Rewinding and repairing of 25 KVA 11KV / 0.433 KV outdoor type oil cooled transformers for Hub/LO/HT Mobile BTS sites at MANIKAGADA, BAHADAJHOLA, TANGI, NAGAPUR AND PUBUSAHI with Repairing of Sub stations and replacement of faulty accessories under

Amount

Physical inspection of sites and Transformer Substation accessories, overhead lines, feeder panels, meter box etc. and checking and testing of Transformers and its associated accessories, switch gears and LT cables etc. after disconnection of the connections from HT and LT side of the Transformers with suitable testing instruments, detection of faults and list out of materials required / works to be carried out for restoration of power supply etc. complete as required. This will also include the conveyance of required skilled & unskilled man power, tools and tackles etc. as required.

For sites distance up to and including 50 KMs

For sites distance above 50 KM and up to and including 100 KMs

For sites distance above 100 KM and up to and including 150 KMs

Liaison and coordination with different units of the supply authority i.e. Division/Sub Division/Section offices/MRT office/E & MR office and field staff etc. for obtaining shut down of 11KV line, breaking of meter seal if required to carry out the repairing and maintenance works of the Sub Station and re-energisation, testing etc. as required.

To carry out minor repairing works such as pin/post insulators, jumper wires, LT side cable , LT side switch gears etc.

To carry out major repairing works such as rewinding/ replacement/ repairing & overhauling of Transformer, AB switch, DO fuse unit, replacement of HT cable and its end terminations or any other major repairing works of the DP structure & associated overhead lines.

Thorough servicing of AB Switch, adjustment of bearings, male/female contacts, lubricating of moving items i/c replacement of minor defective parts like nuts, bolts, clamps, wire braided copper strips and checking the functional operation, etc. as required.

Replacement of the following defective spare parts of the transformer substation by new one i/c fitting, connection etc. as reqd.

Male contact and Female contacts made of hard drawn copper for 200 Amps air break switch with wire braided strip etc. comprising of 3nos per set.

Rotor mechanism for 200 Amps air break switch.

Square/round bar for AB switch (Horizontal unit)

Operating Handle made of 25/32mm Medium class GI pipe with wire braided copper strip

Heavy duty operating pipe for air break switch i/c fabrication etc. as required.

Replacement of damaged breather for 25 KVA 11KV/0.433KV transformer by a new one with dry silica gel etc. as required.

Replacement of faulty/damaged pin insulators by new one of 11 KV grade pin type insulator with large steel head G.I. pin, nuts, washers on existing HT pole/ DP structure etc. complete as required.

Replacement of faulty / damaged disc insulators by new one of 11 KV, 45 KN porcelain disc insulator with galvanized insulator fittings, ball and socket type and complete with galvanized strain clamps, bolts, nuts, washers etc. as required.

Replacement of the faulty 11KV Post Insulator for 200Amps AB switches/ HG fuse units by new one of ISI marked i/c removal of faulty one and fixing the new one etc. as required.

Replacement of damaged and unserviceable AB switch by new one of 11 KV, off load, single break, triple pole, horizontal type, gang operated air break switch having 2 nos. 11 KV post type insulator per phase complete with galvanized channel iron base, arcing horns, 25 mm dia. 6mtr. long GI pipe, tinned copper wire braided flexible earthing wire & operating handle with locking arrangement etc. complete as required.

Dismantling of faulty and damaged AB switch from the DP structure i/c cutting the base channels/bolts etc. complete as required. (The dismantled faulty & damaged AB switch may be retained by the agency)

Supply & drawing of 55 sqmm. AAA conductor for overhead line and DP structures i/c binding with insulators etc. complete as required.

Dismantling the following ratings faulty transformer from the existing D.P. structure/Plinth & installation of standby/repaired transformer i/c testing and commissioning, recording the required parameters etc. by qualified staff, arranging required tools & plant with proper precautionary measures etc. as required.

25 KVA, 11KV/0.415KV, 50 Hz Aluminium/Copper wound oil cooled Transformer

Rewinding of the HT windings of the following ratings Oil immersed Distribution class Transformer with superior grade and suitable size Double paper covered Transformer winding conductor , providing re-insulation of LT winding etc. including dismantling the transformer parts i.e. conservator tank, terminal boxes, bushings, removing the core and windings from the tank, draining of transformer oil, cleaning of tank, reassembling the core & windings and all the aforesaid parts after rewinding/repairing, replacement of gaskets, worn out nuts, bolts and washers/cork washers etc, heating in heat chamber, carry out factory tests and submission of test reports etc. complete as required. (The dismantled aluminium winding and other materials can be retained by the agency and credit for the same to be given in the quoted rate of this item)

25 KVA, 11KV/0.415KV, 50 Hz Aluminium wound oil cooled Transformer

25 KVA, 11KV/0.415KV, 50 Hz Copper wound oil cooled Transformer

Repairing of 25/63 KVA Aluminium /copper wounded transformer at factory/workshop by dismantling the faulty transformer, re-insulating the windings, heating, reassembling i/c replacement of gaskets, nuts & bolts, washers, carry out factory tests etc. complete as required. (Rewinding of Transformer is not in the scope of this item)

Supplying and pouring of transformer oil (IS:325) of suitable make & grade for topping up/replacement of old deteriorated oil etc. complete as required.

Filtration and de-hydration of existing Transformer oil at factory / work shop ( In case of rewinding/repairing of Transformer at factory / workshop), testing of BDV and submission of oil testing report etc. as required.

Replacement of the following defective spare parts of the transformer by new one i/c fitting, connection etc. as reqd.

HV Bushings

LV Bushings

Painting of the transformer body with primer & two coats of weather proof synthetic enamel paints after scrapping the rust etc complete as reqd.

Making arrangements for inspection and testing of the re-winded transformer by the designated inspector of supply company at factory / workshop and obtaining test certificates and clearance for re-installation and energisation of the said transformer etc. complete as required.

Replacement of defective Lightening arrestors by new one of 3 phase, 11 KV Lightening arrestors complete with connection, testing i/c dismantling the old defective ones etc. complete as required. (One set comprising 3 units).

Rewiring of the DP structure of Transformer Sub Station with 55sqmm AAA /50sqmm insulated Al. conductor stranded cable with al. Lugs/sockets, binding with post insulators etc. complete as required.

Transportation of spare /new / repaired / standby 25/63 KVA transformer from BSNL office /factory /workshop to respective sites and faulty Transformer from sites to back by using suitable transportation medium including loading and unloading at both ends etc. complete as required. (The rate should be inclusive of toll gate fee/charges wherever applicable, nothing extra will be paid. Distance will be on shortest route only).

Distance up to and including 50 KMs (Charges for Up and Down)

Distance above 50 KM and up to and including 100 KMs (Charges for Up and Down)

Distance above 100 KM and up to and including 150 KMs (Charges for Up and Down)

M/S PRACHI ELECTRICALS