1) Check the load of the transformer and the temperature of the cooling medium, and check it with the oil temperature that should be under the same load and temperature of the cooling medium.
2) Check the correctness of the calibration thermometer.
3) Check the ventilation of the transformer cooling device or the transformer room. If the temperature rise is due to the failure of the cooling system and cannot be repaired during operation, immediately stop the transformer for repair. If there is no need to stop for repairs (such as partial fan failure of oil-immersed air-cooled transformer, partial cooler failure of forced oil circulation transformer, etc.), the personnel on duty should adjust the load of the transformer to the corresponding capacity according to the relevant provisions of the regulations. . If the oil temperature is found to be more than 10℃ higher than usual under the same load and cooling temperature, or the transformer load remains unchanged, the oil temperature continues to rise, and the inspection results prove that the cooling device is normal, the transformer room is well ventilated, and the thermometer is normal, then the transformer is considered to have occurred Internal failure (such as iron core short circuit, winding turn short circuit, etc.), and the protection device of the transformer does not work for some reason. In this case, the transformer should be deactivated immediately.
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