S.O.P.
OF EQUIPMENT
SOP
NAME OF EQUIPMENT
VACCUM CIRCUIT BREAKER
Prepared by Verified by Approved by
Name:
Designation: Engineer AGM Electrical
Vice-President
VACCUM CIRCUIT BREAKER
A-DURING OFFSEASON
I- DISMENTALLING
1. Trip/ Switch off the breaker.
2. Switch off the Breaker Main incomer power supply.
3. Disconnect the Control supply RS-232 Connection port from breaker.
4. Unlock the breaker Lock.
5. Draw-Out the movable Chamber from the breaker.
11- CLEANING AND IDENTIFICTION OF WORN OUT SPARES/PARTS:
1. Surface/Body cleaning by Air blowing/ Dry Cotton.
2.Draw-out the breaker movable chamber internal inspection.
III PERSRVATION OF CRITICAL SPARES OR EQUIPMENTS
1. Preserve the Movable chamber at safe & secure location to prevent the dust effect.
2. Cover the Movable chamber with polythene covers.
IV- SERVICING AND REPLACEMENT OF SPARE/PARTS-
1. Cleaning with blower/ Cotton cloth.
2. Check the tulip contactors male & female on the breaker.
3. Check the Spring charger 1 phase motor condition.
4. Clean the fixed chamber of the VCB.
5. Check the Bus bar tightness.
6. Check the Cts and Pts condition in the breaker.
IV- ASSEMBLY
1. Assemble the Vacuum Circuit Breaker.
2. Movable Chamber Fix with breaker (IN).
3. Connect the Control supply RS-232 to the breaker.
4. Finally close the Doors/ enclose.
V- INSPECTION AND TESTING:
Vacuum Integrity Test Procedure :
1. Observe safety precautions listed in the danger and warn ing advisories. Construct the
proper barrier and warning light system.
2. Ground each pole not under test.
3. Apply test voltage across each pole for one minute (Circuit Breaker open).
4. If the pole sustains the test voltage for that period, its vacuum integrity has been verified.
As-Found Insulation and Contact Resistance Tests :
As-Found tests verify the integrity of the circuit breaker insulation system. Megger
or insulation resistance tests conducted on equipment prior to installation provide
a basis of future comparison to detect changes in the protection afforded by the
insulation system. A permanent record of periodic As-Found tests enables the
maintenance organization to determine when corrective actions are required by
watching for significant deterioration in insulation resistance, or increases in
contact resistance.
Insulation and Contact Resistance Test Equipment
Insulation and Contact Resistance Test Procedure
Inspection and Cleaning of Circuit Breaker Insulation
VI- SKETCH SHOWING CRITICAL PARTS--- NA
VII- PHOTOS BEFORE AND AFTER
B- DURING SEASON
I- START UP PROCEDURE
Vacuum Circuit Breaker Operation (To Close the Breaker)
1. In the HT Panel keep the Selector switch in Local mode
2. Check the indicators R,Y and B are glowing on respective HT incomer feeder
3. Check Vacuum breaker spring is in charged condition by visually.
4. checking the indicator in the breaker panel .
5. If not charged then charge using manual charger rod.
6. Check and ensure that protective relays (Over current, Earth fault.
7. Earth Leakage, Over/Under Voltage etc) are in normal mode, reset if required.
8. Ensure that VCB OFF indication lamp is glowing
9. Ensure that Trip circuit healthy lamp indication is glowing
10. Turn the "TNC" control switch towards "C" position .The Arrow indicator in
Vacuum breaker towards
11. "BREAKER ON". This means the Breaker is closed. The BREAKER ON
indication lamp will also glow
12. 12. Power can now be distributed to other feeders.
Vacuum Circuit Breaker Operation (To Open the Breaker)
13. 1. Turn the "TNC" control switch towards "C" position .The Arrow indicator in
Vacuum breaker towards "BREAKER OFF". This means the Breaker is closed. The
BREAKER OFF indication lamp will also glow
14. If the Breaker is not opened electrically with "TNC" selector switch, push the OFF button in the
Vacuum Breaker.
II- Flow Diagrams - NA
III- WORK INSTRUCTIONS FOR THE OPERATORS:
1. Periodically check the running condition by observe the Noise..
2. Observe trip Indications of the breaker.
3. Observe any abnormal sound.
IV- AUTOMATION/PROTECTION AND INTERLOCKING
1. Always perform maintenance on the circuit breaker after the spring-charged
mechanisms are discharged.
2. Always let an interlock device or safety mechanism perform its function
without forcing or defeating the device.
V- PREVENTIVE MAINTAINANCE DURING CLEANING PERIOD.
1. Checks of the Primary Power Path
2. Cleanliness Check.
3. Inspection of Flexible Connectors.
4. Checks of the Stored Energy Operator Mechanism.
SAFETY PRECAUTIONS:
COVERALLS – Coveralls must be worn when removing solid arc products.
Coveralls are not required after all solid arc products are cleaned up. Disposable
coveralls are recommended for use when removing solid arc products; however,
regular coveralls can be worn if disposable ones are not available, provided they are
washed at the end of each day.
HOODS – Hoods must be worn when removing solid arc products from inside a
faulted dead-tank circuit breaker.
GLOVES – Gloves must be worn when solid arc products are died. Inexpensive,
disposable gloves are recommended. Non-disposable gloves must be washed in
water and allowed to drip-dry after use.
BOOTS – Slip-on boots, non-disposable or plastic disposable, must be worn by
employees who enter eternally faulted dead-tank circuit breakers. Slip-on boots are
not required after the removal of solid arc products and vacuuming. Non disposable
boots must be washed in water and dried after use.
SAFETY GLASSES – Safety glasses are recommended when handling solid arc
products if a full face respirator is not worn.
SPECIFICATIONS- As per enclosed list.
COGEN VCB LIST:
