AUGMENTATION OF EXTERNAL ELECTRIC SUPPLY AT TENGA MIL STN UNDER GE TENGA

Supply, installation, testing and commissioning of power transformer copper wound transformer step down, outdoor type complete filled with oil, with standard fittings, HT 33 KV, secondary 11 KV, 3 phase, with ON load tap changer (OLTC) (in range +5% to -15% in steps of 1.25%) with remote Tap Cubical Changer (RTCC) Panel and Automatic Voltage Regulator (AVR) , all as per IS: 2026 of capacity 2500 KVA step down, outdoor type floor mounting, double copper wound core type 3 Phase 50 Hz AC, oil immersed with IS: 335 ISI marked filtered & dehydrated Transformer oil with 'ONAN' type cooling with external cooling tubes / radiators having no load voltage ratio33/11KV (corresponding to principal tapping) delta connected on primary side (HV incoming) and star connected on secondary side (secondary out going) in accordance with vector group symbol (DYN-11) conforming to IS : 2026 and having off load tap changer in the steps of 2.5% on HV side to take care of voltage from (+)7.5% (+)5% to (+) 2.5% to give output on 11 KV secondary side and including initial oil filling to appropriate level, control cable, and following standard fittings complete all as specified and as directed including the followings:- (i) Oil conservator with oil filling hole cap and drain plug. (ii) 01 No of prismatic oil level gauge mounted on conservator wall with first fill of charge upto maximum level. (iii) Silica gel dehydrating breather with oil seal and with first fill of charge. (iv) Pressure release valve with automatic resetting arrangement after release of pressure- 01 Set (v) Adequate No of thermometer pocket including one thermometer. (vi) Top oil filter valve. (vii) Bottom oil filter cum drain valve. (viii) Rating diagram and terminal marking plate. (ix) Earthing terminal - 02 Nos. (x) Lifting lugs - 01 Set. (x) Jacking pads - 01 Set. (xi) Under carriage with 4 Nos of plain rollers. (xii) Air release plug on main transformer tank. (xiii) Adequate Nos of cooling radiators.

(xiv) 100 mm dial type oil temperature indicator with maximum read pointer and resetting device. (xv) 100mm dial type winding temperature indicator with maximum read pointer resetting device (xvi) Air insulated cables box on HV and LV side.

(xvii) Buchholz Relay (having Contacts for Alarm & Trip). (xviii) OTI (having Contacts for Alarm & Trip). (xix) WTI (having Contacts for Alarm & Trip). (xx) Marshalling Box (having TTB Only). (xxi) On Load Tap Changer (OLTC) + Remote Tap Cubical Changer (RTCC) Panel+ Automatic Voltage Regulator (AVR). (xxii) HV Bare Bushing Note:Premises shall be carried out by Rep of Accepting officer. (ii) Prior to manufacture the contractor shall get the general arrangement, drawing and design details of the transformer approved from GE. (iii) After installation of Transformer at site , the pre-commissioning test shall be carried out by SEI/EI (iv) PCC foundation of adequate /required size extending 500mm all round more than size of Transformer, as per manufacturer design shall be included in quoted Rate. (v) Routine test shall be carried out as per IS 1180.

Supply, installation, testing & commissioning of Outdoor (IP55) 33kV 630Amps 25KA/3 sec. Non Extensible Compact switchgear consisting of 01 nos. fixed Manual Vacuum Circuit Breaker Module and copper Busbar in SF6 insulated stainless steel enclosure (2 mm thick, SS304 grade). The complete RMU must be type tested for Internal arc 25KA for 1 sec with AFLR Classification for Gas tank & Cable Chamber. HT RMU shall preferably have site replaceable bushings to have very less downtime in the event of bushing breakage and restoration can be done immediately without sending the RMU to OEM Works. Microprocessor based IDMT Relay for Circuit Breakers - Self Powered along with series trip coil (Modbus RS485 complaint) for each VCB Module. Capacitive voltage indication fixed type system with LED for all feeder. SF6 Gas pressure indicator on the gas tank. Operating sequence of VCB must be O-0.3Sec-CO-3 Mins-CO amd suitable for 10000 mechanical operation. CT shall be minimum 50-100/1-1A (double core),2.5VA (for all VCB) , 5P10 - 3 nos. for protection. Transformer Protection Scheme differential relay, WTI, OTI , Bucholz ( Trip + Alarm ) and PRV Trip , MOG- Alaram, A (Master trip relay+ Aux relays+ 12 window annunciator with Hooter) only for outgoing VCB module (for OG VCB module) Aux-Powered Relay for Over current and Earth Fault Protection with RS-485 Port & Electrical trip indication ( Protections 50,51,50N,51N,68,49 ,95,86). The Vaccum Interrupter must SF6 manufacturer's own make.

