Transformer Testing and Maintenance
Most faults in a power transformer show signs that oil analysis can catch early.
Once a Year
Recommended Interval
≥ 30 kV
Oil Dielectric Strength Threshold
What the oil reveals
A sample taken from the transformer oil is examined through dissolved gas analysis (DGA); the ratio of hydrogen, acetylene and methane helps distinguish between different fault types.
The turns ratio test reveals whether there is a short circuit between windings, while insulation resistance measurement shows the condition of the winding-to-ground insulation.
What's Included
- Dissolved gas analysis (DGA)
- Turns ratio test
- Insulation resistance measurement
- Buchholz relay function test
- Oil level and leak inspection
- Cooling system maintenance
| Finding | Likely Cause | Action |
|---|---|---|
| Rise in dissolved gas | Internal fault, overheating | Increase sampling frequency |
| Thermal temperature difference | Loose connection | Retighten connection, check torque |
| Tap changer wear | Frequent tap changes | Schedule early maintenance |
Standards We Apply
TS EN 60076
Power transformer test standard
TS EN 61557
Measurement equipment calibration
The Buchholz relay mechanically detects gas buildup or a sudden oil surge inside the transformer and issues an alarm or trip signal.
Frequently Asked Questions
How often should oil analysis be performed?
It depends on the transformer's age and loading, but once a year is generally recommended, and the interval can be shortened for critical facilities.
What kinds of faults does dissolved gas analysis reveal?
It distinguishes between fault types such as overheating, partial discharge and arcing based on the ratio of gas components.
Why is the Buchholz relay tested?
It issues an alarm or trip signal when gas builds up or oil flow becomes abnormal inside the transformer, which is why it undergoes regular function testing.
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