REPAIR MAINT OF HT INSTALLATIONS HT VCBS HT CABLES AND DISTRIBUTIONS TRANSFORMERS AT JALAPAHAR UNDER AGE(I) DARJEELING

Amount

Excavation in trenches not exceeting 1.5 m wide and not Exceding 1.5 m in depth and getting out in soft/loose soil for laying cables all as specified and directed.

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

Removing excavated material not exceeding 50 m and depositing where directed at a level not exceeding 1.5m above the starting point all as specified and directed.

Supply and spread dry river sand in cable treches 8cm below and 15cm above the cable and gently pun down 18cm as in cable cushion all as specified and directed. Note - Thickness of 18cm after punning down will be measued and paid

Supply and fix precast concrete cable covers class HVP type 1, flat size 300 x 180 x 40 mm grade concrete for cable protection after taking out the old damaged cover all as directed and specified by Engr-in-charge.

Supply and lay GI pipe 80mm dia light grade of following sizes for cable protection laid in trenches/structures/walls including necessary MC clamps, Bolts, nuts, fastners etc after taking out the rusted pipes from the trenches all as specified and directed.

Dismantling ACSR conductors and deposited to MES store yard for reuse all as specified and directed.

Dismantling earth wire or copper conductor, service feeder or distributor span all as specified and directed.

Dismantling & taking down insulators any type and size all as specified and directed.

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Dismantling & taking down cross arms or MS channel or angle section etc complete and diposited to MES store yard for reuse all as specified and directed.

Supply, Laying & testing cable XLPE insulated screened PVC beded, galvanised steel strip or wire armoured, electric power cables (heavy duty) with stranded aluminium conductor, 11000 volts grade, of size 3 core 95 Sqmm all as specified and directed.

Supply, Laying & testing cable XLPE insulated screened PVC beded, galvanised steel strip or wire armoured, electric power cables (heavy duty) with stranded aluminium conductor, 11000 volts grade, of size 3 core 70 Sqmm all as specified and directed.

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Supply and fix cable end joint kit heat shrinkable outdoor suitable for 11KV 3 core, 50/70/95 Sqmm HT XLPE armoured UG cable after cutting out the faulty joint all as specified and directed.

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M & L for pin type, porcelain, vitreous, white, brown or green insulator including one galvanised mild steel spindle, two galvanised iron washers and one galvanised iron nut, 150mm height, 150mm dia for 11000 volts grade all as specified and directed.

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M&L cross arms, bracings, supports clamps and back plates fabricated from structural steel sections, including nuts, bolts, washers, welding, bending cold or hot drilling holes for bolts in any shape or size as indicated or directed and inclusive of one primer coat one under coat and one finishing coat of aluminium paint complete all as specified and as directed.

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M & L for steel tubular swaged poles complete with cast iron base plate, finial plug, bolts, nuts & screws as specified type 410 SP-55 (11.00 Mtr) all as specified and directed.

Material and labour for PCC 1:3:6 type C2 using 40 mm graded stone aggregate for poles/stay assembly foundation and mass concrete including necessary form work all as specified and directed.

Material and labour for PCC 1:2:4 type B1 using 20 mm graded stone aggregate for coping of foundation including necessary form work all as specified and directed.

Material and labour in repair for mechanically gang operated air break switch 11KV mounted on 12 nos. insulator and steel frame with operating mechanism worked from ground level complete with drop out fuse (set of three) of rating 400 amps all as specified and directed.

Servicing / calibration / trouble shooting / repairing / adjustment of over current relay, earth fault relay, Spring, spring charge mechanism, close coil, trip coil, including connected accessories cleaning of all contacts with CTC, of the 11KV HT VCB panel of 630A, 50 Hz by qulified technical personel to make functional in all respects including identifying the deffective parts all as specified and directed.

Supply and fixing following spares in repairs suitable for 11KV HT VCB of maximum short circuit current rating 25/26.3 KA 630A/400A after taking down the old spares all as specified and directed.-

LED indicating lamps R/Y/B

LED indicating lamps amber

LED indicating lamps white

Trip circuit push button with NO contracts.

Limit switch

ZZ, microswitch

Big gear assembly

Small gear assembly

Tripping shaft assembly

Closing shaft assembly

Segment gear

PT fuse

Closing coil assembly 110V DC

Tripping coil assembly 100V DC

7NO + 7NC auxiliary switch

Space heater

Thermostat

HRC control fuse 2A, 4A, 6A 10A

Holding catch assembly

Breaker controler

ON/OFF push button plate assembly

Breeze rectifier

Fuse base with carrier

Test & service switch

M & L for disc type insulator, porcelain, vitreous 145mm high and 255mm dia ball and socket type, white, brown or green two-in-series assembly for tension with tension clamps for conductors, working pressure 11000 volts all as specified and directed.

