Cutler-Hammer W-VAC Programming manual

Effective 12/98
I.B. 8801C71H01
Instructions for Installation, Operation and Maintenance of 24kV
Type W-VAC Vacuum Circuit Breaker

CUTLER-HAMMER 24kV Type W-VAC Circuit Breaker
Effective 12/98
I.B. 8801C71H01
IMPROPERLY INSTALLING OR MAINTAINING
THESE PRODUCTS CAN RESULT IN DEATH,
SERIOUS PERSONAL INJURY, OR PROPERTY
DAMAGE.
READ AND UNDERSTAND THESE
INSTRUCTIONS BEFORE ATTEMPTING ANY
UNPACKING, ASSEMBLY, OPERATION OR
MAINTENANCE OF THE CIRCUIT BREAKERS.
INSTALLATION OR MAINTENANCE SHOULD BE
ATTEMPTED ONLY BY QUALIFIED PERSONNEL.
THIS INSTRUCTION BOOK SHALL NOT BE
CONSIDERED ALL INCLUSIVE REGARDING
INSTALLATION OR MAINTENANCE
PROCEDURES. IF FURTHER INFORMATION IS
REQUIRED, YOU SHOULD CONTACT CUTLER-
HAMMER.
WARNING
THE CIRCUIT BREAKERS 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 DAMAGE.
ALL SAFETY CODES, SAFETY STANDARDS
AND/OR REGUALTIONS AS THEY MAY BE
APPLIED TO THIS TYPE OF EQUIPMENT
MUST BE STRICTLY ADHERED TO.
Cutler-Hammer
Power Distribution Components Division
Pittsburgh, Pennsylvania, USA
First Printing:
December 1998
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 installation, operation or maintenance of
particular equipment, contact a Cutler-Hammer representative.
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!WARNING

CUTLER-HAMMER 24kV Type W-VAC Circuit Breaker
Effective 12/98
I.B. 8801C71H01
TABLE OF CONTENTS
SECTION 1: INTRODUCTION PAGE
1-1 Preliminary Comments and Safety Precautions 1
1-1.1 Warranty and Liability Information 1
1-1.2 Safety Precautions 1
1-2 General Information 1
1-3 Type W-VAC Vacuum Circuit Breaker Ratings (Table 1.1) 2
1-4 Outlines and Dimensions 3
SECTION 2: SAFE PRACTICES
2-1 Recommendations 4
SECTION 3: RECEIVING, HANDLING, AND STORAGE
3-1 General 5
3-2 Receiving 5
3-3 Handling 5
3-4 Storage 6
3-5 Tools and Accessories 7
3-6 Type W-VAC Vacuum Circuit Breaker Weights (Table 3.1) 7
SECTION 4: INITIAL INSPECTION AND INSTALLATION
4-1 Introduction 13
4-2 Manual Operation Check 13
4-3 Vacuum Interrupter Integrity 13
4-4 Insulation 13
4-5 Contact Erosion and Wipe 13
4-6 Primary Circuit Resistance 13
4-7 Nameplate 13
4-8 Electrical Operation Check 14
4-8.1 Circuit Breaker Insertion and Removal 14
4-8.2 Operation Check Performance 19
4-9 Breaker / Structure Interfacing 19
4-9.1 Interface Interlocks 19
4-9.2 Interfacing Check 20
SECTION 5: DESCRIPTION AND OPERATION
5-1 Introduction 21
5-2 Interrupter Assembly 21
5-2.1 Vacuum Interrupter 21
5-2.2 Contact Erosion Indicator 22
5-2.3 Loading Spring Indicator 22
5-2.4 Contact Wipe Stroke 22
5-2.5 Primary Disconnects 22
5-3 Stored Energy Mechanism 23
5-3.1 Operation of Stored Energy Mechanism 23
5-3.2 Charging 23
5-3.3 Closing Operation 25
5-3.4 Tripping Operation 25

