Method for optimizing potential distribution of lightning arrester by changing arrangement mode of voltage-sharing capacitors

A technology of equalizing capacitance and potential distribution, which is applied to overvoltage arresters, circuits, and electrical components using spark gaps. The effect of solving extremely uneven potential distribution and improving operating life

Active Publication Date: 2021-05-28
WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a method for optimizing the potential distribution of the arrester by changing the arrangement of the voltage equalizing capacitors, which solves the problem of extremely uneven local potential distribution of the arrester unit and rapid deterioration of the local resistance sheet, and has The advantages of improving the operating reliability of the arrester and ensuring the safe operation of the power system

Method used

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  • Method for optimizing potential distribution of lightning arrester by changing arrangement mode of voltage-sharing capacitors
  • Method for optimizing potential distribution of lightning arrester by changing arrangement mode of voltage-sharing capacitors
  • Method for optimizing potential distribution of lightning arrester by changing arrangement mode of voltage-sharing capacitors

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Embodiment 1

[0049] see Figure 1-Figure 6 , a method for optimizing the potential distribution of the arrester by changing the arrangement of the equalizing capacitors, comprising the following steps:

[0050] Step 1: Establish the three-dimensional electrostatic field calculation model of the arrester. The arrester is an AC gapless oxide arrester with parallel voltage equalizing capacitors, which is composed of multiple units in series. The high voltage end of the arrester is equipped with a voltage equalizing ring. The material of the voltage equalizing ring is Made of aluminum, the low-voltage end is equipped with an insulating base and a metal bracket. Some units of the arrester have parallel voltage equalizing capacitors. The outer casing of the arrester is made of porcelain or organic composite materials. The numbers are, 1# unit, 2# unit, 3# unit....

[0051] Step 2: Carry out potential simulation calculation on the arrester. The electrostatic field analysis method is used in the ...

Embodiment 2

[0072] A method for optimizing the potential distribution of a lightning arrester by changing the arrangement of voltage equalizing capacitors, characterized in that it includes the following steps:

[0073] Step 1: See Figure 4 , to build a 750kV porcelain jacket AC gapless metal oxide surge arrester simulation model, the surge arrester is an AC gapless oxide surge arrester with parallel voltage equalizing capacitors, which is composed of multiple units connected in series, and the high voltage end of the arrester is equipped with a voltage equalizing ring. The ring is made of aluminum, and the low-voltage end is equipped with an insulating base and a metal bracket. There are parallel voltage equalizing capacitors in some units of the arrester, and the jacket of the arrester is made of porcelain or organic composite materials. The serial numbers of the low-voltage side are, 1# unit, 2# unit, 3# unit....

[0074] Step 2: See Figure 5 , considering the actual structure of t...

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Abstract

The invention discloses a method for optimizing potential distribution of a lightning arrester by changing an arrangement mode of voltage-sharing capacitors. The method comprises the following steps of 1, building a three-dimensional electrostatic field simulation calculation model of the lightning arrester, 2, calculating various data of the lightning arrester under the continuous operation voltage by using a finite element method, and 3, according to the potential distribution curve under the original design structure of the lightning arrester, adjusting the arrangement mode of the parallel voltage-sharing capacitors in the lightning arrester. The method has the advantages that the operation reliability of the lightning arrester is improved, the safe operation of a power system is guaranteed, the problems that the local potential distribution of the lightning arrester unit is extremely uneven and the local resistor disc is quickly degraded are solved, and the method is suitable for the power system.

Description

technical field [0001] The invention relates to the technical field of lightning protection, in particular to a method for optimizing the potential distribution of a lightning arrester by changing the arrangement mode of voltage equalizing capacitors. Background technique [0002] In the power system, the arrester is an indispensable overvoltage protection device. However, due to the large size and complex structure of ultra-high voltage and ultra-high voltage arresters, under high continuous operating voltage, the earth and the stray capacitance of the grounding body around the installation point and the charged body will seriously distort the axial potential distribution of the resistor. The resistor near the high-voltage end bears excessively high continuous operating voltage and thus bears a greater electrical stress load. In addition, the ultra-high voltage and ultra-high voltage surge arresters are designed with a high charge rate, and the deterioration of the local re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01T4/20
CPCH01T4/20
Inventor 谷山强曹伟吴钰颖万帅郭洁谭进刘新刘子皓杜雪松王智凯
Owner WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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