SPECIAL REPAIR TO BER TRANSFORMER AND ALLIES WORKS AT AF STATION DEVLALI

Amount

Supply & Installation, testing and commissioning of 1600 KVA, 3 phase, 50 Hz outdoor type ,step down, copper wound, winding delta connecting on Primary side (HV Side) and star connected on secondary side (LV side) in accordance with vector symbol Dyn11 (vector Group) with neutral brought out on LV side and looping on HV side for contact output OLTC (on load tap changer) should be +10 to -10% in steps of 2.5% (position total), oil immersed, naturally oil cooled (ONAN) confirming toIS :2026 & IEC62770, core type power transformer with no load voltage ratio of 33000/11000 Volts (corresponding to principal tapping ) with RTCC panel & locking device alongwith necessary control wiring with transformer and RTCC panel as per site requirement. The transformer shall be suitable for operation at a temperature of 50 /55 deg C full load loss at principal Tap at 75 deg C 20 KW (Sub to IS ToI), and shall be supplied with all accessories as per manufacturer such as lifting lugs, H.T / LT cable box on HT side and L.T cable on LT sides, earthing terminals with oil filling hole, oil drain cum filtering valve with plug oil filling cum filtering valve with plug, oil filling cum filtering valve with plug rating plate, silicagel breather, conservator with oil filling hole, oil surge relay, window for tap number, lifting eye bolts, HV & LV cable end box. The quoted rate shall also inclusive of excavation & PCC foundation for the transformer as per manufacturer recommendation.Considred temp rise as 50/55 °C as per IS 2026 Any other accessories deemed to be included as per manufacturer recommendation and rate shall be quoted accordingly.

Transformer shall be of BOLTLESS core design. Transformer shall be double wound, core type with low loss, non ageing, high permeability PRIME GRADE, CRGO with m4 grade or Better, Perfectly insulated and clamped to minimize noise and vibrations, core shall be purchased directly from manufacturer of core or from their accredited marketing network and not through any agent. Before placing order for procurement of transformer, the contractor shall submit the credentials in respect of the manufacturer of core and transformer shall be procured only after approval from GE in respect of name of manufacturer of transformer as well as manufacturer of core. The limit of termperature rise after continous full load runs as specified in IS/IEC 60076 shall be suitably adjusted to suit the ambient temperature of maximum 50 degree celsius prevailing at site all as specified and directed including having following characteristics :-

The transformer shall confirm to the latest edition of applicable standard as follows :- (i) IS-2026, for tests and tolerance of guarnteed Particulars. (ii) IS-3639 for Fitting and accessories. (iii) IS2099 for Bushing >1000V. (iv) IS-7421 for Bushing <1000 V (v) IS-1271 for Electrical insulation classified by Thermal stability.(a) Winding (i) HV Winding -Disc winding (ii) LV Winding- Disc winding (b) Insulation Level (i) HV-170 (ii) LV-70 (c) Insulation level (Power frequency with Stand KVrms) (i) HV 70 (ii) LV-28

OLTC (on load tap changer) should be +10 to -10% in steps of 2.5% (position total) Transformer as per IS :2026(part) - 2011 temp rise oil / winding should be 50 °C to 55 °C. over ambient. Temp of 40 °C Material of Winding - Electrolytic Copper (purity 99.99%) Insulation class - Class -A Insulation for Winding No load Losses at rated voltage & frequency - 2.5 KW (Sub to IS ToI) Losses at 50% load rated voltage & frequency - 4.85 Kw (Sub to IS ToI) Full Load loss at principal Tap at 75 deg C - 20 KW (Sub to IS ToI) Insulation Level - HV (KVp/KVrms) :170/70 LV ( KVp/KVrms) : 75/28 Impedance at 75° C(IS-ToI): 6.25%(+10% to -10%ToI) as per IS:2026 (a) Cable Boxes on 11 KV secondary side for single core XLPE cable 3 Core 185 Sqmm & Four Nos porcelain bushing suitable for 11 KV on LV side, complete with copper rods, nuts and washers with cable end box. (b) Outdoor 33 KV bushing insulator for connection through open conductor with sleeves, three Nos porcelain bushing suitable for 33 KV on HV side, complete with copper rods, nuts and washers. (c) Oil conservator with filling hole and cape drain valve and Prismatic/transparent oil level gauge.

