Eaton 36W-VAC25 Programming manual
I.B. 3A74499B
Effective 11/97 Supersedes.B. 3A74499A Dated May, 1993
Cutler-Hammer
Instructions for Installation, Operation and Maintenance
of Type W-VAC Vacuum Circuit Breakers
W-VAC Breaker Element
W-VAC Breaker with Carriage
Assembly for SIngle Tier Switchgear W-VAC Breaker with Cradle
Assembly for Double Tier Switchgear
I.B. 3A74499B Page iii
Effective 11/97
Cutler-Hammer
Power Distribution Components Division
Five Parkway Center
Pittsburgh, PA 15220
All possible contingencies which may arise during installation, operation or maintenance, and all details and
variations of this equipment do not purport to be covered by these instructions. If further information is
desired by purchaser regarding his particular installation, operation or maintenance of particular equipment,
contact a Cutler-Hammer representative.
IMPROPERLY INSTALLING OR MAINTAINING
THESE PRODUCTS CAN RESULT IN DEATH, SERI-
OUS PERSONAL INJURY, OR PROPERTY DAMAGE.
READ AND UNDERSTAND THESE INSTRUCTIONS
BEFORE ATTEMPTING ANY UNPACKING, ASSEM-
BLY, OPERATION OR MAINTENANCE OF THE CIR-
CUIT BREAKERS.
INSTALLATION OR MAINTENANCE SHOULD BE
ATTEMPTED ONLY BY QUALIFIED PERSONNEL.
THIS INSTRUCTION BOOK SHOULD NOT BE CON-
SIDERED ALL INCLUSIVE REGARDING INSTALLA-
TION OR MAINTENANCE PROCEDURES. IF FUR-
THER INFORMATION IS REQUIRED, YOU SHOULD
CONTACT CUTLER-HAMMER.
THE CIRCUIT BREAKER ELEMENTS DESCRIBED IN
THIS BOOK ARE DESIGNED AND TESTED TO
OPERATE WITHIN THEIR NAMEPLATE RATINGS.
OPERATION OUTSIDE OF THESE RATINGS MAY
CAUSE THE EQUIPMENT TO FAIL, RESULTING IN
DEATH, BODILY INJURY AND PROPERTY DAM-
AGE.
ALL SAFETY CODES, SAFETY STANDARDS
AND/OR REGULATIONS AS THEY MAY BE
APPLIED TO THIS TYPE OF EQUIPMENT MUST BE
STRICTLY ADHERED TO.
THESE CIRCUIT BREAKER ELEMENTS ARE
DESIGNED TO BE INSTALLED PURSUANT TO THE
AMERICAN NATIONAL STANDARDS INSTITUTE
(ANSI). SERIOUS INJURY, INCLUDING DEATH, CAN
RESULT FROM FAILURE TO FOLLOW THE PROCE-
DURES OUTLINED IN THIS MANUAL. THESE CIR-
CUIT BREAKER ELEMENTS ARE SOLD PURSUANT
TO A NON-STANDARD PURCHASING AGREEMENT
WHICH LIMITS THE LIABILITY OF THE MANUFAC-
TURER.
!
WARNING
!
