SE/GTS/OT-10/2024-25

Amount

Electrical Maintenance - II Section

I.Preventive Maintenance Works

Maintenance of carbon brushes /Replacement of worn out carbon brushes in Unit III/ Unit IV Generator shaft Earthing & Rotor E/F sensing carbon brush.

Works in 110KV Breakers /Generator Transformers/ Battery Chargers /Diode Voltage Regulator panel.

Works in Station Transformers.

Works in Station battery /Unit-III & IV Generator protection,AVR Control & CO2 protection battery/Unit I/II/III/IV battery/CC battery/D.G set battery

Works in CT/ PT/ CVT/ LAs/ Isolators

Works in Earth Switch

Works on Connectors / Fittings in 110KV Buses,Generator Transformers, Generator Breakers & All Feeder Breakers.

Works in Station Battery DCDB Module

II.Routine Maintenance Works

Calibration of Protection relays (Generator / 11KV SWGR / 415V LT SWGR / Unit III & IV 415V MCC / FWPH).

Calibration of Power Relays (Generator / 415V LT SWGR)

Servicing of MCC modules and calibration of Meters.

Testing of station transformer / Generator transformer / WTI / OTI / UAT/AC Exciter and permanent magnet generator/ D.G set alternator power circuit / Breaker contact resistance/ AVR panel / LT & HT Breaker circuits.

Winding Resistance and IR value of Generator Transformers/IR value of 11KV Bus duct & LT Busduct / IR value of Generator stator.

Checking of Diode wheel in Exciter for Unit I to IV / Testing of Switch yard interlock circuits.

Testing of Unit I to IV Generator space heater and panel heater / Terminal tightness of 110KV SWYD equipment boxes.

Terminal tightness and cleaning of control panels (CCR/11KV SWGR /LT SWGR /SCR /FWPH/CVT)

Servicing of Station (52AS) & UAT (52AR) Breakers / Terminal tightness of change over circuit/ MCC modules/ GT protection panel/ GT Marshalling boxes.

Servicing of 415V LT & 11KV HT Breakers, and testing Auto/Manual circuits

Terminal tightness of RTCC Panel / OLTC panel / draw out type CT/PT of GAC / DG set control panel.

Cleaning of Cable Gallery trays etc.

Cleaning / Terminal tightness of AVR Panel of Unit I to IV.

Testing of IR value, BDV oil test, silica gel replacing works in Generator Transformer/ Station transformer

Collecting & sending of oil samples from Generator Transformer & Station Transformer to R&D lab for DGA test & BDV test

Generator Transformer OLTC gear box mechanism and Tap Position Indicator mechanism servicing work.

110KV Breaker open/close time testing works.

Calibration of pr.gauge/pr.switch/Meters

Assist the R&D team for Generator Transformer Tan Delta test

Earth pit cleaning, tightening of earth contacts and resistance value measuring.

Conduting Load test on 125 Volt and 220 Volt Battery set.

III.Breakdown and General Works

Checking of control circuits and replacing the defective contactors in Unit I to IV MCC modules/ GT Marshalling box / control panels / 415V SWGR / RTCC /OLTC panels / SCR, AVR panels.

Checking of protection circuits and replacing the defective relays / Timers after testing in Unit I to IV panels/ GT Marshalling box/ 415V SWGR/ SCR, SCB and AVR panels/ Synchronising Trolley

Testing of control / Indication / Annunciation circuits and replacing the defective control switches/ push button/ Hooters/lamp holders in Unit I to IV MCC modules/ GT Marshalling box/ HT SWGR/ 415V SWGR/ RTCC / OLTC panels.

Testing and replacing the defective Annunciation bulbs / indicating bulbs in various panels of Unit I toIV MCC modules/ GT Marshalling box/ control panels/ 415V SWGR/ RTCC panels and etc.,

Testing and replacing the defective AVR panel cards / Annunciation cards of Unit 1 to IV

Rectification of DC cable fault. (Unit I to IV/ 11 KV SWGR/ FWPH/ DG Set/ RTCC/OLTC / AVR Panels / 110 KV switch yard.)

Attending to defect in HT Breakers/ LT Breakers / FWPH breaker / DG Set Starting Motor

Testing of 110 KV CT & PT/Generator Transformer.

Testing of LT CT & PT and control Transformer.

Testing of Unit 52AS and 52AR LT Breaker and its change over circuits.

Replacement work of Limit Switch/Pressure Switch /Pressure Gauge/Spring Charging Motor/Carbon Brush in spring charging motor .

Replacement work of defective trip coil / Close coil / Control contactor of 110KV Breaker / Cooler fan / OTI / WTI and bearing replacement in cooler fan of Generator Transformer/Topping up of SF6 gas.

Replacement work of defective oil pump/OLTC motor in Gen.Transformer/OLTC gear box worn out bearing changing.

