Repair and Maint of VCB, HT Panels Transformer and connected E/M work Under GE (AF) Adm Area

Amount

Disconnecting and taking out existing unserviceable current transformer of any description and in any position and Supply, installation, commissioning and testing of cast resin type 11 KV current transformer having ratio of 100+50/5 A having protection core class 5P10, burden of 15 VA and metering core class 1.0 and burden of 15 VA breaking cap of 21.1 KV for 1.0 second all as specified and directed. (Make:- AE/Siemens/Kappa/PACTIL/CG)

All as per item no. 01 here in before but of ratio 50-25/5 A complete all as specified and directed

All as per item no. 01 here in before but of ratio 200-100/5+5A complete all as specified and directed

Filtration/dehydration of transformer oil in transformer 11/.433 KV. The machine continuously run round the clock till obtaining die electric strength not less than 55 KV in 2.5mm gap and toping up with new Transformer oil and carrying out IR test of primary and secondary transformer all as specified and directed. Note : New Transformer oil will be paid and measured separately under respective item of Sch ‘A’.

Supply, heating and topping up transformer insulating oil EHV grade having dielectric strength not less than 60 KV (R.M.S) at 2.5 mm gap high viscosity confirming to IS – 335 of 1983 complete for renewal of unserviceable transformer oil or for toping up all as directed. Make:- Trans oil/Power oil/Bharat Petroleum/Savita

Taking down carefully the 11KV/.433 KV transformer from plateform, draining out the transformer oil in clean barrels, opening the top cover of transformer of capacity 200 KVA to 500 KVA, disconnecting the internal electrical connection, taking out the core/winding coils out of the tank taking out the defective/burnout HT/LT coils, cleaning the tank and getting out the dust particles, refitting the core in the tank after necessary repairs and heat treatment, connecting all the electrical connections, refitting the top cover and other accessories and making the transformer absolute leak proof, pouring in the transformer oil in the transformer including hoisting placing in position and securing properly on 4pole/ 2 pole structure, platform at site and making all HT/LT connections & testing on full load all as specified and directed by Engineer-in-Charge. Notes:- (i) Cost of glass sleeves/ebonite sleeves , minor spares like gear etc if renewed, shall deemed to be included in unit rate and nothing extra shall be paid on this account. (ii) New transformer oil for renewal of old unserviceable transformer oil , shall be measure and paid seperately under appropriate item of sch "A"

Disconnecting & taking out non functional VCB of any description and any make of rating 11 KV, dismantling / opening of the VCB for servicing / overhauling, taking out and removing unserviceable/defective parts including cleaning & servicing ,greasing, oiling of the parts etc and renewal of unserviceable parts with new one, reassembling the VCB after overhauling / servicing and its testing complete all as specified and directed by Engineer-in-Charge. Notes :- (i) The quoted rates by the contractor includes for fixing the serviceable parts in position and renewal of unserviceable parts with new parts. The new renewed parts shall be measured and paid for separately under appropriate item of Sch `A’ as `supply only '

Supply only following spare parts for 11 KV VCB, 400/630 Amps capacity of Make: Crompton Greaves, conforming to the respective cat part given as under :- (Note :(i) Fixing & testing element of following item is deemed to be included under Sch `A’ item No 07 above. (ii) Quantity of under mentioned items is tentative and contractor shall have no claim on account of variation of qtys or non execution of any of the item

(a) Vaccum intrupter type VL-35409 C2 or as per sample.

(b) Isolating contact assembly 400/630 amps.

(c) Upper connector 400/630 amps.

(d) Lower connector 400/630 amps.

(e) Fixed contact block 400/630 amps.

(f) Moving contact block 400/630 amps.

(g) Set of 6 Nos flexible connectors 400/630 amps.

(h) Upper supports.

(j) Lower supports.

(k) Support insulator.

(l) Bridge rectifier.

(m) Motor cut off limit switch.

(n) Auxilary switch (7 NO + 7 NC ).

(o) Closing coil assembly 30 volts DC.

(p) Tripping coil assembly 30 volts DC.

(q) Big gear assembly

(r) Closing spring assembly

(s) Tripping spring

(t) Ratchet handle for manual charging of VCB

(u) Space Heater 230 V AC

(v) Motor and gear assembly 110 V AC/DC VMG -14 type

Disconnecting and taking out existing unserviceable indicator lamps with holder of any description and in any position and Supply & fixing LED type indicating lamp suitable for 30 Volt DC /110 Volt AC/230 volts AC supply complete all as specified and directed.

Disconnection and taking out of unserviceable supervision relay any type from existing HT VCB panel in any position and supplying, installation, commissioning & testing of electronic type Product cod trip supervision relay 24 V to 110 V DC. Make:- Cromption Model No. TH 30

S&F Digital type Volt meter 0-15KV, PT operated 110 Volt input complete all as specified and directed. Make:- AE/Nippen

AS&F Digital type Ammeter CT operated, 5 Amp input complete all as specified and directed. Make:- AE/Nippen

M & L in renewal of wiring of IDMT relay/CT/trip relay complete with 2.5 sqmm copper flexible conductor cable including their numbering and make system serviceable complete testing of IDMT relay complete all as specified and directed.

Checking tripping of circuit breaker through IDMT over current and earth fault relays at plug setting intended in service by primary current injection in CT to ensure proper function of relays trip coil control circuit etc during fault condition including testing of over current and eath fault IDMT relays as per time characteristics by secondary injection test O/C 50% , 75%, 200% & E/F 20-80% plug setting and operating time twice the set value and TMS 1 including well cleaning and de-carbonizing of relay contacts .

