................................................... 7
2. Hooking lifting eyes........................................................................................................................... 8
3. Manual Trip & Close .......................................................................................................................... 9
4. Positive Interlock ............................................................................................................................... 9
5. Rating Interference Bolt .................................................................................................................. 10
6. Positive Interlock system ................................................................................................................ 12
7. Manual char ge handle..................................................................................................................... 13
8. Primar y Contact Inser tion ............................................................................................................... 14
9. Primar y contact penetration and wipe........................................................................................... 15
10. MOC switch...................................................................................................................................... 16
11. Secondary disconnect coupler........................................................................................................ 17
12. Front View of ML-19 Mechanism with Front Cover Removed ..................................................... 18
13. Char ging & Trip system left side view ............................................................................................ 19
14. Manual Char ging system right side view.......................................................................................19
15. Electrical Char ging system right side view .................................................................................... 20
16. Closing linkage left side view.......................................................................................................... 20
17. Opening spring & auxiliary switch left side view........................................................................... 21
18. Wipe Spring assembly left side view ............................................................................................. 21
19. T ypical ML-19 mechanism internal wiring connections ................................................................ 22
20. T ypical breaker wiring diagram (Replacement for br eakers with MS mechanisms................... 23
21. T ypical br eaker wiring diagram (Replacement for breakers with ML mechanisms ................... 24
22. Closing spring with gag tool inserted ............................................................................................. 25
23. Contact Er osion Indicator ................................................................................................................ 26
24. Primary contact erosion measurement-rear view ........................................................................ 26
25. Wipe indicator check and wipe measurement-rear view ............................................................. 27
26. Sample Operating Speed Graphs .................................................................................................. 33
27. Opening Speed Adjustment............................................................................................................ 33
28. Travel Transducer Installation (Part#0144D1235G00X) ............................................................... 34
29. Wipe Insulator.................................................................................................................................. 35
30. Contact Gap Adjustment—Opening Buffer.................................................................................... 36
31. Contact Gap measurement, wipe indicator check and wipe measurement ................................ 36
32. T rip coil gap adjustment .................................................................................................................. 37
33. T rip coil button with gage................................................................................................................ 37
34. T rip coil assembly............................................................................................................................ 37
35. Close coil assembly-fr ont view ....................................................................................................... 38
36. Close coil gap adjustment-fr ont view ............................................................................................. 38
37. SM/LS & CHG switch adjustment-left side view............................................................................ 39
38. CL/MS and positive Interlock switch adjustment-right side view ................................................. 39
39. Positive Interlock ............................................................................................................................. 40
40. Adjustment of MOC Switch/Plunger Interlock................................................................................ 41
41. Toggle Linkage Positions ................................................................................................................. 42
41A T oggle Linkage Positions (View fr om Right Side) .......................................................................... 42
42. T oggle Linkage Positions (View from Right Side) .......................................................................... 42
42A T oggle Linkage Positions (View fr om Right Side) .......................................................................... 42
43. Pole Assembly ................................................................................................................................. 44
44. T rip Coil and Linkage (Closing Spring Removed) .......................................................................... 46
45. Front View of ML-19 Breaker Mechanism (Lower) ....................................................................... 48
46. Front View of ML-19 Breaker Mechanism (Upper) ....................................................................... 49
47. Motor Cutoff Switch ........................................................................................................................ 50
48. Closing Spring Gag .......................................................................................................................... 50
49. Front View of ML-19 Mechanism with Front Cover Removed ..................................................... 51
50. Schematic of ML-19 Mechanism .................................................................................................... 52
51. T ypical stationar y structur e wiring ................................................................................................. 56
52. Electrical schematic diagram for vertical lift elevating mechanism ............................................ 57
53. Positive interlock M-26 units........................................................................................................... 59
Appendix A .............................................................................................................................................. 63
PowerV ac ® 5kV Vertical Lift
Table of Contents
List of T ables
1. Measurements ....................................................................................................43
2. Adjustments........................................................................................................ 43
3. ML-19 Control Devices and Voltages ................................................................ 47
4. Elevating Motor Troubleshooting......................................................................57
T r ouble Reporting Form.......................................................................................... 66-67
5
PowerV ac® 5kV Vertical Lift
Chapter 1. Introduction
1-1 Safety
IT IS IMPERATIVE THAT ALL PERSONNEL
ASSOCIATED WITH THIS EQUIPMENT READ
AND COMPLETELY UNDERSTAND THE
WARNINGS LOCATED THROUGHOUT THIS
INSTRUCTION BOOK. FAILURE TO DO SO
CAN RESULT IN DAMAGE TO PROPERTY OR
PERSONAL INJURY.
Each user must maintain a safety program for
the protection of personnel, as well as other
equipment, from the potential hazards associated with electrical equipment.
