REPAIR/ MAINTENANCE OF TRANSFORMER INCL DEHYDRATION OF TRANSFORMER OIL AND MAINTENANCE OF HT DISTRIBUTION NETWORKS AT NAMKUM, KHOJATOLI AND LPH AREA UNDER GE RANCHI

M & L for Servicing / Calibration to 33 KV HT VCB panel ( Incomer panel) complete including the following : switching off electric supply, Checking of mechanical system for proper functioning, replacing closing buffer, triping buffer (VMX type), V,I connection gap check, motor coil resistance check, closing coil resistance check, spring charging cut off switch check, aux switch check, NO-NC states check, trip coil resistance check, testing details, timing test, oil value test, breaker timing test, connector resistance test, IR value test, HV test, mechanical and electrical mechanism check, counter reading check, shock observer check, pre close/ post close circuit check, test and service position limit switch check, breaker drive screw operation check, trip coil assemble operation check, mechanical latch . Cleaning & servicing the fixed/ moving contact & blowing out dust and applying the proper lubrication/ greasing and reassembling the VCB including connection to HT panel complete including replacement of following spares, Unit rate include preventive maintenance and break down during the entire period of work complete all as specified and as directed.

(a) Control Fuse with link 32 A, - 12 Nos (b) Trip Netural close switch, - 01 No (c) Hooter 30 V DC - 02 No (d) Multifunction energy meter with KHW, KVAH, PF, HZ, KW etc loading - 01 No (e) Indicating LED lamp - 03 No(f) Non- directional IDMT relay (over current,short circuit & Earth fault) Make - C&S/ABB/Crompton/Scheinder electric -01 Nos (g) Master trip relay make -C&S/ABB/Crompton/Scheinder electric -01 No (j) 3 Elemant auxilliary relay set Make - C&S/ABB/Crompton/Scheinder electric-01 No (k) Auxilliary relay for protection transformer Make - C&S/ABB/Crompton/Scheinder electric-01 Nos Note:- (i) Maintenance of all HT VCB will be carried out as per maintenance scheduled (ii) Testing of above job to be carried out by engineers of authourised dealer/service centre.(ii) The Control wiring shall be done by 1.5 Sqmm 8 core control cable upto the length of 100 RM and shall be included in the qouted rates (iii) Panel wiring shall be replaced with 2.5 sq mm copper wire the entire control accessories and shall be included in the qouted rates.(iii) VCB Panel Painting to be done properly with siemens colour and shall be included in the qouted rates.

Supplying, installing, in replacement of 220 Volt AC/ DC Motor 100 to 500 Watt Class B for 33 KV tripping control system complete all as specified and as directed. Make:- AREVA (Modle no ERC-A-AOODC.OO) or Equivalent in Schneider/L&T/C&S complete all as specified and as directed.

Supplying, installing, in replacement of Hooter 90mmX96mm AC 230V for 11 KV CV VCBs complete all as specified and as directed complete all as specified and as directed.

Supply and fixing of Over current & Earth fault Protection numerical relay suitable for existing 11KV ring main unit & feeder protection of any make with Aux supply,CT current,internal battery ,USB port ,cold load pickup circuit bearker protection ,potential free alarm contacts ,last 5 fault and 10 event record with time stamp , LCD display ,USBs Communication etc all as per standard IEC-60255, EN-65000 and IEC-255 and relay having following protection features complete all as directed. Make - C&S/Seimens/ABB/CG (i) Relay having three phase definite time over current and short circuit protection current with varriable times ,three phaes over current protection with short circuit protection with variable tripping times ,define time and inverse time earth over current protection,circuit breaker protection. (ii) protection blocking through DI (iii) three phase time over current protection (iv) Three phase instantaneous protection.(v) earth time over current and earth instantaneous over current (vi) circuit breaker failure detection (vii) trip circuit supervision complete all as specified and as directed.

Repair / servicing and Checking the HT 11KV, Capacity 630 Amps, out door type, Ring main unit (RMU) having upto 04 way breakers ,tripping circuit and resetting trip values and the nuemerical relays and checking tripping machanism servicing the LBS fully , indicator wiring setting of charge spring by engaging well experianced technicians as per manufacturer recommendation and all as directed.Note: Spare parts shall be measured and paid separately under relevant items : complete all as specified and as directed.

