Provn of 1.5 MVA HT Automatic Voltage Regulator with connected works at 33/11 KV MRS of JAK LI RC under GE 970 EWS

Supply, installation, testing and commissioning of copper wound HT, AVR suitable for outdoor installation of capacity 1500 KVA, suitable outdoor HV input voltage range of 7 KV to 12 KV, HV output voltage 11 KV (+/-) 1% with the following all standard fittings, such as silica gel breather, temperature gauge, bucholz relay, WTI & OTI trip & alarm including by pass connections with all control cables of appropriate rating technical specifications of HT AVR, complete with the followings :- (A) RATINGS :- Rating in KVA : 1500 KVA, Number of phases & Frequency : 3 Phase 50 Hz. Type of cooling : ONAN, Rated Voltage : 11 KV, Input Voltage Range : 7 KV to 12 KV, Input Current Range : 123.72 Amp to 72.17 Amp, Output Voltage : 11 KV +1% Output Current : 78.73Amp, Correction Rate : KV/ Second : 50V/Sec, Operating frequency : 50 HZ, Duty Cycle : 100% Continuous Load, Type of Load : More than 99%, Guaranteed Over-all efficiency : 98.65%, Winding : Electrolytic grade copper purity 99.08% IMPEDANCE : 1.95%,

(L) TERMINATION ARRANGEMENT :- H.V SIDE (CABLE BOX) : Auxiliary L.V. (Cable box), Disconnecting Chambers for HT, Conservator with oil filling hole with cap & drain plug with extension of pipe. Detachable radiator with shut off valve, Oil level gauge with 3 position, Filter valve 25mm size, Air release valve, Rating & terminal marking plate, Weather proof Marshaling box with connection for above auxiliary protection with Lamp holder with Switch. (M) Miscellaneous :- Test Required : Routine Test, All routine test as per IS : 2026, Oil Pressure & Vacuum with stand test : 7 PSI, Colour shade : D.A.Gary. (N) GENERAL ARRANGEMENT :- The unit consists of following :- (i) Stepdown Transformer- Double wound Delta/Star connected. (ii) ‘ON’ Load Voltage Regulator, Auto wound Delta connected. (iii) Buck-Boost Transformer, Double wound, open/open connected. (iv) Automatic control gear consisting of :- One Electronic Voltage Relay, One Reversing Stepsyn type geared motor unit, Two limit switches in order to avoid over running highest and lowest positions, chain drive, coupling device and all electrical connection.

(O) CONSTRUCTION :- The items N (i) & N (iii) above will be housed inside a well ventilated sheet steel tank and mounted on feet and items shall be supplied with first filing of oil, fittings would include :- (i) Rating & Diagram Plate (ii) Silica gel breather (iii) Earthing Terminals (iv) Lifting lugs (v) Drain valve (vi) Air Release plug (vii) Oil Conservator with Oil level indicator (viii) Filter valve (ix) Pressure Relief Valve (x) W.T.I. & O.T.I (xi) Buchholz Relay (P) GENERAL FEATURES :- (i) HAND CONTROL :- Hand wheel will be located on the front of the Regulator tank at convenient operative height. (ii) MOTOR CONTROL :- Raise / Lower push button control by means of small single phase reversible geared motor of permanent capacitor type will be provided. Limit switches will be fitted to restrict the travel at extreme positions. With this arrangement, it would also be possible to provide remote control to the Regulating Unit. The reversible geared motor would be of ‘Step-Syn’ type. (iii) AUTOMATIC CONTROL :- For automatic correction of fluctuating supply voltage, we shall provide Electronic Relay which in its simplest form, senses the Output Voltage and provide signal to the driving motor for necessary correction. Note :- The contractor shall get approval of design & drawings of equipment(s) from Accepting Officer before procurement of equipment(s).

(e) Conductor cable as per manufacturer's instructions as required at site-01 Job. (f) The contractor shall submit a type test certificate to the Engr-in-charge / GE for approval before placing the order. Conditions:- The switchboards shall be designed to operate under site conditions as specified in the datasheets. If not specifically mentioned therein, a design ambient temperature range upto +40°C and an altitude not exceeding 1652 meters above mean sea level shall be considered. (i) All openings, covers, and doors shall be provided with suitable gaskets around the perimeter to make the switchboard dust and vermin proof. (ii) Each unit of the switchgear shall have necessary internal sheet metal barriers to form separate compartments for circuit breakers, busbars, instruments and relays, cable connections, etc. Compartments for cable connections shall allow cable termination and connection work with the switchgear energized. A suitable interlock shall be provided such that the cable compartment can be opened only when the earth switch is ON or Earthing truck is inserted. (iii) All joints and connections of the panel members shall be made by zinc-passivated high-quality Grade 8.8 or superior steel bolts, nuts and washers, secured against loosening. (v) Suitable eyebolts/ lifting clamps shall be provided for the lifting of the panel/shipping section. (vi) A rear door interlock shall be provided i.e rear door can not be opened unless the breaker is in the test position.

Space Heaters:- (i) The panels shall be provided with space heaters to prevent moisture condensation, and maintain cubicle temperature 5°C above the ambient. (ii) The space heaters shall be located at the bottom of the panel and shall be controlled through a double pole MCB and a thermostat with an adjustable setting range of 30 to 70°C. Space heaters shall be supplied from 240V AC auxiliary bus for a space heater. (iii) The work also include the interconnection of existing VCB Panel with complete bus bar connection arrangement and enclousure with above mentioned VCB Panel. The cost of the same shall be deemed to be included in the rates qouted by the contractor (iv) Cost of any other item required to complete the job, is deemed to be included in the rate quoted by the contractor complete all as specified and directed.

M&L cable jointing kit for 11 KV (Earthed) grade cable for indoor termination heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 95 Sqmm, complete all as specified and directed.

M&L plain cement concrete 1:4:8, type D-2 (using 40mm graded crushed stone aggragate) as in foundation, filling in etc., complete all as specified and directed.

M&L cement concrete 1:2:4 type B-1 (using 20mm graded crushed stone aggregates) as in copings, kneelers, bed plates, kerbs and the like including weathering, slightly rounded or chamfered angles and throating form work, complete all as specified and directed.

M&L brick work with sub class 'B' bricks, old size, straight or curved on plan exceeding 6 Mtr mean radius, built in cement mortar 1:6, complete all as specified and directed.

M&L 15mm thick rendering in cement mortar 1:4 on fair faces of brick wall or concrete surfaces, finished the surface even and fair without using extra cement, complete all as specified and directed.

Excavation in trenches, not exc 1.5 mtr wide and not exc 1.5 mtr in depth for laying/ taking out of XLPE cables, foundation of pole, ducts etc. and getting out in any type soil, complete all as specified and directed.

Returning, filling in trenches including spreading, leveling, watering and well ramming in layers not exc 25cm thick, complete all as specified and directed.

Removing surplus excavated soil to a distance not exc 50 mtr and depositing where directed at a level not exc 1.5 mtr above the starting point, complete all as specified and directed.

M&L dry river sand, laid in trenches for cable protection, as 15cm thick below the cable and 8cm thick above the cable, complete all as specified and directed. Note :- Punned thickness of sand shall be measured and paid.

Supplying and laying reinforced precast concrete cable cover, Class HV, Type 1, flat, size 300mmx 180mm x 40mm, as per IS-5820-1970, ISI Marked, complete all as specified and directed.

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