The following requirements are intended to augment the user’s safety program but NOT supplant the user’s responsibility for devising a
complete safety pr ogram. The following basic
industry practiced safety requirements are applicable to all major electrical equipment such
as switchgear or switchboards. GE neither condones nor assumes any responsibility for practices which deviate fr om the following:
1. ALL CONDUCTORS MUST BE ASSUMED
TO BE ENERGIZED UNLESS THEIR POTENTIAL HAS BEEN MEASURED AS TO
GROUND.
Many accidents have been caused by
power system back feeds fr om a wide variety of sources.
2. It is str ongly recommended that all equipment be completely de-ener gized, verified
to be “dead”, then grounded with adequate
capacity grounding assemblies prior to any
maintenance. The grounding cable assemblies must be able to withstand ener gizing
fault levels so that protective equipment
may clear the circuit safely. Additional discussion on this concept is covered in Chapter 20 of ANSI/NFPA 70B, Electrical Equipment Maintenance.
3. Although interlocks to reduce some of the
risks are pr ovided, the individual’ s actions
while performing service or maintenance
are essential to prevent accidents. Each
person’s knowledge; his mental awar eness;
and his planned and executed actions often determine if an accident will occur.
The most important method of avoiding
accidents is for all associated personnel
to carefully apply a thor ough understanding of the specific equipment fr om the viewpoints of its purpose, its construction, its
operation and the situations which could
be hazardous.
1-2 Maintenance
All personnel associated with installation, operation and maintenance of electrical equipment, such as power circuit breakers and other
power handling equipment, must be thor oughly
instructed, with periodic retraining, regarding
power equipment in general as well as the par ticular model of equipment on which they are
working. Instr uction books, actual devices and
appropriate safety and maintenance practices
such as OSHA publications, National Electric
Safety Code (ANSI C2), and National Fire Protection Association (NFPA) 70B Electrical Equipment Maintenance must be closely studied and
followed. During actual work, supervision
should audit practices to assure confor mance.
6
2-1 Description
PowerVac® 5kV Vertical Lift
Chapter 2. Description
The PowerVac® 5kV VL vacuum circuit br eaker
is a vertical lift, r emovable and interchangeable
interrupting element, for use in metal-clad
switchgear to pr ovide pr otection and contr ol of
electrical apparatus and power systems. The
PowerVac 5kV VL Type PV-VL1 circuit breaker
with ML-19 mechanism is available in continuous current ratings of 1200 and 2000 amperes
in accordance with industr y standards.
Refer to the breaker nameplate for complete rating information of any particular breaker. The
nameplate also describes the contr ol power requirements for that br eaker. The application of
a breaker must be such that its voltage, cur rent
and interrupting ratings are never exceeded.
Since this book is written to include all ratings
of the breaker, as well as several design variations, the instructions will be of a general character and all illustrations will be typical unless
otherwise specified.
3
Figure 1. V iew of 5kV ‘VL ’ Br eaker with Front Cover
1 Nameplate 5 Charge/Dischar ge Indicator 9 Manual Charge Lever
2 Cover Mounting Bolts 6 Counter 10 Secondary Coupler
3 Fr ont Removable Cover 7 Manual Trip Button 11 Positive Interlock Roller
4 Open/Close Indicator 8 Manual Close Button 12 Plunger Interlock (MOC)
13 Primary Bushings (1200 Amp shown)
7
PowerV ac® 5kV Vertical Lift
Chapter 3. Receiving, Handling & Storage
3-1. Receiving
Each breaker is carefully inspected before shipment. Immediately upon receipt of the circuit
breaker, an examination should be made for any
damage sustained in transit. If injury or rough
handling is evident, a claim should be filed immediately with the transportation company, and
the nearest GE Sales Office should be notified.
CAUTION: THE BREAKER HAS BEEN
SHIPPED IN THE CLOSED POSITION.
3-2. Handling
It is expected that care will be exercised during
the unpacking and installation of breakers so
that no damage will occur from careless or
rough handling, or from exposure to moisture
or dirt. Loose par ts associated with the breaker
are sometimes included in the same crate. Check
all parts against the packing list to be sur e that
no parts have been overlooked.
3-3. Storage
It is recommended that the breaker be put into
service immediately in its permanent location.
If this is not possible, the following precautions
must be taken to assure the proper storage of
the breaker .
The breaker should be stored in a clean location, free from corrosive gases or fumes. Particular care should be taken to pr otect the equipment from moisture and cement dust, as this
combination has a very cor r osive effect on many
parts.
Breakers should be car efully protected against
condensation, preferably by storing in a war m,
dry r oom of moderate temperature such as 40 to
100° F. High humidity may have an adverse effect on the insulating parts and should be
avoided. Circuit breakers for outdoor metalclad switchgear should be stored in the equipment only when power is available and the heaters are in operation to prevent condensation.
Rollers, latches, etc. of the operating mechanism
should be coated with GE part No.
