Method for improving lightning protection capability of ultra- extra-high voltage transmission line

Abstract

The invention relates to a method for improving the lightning protection capacity of a super or ultra high-voltage transmission line. Under the condition of no changing the original line pole tower and conducting wire type, two lightning protection line brackets are arranged on a middle-phase cross pole of the one-tower double-circuit super or ultra-high-voltage pole tower additionally, and two lightning protection lines are arranged on the brackets along the line additionally. Compared with the existing super or ultra high-voltage transmission line, the invention can improve the lightning protection capacity of the super or ultra high-voltage transmission line, and the cost of the newly added lightning protection line brackets and the lightning protection lines is only about 4 percent of the original total cost.

Description

technical field [0001] The invention relates to a method for improving the lightning protection capability of an overhead transmission line, in particular to a method for improving the lightning protection capability of an ultra-high voltage transmission line. Background technique [0002] At present, my country is planning and constructing ultra-high voltage and ultra-high voltage transmission lines on a large scale. The operation experience of my country's ultra-high voltage (AC 330kV~750kV voltage level) transmission lines shows that lightning strikes are one of the main reasons for line tripping, and lightning strikes directly on the conductors. The shielding trips caused by lightning strikes account for about 90% of the total lightning trips; only the former Soviet Union and Japan have experience in the operation of UHV (AC 1000kV and above) transmission lines in the world, and their operating experience shows that the lightning protection problem of UHV transmission line...

AI Technical Summary

Problems solved by technology

[0004] At present, the method of reducing the protection angle of lightning conductors is generally used to improve the anti-shielding ability of EHV and UHV transmission lines, but operating experience shows that this method is not effective for UHV transmission lines with high tower heights and large operating voltage amplitudes. obvious

For example, Japan’s ultra-high voltage transmission line lightning protection line adopts a negative protection angle, and the operating voltage is reduced from ultra-high voltage to ultra-high voltage, but the lightning trip rate caused by shielding is still far beyond the standard

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