PROVN OF TRANSFORMER WITH ASSOCIATED INFRA AT LIVING OUT AREA AT AF STN MOHANBARI

Supply, install, testing & commissioning, of Transformer, Outdoor type,Copper wound,ONAN cooled transformer of capacity 400 KVA complete with standard fitting HT 11 KV,3 Phase ,LT 433 Volts, phase 4 wire (Dyn11) with off load tap changer with range -10% to +5% in steps of 2.5% on HT side to vary secondary voltage all as per IS 1180 Level-II complete all as specified and directed. (a) Technical details:- (i) No load voltage ratio(Normal Tap)-11000/433V (ii) No. of Phases-03. (iii) Frequency-50 Hz (iv) Type of cooling- ONAN (v) Winding connection- The primary winding(HV) shall be connected in Delta and secondary winding(LV) shall be connected in star. (vi) Vector group- Windings shall be connected as per vector symbol:Dyn11 (vii) Neutral Earthing- The neutral point of secondary(LV) winding shall be brought out to a seperate insulated terminal and shall be solidly earthed. (viii) off load Tap changer of the Transformer - Voltage tapping range on HV side will be (-10%) to(+5%) in steps of 2.5%. The tap changing switch shall be located in a convenient positions so that it can be operated from ground level.The switch handle shall be provided with a locking arrangement along with tap position. (ix) The percentage impedance at 75 deg C & 50 Hz refer to the (normal) Pricipal Tapping shall be as per BIS BEE rating. (x) Losses- Minimum losses as per BIS BEE rating.

(b) Structural Details:- The transformer shall be comprising of the following items:- (i) Externally hand operated Off -circuit tap changerswitch with position indicator and locking device. (ii) Conservator with Oil gauge,Filling hole with plug and drain hole with plug. (iii) Undercarriage with four plain rollers. (iv) oil filling hole cum air release plug. (v) Drain valve cum sampling valve. (vi) Filter valve with plug. (vii) Lifting lugs for Transformer. (viii) Lifting lugs for Lid. (ix) Earhing terminals. (x) dehydration breathing device which would not permit ingress of moisture, rain water and insects. (xi) First filling of new dehydrated transformer oil upto recommended level. (xii) rating and terminal amrking plates. Note:- All foundation works for Transformer as per manufacturer Recommendation or as direction by engineer-in-charge for the installation of transformer shall be deemed to be included in the quoted rates.

Supplying , installation, testing and commissioning of RMU 3 way HT 11 KV indoor type,21 KA for 1 sec, rated voltage-12KV, operation voltage-11 KV, rated lightning withstand voltage - 95 KV, rated frequency - 50Hz, 630 amp copper busbar SF6 insulated non extensible compact switch gear consisting of two nos fixed motorised load break switch (LBS) and one nos fixed motorised Vaccum circuit breaker (VCB) in SF-6 gas pressure designed for minimum 1.4 Bar & insulated, welded, stainless steel enclosed with minimum 2.5 mm thickness totally enclosed Ring Main Unit IP-67 protection with self powered microprocessor based complete numerical over current & earth fault relay comprising of the following specification/equipment :- Note :- Contractor shall supply outdoor RMU with out door enclosure. (a) The circuit breaker and earthing switch shall be lockable in the open or closed position by suitable number of padlocks of suitable size (b) Inter panel barrier to prevent arc propagation fron one panel/compartment to other. (c) Earthing switch rated for full making capacity with provision for safe & reliable position indicator. (d) Isolating plug (e) Vaccum circuit breaker unit insulated in SF6 media shall comprising the following : (i) Assembly of VCB interrupter complete with epoxy supprt insulator and self alligning isolating contacts with rating 11KV 630 amps ,21 KA for 3sec , 50 Hz. (ii) Manual charged and manual operated independent closing / triping, trip free operating mechanism and breaker closed/open, spring charge/discharge indication. (iii) Mechanical operation counter-02No (iv) One bus bar chamber including a set of 3 phase 630 amps copper bus bar. (v) Strip heater 230 volts AC single phase 80 watt. (vi) Current transformer chamber comprising of 3 nos single phase resin cst CT's of 100-50/5 and accuracy class 1.0 for metering and class 5P10 for protection in all outgoing VCB feeder - set of 3 (f) One no potential transformer(PT) three phase, dry type ( resin cast) draw out type 11kv/110 volts, 100VA burden, accuarcy class 1.0 with HT & LT HRC fuses for primary and secondary complete as per IS-3156- 01 No.

