PROVN OF STANDBY 500KVA TRANSFORMER PHASE SEQUENCE CORRECTOR AND CAPACITOR BANKS AT 151 BASE HOSP UNDER GE GUWAHATI

Amount

Supply,install,testing and commissioning AC 3 phase 50 cycle 500 KVA Transformer copper wound stepdown plinth mounted ,outdoor type 11000/433 volts at No load ,oil immersed naturally cooled with externally cooling tubes core type delta connected on primary (HV side and star connected on secondary (LV side) in accordance with vector symbol DY-11 (vector group 4) with natural brought on secondary LV side and having tapping at +/-2.5%,+/-5%,+/- 7.5% Level- 3, to be changed by means of hand operated "OFF LOAD" tap changer. when meassured by the resistance meathod after continous full load run in ambient temperature 48 degree centigrade .The transformer shall be complete with standard fittings all as specified and confirming to IS:335 of 1983 for oil and IS: 2026 for transformer comprising of following:- (a)One cable box on LV side (secondary side) consisting of 04 nos of porcelain bushing with bushing rods complete with nut, washers, cable gland etc. (b) Oil conservator tank with filter type drain valve and oil level guage. (c) Dehydration breather assy with first fill of dehydrating agent . (d) Explosion vent. (e) Thermometer pocket on tank cover. (f) Dial type thermometer vapour pressure having range 0-120 degree C with max reading pointer max temp indicator and resetting device. (g) Rating plate with terminal marking. (h) 02 earthing terminal on tank and cover for fixing earth strip of size 32x6mm. (i) Oil level gauge and oil drain filter valve. (j) Lifting hook (k) Oil filler hole with cap /plug with connection complete. (l) Air relief valve plug. (m) Detachable rollers -04 Nos (n) Extra bushing for Neutral out side the cable box for independent earthing for neutral earth. (o) First fill of fresh transformer oil confirming to relevant IS and tested up to 40 KV die electric strength. (Note :- The rate quoted is deemed to include the rate of making plinth after appropriate foundation with PCC 1:2:4 as per manufacturer instruction to install the transformer and the height of the plinth shall not be less than be 1 mtr from existing ground level or as directed by Engr-in-Charge).

Excavation in trenches in soft/loose soil n exc 1.5 metre wide and not exc 1.5 metre deep and getting out including forming bottom surface for laying HT/LT cable, foundations etc Complete all as specified and directed by Engr-in-charge.

Returning filling in including spreading levelling watering and well ramming in layer not exceeding 25 cm thick complete all as specified and directed by Engr-in-charge.

Removing excavated material n.exc 50 m and depositing where directed at a level n exc 1.5 metre above the starting point complete all as specified and directed by Engr-in-charge..

Supply and laying dry sand cushioning for UG cable protection in trenches with fine river sand complete all as specified and directed by Engr-in-Charge.

Supply and laying reinforced precast conicrete cable cover, class HV, type -1 flat, size 300 mm x180 mm x 40 mm complete all as specified and directed.

M&L for brick protection cover to underground cable with sub-class ‘B’ old size over burnt bricks laid dry and flat across the axis of cable, abutting each other with gaps between adjacent bricks not exceeding 10mm complete all as specified & directed.

Supply, laying & testing cable XLPE insulated, screened, PVC bedded, galvanized steel strip or wire armoured, electric power cables (heavy duty, Earthed type)with stranded aluminium conductor, 11000 volts grade, of size 3 core 95 sq mm complete all as specified and directed.

Supply and fix cable jointing kit for 11 KV grade cable for in door termination, heat shrink type, joint complete with jointing material and accessories suitable for3 core XLPE, armoured, Al conductor cable of size 95 sqmm complete all as specified and directed.

Supply and fix cable jointing kit for 11 KV grade cable for outdoor termination , heat shrink type, joint complete with jointing material and accessories suitable for 3 core XLPE, armoured, Al conductor cable of size 95 sqmm complete all as specified and directed.

Supply, laying and testing cable XLPE Insulated ,screened, PVC bedded, galvanized steel strip or wire armoured, electric power cables (heavy duty) 1100 Volts grade with stranded aluminium conductor of size 400 sq mm 3.5 core complete all as specified and directed.

