Causes of fire in electrical equipment

Most of the insulating materials in electrical equipment are made of flammable materials in varying degrees. For example, oil switches, insulating oil in transformers, paper, rubber, paint, insulation sheath of various insulating objects and cable insulation parts, and wood and plastics of various switchboard frame shells are all flammable. These flammable substances all have a certain rated temperature requirement. If the temperature of the electrical equipment exceeds its limit during operation, what is the reason for the high temperature that may cause a fire to confuse the temperature? It is often caused by various electrical accidents. For example, for low-voltage lines, they are widely distributed in various power consumption units and are the main equipments for transmitting electric energy. During operation, when the power supply is restored due to line maintenance, the wrong line is detected when the power supply is restored or the line is not monitored and monitored, resulting in a short circuit. , Fuse is too large to cause heating or improper operation and maintenance, resulting in damage to the insulation of electrical equipment and lines or aging of insulation, etc., and sparks or arcs causing overheating and fire. In the operation of the motor, due to neglect of safety, failure to abide by the operating procedures and maintenance of the equipment is not enough, resulting in brush spark, excessive contact resistance, bearing overheating or severe overload, resulting in a short circuit or earthing between the daytime and phase, phase-running operation , Open-type motor inhalation of fiber county, too much dust, blocking the air duct, poor contact terminals, high temperature and other resistance can cause fire.

At the same time, the poor quality of transformer insulation oil, leakage of oil leakage, water leakage of casing, long-term overload heating of windings, and short-circuits between the layers, are also important factors in the occurrence of fire.