WARNING
I.B. 3A74499B
Page iv
Effective 11/97
TABLE OF CONTENTS
PAGE
SECTION 1 INTRODUCTION
1-1 Type W-VAC Breaker Ratings.............................................................................................................................1
SECTION 2 SAFE PRACTICES................................................................................................................................4
SECTION 3 RECEIVING, HANDLING AND STORAGE
3-1 Receiving.............................................................................................................................................................5
3-2 Handling..............................................................................................................................................................6
3-3 Storage ...............................................................................................................................................................6
SECTION 4 INSTALLATION
4-1 Initial Inspection and Operation.........................................................................................................................12
4-2 Manual Operation Check...................................................................................................................................12
4-3 Vacuum Interrupter Integrity..............................................................................................................................12
4-4 Insulation...........................................................................................................................................................12
4-5 Contact Erosion and Wipe.................................................................................................................................12
4-6 Primary Circuit Resistance................................................................................................................................12
4-7 Nameplate.........................................................................................................................................................12
4-8 Electrical Operations Check..............................................................................................................................12
4-9 Breaker/Compartment Interface Check.............................................................................................................13
SECTION 5 DESCRIPTION AND OPERATION
5-1 Interrupter Assembly.........................................................................................................................................16
5-1.1 Vacuum Interrupter............................................................................................................................................16
5-1.2 Contact Erosion Indicator..................................................................................................................................17
5-1.3 “T” Cutout Loading Spring Indicator ..................................................................................................................17
5-1.4 Contact Wipe and Stroke ..................................................................................................................................17
5-1.5 Pole Unit Support Molding.................................................................................................................................18
5-2 Stored Energy Mechanism................................................................................................................................18
5-2.1 Operation of Stored Energy Mechanism ...........................................................................................................18
5-2.2 Charging............................................................................................................................................................19
5-2.3 Closing Operation..............................................................................................................................................19
5-2.4 Tripping Operation.............................................................................................................................................19
5-2.5 Trip Free Operation...........................................................................................................................................19
5-3 Control Scheme.................................................................................................................................................19
5-3.1 Timing .............................................................................................................................................................22
5-3.2 Secondary Disconnects.....................................................................................................................................22
5-3.3 Undervoltage Trip Device..................................................................................................................................22
5-4 Interlocks...........................................................................................................................................................23
5-4.1 Floor Tripping, Spring Release and Anti-Latch Interlocks.................................................................................23
5-4.2 Levering Interlock..............................................................................................................................................23
5-4.3 Anti-Close Interlock ...........................................................................................................................................23
5-4.4 Earthing Drive Interlock.....................................................................................................................................23
I.B. 3A74499B Page v
Effective 11/97
5-5 Miscellaneous....................................................................................................................................................23
5-5.1 Earthing Contact................................................................................................................................................23
5-5.2 Operations Counter...........................................................................................................................................23
5-6 Levering Mechanism.........................................................................................................................................23
SECTION 6 INSPECTION AND MAINTENANCE
6-1 Warning.............................................................................................................................................................25
