Won't the high-speed rail power supply short-circuit in rainy days?

Short circuit will not occur between foggy days, because the insulation distance when the air is wettest is considered in the design of high-voltage lines.

Heavy rain won't short-circuit each other, because no matter how heavy the rain is, it will be a little bit, and generally it won't short-circuit. Even if it is short-circuited occasionally, it is no problem. The automatic device immediately cut off the power supply, and put into operation after 1 s, and the insulation capacity of the line recovered quickly.

The short circuit between the transmission line and the earth often occurs, especially in dry autumn and winter, when there is a lot of dust on the insulator, when there is fog or Mao Mao rain, the transmission line will fail. The mechanism of the occurrence and development of the terms "pollution flashover" and "fog flashover" is complicated, but the failure can be reduced by adding insulators. However, if it rains cats and dogs at this time, it won't be bad.

This kind of insulation damage to the ground, the line can continue to run for a period of time in the power system where the neutral point is not grounded below 35KV, because the capacitance current flowing through the insulation damage point is very small, which will not affect the continuous operation of the line. After a long time, the damaged point of insulation will be heated and dried, and insulation may be restored automatically. However, in systems above 1 10kV, the neutral point is directly grounded and the line will be switched immediately.