Microprocessor based IDMT Relay for Circuit Breaker - Self Powered along with series trip coil (Modbus RS485 complaint) for VCB Module. Capacitive voltage indication fixed type system with LED for all feeder SF6 Gas pressure indicator on the gas tank. Operating sequence of VCB must be O-0.3Sec-CO-3 Mins-CO amd suitable for 10000 mechanical operation. CT shall be minimum 40/1A ,2.5VA , 5P20 - 3 nos. for protection Touch proof screen seperable right angle boot to be provided in module as SF6 OEM's recomanded make and termination to be done by RMU OEM at site. - 01 Set Safe Plus 36 type V: Vacuum Circuit Breaker 36kV, 630A, 25kA - 01 Nos Stored energy mech. for motorized operation 24V DC with ON-OFF PB - 01 Nos Closing & opening coil 24V DC - 01 Nos Integrated manual operated disconnector switch (DS) - 01 Nos Integrated manual operated fault making earth switch (ES) - 01 Nos Aux NO-NC contacts - VCB- 3NO+2NC, LBS-1NO+1NC, ES- 1NO+1NC Cable door Arc proof with Interlocking Cable support bars standard for single run termination Cable bushings interface C (400 bolted), 630 A Cable size up to 1RX3CX400 Sq.mm Separable screen connectors suitable to terminate 33KV 1Rx3Cx120 sq.mm. XLPE AL Conductor Capacitive voltage indication fixed type VPIS - 01 Nos Aux-Powered Relay for Over current and Earth Fault Protection with RS-485 Port & Electrical trip indication ( Protections 50,51,50N,51N,68,49 ,95,86) Protection LT CT: 50-100/1A, 5P10, 2.5VA - 03 Nos Metering LT CT: 50-100/1A, Class 1.0, 2.5VA - 03 Nos Multifunction Meter for OG VCB module - 01Nos

Transformer Protection Scheme WTI, OTI , Bucholz ( Trip + Alarm ) and PRV Trip , MOG- Alaram, A (Master trip relay+ Aux relays+ 12 window annunciator with Hooter) only for outgoing VCB module (for OG VCB module) Top Low voltage box with terminals, wirings, instruments LR Switch - 01 Nos

36kV Indoor single-phase epoxy cast resin voltage transformers cast resin Ratio: 33/rt3/110V/rt3, BIL: 36kV/ 70kV/170KVp Core I: Burden and Accuracy (Secondary): 50VA Cl 1.0/3P Frequency 50Hz, Insulation Class B Metal Enclosed switchgear: IEC 62271-200 General Purpose switches: IEC 60265-1 Disconnectors and Earthing switches: IEC 62271-102 Switch Fuse Combination: IEC 62271-105 Common clauses: IEC 60694 Pressure of SF6 gas: 1.4 bar at 20 °C Cable bushings outside cone: CENELEC EN 50181 interface C Temperature class: -25 °C - +40 °C OUTDOOR Degree of protection: - SF6 tank: IP 67 - Front cover: IP 2X - Cable cover: IP 3X - Enclosure IP 54 Busbars: 300 mm2 Cu Earth bar (external): 120 mm2 Cu - Bolt dimension: M10 Thickness of Stainless-Steel Tank: 2.0 mm SS-304 Vacuum Interrupter Colours/Paint: Thickness min. 80 microns - Front cover: RAL 7035 - Enclosure IS 632 - Internal arc classification IAC-AFLR 25KA-1Sec (Tank + Cable box) ELECTRICAL DATA – 36 kV Nominal voltage: 33 kV Rated frequency: 50 Hz Rated current for busbars: 630 A Rated current for cable switch disconnector: 630 A Short time withstand current (1 sec) cable switch disconnector: 25 kA RMS Rated current for transformer T-off: 630 A Short time withstand current (3 sec) V-module vacuum circuit breaker: 25 kA RMS Impulse withstand voltage: To earth and between phases: 170 kV Insulation level: Power frequency 1 min: 70 kV NOTE :- (i) Configuration and schematics arrangement of panel shall be got approved from GE before fabrication. (ii) Any other parts/items not specified above but have been required essential for smooth and safe functioning of panel system shall be quoted rate. (iii) The VCB/RMU will be tested as site as primerary injector system and relay will not be set as per load requirement. (iv) Panel should have heating element with thermostat to avoid moisture condensation in the panel. (v)Pre-dispatch inspection at OEM factory premises shall be carried out by Rep of Accepting officer. (vi)After installation of RMU at site , the pre-commissioning test shall be carried out by SEI/EI (vii) PCC foundation of adequate /required size as per manufacturer design shall be included in quoted Rate.

