Method for measuring impact current division coefficient of power transmission line tower with lightning conductor

Abstract

The invention provides a method for measuring an impact current division coefficient of a power transmission line tower with a lightning conductor. The method comprises the steps of firstly, collecting tower parameters, including the diagonal length of a tower grounding device and the form of the tower, secondly, driving an auxiliary grounding electrode in ground near the tower in such a manner that the distance between the auxiliary grounding electrode and the tower is more than two times the diagonal length of the tower grounding device, connecting a high-voltage end of impact power output with a current divider in series through a high-voltage conductor and then connecting to the joint of the tower and the lightning conductor, and connecting a low-voltage end of impact power output with the auxiliary grounding electrode, wherein the resistor R of the current divider is a high-precision non-inductive resistor of 0.01 ohm. The method is capable of measuring the impact current division coefficient of the power transmission line tower with the lightning conductor, avoiding errors caused by theoretical assumption and improving the accuracy of lightning protection counterattack calculation of the power transmission line.

Description

technical field [0001] The invention relates to a method for measuring the impact shunt coefficient of a power transmission line tower with a lightning protection line. The method is suitable for the lightning protection design and lightning protection transformation of the power transmission line, and belongs to the field of overvoltage in electric power systems. Background technique [0002] Lightning tripping of transmission lines has seriously affected the safe operation of my country's power grid. When calculating the lightning resistance level of a transmission line tower with a lightning protection line, the lightning current shunt coefficient at the tower is required, that is, it is necessary to know how much lightning current flows away from the lightning protection line, how much lightning current flows into the earth along the tower and the grounding device of the tower, and how much lightning current flows into the earth. The ratio of lightning current to total l...

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Problems solved by technology

Since the simulation software can only simulate simple soil structures, such as uniform soil, soil with multi-layer distribution in the vertical direction, soil with multi-layer distribution in the horizontal direction, etc., the actual soil structure is much more complicated, and it is very difficult to measure, so the established soil The model differs greatly from the actual soil structure, and the calculation result of the impact shunt coefficient does not match the actual situation

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