(d) Explosion relief vent mounted on tank with double diaphragm and equilliser pipe connection to conservator air space (Pressure release device) (f) Air relief plug. (g) Shut off valve between the conservator and buchholz relay. (h) Drain valve with threaded adopter. Dial type thermometer for oil temperature indicator with 02 sets of contacts for alarm and trip having range 0-12 centigrade vapor pressure type with maximum reading pointer/Max temperature indicator and resetting device with alaram/trip contact capillary type Monogram plate(b)Thermometer pocket.(c)Air release plug.(d)Inspection cover (e) Lifting lugs for complete(f)Top cover lifting lugs transforme (g)rJacking lugs/Pads(h) Top filter valve(i)Drain cum bottom filter valves(j) Earthing terminal and stud to facilitate fixing of 50x6 mm galvanised iron earth strip for earthing of body.(k) Power transformer with neutral ground realy facility with locking arrangement.(l)Rating and Diagram plate(m)Double float Buchholz relay with trip and alarm contacts(n)Bi directional roller wheel -04 Nos.(o)Marshalling box for termination of all alarm & trip controls of the transformer.(p)WTI (Winding temperature indicator) with alarm & trip contact(q) Oil surge relay.(r)Shut off valve for buchholz relay (s) Detachable cooling radiators with drain First filling of new and unused transformer oil, IS-335 marked (Make: HP / Savita/Apar/Power Link filtered/dehydrated and tested upto 60 KV dielectric strength of 2.5 mm air gap between testing electrodes.

(i) The oil temperature and winding temperature guages shall be housed in a marshaling box made up of MS sheet as per manufacturer recommendations with hinged door and having glass front side of the box and provision for entry of cables and compression glands. (ii) Following documents to be submitted for core during the stage inspection: (a) Invoice of supplier (b) Factory test certificates (c) Packing list Note: Rate include following (i) Cost of installation in existing plinth, connection with existing incomming and out going cable connections , control cable to circuit breakers , setting of relays as per New transformer rating and earthing connections to existing earth test points. Cost of setting of all protective relays in existing substation as per New transformer rating synchonized to fault level of concern distribution company is deemed to be included in quoted rate.

(ii) Contractor shall submit the Manufacture Test certificate, PV (Factory Test sheets) before commencement of work and ensure the installation is as per OEM specifications and submit the Test results after instllation complete all specified and directed by Engineer in Charge and scope of work include factory Inspection by the rep of CE/CWE/GE as nominated by him and Testing of SEI, from HQ south command and cost thereof shall deemed to be included in the quoted rates.NOTE:- (iii) Any other items which are not mentioned above but are essential for smooth functioning of transformer shall also deemed to be included in the quoted rates. Make: Pactil / Siemens/ Voltamp / Schneider / Crompton Greaves / GE / Indotech/ Indian transformer and Electricals Pvt Ltd.

Supply, installation of 33 KV outdoor enclosure thickness 2.5 mm Porcline clad vaccum Circuit Breakar (PCVCB) for use on service voltage 33 KV Manual and electrical motor operated and 30 to 35 Mtr 3,6,12 core as require copper cable for connection of VCB breaker to control panel phase, 3 phase 50 cycles type are structure mounted easy to install for use 33 KV systems, made out of porcelain clad, three pole circuit breakers fitted with reliable and well proven vacuum interrupters by providing adequate phase clearance and heights to meet standard safety requirements, suitable for direct connection to overhead line and cables totally enclosed metal clad SF6 filled switch gear having repturing capacity 350 MVA, live tank type factory made switch gear cubical type floor mounting confirming to IS 13118 IEC-60056. The circuit breaker shall be complete with terminal connection, operating mechanism, control cabinets, piping, interpole cable accessories like gland, terminal block, lugs, 02 Nos level pressure switch scale. necessary steel support structure for CB and control cabinet .The circuit breaker shall be required to performs as per technical parameters given below:-

