REPAIR AND MAINTENANCE OF HT LT UNDERGROUND CABLES EARTHING AND REPAIR AND MAINT OF AVR SUBSTATION HT PRIMARY PROTECTION RELAYS HT SWITCH GEAR SYSTEM TRIPPING CIRCUITS BREAKERS RMUS TRANSFORMERS AND FILTRATION OF TRANSFORMERS VOLTAGE STABILIZERS

Amount

Excavation in trenches n.exc 1.5m wide and n.exc 1.5m in depth for laying cables / poles foundation / stay assembly and getting out in hard / dense soil all as directed by Engr-in -Charge.

Removing excavated material not exceding 50 m and depostingwhere directed at a level not exceding 1.5 m above the starting point.

Returning filling in including spreading levelling watering and well ramming in layers n.exc 25cm all as specified all as directed by Engr-in -charge.

Material and labour for Sand cushioning to under ground cable providing with a layer 8cm thick before laying the cable and 15 cm thick after laying the cable complete all as specified and as directed Note: Punned thickness only will be measured for the purpose of payment.

M & L for Un- reinforced pre cast concrete covers class HV type 300mmx 180mm x 40mm size factory made for cable protection complete all as specified and directed.

M & L for Un- reinforced pre cast concrete covers class LV type 250mm x 150mm x 40mm size factory made for cable protection complete all as specified and directed.

M&L for cutting of black top cover of existing road up to 1 mtr depth and 1mtr wide for laying of UG cable and pipe line, refilling and making good after laying UG cable and pipe line with PCC 1:3:6 up to 30 cm from top of the road surface comple all as directed by EIC.

Supply and laying in replecement XLPE insulated, armoured heavy duty electric cable with aluminium conductor, 1100 volts grade, cross-sectional area 400 Sqmm 3.5 Core including taking up existing old unserviceable LT UG cable complete all as specified and directed

All as per item No 8 above but of size 300 Sqmm 3.5 core

All as per item No- 8 above but of size 240 Sqmm 3.5 core

All as per item no-8 above but of size 185 Sqmm 3.5 core

All as per item no- 8 above but of size 120 Sqmm 3.5 core

All as per item no- 8 above but of size 95 Sqmm 3.5 core

All as per item no- 8 above but of size 70 Sqmm 3.5 core

All as per item no- 8 above but of size 50 Sqmm 3.5 core

Supply laying & testing in replacement of cable XLPE insulated screened PVC bedded, galvanized steel strip or wire armoured, electric power cables (heavy duty)with stranded aluminum conductor,11000 volts grade, of size 3 core 95 Sqmm including taking out of old HT cable from trenches all as specified and directed by EIC.

All as per item No-16 above 120 Sqmm 3 core

All as per item No-16 above 185 Sqmm 3 core

Supply and fix cable jointing kit 11 KV cable for indoor termination heat shrink type joint complete joint material and accessories suitable for 3 core XLPE armoured AL conductor cable of size 50 to 95 Sqmm complete all as directed.

Supply and fixed cable jointing kit 11 KV cable for outdoor termination heat shrink type joint complete joint material and accessories suitable for 3 core XLPE armoured AL conductor cable of size 50Sqmm to 95 Sqmm complete all as directed.

Supply and fix cable jointing kit 11 KV cable for indoor termination heat shrink type joint complete joint material and accessories suitable for 3 core XLPE armoured AL conductor cable of size 120 to 185 Sqmm complete all as directed.

Supply and fixed cable jointing kit 11 KV cable for outdoor termination heat shrink type joint complete joint material and accessories suitable for 3 core XLPE armoured AL conductor cable of size 120Sqmm to 185 Sqmm complete all as directed.

Supply and fix cable jointing kit for 11 KV grade cable for straight through heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE, armoured, Al conductor cable of size 120 Sqmm to 185 Sqmm , Indoor/Outdoor type complete all as directed.

Maintenance/servicing of existing transformer of cap upto 500 KVA including follwing work/operations all as directed and to the entre satisfaction of Engr-in-Charge :- (a) Opening of top plate after disconnection from HT/LT side. (b) Decaning of old transformer oil & keeping it for reuse after centrifusing to required dielectric strength as per IS schedules (c) Checking maintenance of all internal parts as HT/LT coils of all places, HT bushing, internal electrical connections, tap changing gear box. (d) Internal cleaning of tank by taking of complete coil/core of transformer outside and also cleaning of cooling tubes and make it free from sludge deposition. (e) Refilling of oil after repairs / maintenance work. (f) Change of cork Gasket of top cover. (g) Taking meggar value by applying not less than 5000 Volts meggar on HT side and not more than LT side from 500 Volts meggar & recording results. (h) Change of silica jel and glass of oil level indicator of cover both.