CUTLER-HAMMER 24kV Type W-VAC Circuit Breaker
Effective 12/98
I.B. 8801C71H01
PAGE
5-4 Control Schemes 25
5-4.1 Timing 25
5-4.2 Secondary Disconnects 26
5-4.3 Undervoltage Trip Device 26
5-5 Interlocks and Interfacing 27
5-6 Levering Mechanism 27
5-7 Operations Counter 27
5-8 Ground Contact 27
5-9 TOC Switch Operations 27
SECTION 6: INSPECTION, MAINTENANCE AND TROUBLESHOOTING
6-1 Introduction 31
6-2 Frequency of Inspection and Maintenance 31
6-2.1 Qualified Personnel 31
6-2.2 Helpful Tools and Accessory Items 32
6-2.3 General Torque Guidelines 32
6-3 Inspection and Maintenance Procedures 34
6-4 Vacuum Interrupter Integrity Test 35
6-5 Contact Erosion 36
6-6 Contact Wipe 36
6-7 Insulation 36
6-8 Insulation Integrity Check 36
6-9 Primary Circuit Resistance Check 37
6-10 Mechanism Check 37
6-11 Lubrication 38
6-12 Troubleshooting Chart 39
SECTION 7: RENEWAL PARTS
7-1 General 42
7-1.1 Ordering Instructions 42

CUTLER-HAMMER 24kV Type W-VAC Circuit Breaker
Effective 12/98
I.B. 8801C71H01
FIGURE
FIGURE: TITLE PAGE
1-1 Type W-VAC 24kV Circuit Breaker Outlines and Dimensions 3
3-1 Typical W-VAC Tools and Accessories 8
3-2 Front View W-VAC 24kV Vacuum Circuit Breaker 9
3-3 W-VAC 24kV Vacuum Circuit Breaker with Front Cover Removed 10
3-4 Rear View W-VAC 24kV Vacuum Circuit Breaker 11
3-7 Typical W-VAC 24kV Escutcheon 12
4-1 Type W-VAC Circuit Breaker Manual Charging Handle in Use 13
4-2 Typical W-VAC Circuit Breaker Compartment 16
4-3 Engaging Extension Rail in a W-VAC Circuit Breaker Compartment 17
4-4 Typical W-VAC 24kV Circuit Breaker Bottom View 18
4-5 Pulling Secondary Disconnect Cage to Engage Secondaries in TEST Position 19
4-6 Engaging Levering-In Crank 19
5-1 Rear View Showing Pole Unit Enclosure 21
5-2 Graphic Representation of Arc Interruption 22
5-3 Closing CAM and Trip Linkage 24
5-4 Charging Schematic 28
5-5 Typical 24kV W-VAC “DC” and “AC” Control Schematics 29
5-6 Secondary Circuit Breaker Plug Shown Mounted Lower Left 26
5-7 Undervoltage Trip Device Configuration 30
6-1 Lubrication Points 33
6-2 Contact Erosion Check Being Made (Circuit Breaker Closed) 36
6-3 Graphical Representation for Contact Erosion Check (Circuit Breaker Closed) 36
6-4 Side View of Loading Spring Indicator (Circuit Breaker Closed) 37
6-5 Graphical Representation of Contact Wipe Measurement of Loading Spring
Indicator (Circuit Breaker Closed) 37
TABLES
TABLE: TITLE PAGE
1.1 Type W-VAC Vacuum Circuit Breaker Ratings 2
3.1 W-VAC Circuit Breaker Weights 7
5.1 Circuit Breaker Timing 26
6.1 Torque Guidelines 32
6.2 Test Voltage 36
6.3 Typical Resistance Measurements 38
7.1 Recommended Renewal Parts for ANSI Rated Breakers 42