(g) SCADA Self powered solid state numerical O/C & E/F relay for complete protection of HT,11KV,three phase feeder having facility to record fault current with date & time with suitable communication port as approved by GE- 01 nos (h) Arc flash supervision of circuit breaker,cable and busbar compartment. (i) Digital SCADA compatible intelligent panel meter indicating line/phase current, line/phase voltage, power factor, KVAR,KVA, frequency etc with accuracy class 1.0 for all outgoing feeders. (j) One set of indication lamp(LED) type for ON/OFF indication in all LBS/VCB. (k) One set of indication lamp (LED) type for spring charging and three nos indication lamp for RYB phase indication in all LBS/VCB. NOTE:- (i) All foundation works for RMU as per manufacturer recommendation for the installation shall be deemed to be included in the quoted rates. (ii) Contractor shall submit detailed drawings with specification of the RMU and get necessary approval before placing final order to the manufacturer. (iii) All outgoing / incoming existing HT cable of any size drawing / digging out cable from loops in trenches inclusive of necessary excavation and earthwork as required and relaying the cables shall be deemed to be included in the quoted rates. (iv) Any item missed out above but is technically required for safe and proper operation of equipment shall be deemed to be included in the quoted rate. (v) The material will be purchased only through manufacturing company. Make : ABB/Schenider/Simens/Crompton Greaves/Areva.

Supply, fabrication, installation, testing and commisioning of LT 3 Phase 4 wire 450 Volts system, factory made,CPRI Appoved, water and vermin proof protection pedestal type feeder pilar box of suitable size of out door type made out of 3.15 mm thick CRCA sheet with frame and legs of mild steel angle iron of size 40 x 40 x 6 mm in all side with double door, front and back side openable hinged door and air ventilation arrangement . Danger notice plate shall be fixed on back/ main door. The pannel shall be Complete painted with Powder Coated paint of approved shade. All interconnection between the main bus bar as well as out going feeders shall be carried out with TPN copper bus bar of rating not less than 1.5 times the rated capacity of individual out going feeders and should be insulated with heat shreank cable PVC shleaves and shall be mounted on suitable size "F" class insulators. The degree of protection of outer shell of the panel shall be IP-65. A detachable pre drilled gland plate should be used at bottom. All control wire shal be with 2.5 sqmm multi stranded copper conductors and shall be properly brunched, tied, ferruled for proper identification and print with adequate size of lugs complete with and including PCC (1:3:6) type C-2 of size 0.80 m x 0.60 m x 1.05 m depth (45 cm below ground level and 60 cm above ground level) as in foundation complete including necessaqry excavation, earth work and including connecting all incoming and outgoing LT UG cables complete all as specified and as directed along with and including comprising of the following accessories : - Note : (i) Cost of earth work and PCC are deemed to be inclusive in this item (ii) the schematic diagram of LT pannels shall be approved by GE before procurement.

Incoming:- (i) ACB 4 pole 415 volt 50 Hz of breaking capacity 50KA, 630 Amps, Microprocessor release overload and short circuit protection with double insulation and positive insulation feature - 01 No . (ii) Voltmeter digital type (0-500 volt) - 1 No. (iii) Ammeter digital type with CT (0-1000 Amps) - 01 No. (iv) LED Indicator lamp (R-Y-B)-01 Set of three. Outgoing:- (i) MCCB 4 pole, 415 volts, 36 KA breaking capacity adjustable thermal magnetic release with Ics=100% Icu, neutral adjustment 100% of rating 250 amps including all fixing accessories with both ends spreader links - 2 Nos.(1 stand by) (ii) MCCB 4 pole, 415 volts, 36 KA breaking capacity adjustable thermal magnetic release with Ics=100% Icu, neutral adjustment 100% of rating 200 amps including all fixing accessories with both ends spreader links - 2 Nos. (iii) MCCB 4 pole, 415 volts, 36 KA breaking capacity adjustable thermal magnetic release with Ics=100% Icu, neutral adjustment 100% of rating 160 amps including all fixing accessories with both ends spreader links.- 1 Nos (iv) MCCB 4 pole, 415 volts, 36 KA breaking capacity adjustable thermal magnetic release with Ics=100% Icu, neutral adjustment 100% of rating 100 amps including all fixing accessories with both ends spreader links.-1 Nos (v) MCCB 4 pole, 415 volts, 25 KA breaking capacity adjustable thermal magnetic release with Ics=100% Icu, neutral adjustment 100% of rating 63 amps including all fixing accessories with both ends spreader links - 2 Nos. (vii) Iron danger notice plate of 1.60 mm thick mild steel sheet of size 200 mm X 150mm , white with letters , figures and conventional skull and bones in signal red and fixed with nuts and bolts on door / shutter of FPB for LT -02 No.

Excavation in trenches n.exc 1.50 mtr wide and n.exc 1.50 mtr deep for taking out/ laying of under ground cable, pole, pipe, stay and getting out in soft soil strata including making good to the disbturbed surfaces such as hardstanding, footpath/ pavments complete all as specified and directed.

Returning filling in including spreading leveling watering and well ramming in layers not exceeding 25cm spread any type of soil complete all as specified and directed.

Removing excavated materials n.exc 50 mtr and depositing where directed at a level n.exc 1.50 mtr above the starting point complete all as specified and directed.

M&L for fine sand cushioning to under ground cable provided with a layer of sand 8 cm depth before laying of cable and 15 cm depth after laying and stretching the cable or spreading on surface for switch yard complete all as specified and directed. Note: (i) Punned thickness of sand shall be measured & paid. (ii) Fine sand, free from any type of seeds, vegetation, grass etc shall be laid in switch yard and rate for making sand neat and clean is deemed to be included in the item quoted rate.