WORk

Amount

Details of Work.

Major overhauling and repairing work of following 132 KV SF-6 Gas and air compressor type Circuit Breaker at 132 KV Substation Bharua Sumerpur under ETD Hamirpur :-

(A) 132 KV SF-6 Gas and Air Compressor type, 120 - SFM - 32 A Circuit Breaker (CGL Make) of 132 KV Transfer Bus Coupler bay (Mfg. Year - 1986) at 132 KV Substation Bharua Sumerpur under ETD Hamirpur. By doing following works in circuit breaker :- (i) Cleaning of porcelain of drive insulator from outside of each pole. (ii) Checking & adjustement of snatch gap, travel of drive insulator rod & tie rod of each pole. (iii) Opening of opening & closing coil assembly, D-rusting & greasing of all these parts, checking of charging ratchet. Replacement of all O-Rings of Gas pipe assemby of mechanism, checking of motor limit Switch, auxiliary contactors, power contaclors. (iv) Oiling & greasing of crank gears by opening of lock circlip etc. (v) Retightening of all these connections, satisfactory operation from local as well remote. (vi) Dismantling of pneumatic system of mechanism assembly and dismantling of control valve assembly, main spring, cleaning, lubrication and replacement of control valve sheet, cap. seal assembly, O ring P- 80, cap. seal assembly, roller C&D and re - fitting the same. (vii) Checking operation of circuit breaker from remote and local. (viii) Checking electrical connection in the marshalling box and tightening all electrical connections and replacing compressor belt with proper size. (ix) Complete dismantling of compressor from breaker structure and dismantling of all its parts and drain out all used oil from the compressor, replace all piston rings, piston head, gaskets, flat finger plate, air filter and seal (if required) and re - fitting the same with all proper adjustment. (x) Fill special compressor oil upto specified value and check manually its proper function and remount the compressor into breaker cubicle and fitting with the motor with proper alignment and replacing compressor belt with proper size. After major overhauling and repairing work of above gas circuit breaker, following tests are to be carried out :- (i) Opening & closing time of breaker of each pole. (ii) Carrying out Contact Resistance Measurement (CRM test) of each pole. (iii) Checking of megger values of breaker poles. (iv) Checking triping of breaker at 70% DC voltage. (v) Checking the CLOSE/OPEN operation of breaker from REMOTE & LOCAL. (vi) Prepare and submit the site ovehauling report of each breaker.

Rates qouted by the bidders shall be without taxes. Taxes applicable if any to paid extra

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