0282A2048P009 (Mobil 28 red) grease to prevent
rusting.
If the breaker is stored for any length of time, it
should be inspected periodically to see that
corrosion has not started. Should the breaker
be stored under unfavorable atmospheric conditions, it should be serviced befor e being placed
on line.
3-4 Safety Precautions
This circuit breaker uses powerful springs for
ener gy storage. DO NOT WORK ON THE INTERRUPTERS OR THE MECHANISM UNLESS THE
CIRCUIT BREAKER IS IN THE “OPEN” POSITION AND BOTH THE CLOSING AND OPENING
SPRINGS ARE EITHER DISCHARGED OR
GAGGED AND ALL ELECTRICAL POWER IS REMOVED.
The precautions are required to prevent accidental operation. Anyone working on the circuit breaker should be familiar with the contents of this instr uction book.
Figure 2. Hooking lifting eyes
3-5 Unpacking the Breaker
The circuit breaker has been supplied with a
box of maintenance items. After removing the
protective cardboard, locate this package and
remove two each breaker lifting eyes. After removing the cleats that attach the breaker to the
skid, hook the lifting eyes on both sides of the
breaker in line with the front edge of the primary bushing plate at the point of the lifting
arr ows (see Figur e 2). Connect a 1,000 lb. minimum rated chain fall or sling (not pr ovided) to
these lifting hooks and remove the br eaker from
the skid.
Packing List
With your breaker, you should have received:
1. Manual charging handle. (Part No.
0282A7227P001)
2. Gag tool. (Part No. 0209B8043G003)
3. Br eaker Instr uction Book DEH 40012
4. Elemenatary Wiring Diagram per breaker
summary.
5. (1)Tube of GE red grease. (Part No.
0282A2048P010)
6. (2) Breaker lifting hooks . (Part No.
0348A3356P001)
7. (6) MOC adjustment washers. (Part No.
0348A3185P001
8
Chapter 3. Receiving, Handling & Storage
CAUTION: THE CIRCUIT BREAKER HAS
BEEN SHIPPED IN THE CLOSED POSITION.
After removing packing material, open the
breaker by pushing in firmly on the manual trip
button (Figure 2, Item 8), while keeping hands
away fr om moving parts. A safe way to do this
is to push on the trip button with the r ound side
of the maintenaince handle. Verify that the operation counter advances one count.
Figure 3. Manual T rip & Close
Closing and opening springs are now in their
dischar ged positions. Check this by first pr essing the manual close button, then the manual
trip button. The indicator flags on the front of
the breaker should show “OPEN” and
“DISCHGD”.
PowerVac® 5kV Vertical Lift
Figure 4.
Positive
Interlock
A major goal in the design of switchgear has
always been the interchangeabililty of breakers. GE Switchgear has been very successful
in achieving that goal for many years. Analysis of instr uction book adjustments, shop tolerances, and service advice letters issued in
recent years, however, has demonstrated that
tolerances in switchgear equipment installed
and presently operating can change, resulting in situations where it is impossible to meet
all adjustments. Also, when an adjustment
is brought into specification it can cause a
pr oblem with another interface or adjustment.
All mechanical and electrical checks listed in
Chapter 4 should be completed before putting
breakers in ser vice.
3-6 Safety Interlocks
Each PowerVac® VL vacuum circuit breaker is
pr ovided with the following interlocks:
Positive Interlock System
The purpose of the positive interlock is to prevent moving the breaker to or fr om the connected
position while the main contacts are closed, and
to prevent closing the contacts unless the
breaker is in the fully connected position. These
important safety features ar e achieved by means
of the positive interlock roller on the right side
of the breaker and positive interlock cam and
stationary “flag” in the switchgear cell.
Although GE has made every effort to assure
interchangability and satisfactory inter face with
existing equipment. Older equipment and field
modifications that may have been made over
the years, may require additional procedures
before the new vacuum breaker can be installed
in the cubicle. At a minimum, all breaker-toswitchgear interfaces as explained in this section should be verified for pr oper operation prior
to energizing. The interfacing parts on all ratings of type AM breakers are functionally the
same.
The following section defines the essential dimensions relating to the interfacing
elements of the breaker and switchgear,
to assure reliable performance. Some of
these elements also affect the other important interfaces required for reliable operation of the equipment, such as:
1. Positive interlock safety feature.
2. Mechanism operation.
3. Primary disconnect penetration.
4. Secondary coupler penetration.
9
PowerV ac® 5kV Vertical Lift
Chapter 3. Receiving, Handling & Storage
Interfer ence Bolts
This interlock permits only a breaker with a
matching continuous current rating to be inserted into a metal-clad compartment of identical rating. The rating interference bolt has been
assembled to match the current rating of the
compartment. This assembly is done by fastening a bolt on the lower left side of the breaker
truck to align with the proper cubicle interference plate. This bolt should not be removed.
Figure 5.