6-2 Frequency .........................................................................................................................................................25
6-3 Inspection and Maintenance Procedures..........................................................................................................26
6-4 Vacuum Interrupter Integrity Test..................................................................................................................... 27
6-5 Contact Erosion and Wipe.................................................................................................................................27
6-6 Insulation...........................................................................................................................................................28
6-7 Insulation Integrity Check..................................................................................................................................28
6-8 Primary Circuit Resistance Check.....................................................................................................................29
6-9 Mechanism Check.............................................................................................................................................29
6-10 Lubrication.........................................................................................................................................................29
6-11 Troubleshooting Chart.......................................................................................................................................31
SECTION 7 RENEWAL PARTS
7-1 General .............................................................................................................................................................34
7-2 Ordering Instructions.........................................................................................................................................34
I.B. 3A74499B
Page vi
Effective 11/97
FIGURES
Figure Title Page
1-1 Type W-VAC Breaker Element Only Outline Dimensions (millimeters) and Weights (Kilograms) ............2
1-2 Outline and Dimensions (mm) Type W-VAC Breaker Element with Carriage
Assembly and Cradle Assembly..................................................................................................................3
3-1 Typical VCP-W Tools and Accessories.....................................................................................................5
3-2 Typical Front View VCP-W Vacuum Circuit Breaker Element...................................................................7
3-3 Typical VCP-W Vacuum Circuit Breaker Element with Front Cover Removed .........................................8
3-4 Typical Rear View VCP-W Vacuum Circuit Breaker Element....................................................................9
3-5 Typical VCP-W Vacuum Circuit Breaker Element Escutcheon ...............................................................10
3-6 Front and Rear External View W-VAC Breaker With Cradle Assembly for
Double Tier Switvhgear ...........................................................................................................................11
4-1 Type W-VAC Breaker Manual Operation (Single Tier Breaker Shown) ..................................................13
5-1 Flush Mounted Configuration...................................................................................................................16
5-2 Behind the Door Configuration ................................................................................................................17
5-3 Closeup of Type W-VAC Breaker Vacuum Interrupters and Current Carrying System...........................17
5-4 Type W-VAC 95 kV BIL Breaker Shown With Left Hand Cover Removed for Clarity Purposes.............18
5-5 Closing Cam and Trip Linkage ................................................................................................................20
5-6 Charging Schematic ................................................................................................................................21
5-7 Undervoltage Trip Device Configuration..................................................................................................24
6-1 Lubrication Points....................................................................................................................................25
6-2 Vacuum Interrupter Showing Contact Erosion Indicator With Breaker Open..........................................28
6-3 Vacuum Interrupter Showing Contact Erosion Indicator With Breaker Closed........................................28
6-4 “T” Contact Wipe Indicator.......................................................................................................................29
6-5 Wipe Indication........................................................................................................................................29
TABLES
Table Title Page
1.1 Table 1.1 Type W-VAC Vacuum Circuit Breaker Ratings.........................................................................1
5.1 Typical Opening and Closing Times Value..............................................................................................22
6.1 Test Voltage.............................................................................................................................................27
6.2 Typical Resistance Measurements..........................................................................................................30
7.1 Recommended W-VAC Spare Parts .......................................................................................................35
I.B. 3A74499B Page 1
Effective 11/97
SECTION 1: INTRODUCTION
The purpose of this book is to provide instructions for
unpacking, storage, installation, operation and mainte-
nance of Type W-VAC Vacuum Circuit Breakers. Type
W-VAC is a horizontal drawout type removable inter-
rupting element design. It was designed specifically to
IEC 56 Standards for reliable performance, ease of
handing, and simplified maintenance. Type W-VAC can
be applied in both single tier or double tier switchgear
applications, with the basic breaker element applicable
to retrofitting. Reliable control and protection for medium
voltage equipment and circuits are achieved though the
use of Type W-VAC Vacuum Circuit Breakers.
1-1 TYPE W-VAC BREAKER RATINGS
Refer to Table 1.1
SATISFACTORY PERFORMANCE OF THESE
BREAKERS IS CONTINGENT UP-ON PROPER
APPLICATION, CORRECT INSTALLATION AND
ADEQUATE MAINTENANCE. THIS INSTRUCTION
BOOK MUST BE CAREFULLY READ AND FOL-
LOWED IN ORDER TO OBTAIN OPTIMUM PERFOR-
MANCE FOR LONG USEFUL LIFE OF THE CIRCUIT
BREAKERS.
TYPE W-VAC BREAKERS ARE PROTECTIVE
DEVICES, AS SUCH, THEY ARE MAXIMUM RATED
DEVICES. THEREFORE, THEY SHOULD NOT
UNDER ANY CIRCUMSTANCES BE APPLIED OUT-
SIDE THEIR NAMEPLATE RATINGS.
!
