POWER TRANSFORMER OVERHAULING
Overhauling of a transformer is a comprehensive process which is done in 10-12 years.
Key Overhauling Activities
- Oil Filtration: Removes moisture, gases, and contaminants that degrade insulation.
- Internal/External Cleaning: Removes dust and sludge from cooling fans and the tank.
- Gasket Replacement: Stops oil leaks, preventing moisture ingress.Oil cooled transformers after a few years need complete service like replacement of all gaskets i.e valves, main tank, conservator, bushing LV, HV, inspection windows, radiators etc.
- Testing: Involves insulation resistance (IR) measurement, turns ratio tests, and TAN delta tests to ensure proper insulation and electrical performance.
Key Benefits of Transformer Overhauling
- Significant Life Extension: Overhauling, which includes cleaning, drying, and replacing worn parts, can extend the operational life of a transformer by roughly 10 years.
- Increased Reliability & Reduced Downtime: Proactive servicing, including oil filtration and insulation testing, minimizes unexpected breakdowns.
- Enhanced Efficiency & Power Quality: By cleaning cooling fins and repairing cooling systems, transformers run cooler and more efficiently, reducing energy losses.
- Cost Savings: Regular overhauling prevents major, costly repairs or the need for expensive, complete transformer replacements.
- Improved Safety: Overhauling reduces risks like fire hazards and insulation failure, enhancing the safety of the surrounding infrastructure.
- Technical Optimization: Processes like tightening the core and coil assembly and checking bushings ensure the transformer operates at its rated capacity.