Figure 5. Rating Inter ference Bolt
10
PowerVac® 5kV Vertical Lift
Chapter 4. Installation
4-1 Breaker Preparation
Prior to interfacing the breaker into the
switchgear cell, rub a small amount of
0282A2048P009 red grease, provided with the
breaker, on the silvered portion of the breaker
studs, gr ound shoe, and 16 secondary coupler
pins, to form a thin coating for contact purposes.
4-2 Equipment Test Position
In most AM breaker Metal-Clad Switchgear
units, there is a breaker “Test Position” which
allows you to functionally test the breaker without connecting to the bus. This position is lowered fully down fr om the br eaker being fully connected into the cubicle. When in the “test position”, a secondary coupler cable must be used
to connect the secondary control circuits for
electrical breaker operation.
While in the test position, the breaker interlock
is not activated. The interlock roller will not
rest in the lower “Vee” notch in the equipment
interlock cam plate allowing the operator to
close and open the breaker electrically or manually (see Figure 6).
The breaker positive interlock system should
be checked while in the test position prior to
elevating the breaker .
WARNING: FAILURE TO PROPERLY VERIFY
ALL BREAKER SWITCHGEAR INTERFACES
AND PROPER POSITIVE INTERLOCK OPERATION COULD RESULT IN A BREAKER OPERATIONAL FAILURE.
4-3 Positive Interlock
The positive interlock system prevents connecting or disconnecting the breaker in the cubicle,
when the breaker is in the closed position and
the vacuum contacts are closed.
the positive interlock r oller and lever are forced
forward by the postitive interlock cam on the
right side of the switchgear cell. The interlock
r oller and lever are held in this for ward position
during raising and lowering operations, preventing the breaker from being closed in any intermediate position between the connect and the
fully lowered position. Any attempt to charge
the breaker will cause the stor ed energy springs
to automatically dischar ge without the br eaker
contacts closing or moving. The breaker must
be fully connected (raised) and the clutch handle
must be released before the breaker can be
closed. Releasing the clutch handle allows the
interlock cam plate in the cell to move downward allowing the interlock roller and lever to
return to their normal vertical positions. The
breaker may then be closed.
The following positive interlock adjustments are
made at the factory and verified for proper operation per Figure 6. The distance fr om the top
of the stationary flag to the top of the switchgear
guide rails is set. This maintains the surface
upon which the breaker wheels rest when the
breaker is lowered. The upper elevating motor
limit switch is then adjusted to achieve a r oller
to flag clearance of 1/16" to 1/8" as shown in
Figure 6. The limit switch de-energizes the elevating motor circuit and should be activated
when the primary disconnects and secondary
coupler reach their nominal contact penetration
position. If the timing of this sequence is off,
the cell must be adjusted back to factory specifications.
T ypical instructions for making adjustments to
the cell positive interlock cam as pr ovided with
the original equipment are outlined in Figure 6
and Figure 53.
This interlock feature is accomplished by a r oller
and lever located on the interlock shaft, on the
right side of the breaker. (Figures 1, 4 and 6)
The positive interlock lever (roller) provides a
trip-free and discharged condition when racking the breaker in the connected or disconnect
position. When the breaker is raised or lowered,
11
PowerV ac® 5kV Vertical Lift
Chapter 4. Installation
(-0, + 1/16”)
Figure 6. Positive Interlock system
4-4 Check for Proper Interlock
and Trip-free Functions Before
Energizing the Breaker
WARNING: THE PRIMARY EQUIPMENT
SHOULD BE COMPLETELY DE-ENERGIZED
WHILE THE TESTS ARE IN PROGRESS.
DO NOT INSTALL OR REMOVE THE
BREAKER OR MAKE ADJUSTMENTS UNLESS THE BREAKER IS OPEN.
T o test the function of the positive interlock system and trip free function, the following checks
should be made:
1. Verify that red gr ease has been r ubbed on
the silvered portion of the breaker studs,
ground shoe, and 16 secondary coupler
pins, forming a thin coating for contact
purposes.
2. Before inserting the New VL vacuum
breaker into the cubicle, verify the cubicle
interlock position by measuring the distance between (Figure 6) the movable positive interlock cam to the back of the lifting
saddle of the racking mechansim. This distance should be 10 7/8” minus 0, plus
1/16”.
12
3. Lower the elevating mechanism lifting
brackets until the lifting brackets are in the
fully lowered position. The breaker should
then enter the housing freely. After first
assuring that the breaker is in the open
position, push the breaker into the unit until
it rests against the rear of the front lifting
saddle of the elevating mechanism.The
clearance between the interference block
on the breaker and the interference block
on the interlock mechanism should be fr om
.063" to .125".
4. With the breaker in the lowered position,
the positive interlock r oller engages in the
lower Vee notch, in the interlock cam plate.