All as per item No 24 above but of cap above 500 KVA to 750 KVA

All as per item No 24 above but of cap above 750 KVA to 2000 KVA

M&L for online centrifuging (filtration/ dehydration) of transformer oil including checking di-electric strength of oil before and after filtration for transformers located in Minniebay area with suitable machine having filtration, heating and pumping facility to improve the dielectric strength/ insulation value of oil. Notes :- (i) Di-electric strength of oil after filtration/ dehydration shall not be less than 60 KV/min. (ii) The contactor shall take shut down orders in writing from Engineer-in-charge before commencement of the work. (iii) The contractor shall ensure no wastage of transformer oil. (iv) The di-electric strength of oil shall be tested before & after filtration and test results shall be submitted to Engineer-in-Charge.

Supply and filling new transformer oil for topping up the transformers duly filtered with filtration plant having dielectric strength not less than 60 KV complete all as specified and as directed. [Make : Poweroil/ Electrol/ Servo]. Note :- (a) The transformer oil shall be type EHV confirming to IS - 335/1983. (b) Mineral oil grade shall be used. (c) The IR value of transformer oil shall not be less than 60KV/min. (d) The unit rate shall be deemed to include the cost of filtration to achieve desired di-electric strength.

M & L for opening and dismantling of all electrical connection from buck /boost transformer of 11/11 KV cap 4 MVA for servicing purpose for checking of complete bushing assy including removing leakage of oil / replacement of top gasket and assembling the same after servicing and complete testing of buck /boost transformer by the authorized company representative and test certificate shall be furnished. All as directed by the Engineer-in-Charge (a) Insulation resistance test (b) Oil temperature alarm trip (c) Winding temperature alarm trip (d) Bucholtz relay alarm trip (e) Low oil level alarm trip (MOG) (f) Vector group (g) Di-electric test of transformer oil (h) Short circuit test (j) Magnetic core balance test (MBT)

M & L for opening of all electrical connection from 11 KV automatic voltage regulator and drain out complete oil from the tanks for servicing purpose including opening of top cover and lift the core with help of crane carefully for servicing purpose including servicing of three nos synchronising motor for its better functioning including testing of carbon roller assembly/ cleaning of control contact assembly and replacement of the same if required and replacement of minor worn out parts and replacing of top gas kit complete and reassembling the same including making all connection and testing complete for entire satisfaction of Engr-in-charge. Notes:- 1. Quoted rate by the contractor shall be deem to include for repairing of AVR at site only. 2. Major parts replaced shall be paid seperatly under relevent items of schedule. 3. Test certificate shall be provide by the contractor after serving job done.

Supply and fix in replacement of step synchronise motor with gear box assembly and shaft sprocket 1 ph 230 v 50 Hz 10/15 RPM suitable for 11 KV AVR all as specified and directed.

Supply and fix in replacement of electronic Auto contro PCB suitable for 11 KV Automatic voltage regulator including removing the unsv one and making all connectionas per existing all as specified and directed.

Supply and fix in replacement of flip flop relay suitable for 11 KV automatic voltage regulator all as specified and directed.

Supply and fix in replacement of carbon roller assembly of 11 KV automatic voltage regulator including making all connection and testing complete all as specified and directed.

Supply and fix in replacement tag and tail with sleeving of 11 KV auotamatic voltage regulator including making all connection and testing complete all as specified and directred.

Supply and fix in replacement of pneumatic type on delay timer working on 230V 50 HZ of 11 KV automatic voltage regulator including making all connection and testing complete all as specified and directed.

Material and labour for taking out bottom trolly of HT OCB /VCB11 KV 400/800 Amps capacity after disconnecting power supply and carrying out servicing and maintenance of operating mechanism, latch assembly spring mechanism, checking of electrical control wiring of OCB/VCB and checking for proper functioning of shunt trip coil, lubricating of all moving parts and checking /cleaning of alignment of moving contacts with fixed contact assembly for proper functioning of operation. Reassembling of bottom trolly of HT OCB fixed in its original position and testing for smooth functioning complete all as specified and as directed by Engr-in- charge

M & L for calibration of IDMT relays set of three through relay test kit inlcuding other required measuring equipment to the site by secondary injection method and testing for proper functioning/tripping systems of relays complete all as specified and as directed. Note : The rate quoted by the contractor is deemed to be included for quarterly checking of relays in VCB/OBC for its proper setting/fuctioning and tripping of VCB/OCB during over load/earth fault.

