- POWER TRANSFORMER
- AUXILIARY TRANSFORMER
- CURRENT TRANSFORMER
- POTENTIAL TRANSFORMER
- CIRCUIT BREAKER
- ISOLATOR
- LIGHTING ARRESTER
- POWER CABLE
- PROTECTION RELAYS
- AUXILIARY RELAYS
- METERS
- EARTH PITS
POWER TRANSFORMER
- HT & LT Voltage and Current reading
- WTI & OTI Reading
- Oil level in conservator tank & OLTC tank
- Tap position & Tap changer counter reading
- PRV status & Buchholz relay status
- Condition of silica gel in breathers
- Cleanliness of transformer and accessories
- Visual leakage / seepage of oil
- Humming/any abnormal sound of transformer and accessories.
- Checking of OLTC mechanism Step by step
- Tightening of HV & LV connection
- Checking of gas collection in Buchholz relay & cleaning of glass cover
- Operation of tap changer from local and remote
- Condition check/replacement of silica gel
- Alarm/Tripping signal checking of OTI, WTI, Buchholz and PRV signal at panel.
- Testing of oil (BDV and Moisture content)
- Cleaning of Transformer
- Oil leakages checks for all joint & attend the leaks
- Inspection of CT JB and tightness the TB
- Inspection of transformer and replace the faulty components
- Testing of oil (DGA & IS-1866 characteristics)
- Painting of transformer (if peel off condition)
- Routine and special test on transformer
* Testing will be done using conventional test kits & special kits will be used where ever required * Routine Test Please refer respective slides in Preventive Maintenance
AUXILIARY TRANSFORMER
- HT & LT Voltage and Current reading
- WTI & OTI Reading
- Oil level in conservator tank & OLTC tank
- Tap position & Tap changer counter reading
- PRV status & Buchholz relay status
- Condition of silica gel in breathers
- Cleanliness of transformer and accessories
- Visual leakage / seepage of oil
- Humming/any abnormal sound of transformer and accessories
- Checking of OLTC mechanism Step by step
- Tightening of HV & LV connection
- Checking of gas collection in Buchholz relay & cleaning of glass cover
- Operation of tap changer from local and remote
- Condition check/replacement of silica gel
- Alarm/Tripping signal checking of OTI, WTI, Buchholz and PRV signal at panel
- Testing of oil (BDV and Moisture content)
- Cleaning of Transformer
- Oil leakages checks for all joint & attend the leaks
- Inspection of CT JB and tightness the TB
- Inspection of transformer and replace the faulty components
- Testing of oil (DGA & IS-1866 characteristics)
- Painting of transformer (if peel off condition)
- Routine and special test on transformer
* Testing will be done using conventional test kits & special kits will be used where ever required * Routine Test Please refer respective slides in Preventive Maintenance
CURRENT TRANSFORMER
- Oil level in tank
- Leakage / seepage of oil
- Humming/any abnormal sound of transformer.
- Oil level in tank
- Leakage / seepage of oil (if oil mechanism)
- Leakage of SF6 gas (if pressure drops)
- Checks the healthiness of local panel components
- Checks hotspot and conductor snapping in HV connections
- Cleaning & clamps connector tightness
- Oil leakages checks for all joint & attend the leaks
- Inspection local panel and tightness the TB
- Replace the faulty components
- Checks the local and remote operation
- Calibrate the relay
- Routine test on transformer
* Testing will be done using conventional test kits & special kits will be used where ever required * Routine Test Please refer respective slides in Preventive Maintenance
POTENTIAL TRANSFORMER
- Oil level in tank
- Leakage / seepage of oil
- Humming/any abnormal sound of transformer.
