REPAIR AND MAINTENANCE OF HT VCB TRANSFORMER AND CONNECTED WORKS AT TECHNICAL AREA AT CVRDE AVADI

Amount

M&L for Servicing HT VCB panel cum breaker 1250/800/630A 13.1KA rating Indoor type make of SEIMENS/ CROMPTON/SCHINDER after taking proper shut down and disconnecting the cables from panel draw out VCB breakers, earth fault relay, checking alignment of VCB isolating contact, servicing of operating mechanism including tripping and closing system of the breakers, dehydrating, decarburizing of panel, bus bar section & circuit section including incoming/ outgoing cables, provide necessary HT insulation at joints. Removing perished monoplus compound cleaning and re-insulating with HT taps wherever necessary, with and including replacement of worn-out/defective spares like tension springs, torsion springs, nut bolts, washers of suitable size, lingers and de-carbonizing all joints, bus bar, CTs, PTs spout metal parts and making VCB perfect operation in manual and electric mode including all routine and preventive maintenance of breaker under the supervision of authorized dealer /representative and reconnecting the panel/breaker in its original position and testing all as specified and directed.

Note: - (i) The rate quoted inclusive of all minor spares etc.

(ii) Spares parts required other than mentioned here-in-after shall be deemed to be included in the quoted rate.

Supply only shunt trip coil 220/110 or 30Volts DC

Supply only closing trip coil 220/110 or 30Volts DC

Supply only panel space heater 80W complete all as specified

S&F in fuse element 20A-50A at 2/4pole 11KV structure unit complete all as specified and directed.

Supply only New vacuum interrupter 800/630A 11KV rating suitable for SEIMENS/CROMPTON/SCHINDER HT breaker all as directed by Engr-In-Charge

S&F in repair LED Indication lamps suitable for HT/LT breakers 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.

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.

Retruning, 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 materisl/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 all as directed. Note: Punned thickness only will be measured and paid.

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

Relaying/ re routing of old serviceable under ground PVC/XLPELT cable any grade and any size in trenches/fixed to wall/pole/roof/laid in floor including necessary connections and thimbling complete all as specified and as directed. (Earth work, brick & sand cushioning shall be measured and paid for separately under appropriate item).

M & L Taking down old unserviceable identification board and supply and fixing of new ACP sheet of 2 mm thick on the existing VCB/LT panel. The background of board to be provided with blue colour and white colours letters. Note: The size of letters and description shall be all as per sample approved by Engr-in-Charge.

M & L Taking proper shut down and disconnecting the cables from VCB, draw out faulty VCB breakers from panel 1250/800/630A 13.1KA rating Indoor type make of SEIMENS/ CROMPTON/SCHINDER after removing VCB spout and CT overhauling improving of IR value of hot air oven process and alightnment of mechanism including installation in the same location and testing complete all as specified and directed.

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

M& L 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

M&L (in repair) cable jointing kit for 11 KV cable for indoor end termination cold shrink with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 120 sqmm to 185 sqmm, indoor type all as directed.

M&L (in repair) 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 all as directed.,

M&L (in repair) 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 all as directed.,

M&L (in repair) 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.

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 with grey deco paint 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.

Supply and laying HT XLPE insulated, screened PVC bedded, galvanized steel strip or wire armoured, electric power cable ( heavy duty ) with aluminum conductor 11000 volt grade, cross sectional area 150 Sqmm, 3 core (earthed) conforming to IS-7098 (Part-I) laid in trenches / under floor / roads / along poles/ducts etc. all as specified and directed

M&L for defect rectification in HT 11 KV cable laid in trenches by locating fault with the help of electronic fault locator machine comprising of surge generator pulse fault location with high frequency distance calculator etc. Excavation in any type of soil strata exposing the cable fault removal of deteriorated position of cable treating of cable and keeping the same ready for jointing work for cables of size up to 240 Sqmm 3core.

Notes for Srl. Item No.50 : (i) The contractor shall bring the fault locating equipment at site with in 02 hours of instructions received from Engineer -in- charge and he shall ensure that the fault is rectified with in 24 hours of receipt of intimation from Engineer-in-charge failing which recovery of Rs. 500.00 per hour shall be recovered from the contractors dues w.e.f the time immediately after the expiry of 24 hours duration.

(ii) For the purpose of payment one unit of “each job” shall comprise of detection of faults in a particular stretch of cable which are identified in that particular stretch , irrespective of number of defects / faults in that particular stretch which are detected during fault detection and the contractors unit rate quoted shall be deemed to include for the same and all such defects / faults which are detected in that particular stretch shall be considered as one unit. (iii) Joints, jointing materials and cable required shall be measured and paid for separately.(iv) The payment is not applicable for error fault finding location.

S&F in replacement of LT bush assembly brass complete with double check nuts, washers and oil seal all accessories with bushing insulators for transformer 100 to 500 KVA

S&F in replacement of HT bush assembly brass complete with double check nuts, washers and oil seal all accessories with bushing insulators for transformer 100 to 500 KVA

Taking out the unserviceable breather assembly complete form indoor/outdoor type transformer capacity up to 1000 KVA and supply and fixing the new breather assembly complete filled with fresh blue silica gel including connecting with proper rubberized gasket complete al as specified and directed

S&F new silica gel complete all as directed.

Supply and laying/spreading 40 mm graded gravel(stone aggregate) 40mmthick, bedding thickness of 100 to 150mm in any position at electrical 2/4 pole structure all as directed.

M&L for Inspecting electronic relay (over current relay and earth fault relay) from the 11 KV VCB and calliberating 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.

only Labour to surface dressing cutting removing of bushes, vegetations trimming of trees and removing the exisitng aggregate leveling the surface bedding thickness after leveling spreading the aggregate all around the main recieving station/,panels/transformer installations and all substations, including clearing the site all as specified and directed

S & F of New air ventilation louver arrangement for existing VCB Panel including and taking down Unsv air ventilation louver all as specified and directed

S & F air ventiltion fan with wiring of exisitng panel and taking down unsv ventilation fan with wiring complete all as specified and directed

S & F 200 watt heater for exisitng panel and taking down unsv heater complete all as specified and directed

SRIRAM ELECTRICALS

G.L.THIRUMALAI NAIDU AND COMPANY