Supply and fixing of HT current transformer of capacity 200 / 100 / 5-5 including testing commissioning of through primary injection method with suitable testing kit and also checking the control panel wiring including setting the CT range with relays setting for proper functioning/tripping and taking out old unserviceable CT complete all as specified and as directed.

Supply amd fixing in replacement of moving contact assembly suitable for HT OCB 11 KV 400 Amps to 800Amp OCB including dismantling the old unserviceable moving contact assembly suitable for HT OCB complete all as specified and as directed. Make:as per existing

Supply and fixing in replacement of big and small end bearing of HT 11 KV VCB trolly including replacement of complete locking mechanism with integral spring charging handle for manual spring charge and replacement of closing coil and triping coil 24V DC including replacement of electro magnetic relay, coil rating 220 V, AC of existing sample of make of Crompton greaves/ABB/Schneider.

Supply and fixing in replacement resin encapsulated vacuum interrupter bottles of the same manufacturers as per existing circuit breaker trolley of 11 KV. Make: ABB/Schneider/L&T/CG

Supply and fix in replacement of spring charge universal motor suitable for 11 KV, VCB,working on 230 volt of existing make i.e CG/Schneider/ABB/L&T ete all as specified and directed.

Supply and fixing in replacement of current transformer moulded in epoxy compound with dual ration 50/25/5 Amps complete connection with copper wire including beading as per existing VCB 11 KV at site all as specified and directed by Engr-in charge.

Dismantling and removing of defective transformer removing to workshop for repair, opening up and taking out coil, core and core assembly for estimation of repair and damaged parts cleaning/washing of tanks and romoving the dust from all parts including cores, tanks, cooling tubes, removal of damaged parts making connection and assembling complete in all respects after repair/ replacement of coils, gasket, sheet, nuts and bolts, refilling of transformer oil, installation and testing on full load for testing for 11 KV capacity from 630 KVA to 1250KVA complete all as specified and directed by the Engr-in-Charge.Note: 1. Spare parts and winding coils as mentioned under respective items of schedule shall be measured and paid for separately as supply only. These shall be identical to those specified by original manufacturer.

Dismantling carefullty and material and labour for rewinding the LT/HT side (primary winding/Secondary windings) of the transformer with copper winding (wire/strip )of suitable gauge or to match the existing including refixing, connecting, testing and commissioning the transformer complete.

Supply and fix in repair HT bushing rod complete with insulator and packing suitable for out door/Indoor type 630 KVA to 1250 KVA transformers confirming to IS-334 complete with nut bolts brass studs and gasket of synthetic rubber bonded cork sheet all as specified and directed by Engr-in-Charge.

Supply and fix in repair LT bushing complete with insulator and packing suitable1100 volt grade complete with nut bolts, brass studs, insulator and gasket etc suitable for 630 to 1250 KVA out door/Indoor transformer. Notes for item No 46 & 47 : 1. Rates quoted by the contractor shallbe deem to include for opening of top plate of transformer/decanning of oil from transformer up the level as per requirement and assemble the same after replacement of bushing rod. 2. Bushing rod shall be replaced at site. transformer will not be allowed to send to workshop at any cost and all bushing replacement work shall be executed at site only.

Supply and fix air breather complete with silica gel suitable for out door type step down power transformer up to 500 KVA to 1250 KVA all as specified and directed by EIC.

Material and labour for spray painting of distribution transformer with two coats of synthetic enamel paint of smoke grey colour after neatly cleaning and preparing the surface for spray painting the transformer of the following capacity including writing SM / MES No (5 cm height) with white enamel paint of cap 1200 KVA to 2000 KVA complete all as specified and as directed.

All as per item No 50 above but of cap 750 KVA TO 1000 KVA

All as per item No 50 above but of cap 500 KVA TO 630 KVA

Supply and fixing in repair LT Air circuit breaker Manual Draw-out Type circuit breaker thermal magnetic DN1 four pole 1250 Amps capacity of 50 KA breaking capacity in existing panel board including modification if required to accommodate the ACB with necessary connectiong with existing bus bar with suitable lugs, nuts, bolts, washers etc including testing commissioning complete and taking out existing unserviceable ACB of any capacity complete all as specified and as directed

Supply and fixing in repair LT Air circuit breaker Fixed Type circuit breaker thermal magnetic DN1 four pole 1250 Amps capacity of 50 KA breaking capacity in existing panel board including modification if required to accommodate the ACB with necessary connectiong with existing bus bar with suitable lugs, nuts, bolts, washers etc including testing commissioning complete and taking out existing unserviceable ACB of any capacity complete all as specified and as directed

M & L for opening of electrical connection from existing ACB upto 2500 Amp and to draw out/ Fixed type from the existing panel for servicing purpose of all mechanical part/cleaning/lubricating of all parts including fixing the same in the panel and testing for entire satisfaction of Engr-in- Charge.

