REPAIR AND MAINT TO HT CIRCUITS INCL HT CABLES, TRANSFORMERS, RMUs, VCBs AND CONNECTED ITEMS AT NIWARU MIL STN

Supply and filling / topup new mineral grade transformer oil (ISI marked) EHV type conforming to latest IS-335 for filling in transformer duly filtered with filtration plant to obtain high dielectric strength above 70 KV complete all as specified and as directed. Note : Transformer oil shall be supplied in sealed barrels with test certificate. Cost of barrel shall be deemed to be included in the unit rate quoted by the contractor . Nothing extra shall be paid on this account. If oil is used for top up no schedule of credit will be deducted. Only in replacement case old oil will be issued under schedule of credit.

M&L for Dehydration / filtration of transformer oil in existing installed transformers at site with portable dehydration plant to improve the dielectric strength to 70 KV or above during in cyclic manner including testing of dielectric strength after dehydration at site. Transformer oil will be topup to desired level before dehydration. Note- Applicable for item no 1 & 2. (i) Oil shall be tested after filtration and test result will be recorded before & after filtration of oil. (ii) Contractor should make his own arrangement for oil filtration plant including transportation complete. (iii) Transformer oil for topping up will be measured and paid in relevant item as required. (iv) Replacement of minor parts like Drain valve,oil seal will be included in unit rate quoted above.

M & L for onsite trasformer repairing for identifying oil leakage location, preventing oil leakage / any other type of minor fault such as HT / LT bushing replacement / gasket replacing / gate valve replacement by draining out the oil and refilling after filteration & dehydration and testing all as specified and directed by Engineer-in-Charge. Note:- (i) Rate of any type Rubberised cork/neoprine gasket is included in the unit rate quoted above. (ii) HT / LT Bushing as supply only will be paid saperatly.

Material & Labour for disconnecting of defective/ unservisible transformer 63 KVA to 200 KVA capacity (indoor/outdoor type) 11KV/433 volts copper wound from power mains and dismantling the same from 2/4 pole structure/ platform mounted and transporting the same to workshop in the presence of rep of AGE E/M and opening the transformer cover, draining out of transformer oil, removing of the burnt parts i.e.windings, tape, paper insulating strings etc gently and carefully, washing of the dust, rust and dirt from all parts including taking out HT/LT leg coil core tank and cooling tubes, painting the inner side tank by zinc chromate paint and preparing the same for re-assembling after carrying out required repair and installation on existing 2/4 pole structure/ platform with necessary fixing arrangement including connecting up electrically, commissioning and testing etc complete all as specified and directed by Engineer-in-Charge and specified in particular specification of the following capacity :- NOTE: (i) Repair cost is deemed to be included labour,transportation, balancing or alignment of core etc in the quoted rate; and Unserviceable items required to be replaced shall be measured and paid separately. (ii) The burnt transformer oil will be contractor property & new oil will be measured and paid separately under respective item. (iii) The coils and the oil shall be inspected for repair/replacement by department rep detailed by AGE E/M (iv) T&P and minor parts will be arranged by the contractor and the cost thereof shall be deemed to be included in the unit rate quoted against this item. (v) Rate of any type Rubberised cork / neoprine gasket and filtration of oil is included in the unit rate quoted above

Description all as per Item No 4.00 above but for 350 KVA to 400 KVA capacity complete all as specified and as directed.

Supply only new copper wire wound coils for LT / HT winding of transformers with super enameled copper winding wire of suitable gauge so as to match with the working capacity of transformer and all as per manufacturer’s design and specification including providing Class-E insulation and fixing HT / LT coils in position and connecting electrically in core assembly of capacity 63 to 630 KVA for replacement during repair of transformer complete all as specified and as directed.

Supply only HT porcelain bushing complete for 63 KVA to 160 KVA capacity with brass/tinned copper rod with nuts and gasket set complete all as specified and as directed.

Description all as per Item No 7.00 above but for 350 KVA to 400 KVA capacity complete all as specified and as directed.

Supply only LT porcelain bushing complete for 63 KVA to 160 KVA capacity with brass/tinned copper rod with nuts and gasket set complete all as specified and as directed.

Description all as per Item No 9.00 above but for 350 KVA to 400 KVA complete all as specified and as directed.