The br eaker should be in the opened position and the closing springs discharged
as indicated by the flag indicators. (Figure
1, items 4 and 6) Using the manual char ging handle, char ge the breaker. Then close
the breaker and recharge. (Figure 7, Item
1). With the elevating motor switch in a
neutral position engage the clutch to verify
the operation of the positive interlock. The
springs will dischar ge and the breaker will
open.
NOTE: TABLE 3, FIGURES 6, 52, 53, AND
54 HAVE BEEN PROVIDED TO FAMILIARIZE THE OPERATOR WITH THE EQUIPMENT RACKING SYSTEM AND TROUBLESHOOTING.
PowerVac® 5kV Vertical Lift
Chapter 4. Installation
WARNING: AGAIN, BEFORE PROCEEDING
WITH THIS CHECK, IT IS NECESSAR Y THAT
THE PRIMAR Y CIRCUITS BE DE-ENERGIZED.
2
1 Manual char ging handle
2 Positive interlock
Figure 7. Manual char ge handle
WARNING: DO NOT A TTEMPT TO MANUALLY
CHARGE A CHARGED BREAKER. TO DO
SO COULD DAMAGE THE CHARGING
CLUTCH AND MAKE THE MANUAL CHARGING FEATURE INOPERABLE.
5. Raise the breaker to the connect position.
This can be done manually with an elevating wrench or electrically with an elevating motor pr ovided with the original equipment.
CAUTION: THE MOTOR RAISE/LOWER SE-
LECTOR SWITCH MUST NOT BE USED TO
ENERGIZE OR INTERRUPT MOTOR CIRCUIT
AT ANY TIME.
7. When the breaker is fully elevated, the clear ance between the breaker lifting rail and
the upper stop bolts should not be more
than .125" and not less than .094".
8. The positive interlock roller should be centered in the upper “VEE” and the interlock
roller should have 1/16" clearance to the
stationary plate dir ectly under it.
9. In order to lower the breaker fr om the connected position, the breaker should be
open. The closing springs will be discharged when the clutch handle is engaged.
To lower the breaker, place the elevating
control selector switch on the elevating
motor to “lower”. A clutch handle in back
of the elevating motor is then pulled forward until a limit switch engages, to lower
the breaker to the bottom of the cubicle.
10.To raise or lower the breaker, the clutch
must be held in the engaged position, otherwise a spring will return it to its disengaged position and open the electrical cir cuit to the motor.
CAUTION: THE POSITIVE INTERLOCK LE-
VER ROLLER WILL DISCHARGE THE OPENING AND CLOSING SPRINGS AS THE ELEV ATING MOTOR CLUTCH IS ENGAGED.
To elevate the breaker, first–verify the
breaker is in the open position and the closing springs are discharged. Place the elevating control selector switch on the elevating motor to “RAISE”. A clutch handle
under the elevating motor is then pulled
forward until a limit switch engages to raise
the breaker into the unit. Carefully raise the
breaker and while elevating, note that the
shutter slides open and the breaker studs
center with respect to the openings in the
stationary disconnecting devices or damage to the contacts may result.
6. Hold the clutch handle in the forward position until a limit switch on the structure
opens to stop the motor at the end of the
upward travel of the breaker. The springs
will charge when the clutch handle is released.
11. The breaker may be raised or lowered by
an emergency hand crank which can be
inserted after r emoving the motor . The motor is removed by unlatching the motor
assembly fr om its support and disconnecting the motor lead plug. After removing
the motor, inser t the manual crank and pull
the clutch forward. Rotate the crank until
the coupling engages the clutch. The
clutch handle will be held in the down
position by a latch on the crank assembly .
The breaker must be open before the crank
can be inserted and held in the clutch coupling.
13
PowerV ac® 5kV Vertical Lift
Chapter 4. Installation
When the breaker is in the fully elevated and in
the connected position, releasing the motor
operating handle will return the positive interlock r oller into the upper Vee notch in the inter lock cam plate. The breaker positive interlock
switch will close and ener gize the motor char ging circuit allowing the closing spring to
char ge. The br eaker may now be closed.
In order to lower the breaker fr om the connected
position, the breaker should be opened. If the
breaker has not been opened, operating the
motor elevating clutch will open the contacts
and discharge the springs.
4-5 Primary Contact Penetration
After completing the Positive Interlock and trip
free functional checks, lower the break and withdraw it from the cell. Inspect the contact surfaces of both the breaker studs and the stationary disconnecting devices. The primar y disconnect devices utilize silver to silver contacts to
insure against r eduction of cur r ent car r ying capacity due to oxidation of the contact surfaces.
These contacts are of the high pressure line
contact tube and socket design, the tube being
backed up by heavy garter springs.
1. Each segment of the stationary disconnecting device should make a heavy impression in the contact lubricant on the
breaker studs as shown in Figure 9. Contact wipe should start not less than .125"
from the top of the contact ball, although
each contact need not start at the same
location.
