Annual Electrical Maintenance Works at CPP, HWP(M)

Amount

Preventive Maintenance of circuit breakers of following voltage level and type:

33 kV VCB

11 kV VCB

Preventive maintenance of 220kV Isolators

Preventive maintenance of 220kV switchyard bay marshalling box

Preventive maintenance of switchgear panel of following voltage level:

Preventive Maintenance of transformers of following rating:

220/33kV, 40MVA

33/11kV, 40MVA

33/6.6kV, 16MVA

11/6.6kV, 8MVA

Below 8MVA

Oil topup in transformers of following rating:

8MVA and above

8MVA and below

Replacement/Drying of Silica Gel of transformer

Arresting of oil leak from transformer of following rating:

220/33kV, 40MVA

33/11kV, 40MVA

33/6.6kV, 16MVA

11/6.6kV, 8MVA

Below 8MVA

Transformer oil sample collection and testing(for BDV) as per relevant Indian standard. BDV kit will be provided by department

Disconnection of power cables from transformer(rated 40 MVA) terminals(after opening terminal box cover) for the purpose of measuring of IR value and subsequent connection and closing of terminal boxes. Measurement of IR value covered in other item.

Disconnection of ground connection from transformer(rated 40 MVA) neutral terminals for the purpose of measuring of IR value and subsequent connection. Removal and reconnection of any other ground connections in the circuit are also covered in this item. Measurement of IR value covered in other item.

Disconnection of power cables from transformer(rated between 8MVA and 40MVA) terminals(after opening terminal box cover)/bus bar terminals for the purpose of measuring of IR value and subsequent connection and closing of terminal boxes. Measurement of IR value covered in other item

Disconnection of ground connections from transformer(rated between 8MVA and 40 MVA) neutral terminals for the purpose of measuring of IR value and subsequent connection. Removal and reconnection of any other ground connections in the circuit are also covered in this item. Measurement of IR value covered in other item.

Disconnection of power cables from transformer(rated 8 MVA and less) terminals(after opening terminal box cover) for the purpose of measuring of IR value and subsequent connection and closing of terminal boxes. Measurement of IR value covered in other item.

Disconnection of ground connections from transformer(rated 8MVA and less) neutral terminals for the purpose of measuring of IR value and subsequent connection. Removal and reconnection of any other ground connections in the circuit are also covered in this item. Measurement of IR value covered in other item.

Removal of existing Oil Temperature indicator/Winding temperature indicator of transformer and replacing it with spare by proper mounting. Connection and disconnection of indicator terminals from marshalling box is in the scope of contractor

Measurement of Insulation resistance value/ Polarisation index value of transformer winding/power cable/circuit breaker/bus bar/motor etc.

Measurement of dielectric disspitation factor/Capacitance value of insulations of 220kV CT/PT/transformer/OIP bushing

Troubleshooting of control/protective/power circuits of 220kV circuit breaker/ 220kV isolator/ 220/33kV 40MVA transformer/220kV CT/220kV PT etc.

Troubleshooting of control/protective/power circuits of 33kV switchgear/33kV breakers/33kV-11kV-6.6kV voltage level transformers etc.

Troubleshooting of control/protective/power circuits of 6.6kV-415V voltage level transformer/6.6kV motor etc.

Troubleshooting of control/protective/power circuits of 415V circuit breaker/ 415V transformer/ 415V switchgear/ 415V motor etc.

Troubleshooting of control/protective circuits of 220V DC/48V/24V DC system

Improvement of IR value to satisfactory value(as directed by EIC) of 33kV outgoing cubicle by hot air blowing/ heating with luminaires etc.

Improvement of IR value of 415V motor to satisfactory value(as directed by EIC) by hot air blowing in terminal box/ heating with luminaires etc.

Preventive Maintenance of HT motor

Condition monitoring of HT motor

Improvement of IR value of 6.6kV motor to satisfactory value(as directed by EIC) by hot air blowing in terminal box/ heating with lumiaires etc.

Preventive Maintenance of LT motor and its module

Condition monitoring of LT motor

Temporary power supply connection / disconnection at different location (material collection from plant store and safe return to plant in contractor scope)

Condition monitoring of LT module

Shifting of CTs/PTs/LT motors/Control transformers/testing kits etc. from DPS store/E-U store to site/site to store when required

Removal of connection of 220KV overhead conductors from OIP bushings for testing of bushings and re-termination after completion of testing

Pre-monsoon checks of transformers as per checklist

Disconnection of cables from motors/overhead lines/TBs etc. for troubleshooting etc. and reconnecting after completion of troubleshooting

Supply of paint and painting of the surface of cable tray/panel/motor/exhaust fan etc. Minimum quantity of synthetic enamel smoke grey paint to be supplied: 15 litres

Preparation of various documents in system as per technical specifications

Supply of 1.5V AA cells as and when required, Make: Duracell

Supply of 9V cells as and when required, Make: Duracell

Puncture Repair of cargo loader tyre as and when required as per technical specifications

Installation of quarter turn locks(Zinc die casting body, steel cam, chrome plating) including supply of lock with key for electrical panel of following dimensions:Panel cut-out:22mm dia.(approx.) as per sample. Grip length upto 100mm as per sample.

De-dusting of modules/panels, Segregation of spares/scrap in section stores etc.

Fabrication, painting(one coat each of red oxide and synthetic enamel grey) of support angles/transformer control cabinet canopy/cable tray canopy/neutral grounding resistor enclosure etc. including supply, cutting, welding of MS sheet/plate/angle of required thickness, required GI nuts, bolts, plain and spring washers and fixing at site as per technical specifications. Supply of red oxide and synthetic enamel grey paint is also in the scope of contractor