Rated frequency: 50 Hz Rated current for busbars: 630 A Rated current for cable switch disconnector: 630 A Short time withstand current (1 sec) cable switch disconnector: 25 kA RMS Rated current for transformer T-off: 630 A Short time withstand current (3 sec) V-module vacuum circuit breaker: 25 kA RMS Impulse withstand voltage: To earth and between phases: 170 kV Insulation level: Power frequency 1 min: 70 kV NOTE :- (i) Configuration and schematics arrangement of panel shall be got approved from GE before fabrication. (ii) Any other parts/items not specified above but have been required essential for smooth and safe functioning of panel system shall be quoted rate. (iii) The VCB/RMU will be tested as site as primerary injector system and relay will not be set as per load requirement. (iv) Panel should have heating element with thermostat to avoid moisture condensation in the panel. (v)Pre-dispatch inspection at OEM factory premises shall be carried out by Rep of Accepting officer. (vi)After installation of RMU at site , the pre-commissioning test shall be carried out by SEI/EI (vii) PCC foundation of adequate /required size as per manufacturer design shall be included in quoted Rate.

Supplying, Installation, Testing & Commissioning indoor type panels shall be constructed from CRCA/ Aluminium Zinc coated steel sheet of 2 mm thickness, floor mounted metal enclosed, 11 KV VCB panel with VCB totally enclosed and fully interlocked,IP -54 horizontal draw out, horizontal isolation type breaker as per IEC-62271-1,100,200, as amended up to date and additional SPecifications, having capacities as mentioned below, single break, trip free mechanism, manually charged and manually closing breaker suitable for use on 11 KV, 3 phase, 50 Hz A.C. supply with short circuit fault level of 26.3kA for 3 sec with under voltage relay, over voltage relay, Panel shall be full internal arc tested i.e. in all three chambers at 26.3kA for 1 sec for safety purpose (AFLR). compete with self contained, fully interlocked, rack in and rack out mechanism, air insulated HT sleeved (PVC sleeve is not accepted) self supported copper bus bars of 630 amps capacity, breaker featured with mechanical ON/ OFF indicator with hand trip coil and auxiliary switch of 4 NO+4NC and equipped with following switchgears and accessories. Make of Vacuum interrupter, circuit breaker, Panel, relays & meters shall be same. Cable compartment suitable for 2RX3C x 240 sq. mm XLPE 11 KV cable (Cable entry from bottom) end termination with heat shrinkable jointing material etc as reqd. There must be a viewing window on VCB chamber door and same must be as per Internal arc test report. The basic insulation level of entire panel shall be 28KV(RMS) / 75KV(Peak) complete all as specified and directed. (a) 630 Amp VCB - 01 Nos (b) 11 KV / 110 Volts PT Class 0.5 accuracy and 50 VA burden with 1 No. Voltmeter(0-15 KV), digital type selector switch for voltmeter and protection fuses / MCB for HT metering upto 12 KV on incomer. (0-50-100A) comply with IS 3156. PT must not be on the top of the panel. It must be floor rooled placed rear side of panel or on the CB trolley -1 Set. (c) Digital type multi function meter and Digital type Ammeter & Voltmeter - 1 No. (d) Flush mounted type Microprocessor based numercial IDMT relay (VCB Panel manufacturer's own Make) with O/L, E/L and S/C communicable on modbus protocal for protection and Status monitoring with Master trip and Trip Ckt Supervision relay. Relay shall have programable 4 digital Inputs and 6 outputs. -1 No.

(e) Dual core /single core;separate sets, dual ratio 3 Nos. CTs 100/50/1 A of 5 VA burden and accuracy class 0.5 for metering and class 5P10 for protection comply with IS 2705 - 1 Set (f) R,Y,B ON, OFF, Trip Indication with Control MCB - 1 Set (g) Annunciator -8 Window- 1Set (h) Power panel pack with 220 Volt AC input & 110V Volt DC continuous output suitable for closing / tripping / indication etc (j) Flash mounted Aux. Relay as required for OTI, WTI & Buchloz Alarm & Trip functions Top Low voltage box with terminals, wirings, instruments NOTE :- (i) Configuration and schematics arrangement of panel shall be got approved from GE before fabrication. (ii) Any other parts/items not specified above but have been required essential for smooth and safe functioning of panel system shall be quoted rate. (iii) The VCB will be tested as site as primerary injector system and relay will not be set as per load requirement. (iv) Panel should have heating element with thermostat to avoid moisture condensation in the panel. (v)Pre-dispatch inspection at OEM factory premises shall be carried out by Rep of Accepting officer. (vi)After installation of VCB at site , the pre-commissioning test shall be carried out by SEI/EI (vii) PCC foundation of adequate /required size as per manufacturer design shall be included in quoted Rate.