SPECIAL REPAIR TO 4 MVA POWER TRANSFORMER AT OLD AMRITSAR CANTT

Amount

Taking down defective transformer 4 MVA, 66/11 KV capacity (approx weight 16 ton ) from the platform after disconnecting from the 66 KV and 11 KV HT connections and removing from power house with the help of suitable T & P. At workshop, Opening of top cover of the transformer by opening of nut bolts etc and lifting of core assembly to examine the damaging of winding all as specified and directed by Engineer-in-Charge. Note:- i) BOO will be detailed by the Accepting Officer for pre examination of the transformer and weighing of each coils of three limbs of copper wound tansformer and measuring size and type of the copper wire/winding and quantity of transformer oil completely all as specified and directed. ii) Safe lifting of transformer and safety of the persons which are involving in this job i.e. from 66 KV yard and transport the 4 MVA transformer from power house to reputed repair workshop is the responsibility of the Contractor. iii) During the transportation, Contractor will be solely responsible for safe carrying of this transformer without any damaging to the body of power transformer and connected accessories etc by using suitable heavy vehicle via National highway and after reaching the workshop, including safely unloading of power transformer in the workshop. iv) Nothing extra on acoount of damage to the transformer will be given to the Contractor and damages if any takes place will be made good by the Contractor at his own cost.

Material and labour for cutting and removing the old burnt winding from all the three limbs, and replacement of primary winding (HV side suitable for 66 KV) and secondary winding (LV side suitable for 11 KV) with new copper wound coils by using super enamelled superior quality copper wire confirming to IS of size as recomended by the manufacturer of transformer suitable for 4 MVA power transformer with necessary core and paper insulation, including varnishing etc complete all as specified and directed. Note: i) BOO will visit the workshop during the rewinding for checking of copper wire used for rewinding and weighing of each coil and checking of quality of insulation paper used. Make for copper wire :- Hindalco, Hindustan copper ltd or equivalent makes as specified in Appx'B' list of makes.

Supply and filling of suitable transformer oil with di electric strength 60 KV conforming to ISI-335/ 1993 in replacement of old used oil for 4 MVA transformer, suitable for 66/ 11 KV system complete all as specified and as directed.

Supply and fixing high tension (HT) insulation material superior quality for separating the HV to LV, LV to core winding of transformer coils for all the phases, set of three including removing the old one complete all as specified and as directed.

Supply and fixing brazing material for brazing and fabrication of associated work for connection of wires of 4 MVA transformer capacity, 66/ 11 KV, including gasket sets and other miscellaneous items complete in all respect all as specified and as directed.

Material and labour for drying of transformer body from inside including conservator to remove foreign particles and re-assembling transformer 4 MVA capacity after rewinding of coils, pouring of transformer oils including any type of repairs such as T & P, equipments for testing of transformer, servicing of on load tap changer, cleaning of core/ any type of repair to core assembly, main tank & conservator tank, consumable items required during installation of transformer, testing of earthings, servicing & testing of buchhalz relay, servicing of bushing, CTs, WTI & OTI and to make transformer in serviceable condition complete in all respect and making transformer ready for testing of 66/ 11 KV in the presence of BOO to checking all the testing parameters as per IS -2026 in workshop completely shall be deemed to be included in unit quoted rate complete all as specified and as directed by Engr-In-Charge.

Material and labour for transportation of 4 MVA transformer from workshop to 66 KV Substation Amritsar at the location specified by GE ASR. During the transportation, Contarctor will be solely responsible for safe bringing back of this transformer without any damaging to the body of power transformer etc by using suitable heavy vehicle via National highway and after reaching the MES Power House safely unloading on the platform of 66 KV Substation complete all as specified and directed by Engineer- in-Charge. NOTE :- (i)As per IS 2026 all the routine test has to be carried out at Power House by State Electricity Board Protection Department (i.e. PSPCL) and commssioning of transformer by the SEI. All the charges for testing of parameters from state electricity board and commissioning by SEI in pressence of engineer from same workshop during this testing and commissioning deemed to be included in the quoated rates all as specified. (ii) During transportation accidental insurance shall be deemed to be covered from MES POWER HOUSE to WORKSHOP and Vice versa and cost of the same shall be deemd to be included in quoted rate by the contractor. Nothing extra shall be paid to the contractor (iii) completion of work will be issued after testing of transformer in presence of SEI and commissioing of the transformer.

M&L for inspection, overhauling incl repairing required if any and testing and commissioning of outdoor type, 66 KV SF-6 breaker including charging with approved gas if required at 66 KV Grid Sub station complete all as specified and directed by Engr in charge.

M&L for inspecting repairing testing and commissioning of all C&R panel relays complete all as specified and directed by Engr -in-charge including the following : (a) IDMT RELAY (b) Master Trip Relay (c) Differential Relay (d) all other miscellaneous relay including checking of all wiring circuit. Note: Tripping Mechanism as per transformer protection requirement shall be got done from Power Grid corporation /PSPCL before energizing the transformer, The charges for PSPCL for testing of the entire system for testing will be borne by the Contractor and rate quoted shall be deemed to included the same in unit quoted rates.

