Preventive and Breakdown maintenance of Power Transformers and Generator auxiliaries installed in 5X200MW, BTPS, Obra.

Amount

Following works are to be carried out in connection with preventive and Breakdown maintenance of power & service transformers of 200MW units BTPS, Obra

Pre overhauling, centrifuging activities:

O/H & Centrifuging of 250/240MVA 400/15.75KV GT or 400/220/33kV ICT

O/H and centrifuging of 15MVA,15.75/6.9KV UAT:

O/H and internal inspection of OLTC of UAT, complete dismantling and reassembly:

O/H & centrifuging of 1.6MVA,6.6/0.4KV Service transformer:

Painting of 1.6MVA,6.9/0.4KV service transformer complete with radiator, conservator with one coat red oxide metal and two coat spray painting with smoke grey color acolyte enamel paint after thoroughly cleaning the surface of the equipments to be done as per procedure.(Approx. area of each transformer 175 square mtr.).

Pre centrifuging activities like shifting of C/F machine, hose pipe, power supply boards, filled & empty drums:

Centrifuging of 50MVAR, 400KV shunt reactor and attending oil leakage. ( Approx. 40 KL oil capacity)

Pre centrifuging activities like shifting of C/F machine, hose pipe, power supply boards, filled & empty drums:

Centrifuging of 30MVA Station transformer with OLTC:

Disconnection & Re-connection of terminal connectors at transformer bushings 315,250, 240MVA ICT,GT 30,20,10 MVA Station Transformer (per phase)

Centrifuging of transformer oil of TRANSFORMER / Oil tank

Arresting oil Leakage from radiators and associated pipe lines of the transformer

Checking of test plug and CT terminlas of HT Transformer ( all three phase & neutral)

Arresting oil Leakage from spindle bush of tap changer of GT / ICT

Arresting oil leakage from top / bottom inspection cover of the transformer or back inspection cover of bushing by even tightning of nuts & bolts and applyning M-seal etc. therafter.

Replacement of Expansion Bellows of UAT

Cleaning of LT side links of GT as per scope of work

Replacement of phase side seal off bushing of IP Bus duct at GT LV side

Dismantling and assembly of LV & Neutral bushing , LV turret etc. (proper replacement of gasket 'O' Ring)

Replacement of Pressure Relief Valve of HT Transformer

Replacment of Expansion Bellow of GT

Dismantling and Reinstalation of HT Bushing (single phase )

Preventive maintenance of GT, UATs, 15.75KV bus duct outside T.G.hall.

Replacement of all the 3 phases LV bushing gasket of UATs.

Replacement of HV bushing oil seals of UATs

Replacement of LV bushing oil seals of service transformers (UST, SST, ESP, AHP, WTP and CHP transformers):

250/240MVA,15.75/420KV GT

315/240MVA, 400/220/33KV ICT

1.6MVA, 6.9/0.4KV service transformer (UST,ESP,SST,CHP,AHP,WTP & stacker reclaimer transformer)

50MVAR shunt reactor & NGR

30MVA, 220KV/6.9KV station transformer

15MVA, 15.75/6.9KV UAT

Following works are to be carried out in connection with round the clock supervision & maintenance work of various power & service transformers of BTPS, Obra:

Round the clock supervision & maintenance of various power transformers and service transformers:

Routine maintenance of cooling fan of dry type transformers. For this job one skilled and one unskilled person must be depute for eight hours (10:00 AM to 18:00 PM) daily. If problem raised in other time of this slot , person has to made available by firm . If needed, more and efficient person must be deployed by firm to accomplish the job. If any problem rose in odd hours.

Breakdown maintenance of cooling fan of dry type transformer. If fan is not running, checking of electrical circuit and removing the fault as and when required. It also includes replacement of cables of fan as and when required

Replacement of OTI, WTI, relay, starter, coil, etc. On transformers. if any alteration needed in mounting of same , it has to be done by firm

Replacement of rubber pads and unbalanced fan blades in case of vibration as per requirement

Greasing , oiling of bearing of fan

Overhauling of fan motor. Which may include dismantling, cleaning, Replacement of bearing, greasing, oiling, adjustment, varnishing, assembling, etc of fan motor.

Following works are to be carried out on cooling fans, Dismantling of cooling fan from place of mounting on transformer, shifting to staff shed in 400KV S/Y, removing fan blade, fan guard, cleaning them, shifting the burnt motor to the workshop of bidder, rewinding, testing, assembly of fan guard, fan blade and installation on transformer if required of 5x200MW power transformer

750 Watt, 415V, 3 phase, 50 C/S.

1200 Watt, 415V, 3phase, 50 C/S.

Repair of damage slot portion of fan motors by staggering the core.(750 Watt motor).

Repair of damage slot portion of fan motors by staggering the core (1200 Watt motor.)

Repair of bearing housing of fan motor (750 Watt)

Repair of bearing housing of fan motor (1200 Watt.)