- Oil level in tank
- Leakage / seepage of oil (if oil mechanism)
- Leakage of SF6 gas (if pressure drops)
- Checks the healthiness of local panel components
- Checks hotspot and conductor snapping in HV connections
- Cleaning & clamps connector tightness
- Oil leakages checks for all joint & attend the leaks
- Inspection local panel and tightness the TB
- Replace the faulty components
- Checks the local and remote operation
- Calibrate the relay
- Routine test on transformer
* Testing will be done using conventional test kits & special kits will be used where ever required * Routine Test Please refer respective slides in Preventive Maintenance
CIRCUIT BREAKER
- Oil level in tank (if oil mechanism)
- SF6 gas pressure reading
- Oil pressure reading (if oil mechanism)
- Leakage / seepage of oil
- Healthiness of contactors
- Compressor run hour meter reading (if pneumatic mechanism)
- Oil level in tank
- Leakage / seepage of oil (if oil mechanism)
- Leakage of SF6 gas (if pressure drops)
- Checks the healthiness of local panel components
- Checks hotspot and conductor snapping in HV connections
- Checks cracks and damage in insulators
- Cleaning & clamps connector tightness
- Oil leakages checks for all joint & attend the leaks
- Inspection local panel and tightness the TB
- Replace the faulty components
- Checks the local and remote operation
- Calibrate the relay
- Routine test
* Testing will be done using conventional test kits & special kits will be used where ever required * Routine Test Please refer respective slides in Preventive Maintenance
ISOLATOR
- Checks the proper close/open contacts
- Checks the proper operation (close/open)
- Checks the healthiness of MOM box components
- Checks the healthiness operating motor
- Check the limit switch setting
- Checks hotspot and conductor snapping in HV connections
- Checks cracks and damage in insulators
- Cleaning & clamps connector tightness
- Inspection local panel and tightness the TB
- Replace the faulty components
- Checks the local and remote operation
- Motor Overload Relay Calibration
- Routine test
* Testing will be done using conventional test kits & special kits will be used where ever required * Routine Test Please refer respective slides in Preventive Maintenance
LIGHTING ARRESTER
- Checks counter reading
- Checks counter in green zone
- Checks the healthiness of grounding connection
- Checks counter reading
- Checks counter in green zone
- Checks hotspot and conductor snapping in HV connections
- Checks cracks and damage in insulators
- Measurement of leakage current
- Cleaning & clamps connector tightness
- Routine test
Digital IR Tester
* Testing will be done using conventional test kits & special kits will be used where ever required * Routine Test Please refer respective slides in Preventive Maintenance
POWER CABLE
- Checks healthiness of cable
- Ensure tightness at cable termination
- Routine and special test on cables
* Testing will be done using conventional test kits & special kits will be used where ever required * Routine Test Please refer respective slides in Preventive Maintenance
PROTECTION RELAYS ( NUMERICAL & ELECTRO MAGNETIC )
- Cleaning relay panel & avoid the entry from dust & moisture
- Checks abnormalities and sound
- Checks the healthiness of indication
- Clean the relay and contacts
- Ensure the terminal tightness
- Replace the faulty components
- Checks the healthiness of contacts
- Routine test
Secondary Injection 3 Phase Relay Test Kit
* Testing will be done using conventional test kits & special kits will be used where ever required * Routine Test Please refer respective slides in Preventive Maintenance
AUXILIARY RELAYS
- Cleaning relay panel & avoid the entry from dust & moisture
- Checks abnormalities and sound
- Checks meter reading for accuracy
- Checks the Calibration date
- Clean the relay and contacts
- Ensure the terminal tightness
- Replace the faulty components
- Routine test
* Testing will be done using conventional test kits & special kits will be used where ever required * Routine Test Please refer respective slides in Preventive Maintenance
METER (OFFLINE & ONLINE)
- Cleaning meter panel & avoid the entry from dust & moisture
- Checks abnormalities and sound
- Check meter reading for accuracy
- Checks the calibration date
- Clean the relay and contacts
- Ensure the terminal tightness
- Replace the faulty components
- Routine test
* Testing will be done using conventional test kits & special kits will be used where ever required * Routine Test Please refer respective slides in Preventive Maintenance
EARTH PIT / EARTH MAT
- Checks the healthiness of pit and contacts
- Clean the contact & replace the nut bolt if rust found
- Ensure the terminal tightness
- Replace the faulty components
- Add the charcoal, salt if required
- Measure resistance
* Testing will be done using conventional test kits & special kits will be used where ever required * Routine Test Please refer respective slides in Preventive Maintenance