Earthing complete with galvanized steel earth plate electrode 600x600x6 mm thick buried directly in ground (earth pit not less than 2.25 m deep below normal ground level) with top edge of the plate not less than 1.5 m below normal ground level connected to galvanized earth strip 32 x 6 mm (up to 7.5 m in length from earth plate ) by means of bolts and nuts checknuts and washers of galvanized iron or steel all as specified and shown in electrical plate no 3 of SSR part I including necessary excavation and earth work in any type of soil PCC 1:3:6 type C1 chamber with RCC 1:2:4 type B1 40 mm thick cover with MS rod 8mm dia 150mm long reinforcement, watering funnel, 40 mm dia light grade for protection of earth electrode 20 mm dia for watering all as specified and directed and tested on completion all as specified and directed.

Disconnecting and removing transformer from mounting platform/structure after disconnecting HT/LT side cable connections, draining out transformer oil for repair/periodical maint of transformer of following capacity all as directed by Engr - in- Charge.

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50 KVA to 100 KVA

150 KVA to 200 KVA

250 KVA to 350 KVA

400 KVA to 500 KVA

Disconnecting and removing transformer from mounting platform after disconnecting HT/LT side cable connections and transporting of unserviceable transformer for rewinding from MES sub station to contractors/civil workshop and vice versa by arrangement of necessary crane for taking down loading / unloading and refixing at site of following capacity all as specified and directed.:-

50 KVA to 100 KVA

150 KVA to 200 KVA

Opening the top cover lid and taking out the core with winding by means of Crane/Chain Pulley without any damage to core and winding after disconnecting all internal connection of coil with outgoing/incoming terminals and keeping aside for periodical maint such as cleaning of transformer core and winding, cleaning of oil tank, repair/replacement of unserviceable /Burnt parts of following capacity all as specified and directed by Engr -in-Charge.

50 KVA to 100 KVA

150 KVA to 200 KVA

250 KVA to 300 KVA

400 KVA to 500 KVA

Periodical maint of transformer such as cleaning of core and winding by means of washing by hosing down with clean dry oil to remove dust/sludge on core and coil, including cleaning of oil tank to remove sludge deposit, replacement of rusted gasket set, burnt spindle, broken/unserviceable HT and LT ceramic bushing , broken arc horn surge arrester, replacement of silica gel for transformer of following capacity all as specified and directed by Engr-in-Charge.

50 KVA to 100 KVA

150 KVA to 200 KVA

250 KVA to 300 KVA

400 KVA to 500 KVA

Note for iteam No 27.01 to 27.04: (i) Cost of Transformer oil for cleaning by hosing down shall be deemed included in the rate quoted. (ii) Gasket set, LT/HT side ceramic bushing, spindle for HT/LT side and arc horn surge arrester for replacement shall be measured and paid under relevant item

Re-fixing of transformer core and windings by means of Crane/Chain Pulley without any damage to core/windings including re-filling/ topping up dehydrated new transformer oil after carrying out the maintenance/repair and making internal connection on LT/HT side and re-fixing of top lid cover, installing on mounting platform, making connections with HT/LT feeder and testing on load for transformer of following capacity all as specified and directed by Engr-in-Charge.

50 KVA to 100 KVA

150 KVA to 200 KVA

250 KVA to 300 KVA

400 KVA to 500 KVA

Note for item No 28.01 to 28.04 :- New transformer oil for topping up shall be measured and paid under relevant item. The dielectric strength of the same shall be tested by contractor before filling in transformer.

Rewinding of transformer of under mentioned capacities by super enameled copper wire as per existing guage of primary coil with `E’ class insulation, varnishing and heating the coil properly, fixing on core and making connection to achieve rated voltage and current of followings all as specified and directed by Engr-in-Charge.

50 KVA to 100 KVA

150 KVA to 250 KVA

Rewinding of transformer of under mentioned capacities by super enameled copper wire as per existing guage of secondary coil with `E’ class insulation, varnishing and heating the coil properly, fixing on core and making connection to achieve rated voltage and current of followings all as specified and directed by Engr-in-Charge:-

50 KVA to 100 KVA

150 KVA to 250 KVA

Supply only brass spindle for terminal on HT side threaded complete with nut, washers etc of suitable dia for transformer of following capacity all as specified and directed. :-

63 KVA to 100 KVA

150 KVA to 250 KVA

300 KVA to 500 KVA

All as per item No 31.00 here-in-before but for LT side of transformer of following capacity all as specified and directed.:-

50 KVA to 100KVA

150 KVA to 250 KVA

300 KVA to 500 KVA

Supply only ceramic bushing on LT side of transformer of following capacities all as specified and directed. Make : Mysore potteries/BHEL/ Bikaner ceramic's.