Supply and fixing of tripping coil of Air circuit breaker upto 2500 Amp as per exisitng make and model 220/440 volts all as specified and directed.

Supply and fixing of moving contact circuit breaker upto 2500 Amp as per exisitng make and model all as specified and directed.

Supply and fixing of fixed contact circuit breaker upto 2500 Amp as per exisitng make and model all as specified and directed.

Material and labour for finding out the cable fault of any size of cable upto 11 KV underground cable (HT and LT and of any capacity of cable with the help of cable fault loacator mounting on vehicle and with nessary disconnection of cable from two ends and making connection by joing after repairs and having the following items with electrician at site to find fault of up to length of 10 KM cable complete all as specified and directed by Engr-in-Charge with help of the following accessores- (a) Surge Generator with accessories (b) Head Phone (c) Pin Point Set T-505 with accessories (d) Earthing cable with clamp (e) Cable fault Locator T-905 with accessories (f) TC-808 with accessories (g) Soldering Iron/wire/capacitor unit/capacitor connecting cables/ power cable/nose plier. Notes: Excavation for the cable fault shall be done by the contractor by his own arrangement.

M & L for opening of all connection of electric power cable of any size from the electrical panel , cleaning and replacing of aluminium lugs of existing cable of size upto 400 Sqmm upto 20 Nos in each panel and checking of all electrical wiring of panel and servicing of bus bar strip changing etc and tightening of nuts and bolts and making all connection as per original including testing for entire satisfaction of Engr-in-charge.

Supply and fix in replacement Digital Ammeter, 11 KV, size 96 x 96 mm including taking down the existing one all as specified and as directed. Make: Schneider / L&T / Elmeasure

Supply and fix in replacement Digital Voltmeter, 11 KV, size 96 x 96 mm including taking down the existing one all as specified and as directed. Make: Schneider / L&T / Elmeasure

Supply and fix in replacement MD XL type 10 KVAR to 20 KVAR capacitor 440 volt, 3 Phase, , voltage test between terminals 1.75 rated volt including taking out u/s all as directed by Engs-in -charge. Make- Neptune, SIMENS, L&T

All as per item No 63 but 25 KVAR

Supply and fix in repair Moulded Case Circuit Breakers for Distribution Network with thermal magnetic release type DPX 250 3 pole 100 Amps capacity 16 KA rupturing capacity in existing panel board including modification on existing panel if required, necessary connectioning with copper strips/suitable size of copper conductor wire from bus bar, provison of suitable size of copper lugs as per the out going cable including taking down unserviceable MCCB complete all as directed Make : Indo Asian/L&T/ABB/Schneider/ Legrand

All as per item No 65 above but 3 pole 160 Amp 36 KA. Make :Indo Asian/L&T/ABB/Schneider/ Legrand

All as per item No 65 above but 4 pole 200 Amp 36 KA .Make : Indo Asian/L&T/ABB/Schneider/ Legrand

All as per item No 65 above but 4 pole 250 Amp 36 KA .Make :Indo Asian/L&T/ABB/Schneider/ Legrand

All as per item No 65 above but 3 pole/4pole 400 Amp 36 KA .Make : Indo Asian/ L&T/ ABB/ Schneider/Legrand

All as per item No-65 but 3 pole/ 4 pole 630 Amp 50 KA. Make : Indo Asian/ L&T/ ABB/ Schneider/ Legrand

Supply and fix steel MCCB enclosure on wall suitable for fixing of MCCB of 3 pole/4 pole cap upto 250 AMP all as specified and directed by Engr-in- charge

Supply and fix steel MCCB enclosure suitable for fixing of MCCB of 3 pole/4 pole cap upto 315 Amp to 630 Amp AMP all as specified and directed by Engr-in- charge

M & L for repair of LT panel board by replacement of broken/unserviceable front door of LT panel made out of 3.15mm thick MS sheet to shape for proper closing the front door in two parts inclusive making locking arrangement of LT panel and welding of new hinges including spray painting of panel boaard all as specified and directed by Engr-in-Charge

Supply & laying Synthetic Insulating Mat of size 2.00Mtr x 1.00Mtr x 2.5 mm thick suitable for upto 33KV grade all as directed.

Trimming of tree/branches including cutting of grass at substation and surronding upto 5 Mtr radius and removing the grass and branches and transporting the same out side the labs all as specified and directedby Engr-in- Charge.