M&L for inspecting ,repairing, testing and commissioning of OLTC indoor panel as per transformer protection requirement and testing of the same shall be got done from Power Grid corporation /PSPCL before energizing the transformer, The charges for PSPCL for testing of the entire system for testing will be borne by the Contractor and rate quoted shall be deemed to included the same in the unit quoted rates.

M & L for repairing/servicing of 66 KV outdoor type isolators installed at 66 KV switch yard including minor repair of parts,oiling greassing, gas charging etc complete all as specified and directed.

Supplying , laying, jointing & testing 2.5 Sqmm 2 core PVC insulated armoured electric cable with flexible stranded copper conductor 1100 volts grade complete including taking down old unserviceable cable any type and size all as specified and directed.

Supplying , laying, jointing & testing 2.5 Sqmm 4 core PVC insulated armoured electric cable with flexible stranded copper conductor 1100 volts grade complete including taking down old unserviceable cable any type and size all as specified and directed.

Supplying , laying, jointing & testing 2.5 Sqmm 10 core PVC insulated armoured electric cable with flexible stranded copper conductor 1100 volts grade complete including taking down old unserviceable cable any type and size all as specified and directed.

Supply, laying, testing & commissioning of HT 11 KV (Earthed) XLPE insulated screened PVC bedded, electric power cable (heavy duty) with aluminium conductor 11000 volts grade,circular screened with extruded semi conducting compound in combination with copper tape , inner sheath of PVC tape galvanized steel strip flat , around and overall PVC sheathed, armoured conforming to IS 7098 Part II, 1985 amended upto date, of size 3 core 240 Sqmm, ISI marked, laid in trenches or passing through pipes/ducts including taking down old cable of any size all as specified and as directed. Make : Polycab/Glostar/Incab as approved by GE.

Supply and fixing in replacement of lightening / surge arrestor suitable for HT 66KV out door with mountings accessories complete fixed on cross arms of two pole structure / GI flat strip and connect with same size of ACSR conductor encased in PVC alkaline pipe with all fittings connected to earth strip with nuts, bolts and washers, maximum, continuous operating voltage 66 KV, COV (KV RMS), 25.5, type Zodiver, styple ZSP. Make : Areva or equivalent including taking down old lightenging arrestor complete all as specified and as directed including dismantling existing one.

Supply and fix breather transparent made of high quality PVC complete with first fill silica gel all as required for 4 MVA power transformer of 66/11 KV system complete all as specied and as directed.

M & L for earthing complete with galvanised earth plate electrode 600mm X 600mm X 6 mm thick buried directly in ground (earth pit not less than 2.25 m below ground level) with top edge of earth plate not less than 1.5 m below normal ground level, connected to galvanised earth lead GI strip 40x6 mm by means of nuts, bolts, check nuts & washers of galvanised iron or steel all as shown on electrical plate No. 3 of MES schedule 2009, Part – I (Specifications) and connected to main switch board / main DB’s / earthing test point including all necessary excavation and earth work in any type of soil, adequate quantity of charcoal dust & common salt all around the earth plate minimum 150 mm in all directions with & including watering pipe 20 mm dia GI medium grade, GI funnel made out of 0.63 mm thick GI sheet, wire gauge, 50 mm thick RCC cover in PCC 1:2:4, type B-1, duly reinforced with 6 mm dia mild steel round bars @ 150 mm both ways center to center with suitable lifting handle to cover, earth pit of PCC 1:3:6 type C-1, GI protection pipe light grade 40 mm bore up to 7.5 m length from earth electrode & engraving of earth marking on nearby building with CM 1:4 plate size 200mm X 150mm X 15 mm & painting of earth result etc. including testing on complete all as specified and directed.

Supply and fix in replacement Earth fault and over current relay make Schneider model :P127 BA OZ 112FB1 complete all as specified and directed.

Supply and fix HT 11 KV bushing of transformer of 4 MVA capacity 66/11 KV complete all as specified and directed by Engr-In-Charge.

Note- i) In case of failure of repaired transformer for any reasons the Contractor will make arrangement for spare transformer of the same capacity till the defects of the failed transformer is rectified and reinstalled at site. Nothing extra on this account will be paid to the Contractor. ii) The testing charges to be paid to PSPCL before energizing the transformer is deemed to be included in the quoted rates. iii) The contractor shall check all protections of transformer and repair / replace the items such as relays wiring etc, if required for safe and smooth functioning of transformer before emergency of trnasformer. Rate quoted shall be deemed to be included in the item rate quoted above. iv) The repairs to the transformer will be carried out by the contractor in a factory having facility and experience in repairs to the power transformer of capacity 4.0 MVA and above. v) The transformer will be repaired by the contractor in a factory having all testing facilites for testing of power transformers of capacity 4.00 MVA and more as per IS-2026.

GAGAN TRANSMISSIONS PVT LTD

Shree Balaji Construction

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