Taking down old unsv earthing of any type and size and Supply of Earth electrode 17.2 mm dia 3 mtr long of low carbon steel electrode with copper bonding of thickness 250 micron, Back-fill earthing enhancing compound AXIS ULTRA / AXIFILL type Carbon based compound conductive concrete type which has a resistivity of less than 0.12 Ohm Mtr as per Clause 14.5D of IEEE : 80 standard. Back-fill compound should be electronically conductive (Like in metals) and should not depend on moisture for conduction. Back-fill comound should be environment friendly & should be solidify when mixed with water and set like concrete and should not leach / diffuse into the ground. Back-fill compound shall not be mixed with any soil while pouring in the bore hole. Test Certificate as per as per IEC: 62561-7 for Back-fill compound shall be submitted along with the material including SS clamp to be provode both side and PVC EARTH PIT 300 X 300 MM WITH PLASTIC LID complete all as specified and as directed. Note - (i) Earth electrode should be applicable Standards IS: 3043, IEC 62561-2 & IEC 60364-5 and made of High Tensile steel rods copper bounded, High tensile strength,good electrical conduction & effective performance and suitable for all type of soil and provided minimum distance 3 Mtrs. (ii) Back-fill compound should be Compliance to the Standards IEEE: 80, IS-3043, BS 7430, IEC 62561-7, ANSI/NSF 60 Certification.(iii) Positive low resistance electrical connection to the earth. (iv) Does not contain hazardous chemicals.(v) Electronically conductive (like in metals) and is not dependent on moisture.(vi) Provide the desire value of earth resistance as per required specified values. (vii) Provide the Exothermic welding joints to entire grid system joints of earthing electrod. (viii) Test certificated to be provide of each electrod.

M&L for Copper earth strip of size 32x6 mm in ground not exceeding 40cm deep / fixing to wall / pole structure including taking down old strip complete all as specified and as directed.Note :- (i) Excavation for laying of Earth strip to be paid in respective items (ii) Cost of insulator and other accessories for fixing of earth strip to pole structure to be includes in items rates. complete all as specified and as directed.

M&L for GI earth strip of size 32 x 6 mm in ground not exceeding 40cm deep / fixing to wall / structure including taking down old strip complete all as specified and as directed.Note :- (i) Excavation for laying of Earth strip to be paid in respective items (ii) Cost of insulator and other accessories for fixing of earth strip to pole structure to be includes in items rates complete all as specified and as directed.

Manufacturing, supplying and fixing in repair retro reflective Mandatory/ Regulatory sign boards of 900 mm diametre with support length of3750 mm and made up of 2 mm thick aluminium sheet, face to be fully covered with high intensity encapsulated type heat activated retro reflective sheeting conforming to type - IV of ASTM-D 4956-01 in blue and silver white or other colour combination including subject matter, message (bi-lingual), symbols and borders etc. as per IRC ; 67:2001, pasted on ,substrate by an adhesive backing which shall be activated by applying heat and pressure conforming to class -2 of ASTM-D-4956-01 and fixing the same with suitable sized aluminium alloy rivets @ 20 cm c/c to back support frame of M.S. angle iron of size 25x25x3 mm along with theft resistant measures, mounted and fixed with 2 Nos. M.S. angles of size 35x35x5 mm to a vertical post made up to M.S. Tee section ISMT 50x50x6 mm welded with base plate of size 100x100x5 mm at the bottom end and including making holes in pipes, angles flats, providing & fixing M.S. message plate of required size, steel work to be painted with two or more coats of synthetic enamel paint of required shade and of approved brand & manufacture over priming coat of zinc chromate yellow primer (vertical MS-Tee support to be painted in black and white colours).Backside of aluminium sheet to be painted with two or more coats of epoxy paint over and including appropriate priming coat including all leads and lifts etc. complete all as specified and as directed.

Supply only defective LT porcelain bushings complete of transformer step down out door type 11KV/433 Volts of capacity 63 to 250 KVA any make/ size/ type complete all as specified and as directed.

Supply only defective LT porcelain bushings complete of transformer step down out door type 11KV/433 Volts of capacity 315 to 500 KVA any make/ size/ type complete all as specified and directed.

Supply only defective HT porcelain bushings complete of transformer step down out door type 11KV/433 Volts of capacity 63 to 250 KVA any make/ size/ type complete all as specified and as directed.

Supply only defective HT porcelain bushings complete of transformer step down out door type 11KV/433 Volts of capacity 315 to 500 KVA any make/ size/ type complete all as specified and directed.

Supply only defective LT bushing rod made out of gun metal with threading & of suitable length/ size all as per existing including metal rings/ bolts/ washers/ rubber rings etc of transformer step down out door type 11KV/433 Volts of capacity 63 to 250 KVA any make/ size/ type complete all as specified and as directed.

Supply only defective LT bushing rod made out of gun metal with threading & of suitable length/ size all as per existing including metal rings/ bolts/ washers/ rubber rings etc of transformer step down out door type 11KV/433 Volts of capacity 315 to 500 KVA any make/ size/ type complete all as specified and as directed.

Supply only defective HT bushing rod made out of gun metal with threading & of suitable length/ size all as per existing including metal rings/ bolts/ washers/ rubber rings etc of transformer step down out door type 11KV/433 Volts of capacity 63 to 250 KVA any make/ size/ type complete all as specified and as directed.