S&F distilled water best quality suitable for lead acid battery, complete all as specified and directed by Engineer-in-Charge.

Supply and fix in replacement of battery, 12V, 180 AH, dry type including testing for its proper functioning as specified and directed by EIC. Make:- Exide/Amron.

M & L for servicing of 415 Volt electrical panel indoor /outdoor type for for cleaning of dust particle inside the panel like MCCB , relay/contactor with help of blower etc and tightening of all electrical connection and complete testing and replacement of burnt lugs etc all as specified and directed.

Supplying, spreading & leveling graded course stone aggregate of 40 to 80 mm size to the existing sub station all as specified and as directed. Note :- Aggregate nominal size without any vegitation or chemical including levelling/spreading surrounding transformer, HT/LT 2/4 pole structure and LT/HT panel complete all as directed .

M & L for earthing complete with copper earth plate of size 600 x 600 x 3.15 mm buried directly in ground (earth pit not less than 3 mtr deep below ground level) with top edge of the plate not less than 2.1m below normal ground level, connected to and including copper earth strip of 20x3mm by means of rivetting and brazing and protected by GI pipe light grade of suitable size up to the test point , ie upto 7.5m, including providing alternate layers upto full volume of pit by charcol dust and common salt, magnesium sulphate and vegetable soil all around the plate 15cm depth and width minimum including PCC pit chamber, watering pipe of 50mm dia medium grade HI pipe upto the top of the plate having funnel complete and RCC cover, connecting to the test point and testing on ground complete and including excavation and earth work in any type of strata and cleaning of site all as specified and as directed in MES SSR Part-I and directed Note: 1. Rate quoted shall deemed to include cost of excavation in any type of strata, RFR and removal upto 50metre, PCC pit, funnel and RCC cover plate. 2. Copper strip above 7.5m will be measured and paid seperately. 3. Earth resistance not exceeding 1.0 ohm.

M & L for copper earth continuity main earthing lead fixed to wall on batten or recess or chases or buried in ground or drawn in conduit of size 20 x 3 mm all as specified and directed.

Earthing complete with galvanised iron plate electrode 600 x 600 x 6.00mm thick GI earthing lead burried directly in ground vertically to a depth not less than 2.25 mtr deep below GL with the top edge of the plate at a depth not less than 1.5 mtr from below normal GL, connected to and including Galvanised iron strip 32x6 mm as earthing lead by means of nuts, bolts, washers, checknuts of galvanised iron and connected to earthing test point all as shown in electric plate No. 3 of SSR Part l of 2010 and as specified or indicated and testing on completion including excavation / earth work in any type of strat PCC (1:3:6) type C1 earthing chamber, pre cast slab 50 mm thick in cement cioncreat (1:2:4) type B1 (Reinforced with welded steel wire fabric (XPM)) weight not less than 4 Kg/sqm,cast iron frame, funnel with wire mesh, including GI earth strip with GI protection pipe of 40mm medium grade 7.5 meter long etc complete and testing on completion all as specified and directed. Note: 1. Rate quoted shall deemed to include cost of excavation in any type of strata, RFR and removal upto 50metre, PCC pit, funnel and RCC cover plate. 2. GI strip above 7.5m will be measured and paid seperately. 3. Earth resistance not exceeding 1.0 ohm.

Earth continuity conductor or main earthing lead fixed to wall on batten or recess or chases or buried in ground or drawn in conduit/pipe or fixed to poles or any other indicated situation for loop earthing etc. as required 32 x 6 mm galvanised iron or steel wire

Supply and installing 300mm width x 50mm depth x 2mm thickness size of perforated hot dipped Galvanised Iron cable tray (Galvanisation thickness not leass than 50 microns) with perforation not more than 17.5% inconenient sections, jointed with connectors, suspended from the ceiling with GI suspenders including GI Bolts & nuts as required all as specified and directed. Note : 1. All necessary fixing/ connecting arrangements of nut, bolt, MS rod, to be provided by the contractor without any extra payment from department. 2. Quoted rate is to be deemed the charges of necessary boom lift.

Supply and fix cable route indicator comprises and made out of PCC pole (0.3 x 0.3 x 1.5 Mtr) on HT cable 1 mtr in depth grouted in the ground with suitable PCC 1:3:6 concrete base with writing HT CABLE/JOINT complete all as specified and directed

devan enterprises

G.L.THIRUMALAI NAIDU AND COMPANY

HEERA CONSTRUCTION CO.

RAHUL ENTERPRISES

G K CONSTRUCTIONS

KARTHIK INCORPORATE

Lucky Enterprises

GS TRADERS