WARNING
Table 1.1 Type W-VAC Vacuum Circuit Breaker Ratings
Circuit Rated Frequency Rated Short Circuit Rated Insulation Level Rated Rated Nominal Current
Breaker Voltage Breaking Current Lighting Power Short
Type at & Short Circuit Pulse Frequency Circuit
50-60HZ Duration Withstand Withstand Making
Voltage Voltage Current
kV Hz kA Sec kV kV kA (Peak) Amperes
36W-VAC25 3.6 50/60 25 3 40 10 63 630, 1250, 2000
72W-VAC16 7.2 50/60 16 3 60 20 40 630, 800, 1250
72W-VAC20 7.2 50/60 20 3 60 20 50 630, 800, 1250, 1600
72W-VAC25 7.2 50/60 25 3 60 20 63 630, 800, 1250, 1600, 2000
72W-VAC32 7.2 50/60 31.5 3 60 20 79 1250, 2000
120W-VAC16 12 50/60 16 3 75 28 40 630, 800, 1250
120W-VAC20 12 50/60 20 3 75 28 50 630, 800, 1250, 1600
120W-VAC25 12 50/60 25 3 75 28 63 630, 800, 1250, 1600, 2000
120W-VAC32 12 50/60 31.5 3 75 28 79 1250, 2000
120W-VAC40 12 50/60 40 3 75 28 100 1250, 2000
150W-VAC16 15 60 16 3 95 36 40 630, 800, 1250
150W-VAC20 15 60 20 3 95 36 50 630, 800, 1250, 1600
150W-VAC25 15 60 25 3 95 36 63 630, 800, 1250, 1600, 2000
150W-VAC32 15 60 31.5 3 95 36 79 1250, 2000
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(Front View)
*150 mm for Retrofitting
(Front View)
(Side View)
(Side View)
Breaker Element: Up to 1250A
630A Element: 115kg, 800A/1250A Element: 121kg
Breaker Element: 1600A and 2000A
1600/2000A Element: 160kg
Figure 1-1 Type W-VAC breaker element only outline dimensions (millimeters) and weights (kilograms).
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OPTIONAL COVER
FOR 95 kV BIL
202
I.B. 3A74499B Page 3
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Figure 1-2 Outline and Dimensions (mm) Type W-VAC breaker element with carriage assembly and cradle assembly
Rating A B C D E F G Weight Carriage
Up to 15 kV/Up to 1250A to 40kA 570 300 1226 1202 1340 165 470 29
Up to 15 kV/1600A and2000A/Up to 40 kA 719 350 1299 1275 1340 200 620 33
Rating A B C D E F G Weight Carriage
Up to 15 kV/Up to 1250A to 40kA 490 300 786 762 738 165 470 23
Up to 15 kV/1600A and2000A/Up to 40 kA 640 350 856 835 736 200 6200 25
33.3 570
350
325 373
202
197
480 795.7 B
C
1160
520
Earthing Contacts
33.3
720
Earthing Contacts
570 373
202
197
440 701
80
355.7
EC
B
AG
F F
44.6
269
48.3
84.4 228.3
538
456.6
D
AG
F F
D
E
19.34 9.5
“A” POLE
“B” POLE
“C” POLE
“A” POLE “B” POLE
“C” POLE
I.B. 3A74499B
Page 4
Effective 11/97
SECTION 2: SAFE PRACTICES
Type W-VAC breakers are equipped with high speed,
high energy operating mechanisms. They are designed
with several built-in interlocks and safety features to pro-
vide safe and proper operating sequences.
TO PROTECT THE PERSONNEL ASSOCIATED WITH
INSTALLATION, OPERATION, AND MAINTENANCE
OF THESE BREAKERS, THE FOLLOWING PRAC-
TICES MUST BE FOLLOWED:
• Only qualified persons, as defined in the local electri-
cal code who are familiar with the installation and main-
tenance of medium voltage circuits and equipment,
should be permitted to work on these breakers.
• Read these instructions carefully before attempting
any installation, operation or maintenance of these
breakers.
• Always remove the breakers from the enclosure
before performing any maintenance. Failure to do so
could result in electrical shock leading to death, severe
personal injury or property damage.
• Do not work on a breaker with the secondary test cou-
pler engaged. Failure to disconnect the test coupler
could result in an electrical shock leading to death, per-
sonal injury or property damage.
• Do not work on a closed breaker or a breaker with
closing springs charged. The closing spring should be
discharged and the main contacts open before working
on the breaker. Failure to do so could result in cutting or
crushing injuries.