Replacement work of defective contactor / Relays / timers and Oil line Valve leak attending works

Replacement work of defective battery/Battery connector,relays,Timer,Thyistor,condenser/Choke/ Transformer/PCB/Meter/Switches in Battery charger.

Replacement work of defective Moving contact/Fixed contact of isolator or Earth switch with spare one/Mechanism stud / Limit switch / Isolator motor / Contactor/Castle key/Interlocks in Isolator MOM box.

Topping up of Transformer oil with filtering arrangements including rental and transporting charges of filter machine.

Replacement work of defective ‘T’ clamps / Breaker clamps/ P.G. clamp / Switch end clamp /CT clamp / PT clamp .

Replacement work of defective conductor in Main Buses & Strung buses.

Replacement work of defective conductor interconnecting the CT, Isolator & Breakers.

Painting of MOM box/ marshalling box/ CT, PT, earth switch box and other panels etc..

Cable laying work.

110KV CT / PT oil leak attending work by replacing the worn out ‘O’ rings , gaskets and topping up of transformer oil & Nitrogen gas

Handling of materials at site/stores of weight above 150 Kg

Handling of materials at site/stores of weight between 100 & 150 Kg

Handling of materials at site/stores of weight upto 100 Kg

Electrical Maintenance - I Section

I. Frequently Operating Works

Works in Batteries and Battery Charger in Control Panels.

Works in Control Panel for CO2 Fire Fighting System in Unit I to IV.

Cleaning of all Field Instruments like Gauges, Switches, Indicators, Speed Pick-ups, Solenoid Valves, Scanners, Spark Plugs, Vibration Sensors and Smoke Detectors in Unit I to IV and Auxiliaries.

Cleaning of Cards in Mark-IV of Unit I to IV.

Carrying out works in Mark- IV of Unit I to IV such as cleaning, checking and allied modules works.

Terminal tightness checking in Junction Boxes and Modules, Ignition Transformers in Unit I to IV and Auxiliaries.

Works in Intercom Instruments, Intercom Exchange Cards, Junction Boxes healthiness checking.

Works in Page & Party System in the plant includes Instruments, Junction Boxes healthiness checking and checking the healthiness of all lines.

Works in CCTV System in the plant includes Cameras, Junction Boxes healthiness checking and checking the healthiness of all lines, Displays & DVRs.

Carrying out works in field instruments such as Pressure gauges & Switches for any leakage of oil, air, water & fuel and checking readings for correctness and analysis if necessary and attending the defects noticed if any.

Cleaning, Checking the terminal tightness in Lighting Distribution boards and pillar boxes.

Cleaning, Checking the terminal tightness of street light pole junction boxes.

Cleaning, Checking terminal tightness in junction boxes of Switchyard tower light fittings and High mast tower lights.

Checking the healthiness of motor terminal blocks, terminal lugs, power fuses, power contactors and end bearing noise of Unit I to IV and Auxiliaries Motors and Modules.

Taking Energy Meter reading

Carrying out works in field instruments such as flow meters, level indicators & switches, Temperature gauges & switches for any leakage of oil, air, water & fuel and checking readings for correctness and analysis if necessary and attending the defects noticed if any.

II. Rarely Operating Works

Checking the healthiness of RTD’s for Generator Winding Temperatures & indicator in Unit I to IV and related panel.

Works in Control Panel in Inlet Air Filter of Unit I to IV and Auxiliaries Panels related to C&I Control panels.

Calibration of Pressure Gauges, Differential Pressure Gauges & Temperature Gauges of Units I to IV and Auxiliaries.

Calibration of Pressure Switches, Differential Pressure Switches, Temperature Switches, Transducers, Digital indicators of Units I to IV and Auxiliaries.

Testing of Flame Scanners, Spark Plugs, Level Switches, Limit Switches, Level indicators, Pick- ups, Vibration Sensor, Naphtha Sensors, Smoke Detectors and Fire Detectors in Unit I to IV and Auxiliaries.

Testing of Solenoid Coil and Solenoid Valves, Air Diaphragm Valves in Unit I to IV and Auxiliaries. System.

Loop checking the alarms in Mark-IV of Unit I to IV by simulating the necessary parameters.

Cleaning, Checking terminal tightness and maintenance works in Distribution transformer and Lighting transformer.

Lubrication of motors by applying grease, testing of IR value, DC resistance of motor windings, load current measurement, Base bolt tightness of Unit I to IV and Auxiliaries Motors.

Cleaning, checking of tightness, testing of IR value in LT Bus bars.

Cleaning of Tube light fitting provided in entire locations of BBGTPS

Checking Earthing connection in Motors, Transformers and Modules, etc.

III. Breakdown /General Works

Releasing of old control cable and telephone cable above 4-pair & laying of new cable in a trench/ by clamping / by digging the earth in unit I & IV and Auxiliary locations.

