Method for detecting effective impact length of grounding electrode of power transmission line tower

A technology of transmission line and effective length, applied in the direction of grounding resistance measurement, measuring device, measuring electric variable, etc.

Active Publication Date: 2020-11-03
SOUTHWEST JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As far as lightning protection is concerned, the impact characteristics of the grounding device and its power frequency characteristics are quite different

Method used

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  • Method for detecting effective impact length of grounding electrode of power transmission line tower
  • Method for detecting effective impact length of grounding electrode of power transmission line tower
  • Method for detecting effective impact length of grounding electrode of power transmission line tower

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] The schematic diagram of the shock dissipation process of the horizontal grounding body of the transmission line tower is attached figure 1 As shown, point 1 is the position where the impulse current is injected into the grounding body, and the shaded area in the figure indicates the diffused area. Figure 1 It can be seen that from the moment of impulse current injection, the current density of the horizontal grounding body is the highest at the current injection point, and the area where the flow flows to the ground due to the inductance of the conductor is mainly concentrated near the current injection point. With the longitudinal propagation of the impulse current, the part of the grounding body that participates in the flow to the soil continues to increase, until the entire conductor participates in the flow to...

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PUM

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Abstract

The invention discloses a method for detecting the impact effective length of a grounding electrode of a power transmission line tower, and the method comprises the steps: testing the impact groundingresistance of the grounding electrode, and judging the effective length of the grounding electrode according to an obtained impact voltage response; judging whether the grounding electrode reaches the effective length or not by calculating the transient impedance of the grounding body and judging the relation between the wave tail impedance and the impact grounding resistance. The method is simple and convenient to calculate and has definite physical significance, the effective length of the grounding body can be detected, the impact characteristic of the grounding body can be analyzed through the impedance relation of the grounding body, evaluation of the safety performance of the grounding device is facilitated, and a basis is provided for structural transformation and optimization of the grounding device.

Description

technical field [0001] The invention belongs to the field of electric power system overvoltage, and in particular relates to a detection method for the impact effective length of a ground pole of a power transmission line tower. Background technique [0002] With the gradual increase of the voltage level of transmission lines, accidents caused by lightning strikes on transmission lines are also increasing. When the lightning wave hits the tower or the lightning conductor, most of the lightning current will flow into the earth through the grounding device. If the grounding resistance is too high, the lightning current will generate a very high overvoltage on the top of the tower, causing the insulator to flash over and causing the line to jump. Therefore, the lightning protection performance of the transmission line is related to the impact grounding resistance of the grounding device. Single or multiple horizontal long conductors are the main form of tower grounding. In ar...

Claims

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Application Information

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IPC IPC(8): G01R27/20G01R27/08
CPCG01R27/08G01R27/205
Inventor 曹晓斌魏铭李瑞芳王满想王海鳗陈思奇刘家材
Owner SOUTHWEST JIAOTONG UNIV
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