Supply only defective HT bushing rod made out of gun metal with threading & of suitable length/ size all as per existing including metal rings/ bolts/ washers/ rubber rings etc of transformer step down out door type 11KV/433 Volts of capacity 315 to 500 KVA any make/ size/ type complete all as specified and as directed.

Supply only defective silica gel breather assembly for HT distribution transformers of 63 KVA to 500 KVA capacity complete all as specified and as directed.

Supply only defective gun metal drain valves of transformers from 63 KVA to 250 KVA capacities complete all as specified and as directed.

Supply only defective gun metal drain valves of transformers from 315 KVA to 500 KVA capacities including dismantling old one complete all as specified and as directed.

Supply only defective (OTI) Oil Temperature indicator from 100 to 500 KVA capacity distribution existing transformers including dismantling old one complete all as specified and as directed.

All as per items No- 10 but after removing transformer to authourized HT electrical workshop by lorry transport for inspection and rewinding ,replacement of defective parts ,rewinding of HT/LT coils as found necessary and refilling of oil after dehudification /filteration,testing and submission of test reports after repairs /overhauling and reinstallation of the transformers in original location with complete incoming /out going cable connections etc (cost of replacing defective parts and rewinding with copper enameled conductor of appropriate grade will be measured and paid separately ) Note - Rates includes provision of mobile crane unit for lifting /loading of the transfromer at site & workshops) (i) Any damage to insulators/ bushes/ windings etc. while in the custody of the contractor shall be made good at no extra cost to govt. The serviceability of the transformer shall be checked and confirmed by the contractor before taking into his custody.(ii) Rewinding/ re-insulation of HT/ LT (primary/ secondary) coils, bushes, studs, Transformer oil,cable box, replacement of buchholtz relay if any etc will be measured and paid separately in respective items. complete all as specified and as directed.

Supply and replace defective terminations/ connections inside the transformer complete all as specified and as directed.

M& L for Rewinding of HT/LT coils with copper wire / strips DPC / super enameled copper winding wire match with existing gauge or as recommended by the manufacturer for turn ratio and impedance including requisite paper / insulation material in Each layer of winding complete all as specified and as directed.

Filtration of transformer oil of transformers installed at various locations to achieve di-electric strength not less than 60 KV for 1 minute at 2.5 mm gap as per relevant IS with portable filtration plant, testing of the oil for the di-electric strength before filtration and after filtration complete all as directed. Note :- a) The rate quoted shall be deemed to include for taking necessary conections to filteration plant from transformer and switch gear oil duly removing the inlet and out let connections. (b) Electric supply for the filteration plant will be made self arrangement by the contractor and cost deemed to be including qouted rates. (c) The dielectric strength value of the transformer oil shall be tested affter filtration as specified and directed.(d) Test reports shall be enclosed at the time of payment. complete all as specified and as directed.

Supplying, filling dehydration of new transformer oil for toping up/replacement of transformer oil having dielectric strength not less than 60 KV (rms) with gap of 2.5 mm all as conforming to IS 335 of 1993 complete all as specified and as directed.

Supply and fix HT 33 KV outdoor non-linear type lightening arrestor 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 alkathine pipe with all fittings connected to earth stripwith nut, bolt, washer transmission class having discharge capacity of 65 kilo Amps and suitable for working pressure complete all as specified and as directed.

S&F in replacement of unserviceable lightning arrestors with new 11 KV Lightning arrestors explusion type complete with all fittings and necessary connection,transmission class, discharge capacity 65 kilo amps complete all as specified and as directed.

Dismantling transformer step down out door type 11KV/433 Volts of capacity 100 to 500 KVA by disconnecting incoming /outgoing cables and ACSR jumpers, opening top end of thed unit by unscewing nuts/bolts washers and shifting to other location and reconnected the same as above , make funtional testing complete all as directed .Note :- Labour charge and provision of mobile crane unit for lifting /loading of the transfromer at one site to other site will be includes in items qouted rate complete all as specified and as directed.

Supply, lay, test and commissioning of XLPE insulated screened PVC bedded, galvanised steel strip or wire, armoured, heavy duty electric power cable (HTUG), 11000 volts grade with stranded aluminium conductor of size 3 core 95 Sqmm ( Earthed) including takingout existing unserviceable cable complete all as specified and as directed. Note - Rates are included with Megger testing of Cable.

Material and labour for cable jointing kit for 11KV (Earthed) grade cable for outdoor end termination heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 95 Sqmm and testing after jointing including taking out unserviceable joint kit complete all as specified and as directed.

Material and labour for cable jointing kit for 11KV (Earthed) grade cable for indoor end termination heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 95 Sqmm and testing after jointing including taking out unserviceable joint kit complete all as specified and as directed.

Material and labour for silica gel in dark blue colour for transfromer breather complete all as directed.Note - Taking down and refixing of breather assembley for refilling of Silica gel shall be included in qouted rates. complete all as specified and as directed.

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