PROVN OF SERVO VOLTAGE STABILIZER AT VARIOUS WATER SUPPLY INSTALLATIONS UNDER AGE E/M-I OF GE DEHRADUN

DESCRIPTION OF ITEMS

Supply, installation, testing and commissioning of 500 kVA Three-Phase Automatic Voltage Stabilizer, naturally oil-cooled, indoor type, suitable for operation on 3-phase, 415 V, 50 Hz AC system. The stabilizer shall be designed to maintain jerk less output voltage at 415 V ±1% for an input voltage variation from 350 V to 460 V confirming to BIS 9815 (Part-II).The vltage stabilizer shall have efficiency not less than 98% and shall be free from distortion in wave forms. The unit shall be complete with servo-controlled voltage correction system, copper-wound transformer, oil-immersed construction, protection against overload, short circuit and over/under voltage conditions, digital metering/indication for input and output parameters, necessary control circuitry, terminal arrangements, foundation hardware and all accessories required for satisfactory operation, complete all as specified and dircted.

Description all as per item No 1 above but cpacity 300 kVA complete all a specified and directed.

Description all as per item No 1 here in before but cpacity 100 kVA complete all a specified and directed. Note for Item No 1 to 3: (a) Servo voltge stabilizer shall be conforming to BIS 9815(Part-I) : 1994 (Second Revision).The performance requirement should be as per para 9 of the BIS 9815 (Part- I) which is reproduced as under:- (i) The corrector shall keep the outut voltage within ±1% of the rated voltage irrespective of load and input voltage range, as per clause 9.1 of BIS. (ii) the rate of correction of voltage shall not be less than 6 V/s between phase and neutral. The corrector shall be free from hunting during automatic operation, as per clause 9.3 and 9.4 of BIS. (iii) The manufacturer shall state the no load and full load losses corresponding to minimum and maximum rated input voltages. The tolerances on thes declared values shall be provided in Table 7 of IS 2026 (Part-I) : 1977. The no load cureent shall not be more than 5% of the rated output current, ref clause 9.4 & 9.5 (iv) The efficiency of servo voltage stabilizer shall not be less than 95% as per clause 9.6 of BIS. (b) The testing of servo voltage stabilizer should be carried out in accordance with para 1.2 of the BIS 9815 (Part-I) (c) Type test report as per clause 11.1 for any rating as per clause 5.1 of BIS 9815 (Part-I) should be produced by manufacturer for the specified capacity / next higher capacity of any voltage range from Govt. Lab / NABL accredited Lab.

Excavation in trenches in soft or loose soil not exceeding 1.5 Meter wide and not exceeding 1.5 Metre deep in any type of soil including cutting in slopes etc. for laying of pipe line including getting out, complete all as specified and directed.

Supply and fixing of HDPE DWC pipe of size 110/90 mm dia as per IS 16205 for laying of XLPE cable, complete all as specified and directed.

Returning, filling in, including spreading, leveling, watering and well ramming in layers in soft / loose soil not exceeding 25 cm in each layer complete all as specified and directed.

Removal of excavated material (Soil) to a distance up to 50 Metre from starting point and depositing where directed at level not exceeding 1.5 Meter above as directed.

Supply, laying and testing cable XLPE Insulated ,screened, PVC bedded, galvanized steel strip or wire armored, electric power cables (heavy duty) 1100 Volts grade with stranded aluminum conductor of size 240 sqmm 3.5 core, laid in trenches/ducts/along poles/through pipe under road etc with new aluminium lugs of cable size complete all as specified and directed. Notes: (a) Excavation, returning, removal, sand cushioning, cable protection covers, GI protection pipe etc shall be measured and paid separately. (b) Any damage done during cable excavation to the existing UG infra like UG pipelines, UG electric cables, OFC etc shall be repaired by the contractor at their own expenses. (c) Cost of T&P required for handling/ laying of cable is deemed to be included in the rate quoted by the contractor.

Description all as per item No 8 above but , electric power cables (heavy duty) 1100 Volts grade with stranded aluminum conductor of size 120 sqmm 3.5 core, complete all as specified and directed.