变压器起火主要原因
Main causes of transformer fire
由于油浸式变压器内部存有大量的可燃变压器油，线圈、引线也使用纸、面纱等作绝缘材料，铁芯绝缘则主要由木块、纸板作支架和衬垫，这些都是可燃材料，再加上设备制造和运行过程中的一些因素，以及以下几种情况难以彻底避免，其变压器起火和爆炸的危险性无法根除。因此，除了提高变压器制造质量及运行水平，减少火灾隐患外，同时还有必要加强和改进对变压器的保护，以防止或减少变压器火灾带来的损失和危害。
As there is a large amount of combustible transformer oil in the oil immersed transformer, paper and veil are also used as insulation materials for coils and leads, while wood block and cardboard are mainly used as support and pad for core insulation, which are combustible materials. In addition, some factors in the process of equipment manufacturing and operation, as well as the following conditions are difficult to avoid completely, the risk of fire and explosion of the transformer Sex cannot be eradicated. Therefore, in addition to improving the manufacturing quality and operation level of the transformer and reducing the fire hazards, it is necessary to strengthen and improve the protection of the transformer to prevent or reduce the losses and hazards caused by the transformer fire.
2.1线圈绝缘损坏造成短路，使线圈发热燃烧；
2.1 the coil insulation is damaged, resulting in short circuit and heating and burning of the coil;
2.2内部导电连接处接触不良产生高温，在松动或断开时，产生电弧造成爆炸起火；
2.2 high temperature is generated due to poor contact of internal conductive connection, and explosion and fire are caused by electric arc when it is loose or disconnected;
2.3高压套管损坏爆裂起火，套管发生漏水、渗油或长期积满油垢而闪络或套管绝缘层损坏、老化，绝缘击穿引起爆炸起火；
2.3 the high-voltage casing is damaged, burst and ignited, the casing is subject to water leakage, oil leakage or long-term oil scale accumulation, and flashover, or the insulation layer of the casing is damaged and aged, and the insulation breakdown causes explosion and fire;
2.4变压器油老化变质引起内络击穿而造成爆炸着火事故。
2.4 the aging and deterioration of the transformer oil causes the breakdown of the internal winding and causes the explosion and fire accident.