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Method, system, terminal and readable storage medium for obtaining lightning discharge voltage of transmission line tower window

A transmission line tower, discharge voltage technology, applied in the direction of testing the dielectric strength, etc., can solve the problems of large time cost, manpower and material resources, deviation, inability to calculate the negative polarity discharge process, etc., to save manpower and material costs, and the calculation results are reliable Effect

Active Publication Date: 2022-05-17
STATE GRID HUNAN ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the traditional way to obtain the lightning discharge voltage of the tower window is generally obtained through the traditional true type test, but this method requires a lot of time, manpower and material resources
Moreover, the existing discharge calculation method cannot calculate the negative polarity discharge process, and only considers the development of the positive polarity leader, resulting in a large deviation between the final result and the actual situation

Method used

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  • Method, system, terminal and readable storage medium for obtaining lightning discharge voltage of transmission line tower window
  • Method, system, terminal and readable storage medium for obtaining lightning discharge voltage of transmission line tower window

Examples

Experimental program
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Embodiment 1

[0040] Step 1: Use the electromagnetic transient simulation software to model the wire and the pole tower to obtain the pole tower and the ground wire electromagnetic transient model, the standard lightning current waveform as the excitation source, the lightning current generation overvoltage calculation, and the lightning current waveform u(t) generated at the wire in the tower window position after the lightning current hits the middle wire.

[0041] Step 2: Time-domain discretization of the lightning overvoltage u(t) with time change, and each discretized voltage data serves as an iterative excitation source during the calculation of tower window discharge.

[0042] Step 3: Use finite element software to establish a two-dimensional model of the tower window, that is, the tower window model, in which the size of the tower head, the height of the tower window to the ground, the size of the insulator string, the radius of the wire splitting, the voltage parameters on the wire are...

Embodiment 2

[0050] In this implementation, the electromagnetic transient simulation software ATP-EMTP is selected to calculate the overvoltage waveform calculation during lightning strike line; the finite element analysis tool COMSOL is used to realize the modeling needs of the potential and electric field distribution calculation of the gap structure to be analyzed; and the simulation program that uses the interface between COMSOL and Matlab to realize the negative polarity tower window discharge process, wherein the process of the simulation program is:

[0051] Step S1, first of all, according to the actual tower window structure, wire electrical parameters in the ATP-EMTP software modeling to build a pole tower and ground wire electromagnetic transient model, and input the standard lightning current waveform, the lightning current waveform generated at the tower window position wire after the lightning current hits the wire in the file calculation and derivation and discrete processing, t...

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Abstract

The invention discloses a method, a system, a terminal and a readable storage medium for obtaining the lightning strike discharge voltage of a tower window of a power transmission line. The physical modeling of the negative polarity discharge of the high-voltage tower window calculates the background space electric field distribution in the gap discharge channel, and finally, according to the calculation model of the long air gap discharge, the lightning breakdown voltage of the positive and negative polarity leaders developing in opposite directions is obtained. Compared with the traditional calculation method, this method considers the development process of the negative polarity leader generated by the wire, which is more in line with the actual occurrence of UHV lightning strikes, and has important engineering significance.

Description

Technical field [0001] The present invention belongs to the field of lightning protection technology of transmission lines, specifically relates to a transmission line tower window lightning strike discharge voltage acquisition method, system, terminal and readable storage medium. Background [0002] AC and DC UHV transmission lines can realize high-power medium- and long-distance transmission, and are an important transmission artery for realizing China's west-to-east power transmission. The operation experience of UHV transmission lines shows that lightning strike is the main cause of the tripping of UHV transmission lines, due to the high insulation configuration of UHV line insulators, the lightning strike flash network of UHV lines is mainly for the wire to be discharged at the tower window after the wire is struck by lightning. Therefore, it is necessary to calculate the discharge voltage of the ultra-high tower window, and then design the optimal value of the UHV tower wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
CPCG01R31/12Y02E60/00
Inventor 岳一石廖振宇邹妍晖巢亚锋黄福勇王成周卫华
Owner STATE GRID HUNAN ELECTRIC POWER