What are the special requirements for lightning protection of UHV lines?

Line lightning damage is divided into two types: counterattack and circumvention. Due to the high insulation level of UHV lines, the probability of countering the network is very small. However, the UHV line has a large height and a high phase conductor voltage, and it has certain lightning characteristics. Theoretical calculations and operating practices have shown that the probability of thundercloud bypassing the lightning conductor and directly hitting the conductor increases significantly. For this reason, the ground wire must be moved outside to reduce the protection angle to below 5 degrees. In the area where the ground inclination is significant in the mountainous area, the protection angle should be further reduced to 0 degrees or even a negative protection angle, and the middle leakage hole can be protected by a third ground wire.

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June. 08, 2020