Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for improving insulator potential distribution in overhead power transmission line

A technology for overhead transmission lines and potential distribution, which is applied in the direction of overhead lines/cable equipment, etc., and can solve problems such as potential safety hazards in the operation of transmission lines

Active Publication Date: 2012-09-26
STATE GRID GASU ELECTRIC POWER RES INST +1
View PDF1 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the randomness, variability, and multi-influencing factors of pollution, although many studies have been carried out on the potential distribution of towers, insulators, and pollution at home and abroad, it is still difficult to integrate conductors and towers into the simulation and guide pollution flashover protection. One topic, so far 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] According to an embodiment of the present invention, a method for improving the potential distribution of insulators in overhead transmission lines is provided, including:

[0031] a. Based on the historical data of overhead transmission lines, select the frequent flashover section of the overhead transmission line, and select the towers, wires, organic composite insulators and tempered glass insulator strings with the largest usage from the flashover frequent section;

[0032]b. In a clean and dry ideal environment, use a 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 cut off the wireless large-scale is a limited area, wherein: the size of the artificial boundary is based on the fact that the surrounding electric field of the composite insulator and the tempered glass insulator string hardly ch...

Embodiment 2

[0038] 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: firstly, the composite insulator and the longitudinal interface of the insulator string are plane subdivided, and then Taking the composite insulator and the center line of the insulator string as the axis to surround the entire insulator and the insulator string for volume division. 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

[0040] 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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for improving insulator potential distribution in an overhead power transmission line. The method comprises the following steps of: selecting a flashover frequent segment based on the history data of an overhead power transmission line, and selecting a rod tower, a lead, an organic composite insulator and a toughened glass insulator string which are greatly used from the flashover frequent segment; calculating the electric field and potential distribution parameters of the corresponding organic composite insulator and the toughened glass insulator string by utilizing a finite element value calculation method and adopting a three-dimensional finite element model in an ideal clean and dry environment and a filthy and damp environment for simulation analysis; and calling the corresponding potential improvement strategy based on the simulation analysis result... The method provided by the invention can achieve the advantages of high power supply reliability, good safety and good economic benefit of a power grid.

Description

technical field [0001] The invention relates to the technical field of maintenance and security of power grid transmission lines, in particular to a method for improving the potential distribution of insulators in overhead transmission lines, specifically to improving the potential distribution of organic composite insulators and tempered glass insulator strings in overhead transmission lines in dirty and humid environments method. Background technique [0002] In recent years, the transmission lines of various voltage levels in the power grid, especially the Northwest Power Grid, have repeatedly experienced insulator flashover tripping accidents, which have had a major impact on the reliability of the power supply of the power grid and caused great economic losses; according to the analysis of flashover accidents, the accumulation of insulator surface Pollution is one of the main causes of flashover, and the research on the potential distribution of insulators is an effecti...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02G1/02
Inventor 温定筠孙亚明马建海胡春江王成生
Owner STATE GRID GASU ELECTRIC POWER RES INST