2. The penetration of the breaker stud inside the stationary disconnecting device,
as indicated by the contact lubricant,
should be 3/4” to 7/8” as shown in Figure 9. This indicates that the breaker studs
contacted at the full pressure center of
the silver band on the stationary disconnecting device corr ectly.
3. Should the inspection of the contacts
show that the breaker is not being raised
to the proper position, readjust the upper stop bolts and limit switches to raise
or lower the breaker to the proper location (See Figure 6 and 53). Lock the stop
bolts in the new position.
4. If proper contacting cannot be attained
by the above methods, additional adjustments may be necessary.
Contact the local GE Sales Office for factory
assistance.
Figure 8. Primary Contact Insertion
14
Final
Position
1/2” to 5/8”
Electrical
Wipe
Initial
Electrical
Contact
PowerVac® 5kV Vertical Lift
Chapter 4. Installation
3000A Contact
Wipe area should
be a minimum of
60% contact width
3/4” to 7/8”
1200A & 2000A
Contact Wipe
should be a line
1/16” to 1/8”
wide.
(grease wipe)
9 3/4 M 36
8 3/16 M 26
12 3/4 M 36HH
T ravel
Figure 9. Primary contact penetration and wipe
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PowerV ac® 5kV Vertical Lift
Chapter 4. Installation
4-6 Stationary Auxiliary Switch
(MOC)
The Stationary Auxiliar y Switch is a Mechanism
Operated Contact (MOC) which is an optional
switch mounted in the switchgear cell. When
the breaker has been elevated to the fully connected position, the MOC switch will be actuated whenever the breaker is closed. The MOC
switch is actuated by the plunger mounted on
the top of the breaker mechanism. (Figure 10
Item 1). The MOC switch has a number of “a”
contacts (closed when the breaker is closed and
open when the breaker is open) and “b” contacts (open when the breaker is closed and
closed when the breaker is open).
The following paragraph defines the essential
dimensions relating to the interfacing elements
of the beaker and switchgear, to assure r eliable
performance.
The following elements are important factors
which commonly affect the operation of the stationary auxiliar y switch.
1. Adjustment
washer
2. Operating
switch rod
1. Plunger travel on the br eaker .
2. The gap between the top of the plunger
on the breaker and the bottom of the r od
on the stationary auxiliar y switch mechanism.
3. V ariations between breakers in the distance
from the underside of the lift rail and the
top of the plunger .
4. Variations in the r otation requir ements to
“make” and “break” the stationar y auxiliary switch contacts.
5. Condition of the plunger interlock components on the breaker .
6. Elevating mechanism limit switch consistency.
7. Break elevating mechanism positive stops.
8. Seismic events.
Some of these elements also affect the other
important inter faces requir ed for r eliable operation of the equipment, such as:
1. Primar y disconnect penetration.
2. Secondar y coupler penetration.
3. The positive interlock mechanism.
A major goal in the design of switchgear has
always been the interchangeability of breakers.
GE Switchgear has been very successful in
achieving that goal for many years. Analysis of
instr uction book adjustments, shop tolerances,
and service advice letters issued in r ecent years,
however , have demonstrated that tolerances in
switchgear equipment installed and presently
operating can result in situations where it is
impossible to meet all adjustments or that an
adjustment is br ought into specification and it
causes a pr oblem with another interface.
Figure 10. MOC switch
3. Plunger
interlock
4-7 Stops
The stop pins and stop bolts on the elevating
mechanism are emergency mechanical stops
which would come into use only if the upper
elevating motor switch is completely out of adjustment or has failed. Elevating against these
stops may be quite audible and the operator
should release the clutch handle immediately,
de-ener gizing the elevating motor circuit or the
elevating motor circuit pr otective fuse will open
to protect the motor. The stop bolts should be
set to 3/32" to 1/8" clearance and only changed
or reset after all other elevating adjustments are
made and verified. Figure 6 and 53.
4-8 Ground
A visual check should be made to observe the
ground connection. The ground shoe on the
moveable breaker is designed to have a nominal engagement of 1-1/2" +1/4" vertically with
the steel and copper spring loaded disconnects
of the gr ound device in the switchgear.
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PowerVac® 5kV Vertical Lift
Chapter 4. Installation
4-9 Secondary Coupler
On the top left front of the breaker, there is a
plastic block which holds the male secondary
coupler pins. This block should make contact
with, and slightly raise a spring loaded plastic
block which holds female secondary coupler
sockets on the switchgear . The contact depression should be 1/8". It is not always possible
to have the plastic blocks in contact over their
entire flat surface. Often, the rear of the blocks
are engaged while a gap exists along the front
edge. This is an acceptable condition. The contacting block surfaces should touch and the female block edge move upward between1/32" to
1/8". See Figure 11.
