电力设备常见内部故障从统计的数据情况来看,各种外部故障占故障总数的百分比超过90%,而内部故障所占比例不足5%。因此,从数量上讲,外部故障远远大于内部故障。然而.从故障可能造成的危害和损失来看,内部故障远大于外部故障。例如,由于主变套管缺油或内部受潮。可能导致放电而造成套管爆炸,甚至使主变本体也遭受严重损坏。其破坏性几百倍甚至几千倍于线夹过热而烧断这一类外部故障。电力设备内部热缺陷主要包括:发电机封闭母 Common Internal Faults of Power Equipment From the statistical data, all kinds of external faults account for more than 90% of the total number of faults, while the proportion of internal faults is less than 5%. So, quantitatively, the external fault is much larger than the internal fault. However, from the hazards and losses that may be caused by the fault, the internal fault is much larger than the external fault. For example, due to a lack of oil in the main bushing or internal moisture. May cause the casing to explode due to discharge and even cause the main transformer body to suffer serious damage. Its destructive hundreds or even thousands of times more than the clip overheating and burn this type of external fault. Thermal defects in power equipment include: generator closed mother