• Do not use a circuit breaker by itself as the sole
means of isolating a high voltage circuit, Remove the
breaker to the Disconnect position and follow good lock-
out and tagging rules, as well as all applicable codes,
regulations and work rules.
• Do not leave the breaker in an intermediate position in
the cell. Always have the breaker either in the Test or
Connected position. Failure to do so could result in a
flash over and possible death, personal injury or proper-
ty damage.
• Always remove the maintenance tool from the breaker
after charging the closing springs.
• Breakers are equipped with safety interlocks. Do not
defeat them. This may result in death, bodily injury or
equipment damage.
!
WARNING
I.B. 3A74499B Page 5
Effective 11/97
SECTION 3: RECEIVING, HANDLING AND
STORAGE
Type W-VAC circuit breakers are subjected to complete
factory production tests and inspection before being
packed. They are shipped in packages designed to pro-
vide maximum protection to the equipment during ship-
ment and storage, and, at the same time, to provide
convenient handing. Accessories, such as the mainte-
nance tool and levering crank are shipped separately.
3-1 RECEIVING
Until the breaker is ready to be delivered to the
switchgear site for installation, DO NOT remove it from
its container. If the breaker is to be placed in storage,
maximum protection can be obtained by keeping it in its
container.
Upon receipt of the equipment, inspect the container for
any signs of damage or rough handing. Open the con-
tainer carefully to avoid any damage to the contents.
When opening the container, be careful that any loose
items or hardware are not discarded with the packing
material. Check the contents of each package against
the packing list.
Examine the breaker for any signs of shipping damage
such as broken, missing or loose hardware, damaged or
deformed insulation and other components. File claims
immediately with the carrier if damage or loss is detect-
ed and notify the nearest Westinghouse Sales Office.
Tools and Accessories
Maintenance Tool: Used to charge the closing springs.
(Style 8064A02G01)
Lifting Yoke: Optional item used to lift the breaker.
(Style 8794C67G01 for up to 1250A breakers)
(Style 8794C68G01 for 1600A, 2000A breakers)
Primary Disconnect Plier: Used to install and remove
breaker primary disconnects.
(Style 591C901G02)
Figure 3-1 Typical W-VAC tools with lifting yoke shown in use
I.B. 3A74499B
Page 6
Effective 11/97
3-2 HANDING
DO NOT USE ANY LIFTING DEVICE AS A PLAT-
FORM FOR PERFORMING MAINTENANCE, REPAIR
OR ADJUSTMENT OF THE BREAKER OR FOR
OPENING, CLOSING THE CONTACTS OR CHARG-
ING THE SPRINGS. THE BREAKER MAY SLIP OR
FALL CAUSING SEVERE PERSONAL INJURY.
ALWAYS PERFORM MAINTENANCE, REPAIR AND
ADJUSTMENTS ON A WORKBENCH CAPABLE OF
SUPPORTING THE BREAKER.
Type W-VAC breaker shipping containers are designed
to be handled either by use of a rope sling and over-
head lifting device or by a fork truck. If containers must
be skidded for any distance, it is preferable to use roller
conveyors or individual pipe rollers.
Once a breaker has been inspected for shipping dam-
age, it is best to return it to its original shipping container
until it is ready to be installed in the Metal-Clad
Switchgear.
When a breaker is ready for installation, a lifting yoke in
conjunction with an overhead lifter or portable floor lifter
can be used to move a breaker. In some instances, this
is preferable to rolling the breaker on the floor using self
contained wheels on the cradle or carriage. If the break-
er is to be lifted, position the lifting yoke over the break-
er and insert lifters into the breaker side openings with
the lifting hole toward the interrupters. Once the lifting
yoke is securely seated in the lifting holes, the breaker
can be carefully lifted and moved.
3-3 STORAGE
If the circuit breaker is to be placed in storage, maxi-
mum protection can be obtained by keeping it in the
original container.