1
4-10 Position Switch (TOC)
The position switch is an optional device
mounted in the rear left side of the switchgear
cubicle. The switch contacts operate when the
lifting mechanism is in either the fully raised or
fully lowered position. Switch operation should
be checked with the breaker withdrawn manually and the equipment de-energized, and again
electrically, with the breaker in the cubicle.
2
3
1 Secondary disconnect block shims
2 16 Secondary disconnect pins
3 Ground pin for use with a test cabinet
Figure 11. Secondary disconnect coupler
17
5-1 Description
PowerV ac® 5kV Vertical Lift
Chapter 5. Operation
The PowerV ac® 5kV VL vacuum circuit br eaker
uses a sealed vacuum power interrupter to establish and interrupt a primary circuit. Primary
connections to the associated metal-clad
switchgear are made by pole assemblies, electrically and mechanically connected to the
vacuum interr upters. The operating mechanism
provides vertical motion at each pole location
in order to move the lower contact of the
vacuum inter r upters fr om an open position to a
spring-loaded closed position and then back to
the open position on command.
The ML-19 mechanism (Figure 12) is a storedener gy type mechanism and uses a gear motor
to char ge a closing spring. During a closing operation, the ener gy stored in the closing spring
is used to close the vacuum interr upter contacts,
charge the wipe springs which load the contacts, char ge the opening springs, and overcome
bearing and other frictional forces.
The energy then stored in the wipe and opening springs will open the contacts during an
opening operation.
Closing and opening operations are contr olled
electrically by the control switch on the metalclad door or remote relaying.
Mechanical contr ol for maintenance or emergencies is provided by manual close and trip buttons on the circuit br eaker.
Also, the closing spring may be manually
char ged (Figure 7) for de-energized checks and
maintenance.
Figure 12. Fr ont View of ML-19 Mechanism with Fr ont Cover Removed
1 Opening Spring
2 Char ging Motor
3 Close Spring
4 Manual Close Button
5 Char ge/Dischar ge Indicator
6 Manual T rip Button
7 Open/Close Indicator
8 Counter
9 Manual Charge Lever
10 Positive Interlock Switch
11 Close Relay
12 Cam shaft
13 Close coil
18
14 Close coil adjustment collar
15 Close latch check switch
16 Opening dashpot
17 Auzilary switch
18 MOC Plunger linkage
19 Positive interlock bar
PowerV ac® 5kV Vertical Lift
Chapter 5. Operation
5-2 Close Spring Charging
Figure 13 shows a left side view of the closing
spring. The closing spring is char ged and ready
to close. The closing spring charging system
consists of a closing spring mounted on the
left side of the breaker and the electrical char ging system mounted on the right side of the
breaker. Both components are fastened to the
cam shaft (Figure 13, Item 2).
A manual char ging system is provided to manually char ge the br eaker, or while under maintenance so that the mechanism can be slow
closed and the closing spring can be charged.
(Figure 14, Item 1)
Figure 14. Manual Char ging system
right side view
1 Manual char ging crank
2 One way clutch
Figure 13. Charging & Trip system left side view
1 Closing spring 4 Trip r eturn spring
2 Cam shaft 5 Trip linkage
3 T rip Solenoid 6 52 Chg & SM/LS switch
WARNING: DO NOT ATTEMPT TO MANUALLY CHARGE A CHARGED BREAKER. TO
DO SO COULD DAMAGE THE CHARGING
CLUTCH AND MAKE THE MANUAL CHARGING FEATURE INOPERABLE.
The manual char ging system (Figure 14) works
directly on the cam shaft where a one-way
clutch (Figure 14, Item 2), driven by a manual
handle, pr ovides rotation of the ratchet wheel.
Manual pumping of the handle advances the
ratchet wheel and the holding pawl prevents
counter -r otation while the handle is retur ning
for another str oke. Approximately eight complete str okes of the manual handle are requir ed
for one complete spring-char ging operation.
When the spring charge indicator (Figure 1,
Item 5) shows “CHARGED”, MANUAL CHARGING MUST BE DISCONTINUED TO AVOID
MECHANISM DAMAGE.
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PowerV ac® 5kV Vertical Lift
Chapter 5. Operation
Spring char ging is accomplished electrically by
a rotating eccentric on the output shaft of a
gear motor (Figure 15, Item 6) which in turn
drives pivoted charging arms (Figure 15, Item
1). The charging arms oscillate about the
centerline of a ratchet wheel (Figure 15, Item 2).
A driving pawl (Figure 15, item 3), mounted
within the charging arms, oscillates with the
char ging arms. Star ting fr om its rear-most position, the charging arms rotate forward, while
spring forces engage the driving pawl with a
tooth on the ratchet wheel. The ratchet wheel is
advanced by the r otating char ging arms and pawl
assembly . Advancement of one tooth spacing
is provided for each oscillation of the system.