(a) Installation - Outdoor, 3-pole, Live-Tank, Porcelain Clad, Switchyard Breaker (b) Rated Voltage - 33 KV (c) Rated Current - 2000 A or higher (d) Power frequency with stand voltage/Basic insulation level (KV rms)- 70 KV (e) 12/50 microsecond lighting impuls with stand voltage insulation level peak (KV Peak)-170 kVp (f) Rated short circuit current breaking capacity (3 Sec ) at rated voltage specified 25.0 KA (g) Control Voltage incl. trip/close coil - 110V DC (h) Spring Charging Voltage - 230VAC (j) Short circuit withstand current and duration (KA/RMS) 62.5 KA for 3 sec (k) Rated short circuit Making Current (KA at Peak)-62.5 A (l) Out of phase breaking capacity (KA rms) as per IEC (m) Rated operating duty as per IEC(o) Temp rise over the design ambient temperature -As per IEC 62271-100 (n) Operating Mechanism -Spring (o) Creepage distance as per IEC-900 mm (p) No of trip/close coil 110 V DC-02 Nos (q) Tripping system - 110 V DC Note:- (i) Cost of supply and fix of Outdoor type Terminal Kiosk (TK) having terminals/disconnecting-links for termination of CT/PT wiring including PT secondary fuses complete all as required at site are deemed to be included in the quoted rate. (ii) Cost of construction of foundation including construction material and necessary earth work as per manufacturer design for breaker TK complete all as required at site are deemed to be included in the quoted rate.Breaker shall be comprising of following items fittings and accessories:- (iii) Outdoor VCB triple pole 2000 Amps 33 KV with rated short circuit breaking current 25 KA for 3 second totally enclosed with protection IP 55.

(iv) DC Closing & tripping coil -01 Set (v) DC power pack -01 No (vi) Motorised mechanism with motor, operating AC voltage - 01 No. (vii) Mechanical ON/OFF spring charge / disc trip circuit healthy indication-01 No (viii) Heater 100W with switch- 01 No (ix) Panel illumination lamp with switch-01 No. (x) Operation counter - 01No. (xi) Auxilary contact-5 NO+5NC - 01 Set (xii) Mechanical cable inter lock on door - 01 Lock (xiii) Pistol grip TNC switch - 01 No (xiv) Socket with switch (230 Volt AC 15Amps- 01 No.) (xv) Earthing termials - 02 Nos (xvi) Anti pumping device with contact -01 No (xvii) Guaranteed number of operations for vaccum interrupter-10000 Make :- L&T/C&G/ABB/Siemens

Supply,install,testing & commissioning Current Transformer Current transformer (CT) 33KV out door oil immersed single pole & self cooled of ratio 630/1-1 Amp naming VA burden 15VA suitable (for metering) + accuracy 1, for 1600 KVA load having VA burden 15 Volt Amps with accuracy 1.04 metering equipment VCB & class-5P 104 protection with air insulated CTs chamber mounted on & including necessary MS channel/angle iron complete all as specified - 01 Set (Set of three). Note :- Additional ratio is for potential differential for three pole/core type suitable for 3 phase system.

Supply,install,testing & commissioning Potential transformer 33KV /110 V, Accuracy class 0.5 and 3 P burden -10A 50 Hz bill -12/28 and VF 1.2 Cont 1.9 to hrs with PT fuse 3.15 Amp , PT oil immersed & self cooled type having adequte VA burden (Not less than 100V Amps suitable for metering equipment of VCB to be installed on & including MS channel angle iron (pedestal type all as specified - 01 Set (Set of three) confirming to IS-2705-1992.

Supply, installation,testing & commissioning of 33KV control & relay panel indoor type for Vacuum Circuit Breaker. The panel shall be with back access double door arrangement, dust and vermin proof , IP -4X class protection and made 2mm , CRCA MS sheet powder coated finsh over one coat of red oxide primer both side operating type, including internal wiring using 1.1kV FRLS insulated multistrand cable (2.5sqmm for CT/PT and control circuit, numbered and colour coded as per IS-5578/1984 having suitable entry for cable consisting of the following:-

