1. 没有进行适当的维护。

1. Not properly maintained.

2.湿气:如遇水淹、漏水、屋顶漏水、油箱及绝缘油有湿气，如水沿外壳或附件侵入。

2. Moisture: In case of water flooding, leakage, roof leakage, or moisture in the fuel tank and insulation oil, such as water invading along the shell or accessories.

3. 过载。变压器的过载是指变压器在多种运行条件下的超长时间。在电厂经常发生超载的情况下继续缓慢增加负荷，冷却装置不正常工作，变压器内部故障等，导致变压器超载运行。温度过高会导致绝缘老化，纸张强度降低后绝缘，变压器绝缘板过早老化。因此，外部故障的影响可能导致绝缘损坏，从而导致故障。

3. Overload. Overload of transformers refers to the prolonged operation of transformers under various operating conditions. Under the frequent occurrence of overloading in power plants, slow increase in load, abnormal operation of cooling devices, internal faults in transformers, etc., lead to transformer overload operation. Excessive temperature can cause insulation aging, resulting in a decrease in paper strength and premature aging of transformer insulation boards. Therefore, the impact of external faults may lead to insulation damage, resulting in faults.

4. 线的干扰。线路干扰是造成变压器事故的主要因素。主要包括过电压、低负荷时的峰值电压、线路故障、闪络等异常现象。这种故障在变压器故障中占很大比例。因此，应定期进行冲击保护试验，检测变压器的抗励磁电流强度。

4. Interference from wires. Line interference is the main factor causing transformer accidents. This mainly includes abnormal phenomena such as overvoltage, peak voltage at low loads, line faults, and flashover. This type of fault accounts for a large proportion of transformer failures. Therefore, regular impact protection tests should be conducted to detect the anti excitation current intensity of the transformer.