Method of estimating lightning protection of high-voltage transmission line pole/tower earthing device

A technology of high-voltage transmission lines and grounding devices, which is used in the direction of testing dielectric strength and other directions

Inactive Publication Date: 2013-09-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, there are few theoretical methods for researching and evaluating the

Method used

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  • Method of estimating lightning protection of high-voltage transmission line pole/tower earthing device
  • Method of estimating lightning protection of high-voltage transmission line pole/tower earthing device
  • Method of estimating lightning protection of high-voltage transmission line pole/tower earthing device

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Embodiment

[0019] A method for evaluating the lightning protection characteristics of a tower grounding device for a high-voltage transmission line, comprising the following steps:

[0020] Based on the soil fire discharge effect, the physical structure models of square, well and grid-type grounding devices are respectively constructed, as follows figure 1 , 2 , 3, the physical structure model is a distributed parameter model;

[0021] Due to the obvious transient characteristics of the lightning impulse voltage, when analyzing the impact characteristics of the grounding device, it is necessary to consider the influence of the spark discharge effect and the wave process. The equivalent circuits of components such as transformer windings and transformer windings must be represented by distributed parameter circuits (that is, circuits including resistance, inductance, conductance, and capacitance). Therefore, the three physical structure models adopt distributed parameter models and are p...

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Abstract

The invention discloses a method of estimating lightning protection of high-voltage transmission line pole/tower grounding devices. The method includes: establishing three grounding device physical structure models of a square type, a well type and a grid type, which are distribution parameter models; subjecting the physical structure models to simulation analysis by a ground resistor considering spark effect or not considering spark effect on the basis of PSCAD/EMTDC, thus obtaining lower ground impulse resistance of a grounding which considers spark effect; when the spark effect is considered, subjecting injection point overvoltage of the physical structure models to simulation analysis to obtain lightning impulse features of the three grounding devices. Technicians can select proper grounding devices according to actual conditions by the method, so that injection point lightning overvoltage of the grounding devices can be reduced, impulse grounding resistance of the grounding devices is reduced indirectly and lightning protection of poles and towers is improved.

Description

technical field [0001] The invention relates to the field of high-voltage transmission lines, in particular to a method for evaluating the lightning protection characteristics of a tower grounding device of a high-voltage transmission line. Background technique [0002] In the safe operation of power systems, grounding devices have always been valued by relevant design departments and production departments. Data show that more than 50% of transmission line accidents are caused by lightning strikes, and the grounding device plays a vital role in the line lightning protection effect, and its impact characteristics directly determine the lightning protection performance of transmission lines. Due to the high grounding resistance of towers, there are quite a lot of lightning flashover accidents. Many towers located in mountainous areas and with poor geological conditions have a grounding resistance of more than 10Ω, resulting in a low level of lightning resistance of the line. ...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 刘刚张弦许彬
Owner SOUTH CHINA UNIV OF TECH
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