- DISTRIBUTION TRANSFORMER
- CURRENT TRANSFORMER
- POTENTIAL TRANSFORMER
- CIRCUIT BREAKER
- DIESEL GENERATOR
- MOTOR
- POWER CABLE
- BUS BAR
- PROTECTION RELAYS
- AUXILIARY RELAYS
- METERS
- EARTH PITS
DISTRIBUTION 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 (if oil mechanism)
- Hummming / any abnormal sound to 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
DIESEL GENERATOR
- Check visual inspection for abnormalities
- Check oil level
- Check fuel level
- Check battery charge
- Check and clean air cleaner
- Drain water from fuel tank
- Check drive belt tension
- Check starting batteries
- Change oil and filters
- Clean crankcase breather
- Check radiator hoses
- Clean cooling system & other parts
- Routine and special 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
MOTOR
- Visual Inspection
- Check for abnormalities
- Check brush gear and slip ring of motor
- Checking the air gap
- Ensure tightness of mounting system
- Check vibration
- Check healthiness of bearings
- Check starter control gear
- Bearing Maintenance
- Maintenance of cooling system
- Lubricate moving parts
- 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
POWER CABLE
- Checks healthiness of cable insulation
- Checks healthiness of fire coating on cable
- Ensure the tightness at end terminals of cable
- 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
BUS BAR
- Visual Inspection for healthiness
- Check any loose connection and arcing
- Carryout cleaning
- Ensure nut bolt tightness
- Replace 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
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
* 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 the healthiness of indication
- Clean the relay and contacts
- Ensure the terminal tightness
- Replace the faulty components
- Checks the healthiness of contacts
- 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