NIT_NO_18 (2021-22) EE(SDW)-XI_ITEM_NO_03

Servicing / Overhauling of 11 KV HT Panel Jyoti make NO.1 to 5 at Pragati Vihar Sewage Pumping Station by carrying out the following work:- Voltmeter 0-5KV,

Multifunctional meter

Ammeter 0-75A,

Ammeter 0-150A,

Illumination lamp

Indication lamp with dome R,G,B,Y,A.

TNC switch

HRC fuse(2A, 4A, 6A, 10A)

RE-300 Relay 30 V DC

PT fuse

75S 2pole limit switch

75T 2pole limit switch

Micro switch

Terminal Block 10 Amp

Bridge rectifier

Spring charging motor

Barker Assembly awitch assy.

PDS assembly forvk10j25

RE300-Relay 110VDC

RE300-Relay 220VDC

Pinion Gear

Spur Gear

Tripping half shaft

Closing half shaft

Tripping coil assembly 30 VDC

Closing coil assembly 30 VDC

Power pack 220VAC/30 VDC

Servicing of Jyoti Make bus coupler VCB by 1. Visual Inspection and Cleaning of Breaker. 2. Lubrication of moving parts of mechanism. 3. Checking the operation of closing and tripping coil. 4. Checking of test/service aux. switch operation. 5. Checking of tripping mechanism operation. 6. Checking of Breaker Aux. switch operation. 7. Checking of spring charging limit switch Operation. 8. Checking of damper setting. 9. Measurement of stoke gaps for VI contacts in VCB/VC and adjustment if required 10. Tightness checking of Power Connection of VCB/VC and electrical wiring in breakers. 11. Checking and tightening of Nuts / Bolts and other fasteners in VCB/VC. 12. Checking of all circlips and lock washers of VCB/VC. 13. Checking of Breaker on/ off operation manually and electrically. 14. Cleaning Of U-barrier. 15. Cleaning of Jaw Contacts. 16. Checking the alignment of breakers with the male contacts of panel. 17. Checking the anti- pumping operation in VCB/VC. 18. Replacement of defective parts. 19. Measurement of contact Resistance, HV Test, closing & tripping timing. 20. Scope also including complete servicing of Panel and replacing the recommended Spares as taken in the Supply Part

DISHA ENGINEERS