CUTLER-HAMMER 24kV Type W-VAC Circuit Breaker
Effective 12/98 Page 1of 47
I.B. 8801C71H01
SECTION 1: INTRODUCTION
1-1 PRELIMINARY COMMENTS AND SAFETY
PRECAUTIONS
This technical document is intended to cover most
aspects associated with the installation, application,
operation and maintenance of the W-VAC Vacuum
Circuit Breakers. It is provided as a guide for
authorized and qualified personnel only. Please refer
to the specific WARNING and CAUTION in Section 1-
1.2 before proceeding. If further information is
required by the purchaser regarding a particular
installation, application or maintenance activity, a
Cutler-Hammer representative should be contacted.
1-1.1 WARRANTY AND LIABILITY INFORMATION
NO WARRANTIES, EXPRESSED OR IMPLIED,
INCLUDING WARRANTIES OF FITNESS FOR A
PARTICULAR PURPOSE OF MERCHANTABILITY,
OR WARRANTIES ARISING FROM COURSE OF
DEALING OR USAGE OF TRADE, ARE MADE
REGARDING THE INFORMATION,
RECOMMENDATIONS AND DESCRIPTIONS
CONTAINED HEREIN. In no event will Cutler-
Hammer be responsible to the purchaser or user in
contract, in tort (including negligence), strict liability or
otherwise for any special, indirect, incidental or
consequential damage or loss of use of equipment,
plant or power system, cost of capital, loss of power,
additional expenses in the use of existing power
facilities, or claims against the purchaser or user by
its customers resulting from the use of information
and descriptions contained herein.
1-1.2 SAFETY PRECAUTIONS
All safety codes, safety standards and/or regulations
must be strictly observed in the installation, operation
and maintenance of this device.
WARNING
THE WARNINGS AND CAUTIONS INCLUDED AS
PART OF THE PROCEDURAL STEPS IN THIS
DOCUMENT ARE FOR PERSONEL SAFETY AND
PROTECTION OF EQUIPMENT FROM DAMAGE.
AN EXAMPLE OF A TYPICAL WARNING LABEL
HEADING IS SHOWN ABOVE IN REVERSE TYPE
TO FAMILIARIZE PERSONNEL WITH THE STYLE
OF PRESENTATION. THIS WILL HELP TO
ENSURE THAT PERSONNEL ARE ALERT TO
WARNINGS, WHICH MAY APPEAR THROUGHOUT
THE DOCUMENT. IN ADDITION, CAUTIONS ARE
ALL UPPERCASE AND BOLDFACE AS SHOWN
BELOW.
CAUTION
COMPLETELY READ AND UNDERSTAND THE
MATERIAL PRESENTED IN THIS DOCUMENT
BEFORE ATTEMPTING INSTALLATION,
OPERATION OR APPLICATION OF THE
EQUIPMENT. IN ADDITION, ONLY QUALIFIED
PERSONS SHOULD BE PERMITTED TO
PERFORM ANY WORK ASSOCIATED WITH THE
EQUIPMENT. ANY WIRING INSTRUCTIONS
PRESENTED IN THIS DOCUMENT MUST BE
FOLLOWED PRECISELY. FAILURE TO DO SO
COULD CAUSE PERMANENT EQUIPMENT
DAMAGE.
1-2 GENERAL INFORMATION
The purpose of this book is to provide instructions for
unpacking, storage, use, operation and maintenance
of 24kVType W-VAC Vacuum Circuit Breakers. They
are horizontal draw-out, mid-mount removable
interrupting elements ideal for use in new metal-clad
switchgear, as well as for modernization and life
extension of existing switchgear. Designed to IEC
Standards for reliable performance, ease of handling,
and simplified maintenance, 24kVType W-VAC
Vacuum Circuit Breakers provide reliable control and
protection for electrical equipment and circuits. In
addition, these technologically advanced circuit
breakers provide higher insulation levels in less
space, thus reducing the overall switchgear size.
WARNING
SATISFACTORY PERFORMANCE OF THESE
CIRCUIT BREAKERS IS CONTINGENT UPON
PROPER APPLICATION, CORRECT
INSTALLATION AND ADEQUATE MAINTENANCE.
THIS INSTRUCTION BOOK MUST BE CAREFULLY
READ AND FOLLOWED IN ORDER TO OBTAIN
OPTIMUM PERFORMANCE FOR LONG USEFUL
LIFE OF THE CIRCUIT BREAKERS.
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CUTLER-HAMMER 24kV Type W-VAC Circuit Breaker
Effective 12/98 Page 2of 47
I.B. 8801C71H01
1-3 24kV TYPE W-VAC VACUUM CIRCUIT BREAKER RATINGS (TABLE 1.1)
WARNING
THE CIRCUIT BREAKERS 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 DAMAGE.
ALL SAFETY CODES, SAFETY STANDARDS
AND/OR REGULATIONS AS THEY MAY BE
APPLIED TO THIS TYPE OF EQUIPMENT MUST
BE STRICTLY ADHERED TO.
Table 1.1 Type W-VAC Vacuum Circuit Breaker Rated in Accordance with IEC Standard 56 (1)
Identification Rated
Values
Circuit Voltage Insulation Level Normal Short 3 Second Short Cable
Breaker Class Power Impulse Current Circuit ShortTime Circuit Charging
Type Frequency Withstand Breaking Current Making Breaking
Current Current Amps
kVrms kVrms kV Peak Amperes kArms kArms kA Peak Amperes
240W-VAC16 24 50 125 630 16 16 40 31.5
1250
1600
2000
240W-VAC20 24 50 125 630 20 20 50 31.5
1250
1600
2000
240W-VAC25 24 50 125 630 25 25 63 31.5
1250
1600
2000
(1) Tested and certified by CESI to IEC Standard 56(rated operating sequence 0 - .3 sec – CO – 15 sec – CO).
Typical operating time values: opening 45 ms, closing 75 ms, and reclosing 190ms.
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CUTLER-HAMMER 24kV Type W-VAC Circuit Breaker
Effective 12/98 Page 3of 47
I.B. 8801C71H01
1-4 OUTLINES AND DIMENSIONS
Figure 1-1 24kV Type W-VAC Circuit Breaker Outlines and Dimensions (millimeters)
Up To 1600A
2000A Only
1600A Non Ventilated Uses 2000A
Conductors as Shown Below.
Same as 1250A Breaker,
Except as Shown Dimensionally.

CUTLER-HAMMER 24kV Type W-VAC Circuit Breaker
Effective 12/98 Page 4of 47
I.B. 8801C71H01
SECTION 2: SAFE PRACTICES
2-1 RECOMMENDATIONS
Type W-VAC Vacuum Circuit Breakers are
equipped with high speed, high energy
operating mechanisms. They are designed
with several built-in interlocks and safety
features to provide safe and proper
operating sequences. Cell interlocks used
with drawout circuit breakers are meant to
interact with the appropriate cell interface
and levering mechanism.
WARNING
TO PROTECT THE PERSONNEL
ASSOCIATED WITH INSTALLATION,
OPERATION AND MAINTENANCE OF
THESE CIRCUIT BREAKERS, THE
FOLLOWING PRACTICES MUST BE
FOLLOWED:
•Only qualified persons, as defined in
the Local Electrical Code, who are
familiar with the installation and
maintenance of medium voltage
circuits and equipment, should be
permitted to work on these circuit
breakers.
•Read these instructions carefully
before attempting any installation,
operation or maintenance of these
circuit breakers.
•Always remove the circuit breaker from
its 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 draw out circuit
breaker with a secondary test coupler
engaged. Failure to disconnect the test
coupler could result in an electrical
shock leading to death, personal injury
or property damage.
•Do not work on a closed circuit breaker
or a breaker with closing springs
charged. The closing springs should
be discharged and the main circuit
contacts open before working on the
circuit breaker. Failure to do so could
result in cutting or crushing injuries.
•Do not use an open circuit breaker by
itself as the sole means of isolating a
high voltage circuit. Move the circuit
breaker to the Disconnected position
and follow good lock-out and tagging
rules as well as any other applicable
codes, regulations and work rules.
•Do not leave a drawout circuit breaker
in an intermediate position. Always
have the circuit breaker either in the
Disconnect/Test or Connected position.
Failure to do so could result in a flash
over and possible death, personal
injury or equipment damage.
•Always remove the maintenance tool
from the circuit breaker after charging
the closing springs.
•Circuit breakers are equipped with
safety interlocks. DO NOT remove,
interfere with or in any manner defeat
them. This may result in death, bodily
injury or equipment damage.
•Do not work on a circuit breaker
suspended from a lifting yoke or
chains. Maintenance work should be
performed on a solid work surface,
such as the floor.
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CUTLER-HAMMER 24kV Type W-VAC Circuit Breaker
Effective 12/98 Page 5of 47
I.B. 8801C71H01
SECTION 3: RECEIVING, HANDLING AND STORAGE
3-1 GENERAL
Type W-VAC Vacuum Circuit Breakers are
subjected to complete factory production tests in
accordance with IEC 56 and inspection before
being packed. They are shipped in packages
designed to provide maximum protection to the
equipment during shipment and storage and at
the same time to provide convenient handling.
Tools and accessories, such as maintenance tool,
are shipped separately.
3-2 RECEIVING
If the circuit breaker is not to be used immediately
but is to be placed in storage, maximum protection
can be obtained by keeping it packed as shipped.
Upon receipt of the equipment, inspect the
containers for any signs of damage or rough
handling. Open the containers carefully to avoid
any damage to the contents. Use a nail puller
rather than a crow bar when required. When
opening the containers, be careful to save any
loose items or hardware that may be otherwise
discarded with the packing material. Check the
contents of each package against the packing list.
Examine the circuit 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 detected and
notify the nearest Cutler-Hammer office.
3-3 HANDLING
WARNING
DO NOT USE ANY LIFTING DEVICE AS A
PLATFORM FOR PERFORMING
MAINTENANCE, REPAIR OR ADJUSTMENT
OF THE CIRCUIT BREAKER OR FOR
OPENING, CLOSING THE CONTACTS OR
CHARGING THE SPRINGS. THE CIRCUIT
BREAKER MAY SLIP OR FALL CAUSING
SEVERE PERSONAL INJURY. ALWAYS
PERFORM MAINTENANCE, REPAIR AND
ADJUSTMENTS ON A SOLID WORK
SURFACE CAPABLE OF SUPPORTING THE
CIRCUIT BREAKER.
When the circuit breaker is ready for installation,
a lifting yoke in conjunction with an overhead lifter
or portable floor lifter can be used to move a
circuit breaker. When a circuit breaker is to be
lifted, position the lifting yoke over the circuit
breaker and insert the lifters into the circuit
breaker side openings with the lifting hole toward
the interrupters. Once the lifting yoke is securely
seated in the holes, the circuit breaker can be
carefully lifted and moved.
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CUTLER-HAMMER 24kV Type W-VAC Circuit Breaker
Effective 12/98 Page 6of 47
I.B. 8801C71H01
3-4 STORAGE
If the circuit breaker is to be placed in storage,
maximum protection can be obtained by keeping
it packed as shipped. Before placing it in
storage, checks should be made to make sure
that the circuit breaker is free from shipping
damage and is in satisfactory operating
condition.
The circuit breaker is shipped with its contacts
open and closing springs discharged. The
indicators on the front panel should confirm this.
Insert the maintenance tool in the manual
charge socket opening Figure 3-5 and 4-1.
Charge the closing springs by pumping the
handle up and down approximately 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 (green).
The circuit breaker will close as shown by the
circuit breaker contacts “closed” (white)
indicator. Push the “manual trip” button (red).
The circuit breaker will trip as shown by the
circuit breaker contacts “open” (black) indicator.
After completing this initial check, leave the
closing springs “discharged” and circuit breaker
contacts “open”.
Outdoor storage is NOT recommended. If
unavoidable, the outdoor location must be well
drained and a temporary shelter from the sun,
rain, snow, corrosive fumes, dirt, falling objects
and excessive moisture must be provided.
Container should be arranged to permit free
circulation 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 4 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 air circulation to prevent
condensation. If the building is not heated, the
same general rule for heat as for outdoor
storage should be applied.