700W,3-phase,415V,50C/s

370W,3-phase,415V,50C/s

132 to 250W,3-phase,415V,50C/

Following works shall be carried out connection with Overhauling & preventive maintenance work of mulsifire installation, 400KV MCB panels, 400KV PLCC panel switchyard compressor panel, service transformer marshalling box etc. of 5X200MW BTPS Obra

Complete O/H of mulsifire system with deluge valve including water and air line

Painting of mulsifire pipe line with one coat red oxide and 2 coat apcolite synthetic enamel paint after thoroughly cleaning the surface of equipment with help of zero size emery paper etc. for complete removal of dust & rust (Approx. area 88 Sq.M.)

Preventive maintenance of MCB control and relay panels

Preventive maintenance of 400KV/220KV S/Y mulsifire compressor, GT mulsifire compressor control panels

Preventive maintenance of 400/220KV S/Y compressor control panels, motor J.B. bus bar chamber etc.

Preventive maintenance of marshalling boxes of 1.6MVA,6.6KV/0.4KV service transformers of WTP, Ash handling, Coal handling, SST, UST, ESP etc.

Preventive maintenance of 400KV transmission line PLCC control & relay panel

Following works shall be carried out connection with Preventive and Breakdown maintenance work in 15.75KV Bus duct, NGR and Stator water system of 5x200MW units of BTPS, Obra:

Preventive maintenance of expansion tank and its gauge glass:

Checking & attending abnormal H2 gas leakage in 5x200MW Generators and its associated piping’s and H2 gas coolers.

Preventive maintenance of 15.75KV bus duct inside T.G.hall:

Changing excitation polarity in all 5x200MW units:

Preventive maintenance of slip ring carbon brushes, brush holder, neutral grounding transformer and reactor in 5x200MW units:

Dismantling and replacement of brush rocker assembly of slip ring for testing of rotor and remounting:

Preventive maintenance of earthing transformer and neutral grounding reactors of 5X200MW Units.

Isolation of 15.75KV bus duct outside T.G. Hall from man hole near A-Axis wall for identification of stator E/F:

Preventive maintenance of seal oil filters, stator water filter, damper tank, hydraulic seal oil tank, ILI, expansion tank H2 & CO2 gas manifolds, H2 and seal oil pipe lines & valves,H2 gas driers etc.

Attending leakage of oil from AC/DC seal oil pumps including replacement of seal if required.

Preventive maintenance and greasing of bearings in A.C. seal oil pump in 5x200MW units:

Preventive maintenance & hydraulic testing of H2 gas coolers.

Preventive maintenance and hydraulic testing of seal oil coolers in 5x200MW units.

Decoupling, removal, remounting alignment and coupling of AC/DC seal oil pumps:

Preventive /Cleaning work of 15.75 KV duct at 4 meter.

Reconditioning of all six no. 15.75KV bus duct perplex containers in 5x200MW units.

H2 gas purging and re-charging

Monitoring and maintaining the level of hydraulic seal oil tank round the clock manually by opening and closing the adjacent valve after float valve in emergency.

Normalizing seal oil system and draining oil from Gen. casing and hydraulic seal oil tank round the clock in emergency.

Filling H2 gas cylinders in Generator casing of 5x200MW units to maintain H2 pressure in Gen. casing upto 3.0Kg/cm2 pressure or as per instruction of concerned AE/JE in running units.

Bus separation from generator of all the three phases / three neutrals, cleaning of seal off bushing and HV testing of buses and other works in attending stator earth fault of generator & their box up

Cleaning / Replacement of flexible links of phase / neutral side of generator terminal as per scope of work

Work on seal oil /stator water cooler of 200MW Unit as per scope of work

Replacement of defective Generator hydrogen gas cooler as per per scope of work

Replacement of defective float valve of Seal Oil Tank of as per scope of work

Replacement of defective float valve of expansion tank of as per scope of work

To & Fro transportation of filled and empty hydrogen gas and carbon-di- oxide gas cylinders in normal working hours including Sunday/Holiday from hydrogen generating plant/ stores of WTP/ Central stores ,A,TPS to the units of 5x200MW BTPS on normal working days including Sunday & holiday. NOTE: - Average 70 cylinders per day shall be transported

To & Fro transportation of more than 100 nos. filled & empty hydrogen gas and carbon-di-oxide gas cylinders in emergency (During odd hours) from hydrogen generating plant/ stores of WTP/ Central stores, ATPS to the units of 5x200MW BTPS.

Following works are to be carried out in connection with Preventive and Breakdown maintenance work of GT cooling control cabinets, PT cubicles ,stator water, seal oil and Gen. relay panels in 5X200MW, BTPS, Obra

Preventive maintenance of GT cooling control cabinet, UAT-A & B,MB etc.

Preventive maintenance of PT cubical:

Preventive maintenance of stator water panel.

Preventive maintenance of seal oil panel.

Preventive maintenance of Generator relay panel.

Work on SP Bus ducts of GT / UAT / Genreator

Breakdown maintenance of thyristor cooling fan / excitation transformer cooling fan

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M/S ACCURATE ENGINEERING