Annual Maintenance Contract of grid station delina and 220kv zatl amc of 220 / 132 / 33kv delina grid station and 220kv zdtl , grid stations , power transformers: general checking / visual inspection of transformers ( i ) checking / arresting of oil leakages ( ii ) checking of auto starting of fans , external cleaning of radiators , cleaning of marshalling boxes of transformer and oltc , ( iii ) tightening of terminations , checking of oltc driving mechanism , electrical checking / testing of prv , buchholz relay , oltc surge relay / checking of alarm & trip and checking / tightening of earthing connections , checking of earth resistance of neutral and ( iv ) replacement of silca gel of breathers for 50mva power transformers , conducting of scheduled preventive tests of power transformer viz . ir , bdv , ppm , tan-delta / capacitane of bushing / winding and dga , checking oil level of conservator tank & topping of oil if required by way of dehydration / filteration including cost transformer oil for 50mva / 20mva , onload oil filteration for 53 . 33mva / 50mva / 20mva transformers , repairing of cooling fans of transformers including replacement of damaged winding , bearing if required , overhualing of circuit breaker :- checking of gas pressure , pressure switch setting etc , checking of healthiness of accumulator by checking the pre-charging pressure when building up pressure from zero , checking of operation of safety valve , cleaning of breaker units , checking of protection equipmentsand replacement of defective ones , i . e . , complete inspection and testing of sf6 type circuit breakers inclusive of operating mechanism . maintaining gas levels , venting of circuit breakers , replacement of o-rings , gas kits including circuit breaker analysis by cba etc . , fixing tripping & closing coils for 220kv / 132kv sf6 cb ( rate shall be quoted per cb ) , fixing tripping & closing coils for 33kv vcb ( rate shall be quoted per cb ) , filling of sf6 gas to maintain requisite pressure of sf6 cbs , fixing latches / remote switches , spring , toggle switch for sf6 cb and vcb , spring charging motor ( rates shall be per 220kv / 132kv cb ) , fixing latches / remote switches , , spring charging motor ( rates shall be per 33kv cb ) , fixing vacuum interrupter of repute make for 33kv vcb ( siemens / cgl / abb / bhel ) , current transformers :- checking of bellow expansion , checking of oil leakage in terminal box , checking of primary connection strips , checking of healthiness of gaskets , checking the tightness of all connections including earthing of pf terminal , cleaning of porcelain , marshalling box and junction box , checking cleanliness / tightness of all electrical connections including earthing of all marshalling boxes , ct secondary terminal , space heater and illumination , healthiness of secondary terminal bushing , checking of oil level , measurement of ir value tightening of jumpers , ct analysis with the help of cta etc . , 220kv / 132kv ct , 33kv ct , cvts / pts :- visual checking of earthing hf point ( in case it is not being used for plcc , checking of any breakage or cracks in cementing joint , cleaning of cvt capacitor stacks and tightness of terminal connections , checking of space heater and illumination in pt mks , checking and tightness of all connections including earth connections cleaning of porcelain , marshalling box and junction box , checking of healthiness of gaskets , checking of neutral earthing in cvt , healthiness of all gaskets and oil level . measurement of ir value and tightening of all connections and droppers . , 220kv / 132kv cvt , 33kv pt , surge arrestors :- checking of leakage current ( third harmonic resistive current ) , testing of counters and leakage current meters , checking of earth connections between surge arrester , surge monitor and earth , checking of leakage current after cleaning of porcelain surface , measurement of ir value and tightening of droppers and testing of counter and leakage of current meters , cleaning of insulators , checking of earth cennections between surge arrester , surge monitor and earth . , 220kv / 132kv la , 33kv la , isolators :- maintenance of linkages including transmission gears , stopper bolts . cleaning of auxiliary switch contacts and greasing with silica grease , cleaning of support insulators , termination contacts , checking of elecctrical / mechanical interlocks with e / s and cb , mounting bolts , alignment , nuts , pins , space heater , illumination , healthiness of gaskets , auxiliary contacts , alignment of earthing blades , operation of earth switch , almunium / copper flexible conductor , earth connections of structures and mb . lubrication of operating mechanism , hinges lock joints , levers , bearings , main contacts , cleaning of post insulators , tightening of clamps , bolts / nuts . , 220kv / 132kv isolator , 33kv isolator , reparing of three phase motors of isolators including replacement of damaged winding and bearing . , providing / replacement of damaged / burnt droppers , jumpers for isolators / breakers / transformers / ct / pt / pi / la etc . 132kv & 33kv switch yards , replacement of damaged clamps & connectors for isolators / breakers / transformers / ct / pt / pi / la etc . for 132kv & 33kv switch yards as per tech specs . & drgs to be provided by the department , post insulators :- checking of insulators for cracks and cleaning of insulators and tightening of droppers for 132kv & 33kv level ( rate shall be per pi ) , fixing of post insulators ( if damaged ) as per tech specs . & drgs to be provided by the department , 220kv / 132kv pi , 33kv pi , checking & tightening of bus bar & its clamps / jumpers / droppers including adjustment of sags . ( rate shall be per meter conductor ) , fixing of bus bar conductors , its droppers / jumpers including requisite clamps ( if damaged ) ( rate shall be per meter conductor ) , provididng and fixing of disc insulators ( 70kn / 90kn / 120kn ) ) , visual inspection & checking & tightening of all bolts , nuts with washers of gi latice towers , beams and equipment pipe structures , 220kv / 132kv bay , 33kv bay , providing and fixing of missing / damaged gi bolts , nuts with washers and gi lattice members of towers , beams and equipment pipe structures , illumination system :- inspection / checking healthiness of fittings & luminaries of control room , office , residential quarters , sentary post . main entry gate and repairing and replacement if required . , out door illumination system :- inspection / checking of healthiness of fittings & luminaries & mcb , lighting panels of outdoor switch yard , including high mast . , providing & replacement of damaged / burnt items . viz . mcb , fuses , fixtures , pvc frls cable , led lamps / tubes / led flood lights , in outdoor yards if required . , battery bank: inspection / checking and cleaning of battery cell terminals , application of petrolium jelly , if required , conduction of battery impendence and discharge test & checking voltage temperature , current , terminals voltage and battery discharge testing etc . , battery charger :- inspection / checking of control cards , measurement of test point voltage values , testing of dc earthfault and u / v relays , ir measurement of charger transformer , cables , checking of earthing etc . checking of charger panel and dcdb for electrical connections , cleanliness etc . , protection system :- inspection / checking of protection relays and application of ccl4 for cleaning , checking of control wiring rate shall be per panel including / installation , commisioning and testing of protective relays ( relay will be provided by department ) , cleaning of cable trenches and cables including of dressing of cables , setting right the cable trays & racks etc , auxilary transformer :- inspection / checking of bush
