5 reasons for the sudden explosion of the lightning arrester during operation:

1. The single-phase grounding of the neutral point ungrounded system can increase the non-faulty phase-to-ground voltage to the line voltage. Although the withstand voltage of the lightning arrester is less than the power frequency discharge voltage, if it is operated for a long time in this case, it may cause an explosion .

2. The ferroresonance overvoltage in the power system causes the lightning arrester to discharge and burn out the components to cause an explosion.

3. The line is struck by lightning, the lightning protector is activated, and its own spark gap arc extinguishing performance is poor, can not withstand the arc complex voltage is broken down, the arc reignition power frequency freewheeling will appear gradually, and the gap will reburn repeatedly to cause the valve plate The resistor burned out, causing coal explosion.

4. The resistance of the lightning protection valve sheet does not meet the specifications, the residual pressure decreases and the freewheeling flow increases, the gap is extinguished, and the valve sheet burns and explodes through freewheeling for a long time.

5. Poor sealing of the porcelain sleeve, and the lightning arrester is prone to damp and water ingress to cause an explosion during operation.