Transformers play a vital role in production and everyday life, converting transmission voltages from the utility into distribution voltages suitable for use.
During operation, however, many subjective and objective factors affect the transformer and the power system as a whole. Regular transformer maintenance is therefore essential.
DONGANHMEE’s transformer repair, maintenance and testing services meet all of these needs.
DONGANHMEE technicians carrying out transformer maintenance
Transformer operating procedure:
- Inspect the transformer carefully before energizing
- Check thermometer readings and oil level
- Check tank earthing and look for oil leaks
- Check relays, switches and oil pipe valves…
- If the transformer meets all requirements, it can be energized and put into service.
Substation maintenance procedure:
- General survey, analysis and assessment of the transformer’s condition.
- Professional cleaning of the whole transformer.
- Periodic oil sample testing.
- Improving design and installation details to suit operating requirements.
- Topping up with the correct transformer oil when the oil level is low.
- Cleaning and re-torquing cable lugs and HV/LV cable joints.
- Measuring insulation resistance HV–tank, HV–LV and LV–tank.
- Cleaning the tank and bushings; checking primary and secondary cables.
- Checking oil temperature and controller operation.
- Advising on and reinforcing the substation foundation for stable operation.
- Checking AC/DC supplies; cleaning the control cabinet and the tap-changer circuit boards.
DONGANHMEE technicians repairing a transformer
