General transformer protection check items are as follows: 1, whether the transformer is still design, installation shortcomings; 2, check the transformer load current, operating voltage is normal; 3, check whether the transformer oil leakage scene, the oil level, oil color and temperature of the oil-immersed self-cooled transformer are below 85 °c, the strong oil air-cooled transformer and the strong oil water-cooled transformer should be below 75 °C. 4, check whether the high and low voltage porcelain bushing of the transformer is clean, there are no cracks, damage and signs of flashover discharge; 5, check the wiring terminal of the transformer is not in good contact, overheating scene; 6, check the operation of the transformer sound is normal; normal operation when there is a uniform humming electromagnetic sound, if there is a crackling sound may be the breakdown of the winding insulation, such as the presence of uneven electromagnetic sound, may be the core of the bolt or nut has loosened. Check to see if the transformer is saturated with hygroscopic; 8. Check to see if the oil cutoff doors for the transformer are working properly, and if the cutoff doors for the gas relay and the radiator are open; 9, check the transformer explosion-proof tube barrier is not intact, barrier glass is not carved with a "Ten" word; 10, check the transformer cooling equipment is working properly, whether the heat pipe temperature is uniform, there is no oil pipe blocking scene; 11, check whether the transformer Shell earthing is outstanding; 12, check whether the gas relay is filled with oil, there is no gas; 13, outdoor transformers, the main point to check whether the foundation is outstanding, there is no foundation to sink, to the transformer pole, check the pole is not strong, wooden pole, pole roots have pedantic scene. 14, the indoor transformer, the key point to check whether the doors and windows are intact, check the shutter wire gauze is intact;
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