All as per item No 33.00 here-in-before but for HT side of transformer of following capacity all as specified and directed. :-

Supply only gasket set for transformer top lid cover, LT and HT terminal bushing suitable for transformer of following capacity all as specified and directed. :-

50 KVA to 100KVA

150 KVA to 200 KVA

250 KVA to 300 KVA

400KVA to 500 KVA

Dehydration/filtration of transformer oil by means of centrifugal filtration plant to achieve the specified dielectric strength of 35 to 40 KV at 2 mm gap in existing possession of transformer of any capacity and transformer oil for topping up at various sub-station all as specified and directed by Engr-in-Charge.

Supply only transformer oil of approved quality having dielectric strength not less than 60 KVA, tested in 4.0mm gap, IS marked (Make: Savita/Poweroil) for filling in transformer for topping up all as specified and directed by Engr-in-Charge.

Cleaning of 11KV main receiving station and (Main Power House area) and substations by removing unwated grass/cutting bushes or any unwanted materials all as specified and directed by Eng-in-Charge.

Material and labour for spreading and leveling of unbroken river stone aggregate for loose filling of gauge 40mm to 80mm graded complete all as specified and directed by Engr-in-Charge

Taking down the existing unserviceabe Distribution panel board with conventional type switches, unserviceable MCCBs from Panel boards, controls and removing from site for further disposal and all as specified and directed.

(a) Internal wiring with single core copper conductor cable/ PVC Insulated Copper Strip of suitable size incoming to bus bar and bus bar to outgoing MCCB/MCB-1Job. (b) Fine wiring with single core copper conductor cable for instruments/indicating lamps-1 Job. The LT panel should have arranagement for fixing of following ACB and MCCB's switches which will be paid and measured under relavent item here-in-after :-

Incoming

(i) Air Circuit Breaker 630 Amp draw out type 4 Pole , 415 Volts, Breaking capacity 50KA - 01 No.

Outgoings

(i) MCCB 320 Amp , 4 Pole , 415 Volts, Breaking capacity 36KA - 01 Nos.

(ii) MCCB 250 Amp , 4 Pole , 415 Volts, Breaking capacity 36KA - 01 Nos.

(iii) MCCB 100 Amp , 4 Pole , 415 Volts, Breaking capacity 25KA - 02 Nos.

(iii) MCCB 63 Amp , 4 Pole , 415 Volts, Breaking capacity 25KA - 02 Nos.

Note for item No- 41.00 - Fixing arrangement diagram and line diagram of the panel shall be got approved by accepting officer before panel fabrication.

S&F in replacement of Air Circuit Breaker 630 Amp, 4 Pole , 415 Volts rating with, overload, short circuit fault protection, thermal magnetic release (Manual drawout type) Breaking capacity 50KA)Ics=100% of Icu- complete all as specified and directed. (Make: Legrand,Cat part No- 0287 30 , or equivalent in L&T/Havells)

S&F in replacement of MCCB 320 Amp, 4 Pole , 415 Volts rating with, overload, short circuit fault protection 3 phase with neutral link specially fixed for incoming supply (Breaking capacity 36KA)Ics =100% of Icu- complete all as specified and directed. (Make: Legrand,Cat part No- 4220 06 , or equivalent in L&T/Havells)

S&F in replacement of MCCB 250 Amp , 4 Pole , 415 Volts rating with, overload, short circuit fault protection 3 phase with neutral link specially fixed out going supply (Breaking capacity 36KA)Ics =100% of Icu complete all as specified and directed (Make: Legrand,Cat part No- 4202 49 , or equivalent in L&T/Havells)

S&F in replacement of MCCB 100 Amp , 4 Pole , 415 Volts rating with, overload, short circuit fault protection 3 phase with neutral link specially fixed out going supply (Breaking capacity 25KA)Ics =100% of Icu complete all as specified and directed. (Make: Legrand,Cat part No-4200 55 , or equivalent in L&T/Havells)

S&F in replacement of MCCB 63 Amp , 4 Pole , 415 Volts rating with, overload, short circuit fault protection 3 phase with neutral link specially fixed out going supply (Breaking capacity 25KA)Ics =100% of Icu complete all as specified and directed. (Make: Legrand,Cat part No-4200 53 , or equivalent in L&T/Havells)

Note:- The contract sum shall be arrived at after deducting amount of schedule of credit from the total quoted amount.

KAMLESH ENTERPRISE

HIRA SINGH

M/S TSHERING BHUTIA