CUTLER-HAMMER 24kV Type W-VAC Circuit Breaker
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I.B. 8801C71H01
3-5 TOOLS AND ACCESSORIES
Tools and accessories, both standard and optional are
available for use with the circuit breaker.
(Figure 3-1)
Spin-Free Levering-In Crank:Used to crank breaker
between TEST and CONNECTED positions (Style
701B601G11).
Standard Levering-In Crank: (Style 701B601G12)
Maintenance Tool: Used to charge closing springs
manually (Style 8801C06H01).
Extension Rails: Permits breaker to be withdrawn from
its’ compartment (Style 1C94214G01 & 1C94216G01)
Lifting Yoke:Used to lift breaker (Style 8801C26G03
Up to 1600A, 8801C26G04 for the 2000A)
Portable Lifter:Used to lift breaker to or from
extended rails (Style 1C14504H01)
Test Jumper:Used to operate breaker electrically
while breaker is on extension rails or transport dolly
(Style 8801C11G01)
3-6 TYPE W-VAC VACUUM CIRCUIT BREAKER
WEIGHTS (TABLE 3.1)
Table 3.1 W-VAC Circuit Breaker Weights (1)
Rating Kg.
240 W-VAC 16 630
1250
1600 vented
1600 non-vented
2000
257
259
260
328
336
240 W-VAC 20 630
1250
1600 vented
1600 non-vented
2000
257
259
260
328
336
240 W-VAC 25 630
1250
1600 vented
1600 non-vented
2000
257
259
260
328
336
(1) Does not include shipping carton.