M&L painting with two coats of smoke grey paint on VCB panel after cleaning dust, dirt and oil including writing the SM/MES No on VCB with block letter in white paint all as directed.

Taking down carefully the 11KV/.433 KV transformer from plateform / four pole structure, draining out the transformer oil in clean barrels, opening the top cover of transformer of capacity 200 to 500 KVA, disconnecting the internal electrical connection, taking out the core/winding coils out of the tank taking out the defective/burnout HT/LT coils, cleaning the tank and getting out the dust particles, refitting the core in the tank after necessary repairs and heat treatment, connecting all the electrical connections, refitting the top cover and other accessories and making the transformer absolute leak proof, pouring in the transformer oil in the transformer including hoisting placing in position and securing properly on 4pole/ 2 pole structure, platform at site and making all HT/LT connections & testing on full load all as specified and directed by Engineer-in-Charge. (i) Cost of glass sleeves/ebonite sleeves if renewed, shall deemed to be included in unit rate and nothing extra shall be paid on this account. (ii) Rewinding/new winding of HT/LT coils new cork sheet, top cover gasket, new bushings shall be measured and paid for separately under appropriate item of Schedule `A'. (iii) New transformer oil for renewal of old unserviceable transformer oil, shall be measure and paid separately under appropriate item of schedule 'A'. (iv) Rewinding of HT/LT coils will be carried out at approved workshop.

Material and labour for rewinding of HT/LT coils with supper enameled copper winding wire of appropriate gauge along with allied materials suitable for transformer of capacity upto 750 KVA complete all as directed by Engineer-in-Charge.

M&L for disconnection of incoming HT Cable and out going LT Cable/Bus bar connection from the transformer of capacity 100 to 250 KVA with proper shut down and opening the top cover by using suitable lifting arrangement and drain out the transformer oil to a required level and lifiting the core assembly with suitable lifting arrangement for minor repair of core/winding or HT/LT studs including renewal of gasket or any other minor parts and re-assembling the complete transformer and testing after completion of works (Rates quoted by Contractor shall be deemed to included the renewal of minor defective parts)

All as per item No. 19 here-in-above but the capacity of transformer is 315 to 500 KVA

Supply and fixing in renewal and testing externally operated tap changer switch “OFF LOAD TYPE” on HV winding to vary the LV Voltage up to +/- 7.5% variation limit in steps of 2.5% complete complete all as specified and directed by Engineer-in-Charge.

renewal of HT bushing made of brass any size type including metal part and brass nut bolts and washers of any type for transformer of capacity following sizes including opening of top cover of transformer decaning of oil upto required level of following capacity:- (a) 50 to 160 KVA Transformer

(b) 200 to 500 KVA transformer

(c) 600 to 750 KVA transformer

renewal of LT Rod/Neutral rod or studs made of brass with brass nuts & washers fitting etc as per size & shape of original including opening cover of transformer decaining of oil upto required level. Re-fixing and reconnecting the same after stud has been renewed of following capacity :- (a) 50 to 160 KVA Transformer

(b) 200 to 500 KVA transforme

(c) 600 to 750 KVA transformer

renewal of set of gasket complete for transformer of following capacity :- (a) 50 o 160 KVA Transfomer

(b) 200 to 500 KVA transformer.

(C ) 600 to 750 KVA transformer.

Supply and renewal of fresh silica Gel.

renewal of air breather assembly any type complete with filled silica Gel as per sample.

renewal of dial type thermometer as per sample

M&L for renewal of air release plug of transformer complete all as specified and directed.

renewal of oil level indicator glass as per original size

Material and labour for disconecting HT/LT connections complete and shifting of transformer 11/0.433 KV of capacity upto 250 KVA using man power/crane/transport vehicle to required location at AF Stn including installation at new location,commissioning and testing incl making all HT/LT connections, to restore the electric supply complete all as directed by Engineer-in-Charge.

Material and labour for disconecting HT/LT connections complete and shifting of transformer 11/0.433 KV of capacity exceeding 250 KVA to 500 KVA, using man power/crane/transport vehicle to required location at AF Stn including installation at new location,commissioning and testing incl making all HT/LT connections, to restore the electric supply complete all as directed by Engineer-in-Charge.

Shifting of transformer 11/0.433 KV of capacity 500 KVA trolly mounted from the Main Power House to required location in the AF Stn campus, using man power/transport vehicle including installation at new location,commissioning and testing incl making all HT/LT connections and disconnection of all HT /LT connections of faulty transformer of any capacity, and restore the electric supply to the effected area complete all as directed by Engineer-in-Charge.

M&L for spray painting of Indoor / outdoor Transformer of any capacity with one coat of grey paint after rubbing/scratching of old paints and marking of SM No. / MES NO./ Cap of transfarmer etc. all as specified and directed.

S&F in renewal of PT of suitable for 33 KV of existing sample in Main Receiving No-2 complete all as specified and directed. Make; Laxmi / Jyoti

Removing and Refixing of Power transformer 33/11 KV of capacity 3.15 MVA of weight of 9500 kg (9.5 Ton) from the Main Receiving Station 1, disconnecting carefully 33 KV and 11 KV side connections, Earthing connections and lifted through crain of suitable capacity and moved to safe place of MRS 1, after completion of foundation work, refixing the same transformer at same place including conecting 33 KV, 11KV and earthing connections properly complete including testing of transformer all as specified and directed by Engineer-in-Charge. Note: This shifting work of transformer, any physically damages found the transformer, contractor shall be resposible for the repair of damage work other wise the cost of repair work is recovered from the contractor in this Contract Agreement. (2) The rate of labour, crain and T&P etc complete include the quoted rate.

GUPTA ENGINEERING WORKS