Method for improving potential distribution of insulators in transmission line in filthy and wet environment

A technology for wet environment and transmission lines, applied in the installation of cables, electrical components, overhead installation, etc., can solve problems such as hidden dangers in the operation of transmission lines, and achieve the effects of high power supply reliability, good economic benefits, and good safety.

Active Publication Date: 2012-09-26
STATE GRID GASU ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of the randomness, variability and multi-influencing factors of pollution, up to now there is no complete and reasonable method to effectively deal with pollution flashover accidents of transmission line insulators, and there are major safety hazards in the operation of transmission lines

Method used

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  • Method for improving potential distribution of insulators in transmission line in filthy and wet environment
  • Method for improving potential distribution of insulators in transmission line in filthy and wet environment

Examples

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Effect test

Embodiment 1

[0037] According to an embodiment of the present invention, a method for improving the potential distribution of insulators in a transmission line in a dirty and humid environment is provided, which is characterized in that it includes:

[0038] a. Based on the historical data of overhead transmission lines, select the flashover frequent section of overhead transmission lines, and select the most frequently used section from the flashover frequent section: towers, wires, and organic composite insulators and tempered glass insulator strings;

[0039] b. In a clean and dry ideal environment, use the three-dimensional model as the finite element model, and incorporate the towers and wires selected in step a into the three-dimensional model, and set artificial boundaries through zero-order asymptotic boundary conditions to truncate the wireless large-scale area to a limited area. area, where: the size of the artificial boundary is based on the fact that the electric field around th...

Embodiment 2

[0046] The difference from the above-mentioned embodiment is that in this embodiment, the finite element models in steps b and c of the above-mentioned embodiment 1 all adopt the following subdivision method: first, the longitudinal interface between the organic composite insulator and the tempered glass insulator string is Surface subdivision, and then take the center line of the organic composite insulator and tempered glass insulator as the axis to surround the entire organic composite insulator and tempered glass insulator string for volume subdivision. The inventors found that using the general method to subdivide an insulator not only takes a long time to subdivide, but also requires a large amount of calculation, and the error between the subdivided finite element model and the original geometric model is relatively large, but this embodiment can effectively reduce the The calculation amount of the simulation.

Embodiment 3

[0048] Different from the above-mentioned embodiment, in this embodiment, the parameter setting of the tower in the model of the above-mentioned embodiment 1 is based on the parameters in the actual line, and the value of the wire length in the model is to reduce the electric field around the insulator at both ends of the wire. influence prevails. For those skilled in the art, the parameter setting principles of the components in the simulation are inclined to the actual parameters in reality, or to ideal modeling, and there is another tendency, which intends to combine the advantages of the first two tendencies. The purpose of the above parameter setting principles is to balance the parameters in practice and the parameters in ideal modeling, but as far as this embodiment is concerned, this embodiment is only intended to limit a specific parameter about the tower and wire in the model As for the setting principle, those skilled in the art can of course also base on the tenden...

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Abstract

The invention discloses a method for improving the potential distribution of insulators in a transmission line in a filthy and wet environment. The method comprises the following steps of: selecting a flashover frequent segment on the basis of the historical data of an overhead transmission line; selecting a pole and tower, a conducting wire, an organic composite insulator and a tampered glass insulator string with largest usage amount from the flashover frequent segment; by utilizing a finite element numerical calculation method and adopting a three-dimensional finite element model, respectively calculating electric field distribution parameters and potential distribution parameters of the corresponding organic composite insulator and the corresponding tampered glass insulator string in an ideal clean and dry environment and an ideal filthy and wet environment, and performing simulation analysis; building a physical test platform for testing; and calling a corresponding potential improvement strategy on the basis of obtained simulation analysis and test results. By the method for improving the potential distribution provided by the invention, the advantages of high power supply reliability of a power grid, high safety and good economic benefit can be realized.

Description

technical field [0001] The present invention relates to the field of high-voltage power transmission, in particular to a method for improving the potential distribution of organic composite insulators and tempered glass insulator strings in overhead power transmission lines under dirty and humid conditions based on the combination of historical data, simulation and testing of overhead power transmission lines . Background technique [0002] In recent years, insulator flashover tripping accidents have occurred many times in the transmission lines of various voltage levels in the power grid, especially in the Northwest Power Grid, which has had a major impact on the reliability of power supply in the power grid and caused great economic losses; according to the analysis of flashover accidents, the pollution accumulated on the surface of insulators It is one of the main causes of flashover, and the research on the potential distribution of insulators is an effective means to pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02G7/00
Inventor 温定筠吕景顺张凯杨志华乔立凤
Owner STATE GRID GASU ELECTRIC POWER RES INST
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