Before placing it in storage, checks should be made to
make sure that the breaker is free from shipping dam-
age and is in satisfactory operating condition.
The breaker is shipped with its contacts open and clos-
ing springs discharged. The indicator on the front panel
should confirm this. Insert the maintenance tool in the
manual charge socket opening (Figures 3-2 and 4-1a).
Charge the closing springs by pumping the handle up
and down about 38 times until a crisp metallic "click" is
heard. This indicates that the closing springs are
charged and is shown by the closing spring "charged"
(yellow) indicator. Remove the maintenance tool. Push
the "manual close"button. The breaker will close as
shown by the breaker contacts "closed" indicator. Push
the "manual trip" button. The breaker will trip as shown
by the breaker contacts "open" indicator. After complet-
ing this initial check, leave the closing springs "dis-
charged" and breaker contacts "open"
(Figures 3-2, 4-1c and d).
Outdoor storage is NOT recommended. If unavoidable,
the outdoor location must be well drained and a tempo-
rary shelter from sun, rain, snow, corrosive fumes, dust,
dirt falling objects and excessive moisture must be pro-
vided. Containers should be arranged to permit free cir-
culation of air on all sides and temporary heaters should
be used to minimize condensation. Moisture can cause
rusting of metal parts and deterioration of high voltage
insulation. A heat level of approximately 400 watts for
each 3 cubic meters of volume is recommended with the
heaters distributed uniformly throughout the structure
near the floor.
Indoor storage should be in a building with sufficient
heat and circulation to prevent condensation. If the
building is not heated, the same general rule for heat as
for outdoor storage should be applied.
!
WARNING
I.B. 3A74499B Page 7
Effective 11/97
Figure 3-2 Type W-VAC breaker element faceplate
123
87
4
5
6
➀Front Panel
➁Manual Charge Socket
➂Open-Closed Indicator
➃Spring Charged/Discharged Indicator
➄Operation Counter
➅Rating Nameplate
➆Manual Open Button
➇Manual Close Button
I.B. 3A74499B
Page 8
Effective 11/97
Figure 3-3 Front external view of W-VAC breaker element
15
13
12
14
11
10
16
9
67
8
1
2
3
4
5
➀L.H. Closing Spring
➁Anti-pump Relay
➂Auxiliary Switch
➃Motor Cutoff Switch
➄Closing Cam
➅Spring Release (Close Coil) Assembly
➆Shunt Trip Assembly
➇Position Switch
➈Charging Motor
➉Charging Pawl
Ratchet Wheel
R.H. Closing Spring
Opening Spring
Manual Charge Socket
Secondary Disconnect
Operation Counter
11
12
13
14
15
16
I.B. 3A74499B Page 9
Effective 11/97
Figure 3-4 Rear external view of W-VAC breaker element
1
➀Secondary Disconnect
➁Lifter Yoke Opening
➂Support Insulator
➃Primary Disconnect
➄Vacuum Interrupter
➅Contact Loading Spring “Wipe Spring”
➆Operating Rod
➇Drive Insulator
➈Flexible Connector
4
5
9
3
2
8
6
7
I.B. 3A74499B
Page 10
Effective 11/97
Figure 3-5 Side and rear external view W-VAC breaker with carriage assembly for single tier switchgear
Side View
Rear View
➀Mechanism Enclosure
➁Support Insulator
➂Primary Disconnect
➃Levering in Screw
➄Carriage
➅Carriage Wheel
➆Shoot Bolt Lever
➇Shutter Operator
➈Levering Device Socket
2
79
7
3
4
5
8
6
5
4
1
I.B. 3A74499B Page 11
Effective 11/97
Figure 3-6 Front and rear external view W-VAC breaker with cradle assembly for double tier switchgear
Front View
Rear View
➀Mechanism Enclosure
➁Support Insulator
➂Primary Disconnect
➃Levering in Screw
➄Cradle
➅Cradle Wheel
➆Shutter Operator
➇Levering Device Socket
➈Shoot Bolt Lever
➉Earthing Contact
3
1
2
7
5
9
8
1
7
10
64
5
I.B. 3A74499B
Page 12
Effective 11/97
SECTION 4: INSTALLATION
BEFORE PLACING THE BREAKER IN SERVICE,
CAREFULLY FOLLOW THE INSTALLATION PROCE-
DURE GIVEN BELOW. NOT FOLLOWING THE PRO-
CEDURE CAN FAIL TO UNCOVER SHIPPING DAM-
AGE THAT MAY RESULT IN INCORRECT BREAKER
OPERATION LEADING TO DEATH, BODILY INJURY,
AND PROPERTY DAMAGE.
