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。

Because there are a lot of combustible transformer oil in oil-immersed transformer, paper and veil are also used as insulation materials for coils and lead wires, while wood block and cardboard are used as xieliaoji.89ix.comshuzhiwaw.89ix.comshusongji.89ix.comshusongjiw.89ix.comwanquji.89ix.comgubin

longw.89ix.comsupport and liner for iron core insulation. These are combustible materials, together with some factors in the process of equipment manufacture and operation, and the following situations are difficult to completely avoid, the danger of transformer fire and explosion Sex cannot be eradicated. Therefore, besides improving the manufacturing quality and operation level of transformers and reducing the potential fire hazards, it is also necessary to strengthen and improve the protection of transformers to prevent or reduce the losses and hazards caused by transformer fires.

2.1线圈绝缘损坏造成短路，使线圈发热燃烧；
2.1 The insulation damage of the coil causes short circuit, which makes the coil heated and burned.
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 occurs when the internal conductive connection contacts badly. When loosening or disconnecting, the arc will cause explosion and fire.
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 High-pressure bushing is damaged, burst and ignited. The bushing leaks, seeps oil or accumulates grease scale for a long time, and flashover or insulation layer of bushing is damaged and aged. Insulation breakdown causes explosion and ignition.
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 transformer oil results in the breakdown of inner circuit and the explosion and ignition accident.