To perform preventive testing for cable:
- cable 22kV, 3phase : 2 segments
- cable 7.2kV-22kV, 3phase : 9 segments

To perform Preventive Maintenance services for Transformer (type: 2500kVA 22/6.6kV, 2000kVA 6.6/0.4kV),  consist of following specific scope:
- General cleaning by vacuum cleaner & alcohol.
- Change the silicon gel if be necessary

- Check leakage of oil before shutdown
- Check insulation, overheating of cable at LV/HV sides
- Check and tighten all bushing and terminals at LV/HV sides
- Test insulation resistance of HV/Earth and HV/LV winding

- Oil sample testing (includes oil discharge testing)

To perform Preventive Maintenance services for Transformer (type: 800kVA & 300kVA, 6.6/0.4kV),  consist of following specific scope:

- General cleaning by vacuum cleaner & alcohol.

- Change the silicon gel if be necessary

- Check leakage of oil before shutdown

- Check insulation, overheating of cable at LV/HV sides

- Check and tighten all bushing and terminals at LV/HV sides

- Test insulation resistance of HV/Earth and HV/LV winding

- Change Oil leakage protection Roong for Transformer at Station D

- Oil sample testing (includes oil discharge testing)

To Perform Preventive Maintenance service for the MV stations, renew power cable, bushing and busbar
- 03 Gas circuit breaker 22kV (GCB)
- 01 MV metering panel (excludes test PT)
- 04 Loading breaker switches 22kV (LBS

To perform preventive testing for 03 nos of protection relay Sepam (Schneider)

To Perform Preventive Maintenance service of testing and commissioning endorsed by ATPsi for:
- 01 MV motor 600kW (insulation test)

- 01 LV motor 400kW ("")
- 02 LV motor 200kW ("")
- 02 LV motor 160kW ("")
- 01 LV motor 138kW ("")
- 07 LV motor 110kW ("")