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在煤矿中烧坏电动机是造成经济损失较大的机电事故之一。据调查,工作面烧一台电机影响生产,轻者半班,甚至有影响两班的。据有关资料介绍,全国煤炭系统一年平均烧电机约1万5千台,仅修理费就需近7百万元。如果再计及影响出煤所造成的经济损失,那就更为可观了。从烧电机的场所来看,地面烧的少,井下烧的多(占90％以上),固定的井下设备烧的少,采区输送机用的电机烧的多(占井下的85％)。从所烧电机绕组来看,有的是匝间,有的是两相,有的是三相,有的是由接地引起的相间烧毁。造成烧毁的主要原因是电机长时间过负荷,温度升高,绝缘损坏而引起的匝间短路、接地等故障。电机寿命与电机实际温升的高低有直接关系。电机在运行中长期超过允许温升,电机寿
Burning a motor in a coal mine is one of the major electrical and mechanical accidents that caused economic losses. According to the survey, the work surface burning a motor affect production, the light half-time, and even affect the two classes. According to relevant information, the average coal burning system in the whole country is about 15,000 units a year. Only the repair cost is nearly 7 million yuan. If you re-calculate the economic impact caused by the coal, it is even more impressive. Burning motor from the point of view, the ground less burned, downhole burning more (accounting for more than 90%), fixed underground equipment less burned, mining area conveyor motor burning (accounting for 85%). From the burning motor winding point of view, some are inter-turn, some are two-phase, some are three-phase, and some are caused by the ground phase destroyed. Caused by the main cause of burning is a long motor overload, temperature rise, insulation damage caused by turn to turn short circuit, ground fault. Motor life and the actual temperature rise of the motor has a direct relationship. Motor over the long run in the allowable temperature rise, motor life