REPAIRS AND MAINTENANCE OF HT DISTRIBUTION NETWORK INCLUDING REPAIRS TO VCBs TRANSFORMERS, HT UG CABLES ETC AND CONNECTED WORKS AT CVRDE AVADI

Supply and fix in replacement of shunt trip coil 220/110 or 30 Volts DC complete all as specified and directed.

Supply and fix in replacement of closing trip coil 220/110 or 30 Volts DC complete all as specified and directed .

Supply & Fix in repair fuse element 20A-50A at 2/4pole 11KV structure unit complete all as specified and directed

Supply & Fix in repair new vacuum interrupter 800/630A 11KV rating suitable for HT breaker of approved make or Brand complete all as directed and directed by Engr-In-Charge.

Supply & Fix in repair LED Indication lamps suitable for HT/LT breakers complete all as specified and directed.

Supply & Fix in repair air ventilation fan with wiring of existing panel and taking down unserviceable ventilation fan with wiring complete all as specified and directed by Engg-in-Charge.

Supply & Fix in repairs air ventilation louver arrangement for existing VCB Panel including and taking down Unserviceable air ventilation louver all as specified and directed

Supply & Fix in repairs 200 watt space heater for existing panel complete all as specified and directed

Material & Labour for Inspecting electronic relay (over current relay and earth fault relay) from the 11 KV, VCB and calibrating the relay with the help of secondary injection kit and proper setting of relays and refixing back in existing position testing of proper tripping/ functioning system complete all as specified and as directed.

Material & Labour for proper shutting down and disconnecting the cables from VCB, draw out faulty VCB breakers from panel 1250/ 800/ 630A 13.1 KA rating Indoor type of approved make or brand after removing VCB spout and CT overhauling improving of IR value of hot air oven process and alignment of mechanism including installation in the same location and testing complete all as specified and directed.

Supply and Fix 11 KV Single Phase Indoor resin cast Power Transformer of ratio 11 KV /3/110 V/class 0.5-3, burden 50 VA -50 VA insulation level 28/75 KV Voltage factor 1.2 Con & 1.9 for 30 Sec conforming to IS - 3156 complete all as specified and directed.

Material & Labour for Purification, filtration and Dehydration of transformer oil of transformer installed at various indoor/outdoor sub station by ultra high vacuum filtration machine with stream line filtration plant at a temp 60 to 70 deg. Celsius and achieving minimum dielectric withstand strength of 60 KV for 1 minute in 2.5 mm gap setting (for used oil) complete all as specified and directed by Engineer-in-Charge. Note: (i) Contractor shall ensure no wastage of transformer oil. (ii) Oil required for topping up the transformer will be measured & paid separately. (iii) Contractor shall be ensure that the conservator tanks are full to its level before starting the dehydration

Supply and refilling of new mineral grade transformer oil EHV type confirming to IS-335 to 1983 and for topping up in transformer/ Voltage stabilizer duly filtered with filer plant to obtain high dielectric not less 60 KV (Gap 2.5mm) complete all as specified and directed by Engineer In charge.

Supply & Fix in repairs LT bush assembly brass with double check nuts, washers and oil seal all accessories with bushing insulators for transformer 100 to 500 KVA complete all as specified and directed.

Supply & Fix in repairs HT bush assembly brass with double check nuts, washers and oil seal all accessories with bushing insulators for transformer 100 to 500 KVA complete all as specified and directed.

Supply & fixing in repairs new breather assembly in indoor / outdoor type transformer of capacity up to 1000 KVA filled with fresh blue silica gel connecting with proper rubberized gasket including taking out the unserviceable breather assembly complete all as specified and directed

Supply and filling new silica gel complete all as specified and directed.

Material and Labour for preparing surfaces of transformer of capacity up to 2000 KVA by rubbing old paint and applying two coats of spray painting of approved make from outside complete all as specified and as directed. Note: Painting of transformer will be carried out for plinth mounted and pole mounted transformer, Necessary tools and plants shall be arranged by the contractor. Shut down schedule for painting of transformer will be submitted in advance to plan shut down in the station.

Material & Labour for surface dressing cutting removing of bushes, vegetations trimming of trees and removing the existing aggregate leveling the surface bedding thickness after leveling spreading the aggregate all around the main receiving station/panels/transformer installations and all substations, including clearing the site complete all as specified and directed

Taking out old unserviceable under ground PVC/XLPE HT cable of any size from trenches/ wall/ roof/ road/ pipe/ pole including segregation of serviceable bricks for re-use complete all as specified and as directed.

Supply and Fix in replacement of 3 core, 150 sqmm HT XLPE power cable (heavy duty) insulated, screened PVC bedded, galvanized steel strip or wire armoured, electric with aluminum conductor 11000 volt grade, conforming to IS-7098 (Part-I) laid in trenches / under floor / roads / along poles/ducts etc., complete all as specified and directed by Engg-in-Charge.

Supply and Fix in repairs of cable jointing kit for 11 KV cable for out door end termination Heat shrinkable with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 120 sqmm to 185 sqmm, indoor type complete all as specified and directed.,

Supply and Fix in repairs of cable jointing kit for 11 KV (Earthed) grade cable for straight through heat shrink type joint with jointing material and accessories suitable for 3 core XLPE, armoured aluminium conductor of size 120sqmm to 185 sqmm cable complete all as specified and directed.

Supply and Fix in repairs of cable jointing kit for 11 KV cable for indoor end termination Heat shrinkable with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 120 sqmm to 185 sqmm, indoor type complete all as specified and directed.

Material and labour for Excavation in trenches not exc 1.5 Mtr wide and not exc 1.5M depth in soft/loose soil for laying of cable, pipes etc and getting out in soft/loose soil all as specified and directed.

Returning, filling, including spreading, levelling, watering and well ramming in layers not exc 25cms of soil complete all as specified and directed.

Removing the surplus excavated material/soil to a distance not exc 50Mtrs and depositing, where directed at a level not exceeding 2.5 Mtr above the starting point all as specified and directed.

Supply and spread sand for sand cushioning of cables in trenches all as specified in MES Schedule Part-I and complete all as specified and as directed. Note: Punned thickness only will be measured and paid.

Material and Labour for laying un-reinforced precast concrete cable cover, Class HV, Type I, flat, size 300 mm x 180mm x 40mm, complete all as specified and directed.

Re-laying of old PCC cover for cable protection, laid flat and dry in trenches over the cable , perpendicular to the direction of cable complete all as specified and as directed.

Supply and Fix in repairs of Earthing with G.I. earth plate 600 mm X 600 mm X 6mm thick including accessories, and providing masonry enclosure with cover plate having locking arrangement and watering pipe of 2.7 Meter long etc. with charcoal/ coke and salt complete all as specified and directed.

Supply and fixing of G.I. strip 25 mm X 5 mm on surface or in recess for connections etc. complete all as specified and directed.

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