4-1 INITIAL INSPECTION AND OPERATION
Before attempting to put the breaker in service, it should
be carefully examined and operated manually and elec-
trically. Examine a breaker for loose or obviously dam-
aged parts.
4-2 MANUAL OPERATION CHECK
Place the maintenance tool into the manual charge
socket opening and charge the closing springs with
about 3 up and down strokes of the handle. When
charging is complete, the closing crank goes over center
with an audible "click" and the springs Charged /
Discharged indicator shows "Charged".
If the springs are to be charged on a closed breaker,
no click is heard at the end of charging operation.
Discontinue charging and remove the maintenance
tool as soon as "Charged" flag is fully visible.
Continued attempts to further charge may result in
damage to the mechanism. Remove the mainte-
nance tool. Close and trip the breaker several
times (Figure 4.1).
4-3 VACUUM INTERRUPTER INTEGRITY
Using a dry lint free cloth or paper towel, clean all the
insulating surfaces of the pole units. Conduct a vacuum
interrupter integrity check as described in Section 6.4.
4-4 INSULATION
Check breaker primary and secondary insulation per
Section 6.7.
4-5 CONTACT EROSION AND WIPE
Manually charge the closing springs and close the
breaker. Check contact erosion and wipe as described
in Section 6.5.
4-6 PRIMARY CIRCUIT RESISTANCE
Check the primary circuit resistance as described in
Section 6.8 The resistance should not exceed the val-
ues specified. Record the values obtained for future ref-
erence.
4-7 NAMEPLATE
Compare the breaker nameplate information with
switchgear drawings for compatibility.
4-8 ELECTRICAL OPERATIONS CHECK
After going through the above steps, the breaker is now
ready to be operated electrically. It is preferred that this
check be made with the breaker in a test position or by
using a test cable.
EXAMINE THE INSIDE OF THE CELL BEFORE
INSERTING THE BREAKER FOR EXCESSIVE DIRT
OR ANYTHING THAT MIGHT INTERFERE WITH THE
BREAKER TRAVEL.
EXTREME CAUTION MUST BE EXERCISED TO
INSURE THAT PRIMARY CIRCUITS ARE NOT ENER-
GIZED WHILE CHECKS ARE PREFORMED IN THE
BREAKER COMPARTMENT. FAILURE TO DO SO
MAY RESULT IN PERSONAL INJURY OR DEATH.
When testing the breaker electrically, a TEST position
is accomplished using several methods. The method
used depends on the switchgear structure approach
being utilized.
a1) If the breaker is being used in the behind the door
configuration, the structure mounted secondary contact
blocks can be manually engaged with the breaker's sec-
ondary contacts. This is accomplished with the breaker
still inside the structure and the primary contacts dis-
connected.
a2) If the breaker is being used in a flushmounted con-
figuration, the breaker must be moved to the discon-
nected position for testing. It is recommended that a test
cable be used to connect the female and male sec-
!
CAUTION
!
WARNING
!