Releasing of old telephone & CCTV cable 4-pair and below, laying of new cable in trench / by clamping / by digging the earth in intercom system.

Replacement of Thermocouple in Unit I to IV.

Intercom Fault & CCTV Fault attending work (including line and junction box faults rectification).

Page & Party Fault Attending work (line and junction box faults rectification).

Mark-IV Cards Replacement in Unit I to IV.

Impulse Line leak attending work by changing the ferrules and tightening in Unit I to IV and Auxiliaries.

Impulse Line re-tubing work in Unit I to IV and Auxiliaries.

Removing any Faulty C&I field instruments and calibrating / testing in Unit I to IV and Auxiliaries and Re-fixing the instruments in the system.

Releasing the batteries, Transporting it to battery shop, servicing, re-charging and bring back to site and re-fixing batteries for Control panels.

Defect rectification in Control Panels related to Unit I to IV and Auxiliary location panels.

Defect rectification work in Mark-IV Panels of Unit I to IV.

Painting of Control Panels, junction boxes, modules in Unit I to IV and Auxiliary location motors and field instruments.

Handling of Materials to the work spot up to 100 Kg

Handling of Materials to the work spot up from 100 Kg to 150 kg.

Releasing of Instruments during shut down or for Mechanical work and fixing the same after completion.

Testing of new materials /equipments.

IV.Releasing the failed motor (i.e.) decoupling from the air duct / pump, etc. for bearing replacement / rewinding and re-fixing the healthy motor after bearing replacement / rewinding.

For 55 kW, 45 kW and 37 kW (AOP) capacity motors.

Unit III & IV 88TK motor (37 kW) and 8kW EOP motor (DC) of Unit I & II.

For 30 kW, 26 kW, 22 kW, 18.5 kW and 15 kW capacity motors.

For 11 kW, 10 kW, 9.3 kW, 8 kW, 7.5 kW, 5.5 kW, 5 kW, 3.7 kW and 2.2 kW capacity motors.

For 1.5 kW, 1.1 kW, 1 kW, 0.75 kW, 0.55kW, 0.37 kW capacity motors.

LT cable fault

IV.LT cable laying work: Removing, Re-laying in cable trench / by clamping / or by Digging 0.6 Meters on the earth.

Power cable laying upto 25 sq.mm.

Power cable laying above 25 sq.mm. to 120 sq.mm.

Attending to the defect in Motors and modules (Power Circuit) of Unit I to IV and Auxiliary location motors.

Replacement of tube light bulb, choke, starter, MCB and attending to defects in Stabilizer, fan at various locations.

Rectification of Switch Yard tower lights, Unit I to IV Air craft warning lights, Flame proof fittings and Street light fittings.

New Wiring for Wall Mounted Tube Light, Fan points, plug points, street light fittings, etc.

Extension of Power supply for lighting, welding, drilling, grinding, etc. for other agency.

Replacing of worn out Earthing connection in Equipments / Motors.

Testing of New lighting materials, power contactors, etc.

Attending to the defect in Distribution Transformer and Lighting transformer.

Mechanical Maintenance - I Section

Cleaning of Accessory compartments

Cleaning of Turbine compartments

Cleaning of Load Gear & Exciter Compartments

Cleaning works in GT auxiliaries

Cleaning of outer areas of GTs

Cleaning the outside surfaces of drain tanks

Turbine lube oil top up

Lubrication in GT auxiliaries

Emptying the lube oil drain tank in units 1 / 2

Emptying fuel from units 1 / 2 drain tanks and moving, filling up this fuel into unit-3 drain tank

Grease/oil Lubrication of valves

Flex seal checking & bolts tightening

Removing guard for inspection of the starting clutch and refixing

Cooling water makeup work in GTs

Removing manhole door of inlet air/exhaust ducts for inspection and re-fixing

Maintenance works for 2 hours period

Maintenance works for 4 hours period

Maintenance works for one day period

Inlet air filters cleaning works units I / II

Inlet air filters cleaning works units III / IV

Cooling water radiator cleaning with air/water in GT unit

Removal of Fuel check valves/Water Injection Check Valves for checking and refixing

Removal of Fuel Nozzle assemblies, cleaning and refixing

Removal of Generator Air Filters, cleaning and refixing

Cleaning/Replacement of lube oil filter / lube oil in Diesel Engines

Cleaning/Replacement of Fuel filters/Air Filters in Diesel Engines

Rectification works involving Gas Cutting / Welding

Cleaning & Painting pipelines/equipment at ground level per Sq.m

Cleaning & Painting pipelines/equipment above ground level per Sq.m

Handling of materials at site/store of weight above 150 Kg

Handling of materials at site/store of weight between 101 to 150 kg

Handling of materials at site/store of weight upto 100kg

Moving and installing mobile pump for dewatering

R.O Cum D.M plant filters cleaning

SUDHA ELECTRICAL SERVICE (BID ID -1106024)