1. When the high-voltage system fails or is struck by lightning, system overvoltage will occur, which will lead to power failure.

2. When a device such as voltage transformer, current transformer, transformer, air switch, cable, etc. Long-term overload, short-circuit failure of the equipment itself, and poor contact at the connection end will lead to aging of the insulation of the above electrical equipment and self-heating, which will cause electrical fire, and in severe cases, explosion of the voltage device, lightning arrester and capacitor.

3. If the secondary grounding of the high-voltage system is poor, it will cause high voltage in the secondary equipment, which will threaten personal safety and cause electric shock accidents.

Second, the scene emergency measures

When the power distribution cabinet is abnormal, the three groups of ammeters are out of phase and fuse safely, the power supply should be disconnected in time and reported to the workshop leader or electrician in time, and the power can be turned on only after the problem is solved.

Third, emergency treatment and rescue measures

1. In case of electrical fire, cut off the relevant power supply quickly, put out the fire with dry powder fire extinguisher, immediately dial 5 1 19, and report to the dispatcher on duty and workshop leaders at the same time.

2. If someone gets an electric shock, immediately disconnect the power supply of relevant equipment, so that the electric shock personnel can get rid of the power supply and save themselves on the spot. Give artificial respiration to those who get an electric shock. After receiving the report, the security department and relevant leaders should immediately organize vehicles to send the injured to the nearest hospital for emergency treatment.

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