WARNING
NOTICE
I.B. 3A74499B Page 13
Effective 11/97
Figure 4-1 Type W-VAC breaker manual operation (single tier breaker shown)
a. Inserting the maintenance tool into
the manual charging socket b. Lifting shoot lever permits insertion
of levering crank
c. Manually closing the breaker d. Manually tripping the breaker
I.B. 3A74499B
Page 14
Effective 11/97
ondary contacts when in the disconnected position. The
structure mounted secondary contact blocks are perma-
nently mounted and cannot be moved out for direct con-
nection with the breaker mounted secondary contacts.
b) For the behind the door configuration, carefully load
the breaker into the structure until it reaches the Test
position. For the flush mounted configuration, carefully
move the breaker toward the structure until it reaches
the Test position.
c) If a lifting yoke was used to move and/or load the
breaker, remove the yoke at this time.
d) For the behind the door configuration, manually
engage the secondary contact blocks by pulling the
movable blocks forward as far as possible. For the flush
mounted configuration, connect the test cable to both
the breaker and structure secondary contact blocks. As
soon as control power is available, the motor will
charge the closing springs.
e) Close and trip the breaker several times to verify the
closing and tripping operations
f) Conclude by closing the breaker.
4-9 BREAKER / COMPARTMENT INTERFACE CHECK
The assembly is provided with the following interlocks to
insure safe and correct operation:
a) Floor Tripping and Spring Release Interlock:
This optional interlock closes and trips the breaker if the
closing springs are charged as the breaker is moved
from the Test position to the Withdrawn position and
vice versa.
b) Levering Interlocks:
1. Carriage Assembly Version: This version is used for
single tier switchgear configurations. The levering
crank can only be engaged when the breaker is
open and the shoot bolt lever is lifted (Figure 4-1b)
The breaker will not close manually or electrically
while the levering crank is engaged.
2. Cradle Assembly Version: This version is used for
double tier switchgear configurations. The levering
crank can only be engaged when the breaker is
open and the horizontal shoot bolts are engaged
(fully extended). The breaker will not close manually
or electrically while the levering crank is engaged.
c) Anti-Close Interlock: This interlock prevents releasing
the closing springs electrically or manually if the breaker
is already closed.
d) Anti-Latch Interlock: This interlock prevents the
breaker from being closed between the Connected and
Test positions.
e) Shutter Drive Interlock:
The metallic switchgear shutters are independently
operated permitting them to be locked in the open posi-
tion for servicing the primary disconnects. The locking
system is disabled when the breaker is being connected
permitting the shutters to operate in the normal manner.
f) Earthing Drive Interlock:
If the switchgear is equipped with an earthing switch,
the breaker can only be inserted into the switchgear if
the earthing switch is open.
Check for the correct operation of the interlocks just
described by starting with the breaker in the Test posi-
tion and completing the following steps:
Step 1: Engagement of Levering Crank:
1. For the single tier configuration carriage assembly
version, the shoot bolt should be fitted into the first
slot of the interlock plate located on the floor of the
switchgear. Charge the closing springs and close
the breaker. The slider cannot be pushed far
enough to engage the levering crank.
2. For the double tier configuration cradle assembly
version, the horizontal shoot bolts should be fitted
into the slots of interlock plates located at the sides
of the switchgear. Charge the closing springs and
close the breaker. The slider cannot be pushed far
enough to engage the levering crank.
Step 2 :
Open the breaker, engage the levering crank and lever
the breaker into the Connected position. Remove the
levering crank.
Step 3:
Close the breaker. The motor starts charging the closing
springs if control power is available.
Step 4:
Open the breaker, engage the levering crank and
attempt to close the breaker manually or electrically.
The breaker will go trip free (spring discharge but break-
er does not close).
Step 5:
Lever the breaker out approximately half way towards
the Test position. Remove the levering crank and
attempt to close the breaker by pushing the manual
close button. The breaker will go trip free. Lever the
breaker all the way into the Test position. The sec-
ondary disconnects will disengage automatically.
This manual suits for next models
13
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