- Winding faultsShort circuit, open circuit, insulation aging, moisture breakdown.
- Core faultsMulti-point earthing of core, insulation damage of silicon steel sheets, overheating caused by eddy current.
- Tap changer faultsPoor contact, discharge ablation, voltage regulation failure.
- Insulation oil faultsOil deterioration, moisture absorption, gas content increase, reduced insulation performance.
- Oil leakageOil leakage caused by aging flanges, welds or gaskets.
- Bushing faultsFlashover, cracking, surface pollution discharge.
- Protection device abnormalitiesMalfunction of gas relay, failure of pressure relief valve, temperature measurement error.
- Overheating and abnormal noiseLocal overheating, loose core, discharge noise.
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