(A) Main, Numerical Protection Relay with LCD displaying mimic bay for ON/OFF control and monitoring of feeder current. Built in as of 11 KV VCB panel relay disturbance recorder and event logger to monitor the Sequence of Events (SoE) using upto 800 event codes. The relay shall be communicable SCADA system. Make :-L&T, Crompton Greaves, ABB & Siemens. (i) Triple pole non directional, instantaneous IDMT relay for Over current and earth fault protection with minimum pickup at low set of 5% and 1% respectively (ii) Transient/intermittent earth fault protection (iii) Phase discontinuity protection (B) Flush mounted auxiliary relays for:- (i) Trip Circuit Supervision (ii) Master Trip & anti-pumping devise (iii) Fuse fail (PT) supervision operated (iv) DC supervision scheme (v) Overvoltage/ under voltage relay within max value settings with reset (C) Metering (i) Metering Equipment incl. 01 x Digital Voltmeter (Acc.Cl.0.5), 01 x Digital Ammeter (Acc.Cl.0.5), 01 x Tri-Vector-Meter (Acc.Cl.0.5). (ii) 01no. Multi-Function-Meter (Acc.Cl.0.5) shall be provided with LCD display for measuring current, voltage, power, power-factor and energy-parameters, Total Harmonic Distortion and Max. Demand Indication, same shall be communicable on Mod Bus via RS485 port. (D) Indicating Lamp. (i) Bus-01 Isolator ON/OFF. (ii) Bus-02 Isolator ON/OFF. (iii) Line Isolator ON/OFF/EARTH (iv) CB auto trip. (v) CB ON. (vi) CB OFF. ii) CB Spring Charge. iii) Trip circuit healthy. x) DC Available LED with push-button (x) R-Y-B Phase LED Indication (E) Semaphore indicator. (i) Circuit Breaker ON, OFF. (ii) Bus-01 Isolator ON, OFF. (iii) Bus-02 Isolator ON, OFF. (iv) Line Isolator ON, OFF, EARTH

(F) Control switches/Push Buttons (i) Trip-Neutral-Close Switch for Circuit Breaker Control - 01no. (ii) MCB for AC isolation - 01no. (iii) MCB for DC isolation - 01no. (iv) Heater switch with thermostat - 01no. (v) 3-pin socket with ON/OFF switch - 01no. (vi) LED Lamp with ON/OFF switch - 01no. (G) 08-Window Annunciator with hooter and Mute, Acknowledge, Reset and Test buttons for:- (i) OC Trip Alarm (ii) EF Trip Alarm (iii) Line Differential Trip Alarm (iv) PT Fuse Failure Alarm. (v) Trip Circuit Failure. (vi) Spare. (H) Test Terminal Block for CT (iv) Power analyser 3 phase 3 wire CT ratio 50-25/5-5, PT-33000/3/110/3 to measure (a) phase voltage (b) phase to neutral voltage (c) amp (d) inductive power (e) capacitive power (f) maximum demand indicator, having independent change over contacts to trip two different programmable demand. (viii) Disconnecting relay for oil/winding temp, buckles alarm & trip oil level alarm including alarm system & potential differential relay 3 pole / core type & suitable for 3 phase system (j) The cost of construction of foundation as per manufacturer design, necessary excavation, PCC work, demolition of floors/walls of substation including foundation frame steel mounting structure for VCB, PTs & CTs (supplied by OEM) for control panel as required at site are deemed to be included in the quoted rate. Note :- (i) Cost of setting of all protective relays in existing substation as per New transformer rating synchronized to fault level of concern distribution company is deemed to be included in quoted rate. Cost includes for the control panel with suitable size of copper conductor including GI pipe of suitable size of outdoor VCB indoor panel and control wiring from 110V DC power pack. (iii) The make of remote/indoor control panel be same as of VCB. (iv) Any other items which are not mentioned above but are essential for smooth functioning of VCB shall also deemed to be included in the quoted rates. Make :- L&T/C&G/ABB/Siemens

Material & Labour for Earthing complete with copper earth plate electrode 60cm x 60cm x 3.15 mm thick burried directly in ground vertically to a depth not less than 2.25 metre below ground level with top edge of earth plate at a depth of not less than 1.5 metre below ground level, earth plate surrounded by 15cm thick and packed layer of charcoal dust and common salt, connected to earth lead of copper Strip 20 x 3 mm (7.5 mtr) fixing on wall by means of bolts, nuts and washers of the earth wire.galvanised iron or steel and thimbles and other end of the earth strip connected to earthing test point and protected by galvanised iron pipe light grade 40mm dia and water pipe 20mm dia GI light grade with funnel and wire mesh, PCC chamber in cement concrete (1:3:6) type C-2 and CI cover with frame all as shown in electrical plate No. 5 of SSR part-I all as specified and directed

Note : The amount against Schedule of Credit on Page No. 33 shall be deducted from the total amount quoted against Sch 'A' while deriving lum Sum for Acceptance.

JAI DURGA CONSTRUCTION CO (BID ID -3376323)

M/s SCHOLASTIC ENTERPRISES (BID ID -3371176)

Bidder Name

JAI DURGA CONSTRUCTION CO

M/s SCHOLASTIC ENTERPRISES

M/S Hema construction