Supply, Installation, Testing and commissioning of Automatic Phase Sequence Corrector of capacity 500 KVA capacity for Automatically Correct Input Supply Reverse Phase and also Protections against Single Phasing Voltage Unbalancing, Low Voltage High Voltage with time delay 3 to 5 Seconds complete all as specified and directed. Note :- 1. When phase sequence disturb, it will correct automatically. 2. It will prevent accident due to reverse rotation of motor shaft. 3. Also protect the motor from Single Phasing, Low Voltage & High Voltage. 4. Time Delay provides for healthy supply and protection of system due to transits. 5. It will protect against unbalancing voltage in two phase out of three phase supply. 6. Complete Electronic circuit based on IC based technology to ensure reliability. 7. Easy to connect with supply system. 8. The Unit will be Electronic Circuitary for the reliable operation at 415V 15 % 50 Hz 5 % with Electronics Relay's Transformers, suitable rating PVC moulded connecter with proper wiring of rated current copper conductor cable with copper lugs. The entire unit will be fitted in M.S. C.R.C sheet box with proper powder coating paints. TECHNICIAL SPECIFICATION Principal of Operations : Negative Sequence Voltage Sensing Systems Voltage & Frequency : 415 V ±15 % , 50 Hz 5 % Low & High Voltage cut off : 350 V & 480 V (Can be alter as per required). Single Phasing Unbalancing : Within 3 to 5 Seconds Low & High Voltage Protections Current Rating : 700 Amp Temperature Range : -5° C to 50° c Humidity : Up to 95 % R H HV. Test : 2 KV AC (RMS) 1 min. between live parts & body.

Supply, laying, and testing of P.V.C. Copper Multistand Cable of size 185 Sq mm 3.5 core for connection of Automatic Phase Sequence Corrector of capacity 500 KVA capacity complete all as specified and directed.

Supply, Installation testing and commissioning of Automatic Power Factor Correction (APFC) Panel for 3 Phase, 415 V & 50 Hz, Delta connection, Super heavy duty square cap capacitor with detuned reactor(Aluminium) of capacity 150 KVAR with 9 steps (6x12.5 KVAR +3x25 KVAR) complete all as specified and directed.

Supply, install, test and commissioning LT Panel board, TPN 415 Volts, 50 Hz, out door cubical type floor mounted CPRI approved factory made, double door dust and vermin proof IP-54, fabricated out of CRCA sheet not less than 3.15 mm thick with 2mm thick for internal compartment duly powder coated fixed on angle iron pedestal made out of 50x50x6 mm with cable chamber for individual feeders for incomming and outgoing connections, one set of LED indicator lamp RYB with switch and fuse and the panel board shall be provided with proper ventillation including suitable size of cable alley copper bus bar suitable for carrying of current 800 Amps with suitable connections from MCCB out going to main bus bar shall be carried out with TPN copper bus bars of suitable rating and connections from main bus bar to out going MCCB's (intake point) will be carried out with TPN copper bus bar as per MCCB rating duly insulated and colour coded heat shrinkable sleeve and shall be rigidly mounted on suitable size of bridge insulator including necessary PCC foundation of minimum 0.35 m height positioned and fixed with suitable nut, bolts, washers etc to the MC pedestal all as specified and directed comprising of the following :- (a) ACB with Microprocessor Release IPR 1 + (4 Pole) 800 Amps 4 Pole 50 Hz 415 V with thermal magnectic release having rupturing capacity 50 KA - 1Nos (Incoming). (b) MCCB 200 Amps 4 Pole 50 Hz 415 V with thermal magnectic release having rupturing capacity 25 KA - 4Nos (Outgoing). (c) MCCB 100 Amps 4 Pole 50 Hz 415 V with thermal magnectic release having rupturing capacity 10 KA - 2 Nos (Outgoing). (d) MCCB 63 Amps 4 Pole 50 Hz 415 V with thermal magnectic release having rupturing capacity 10 KA - 2 Nos (Outgoing). (e) 3 Phase digital multi function meter model A, class 1, 5A with relay Vega Series - 1No (f) Indicating lamp 240 volts LED type - set of three.

M&L earthing complete with copper earth plate 600 x 600 x 3mm thick buried directly in ground pit not less than 2.25 m deep below normal ground level with top edge of the plate not less than 1.5m below normal ground level connected to copper strip of size 20X3 mm duly encased in 25 mm bore light grade GI protection pipe both up to 7.5 mtr in length by means of brass nuts bolts check nut and wahsers starting from earthplate to panel/transformer side all as specified and including necessary excavation earth work, . PCC pit 40mm RCC cover made RCC (:2:4) type B1 using 20mm graded stone aggreagate concrete reinforced with 6mm dia bars 75mm C/C both ways with MS handle 12mm dia PGI funel wire mesh and GI pipe light grade 20mm for watering starting from top edge of the plate complete all as specified testing as per electrical plate No 3 of SSR 2009 (Part 1). The earth plate shall be surrounded with adequate quantity of charcoal dust with common salt, packed on all side of earth plate in alternate layers of thick ness 15 cm each including excavation, earth work in any type of soil, returning and filling in, removal of surplus soil to a distance upto 50 mtr complete all as shown on electrical plate No.3 of SSR Part- I 2009 complete all as specified and directed. .

M/S KAMAKHYA CONSTRUCTION AND BUILDERS

M/S. SUBHAS CONSTRUCTION CO.

HAMZA CONSTRUCTION CO

M.S. Construction

SRI HARSHITA ELECTRICALS