The ratchet motion is restricted to one direction by a spring-loaded holding pawl (Figure
15, Item 4) that prevents the ratchet wheel fr om
going backwards as the charging arm oscillates back to pick up the next tooth. Thirteen
complete cycles of the char ging arms ar e needed
for a full char ge of the closing spring. The efficient, compact gear motor accomplishes this
action in about two seconds. When the charging cycle is complete, the ratchet wheel is positioned so that a missing tooth is adjacent to the
driving pawl and any motor overspin will not
drive the ratchet wheel, thus preventing damage to the system.
The closing coil cannot be electrically energized
unless the closing spring is completely char ged.
This action is prevented by the 52/CHG switch
in the closing circuit. (Figure 13, Item 6)
5-3 Trip Free Operation
The linkage is mechanically trip-free in any location on the closing stroke. Electrically energizing the trip coil while closing will, after the
auxiliary switch contacts change position, rotate the trip latch and permit the cir cuit breaker
to open fully . The linkage will r eset as in a normal open operation and the closing spring will
rechar ge as described under “CLOSE SPRING
CHARGING”.
View rotated
90 degrees
1 Charging arms 5 Close latch
2 Ratchet wheel 6 Charging motor
3 Driving pawl 7 52 LCS switch
4 Holding pawl 8 T rip latch
Figure 15. Electrical Char ging system
right side view
1 Closing cam 4 Primary cross shaft
2 Closing roller 5 Primary drive crank
3 Close prop latch 6 Trip latch
Figure 16. Closing linkage left side view
5-4 Closing Operation
By either energizing the close solenoid or depressing the manual close button(Figure 1 , Item
8) the close latch (Figure 15, Item 5) is r otated,
releasing the closing spring (Figure 13, Item 1).
This action releases the energy in the closing
spring and transmits it to the closing cam (Figure 16, Item 1) and closing r oller (Figure 16, Item
2) causing the linkage to rise until the close prop
(Figure 16, Item 3) can slip under the close r oller
(Figure 16, Item 2) and hold the linkage in place.
As the linkage moves, the primary drive crank
(Figure 16, Item 5) r otates the primary cr oss shaft
(Figures 16 & 17, Item 4) which in turn rotates
the outer phase bell cranks. (Figure 17, item 2)
20
PowerVac® 5kV Vertical Lift
Chapter 5. Operation
The rotation of the primary cross shaft rotates
two outer phase bell cranks which compress
the outer opening springs (Figure 17, Item 1).
The primary cr oss shaft also rotates two sets of
inner drive cranks that in turn rotate two outer
sets of secondary drive cranks, (Figur e 18, Item
2) As the outer secondary drive cranks rotate
about the secondary cr oss shaft, the center drive
cranks are rotated. The rotation of the secondary drive cranks close the vacuum inter r upters,
and compresses the wipe springs on all three
phases . (Figure 18, Item 1) The inter r upters are
driven closed through insulated operating rods.
(Figure 18, Item 4). This inter rupters are driven
closed through insulated operating rods (Figure 18, Item 4)
The rotation of the primary cross shaft (Figure
17, Item 4) also changes the auxiliary switch
position. (Figure 17, Item 3) The position flag
on the front panel will then indicate “CLOSED”.
After the breaker is closed, the char ging motor
is again energized and the closing spring is
charged as described under “CLOSE SPRING
CHARGING”. Spring char ging is possible when
the breaker is in the closed position because
the linkage is held in place by the prop.
5-5 Opening Operation
By either ener gizing the trip solenoid (Figure 13
Item 3) or depressing the manual trip button
(Figure 1, Item 7), the trip latch (Figure 16, Item
6) is r otated, permitting the linkage to collapse.
The vacuum inter rupter contacts will then open
under the force of the wipe springs (Figure 18,
item 1) and opening springs (Figure 17, item 1).
At the end of the opening stroke, the center
phase secondary drive cranks hit the dashpot
limiting overtravel and r ebound.
Rotation of the Primary cross shaft from the
closed to the open position operates the auxiliary switch (Figur e 17, Item 3) opening the trip
coil circuit. When the closing spring has been
recharged,( Figure 13, Item 1) the linkage is reset allowing the trip latch (Figure 16, Item 6) to
rest in place on the trip r oller, ready for another
closing operation. If the closing spring has not
been recharged, the trip latch will be held out
of position. A latch-checking switch, 52 LCS
(Figure 15,Item 7) will not close unless the latch
is in its normal position. The contacts of the
latch-checking switch are par t of the closing cir cuit and will not allow for an electrical close
until the latch is reset.
1 Opening Spring 3 Auxilliar y switch
2 Outer bell cranks 4 Primar y cross shaft
Figure 17. Opening spring & auxialliary
switch left side view
1 Wipe spring 4 Insulated operating rod
2 Secondary drive crank 5 Wipe indicator
3 Secondary cross shaft
Figure 18. Wipe Spring assembly-
left side view
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