NIT No MICD 30 of 2026-27 Dated 13.10.2026 overhauling and Testing of set of 3- phase PT system of 11 KV incomer unit and servicing of all VCBs affected by Flashover at Stage 3rd LIS Tral

Complete Servicing of Each Vacuum Circuit Breakers of 11KV panel in the pump house Opening of the panel door, dismantling the cover plate of VCB and checking all vital parts. Servicing of all mechanical and electrical parts of Vacuum Circuit Breaker including spring charge mechanism, interlocks, contactors, cam, gear box, crank, lever, charging shaft, coupling rod and limit switches with automatic starting of charging motors, push buttons for closing & tripping. Cleaning/Checking of the internal surfaces, connections, wiring, circuit breaker using dhoti cloth, high pressure air lower & application of cleaning spray and corrosion inhibitor spray on insulators, contactors, contact links, bearing pins and bus bars. For stubborn dirt use clean cloth . Checking and setting of spring charging motors and allied mechanism (Closing/tripping), lubrication of bearings/pins, flexible connectors connecting movable contacts to lower connection pad, tightening of loose connections. Measurement of insulation resistance between the main circuit terminals also shall be done. Lubricate all non electrical moving/sliding surfaces with light coat of synthetic grease. The job also includes checking of wiring, protection relays etc and cleaning of respective 11KV Panel compartment using high pressure compressed air and repairs to incomer panel current /time setting as per motor current ,DC under voltage/Over voltage Numeral relay ,Digital meters, selector switches , AC/DC controlling MCBs etc

Replacement of damaged copper Bus Bar by way of providing and fitting of new copper Bus Bar 25mm X6mmand 1000 mm long ( 1.34 Kgs approx) for the connecting PT coils in the circuit with high voltage insulation tape heat shrinkable with red ,Yellow and blue colour.The bus bar shall be cut of required size and with precision hole drilled etc

Complete dismantling of the flashover affected PT Cast resin blocks from the Trolley/frame fitted in the11 KV incomer panel and disconnecting all the connections .

General cleaning of PT Coils by way of removal of carbon deposits ,tracking marks, Soot and flash debris using approved solvent/cleaner and grinder . Application of high dielectric epoxy resin coat on scraped surface to with stand 11 KV Stress. All hair line cracks shall remain under the epoxy resin layer . PT coil consists of 01 set of 03 coils

Replacement of burnt out 1.5 mm2 secondary control wiring of PT, installation of high voltage colour coded heat shrinkable sleeves on bus bar links and re -crimping with heavy tinned copper lugs as per requirement

Applying Lacquer spray paint as protective coating for PT trolley/ frame and also inner side of the incomer panel cabin after proper cleaning by standard cleaning agent

Checking /Testing of the PT coils for Insulation resistance (Pre and post repair IR values shall be in limits), winding resistance, polarity checking using specific tools and tackles for job including carriage of equipment to site.

Fabrication /pr/fitting of new spring action fuse contact clip/ terminal connectors /for PT coils assembly of adequate size or as per sample .The clips shall be fabricated out of high conductivity copper strip. The job includes cutting, bending, punching and spring tension setting for fuse contact clip .The job includes electro tin plating /silver plating for low contact resistance and anti corrosion

Pr/Fitting of 11KV AVT type (HRC) PT Fuse of 3.15 Amp Ratings for incomer Panel