CUTLER-HAMMER 24kV Type W-VAC Circuit Breaker
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I.B. 8801C71H01
Figure 3-1 Typical Tools and Accessories for 24kV Type W-VAC Circuit Breaker
OPTIONAL PORTABLE
LIFTER LIFTING YOKE
STANDARD
OPTIONAL SPIN FREE
LEVERING CRANK

CUTLER-HAMMER 24kV Type W-VAC Circuit Breaker
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I.B. 8801C71H01
Figure 3-2 Front View: 24kV Type W-VAC Vacuum Circuit Breaker
2
3
1
4
1.
Front Cover
2. Levering Latch Release Handle
3. Circuit Breaker Wheel
4Pole Units.

CUTLER-HAMMER 24kV Type W-VAC Circuit Breaker
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Figure 3-3 24kV Type W-VAC Vacuum Circuit Breaker with Front Cover Removed
1
2
3
4
5
6
7
8
9
10
11
12
13
1.
L.H. Closing Spring
2. Motor Cutoff Switch
3. R.H. Closing Spring
4. Opening Spring
5. Manual Charge Socket
6. Ratchet Wheel
7. Charging Motor
8.
Shock Absorber
9. Shunt Trip Assembly
10. Spring Release (Close Coil) Assembly
11. Closing Cam
12. Open/Close Indicator
13. Operations Counter

CUTLER-HAMMER 24kV Type W-VAC Circuit Breaker
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I.B. 8801C71H01
Figure 3-4 Rear View Type 24kV W-VAC Vacuum Circuit Breaker
1
3
2
4
5
1. Pole Unit
2. Primary Disconnect
3. Insulation Shroud
4. Opening to View Contact Pressure Spring Compression
5. Circuit Breaker Wheel

CUTLER-HAMMER 24kV Type W-VAC Circuit Breaker
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I.B. 8801C71H01
Figure 3-5 Type 24kV W-VAC Escutcheon
6
2
7
3
1
4
5
1.
Manual Charge Socket
2. Spring Charged/Discharged
Indicator
3. Rating Nameplate
4. Manual Open Button
5. Manual Close Button
6. Open/Close Indicator
7. Operations Counter

CUTLER-HAMMER 24kV Type W-VAC Circuit Breaker
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I.B. 8801C71H01
SECTION 4: INITIAL INSPECTION AND
INSTALLATION
4-1 INTRODUCTION
WARNING
BEFORE PLACING THE CIRCUIT BREAKER
IN SERVICE, CAREFULLY FOLLOW THE
INSTALLATION PROCEDURE GIVEN
BELOW. NOT FOLLOWING THE
PROCEDURE CAN FAIL TO UNCOVER
SHIPPING DAMAGE THAT MAY RESULT IN
INCORRECT CIRCUIT BREAKER
OPERATION LEADING TO DEATH, BODILY
INJURY, AND EQUIPMENT DAMAGE.
Before attempting to put a circuit breaker in
service, it should be carefully examined and
operated manually and electrically. In addition,
carefully examine the breaker for loose or
obviously damaged parts. The following
information is a guide for performing
recommended checks and tests.
4-2 MANUAL OPERATION CHECK
Refer to Figures 3-5 and 4-1 and then proceed
by placing the maintenance tool into the manual
charge socket opening.
Charge the closing springs with about 38 up
and down strokes of the handle. When
charging is complete and closing Crank goes
over center with an audible CLICK and the
springs Charged/Discharged indicator shows
“Charged”.
Notice:If the springs are to be charged on a
closed circuit breaker, no “click” is heard at the
end of the charging operation. Discontinue
charging and remove the maintenance tool as
soon as the “Charged” flag is fully visible.
Continued attempts to charge further may result
in damage to the mechanism.
Remove the maintenance tool. Close and trip
the circuit breaker. Repeat several times.
4-3 VACUUM INTERRUPTER INTEGRITY
Using a dry, lint free cloth or paper towel, clean
all the accessible insulating surfaces of the pole
units. Conduct a vacuum interrupter integrity
check as described in Section 6.
4-4 INSULATION
Check the primary and secondary insulation as
described in Section 6.
4-5 CONTACT EROSION AND WIPE
Manually charge the closing springs and close
the circuit breaker. Check contact erosion and
wipe as described in Section 6.
4-6 PRIMARY CIRCUIT RESISTANCE
Check the primary circuit resistance as
described in Section 6. The resistance should
not exceed the values specified.
Record the values obtained for future reference.
4-7 NAMEPLATE
Compare the circuit breaker nameplate
information with switchgear drawings for
compatibility.
Figure 4-1 Type 24kV W-VAC Circuit Breaker
Manual Charging Handle in Us
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4-8 ELECTRICAL OPERATION CHECK
After having completed all previous checks and
tests, the circuit breaker is ready to be operated
electrically. It is preferred that this check be
made with the circuit breaker in a TEST position
or by using a test cable, if the circuit breaker is
outside the cell structure.
CAUTION
BEFORE INSERTING THE CIRCUIT
BREAKER EXAMINE THE INSIDE OF THE
CELL STRUCTURE FOR EXCESSIVE DIRT
OR ANYTHING THAT MIGHT INTERFERE
WITH THE CIRCUIT BREAKER MOVEMENT.
WARNING
EXTREME CAUTION MUST BE EXERCISED
TO INSURE THAT PRIMARY CIRCUITS ARE
NOT ENERGIZED WHILE CHECKS ARE
PERFORMED IN THE CIRCUIT BREAKER
COMPARTMENT. FAILURE TO DO SO MAY
RESULT IN PERSONAL INJURY OR DEATH.
The circuit breaker is normally tested electrically
in its cell structure in the TEST position. To
achieve the TEST position, the circuit breaker
must first be placed in the cell structure and the
secondary contacts engaged. To complete this
testing procedure, the operator should first be
familiar with inserting and removing the circuit
breaker into and from the cell structure.
4-8.1 CIRCUIT BREAKER INSERTION AND
REMOVAL
Make certain that the levering nut is all of
the way forward in the TEST position before
attempting to insert a circuit breaker into its
compartment (FIG 4-2).
The extension rails must first be put into
position. Carefully engage the left and right
extension rails to the fixed structure rails and
ensure they are properly seated in place (Figure
4-3). Once the extension rails are properly in
place, the circuit breaker can be carefully
loaded on the extension rails using an overhead
lifter and lifting yoke. Remove the lifting yoke
when the circuit breaker is securely seated on
the extension rails.
Push the circuit breaker into the compartment
(the handles MUST be used to prevent the
breaker from tipping) until the TEST position is
reached as confirmed by the metallic sound of
the breaker levering latch engaging the levering
nut (Figures 4-2 and 4-4). Once the circuit
breaker is in the TEST position, the extension
rails can be removed.
To engage the circuit breaker secondary
contacts, raise the handle to the secondary
disconnect cage and pull the cage forward as
far as possible (Figure 4-5). As soon as control
power is available, the motor will start charging
the closing springs.
WARNING
DO NOT USE ANY TOOL OTHER THAN THE
LEVERING CRANK (Figure 3-1) PROVIDED
TO LEVER THE CIRCUIT BREAKER FROM
TEST OR CONNECTED POSITIONS.
CORRECT OPERATION OF SOME OF THE
INTERLOCKS IS DEPENDENT ON THE USE
OF THE PROVIDED LEVERING CRANK.
PERSONAL INJURY OR EQUIPMENT
DAMAGE COULD RESULT FROM THE USE
OF A TOOL OTHER THAN THE PROPER
LEVERING CRANK.
The circuit breaker and integral levering
mechanism includes all necessary
interlocks that when interfaced with a
compatible Type W-VAC enclosure will
render the circuit breaker mechanism
mechanically and electrically trip-free during
the levering process. For information
pertaining to individual interlocks, refer to
paragraph 4-9 in this section.
To move the circuit breaker to the
CONNECTED position, engage the levering
crank with the structure mounted levering shaft
(Figure 4-6). Turn the levering crank in the
clockwise direction and the circuit breaker will
move slowly into the enclosure. When the
circuit breaker reaches the CONNECTED
position, it will become impossible to continue
turning the levering crank. Secondary contacts
NOTICE
!
!
!

CUTLER-HAMMER 24kV Type W-VAC Circuit Breaker
Effective 12/98 Page 15of 47
I.B. 8801C71H01
will automatically engage if not already engaged
manually in the TEST position.
To remove the circuit breaker from the
structure, reverse the procedure just described
by turning the levering crank in a
counterclockwise direction. Keep in mind that
safety interlocks may cause the circuit breaker
to open and/or close in order to discharge all
mechanism operating springs safely during the
removal process.
For additional information on the levering
mechanism, refer to paragraph 5-6 in this
manual.