Method for calculating lightning induction voltage of overhead power line tower

A power line and lightning induction technology, which is applied in calculation, electrical digital data processing, special data processing applications, etc., can solve problems such as defects in calculation results

Inactive Publication Date: 2015-08-19
CHONGQING UNIV
View PDF2 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing literatures all calculate the lightning-induced overvoltage of the line under the condition of ignoring the influence of the tower, and the calculation results are flawed.

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for calculating lightning induction voltage of overhead power line tower
  • Method for calculating lightning induction voltage of overhead power line tower
  • Method for calculating lightning induction voltage of overhead power line tower

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0065] Below in conjunction with accompanying drawing, the present invention will be further described:

[0066] 1. Calculation of lightning electromagnetic field based on FDTD sub-grid technology

[0067] Note: In view of the transient characteristics of the lightning electromagnetic field, the finite difference time domain method (FDTD) is selected for calculation; further, because the small-scale tower structure needs to be considered in the calculation process of the large-scale space electromagnetic field, the FDTD subnetwork is adopted grid technology.

[0068] 1.1 Obtain the characteristic parameters of the lightning current waveform, including current peak value, wave head time and wave tail time, return speed, decay constant, etc., and establish the base lightning current model i s (0,t) and lightning current i of return channel s Mathematical model of (z',t).

[0069] It is recommended to use the Heidler model function for the base lightning current:

[0070] ...

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 present invention discloses a method for calculating lightning induction voltage of an overhead power line tower. The method mainly comprises the following steps of: (1) calculating a space lightning electromagnetic field while the influence of the tower is taken into consideration, wherein a sub-grid technology based finite-difference time-domain method is adopted in which a coarse mesh is generated for air space and a fine mesh is generated for the tower; (2) applying a two-dimensional calculation result of the lightning electromagnetic field to field decomposition of a three-dimensional space structure formed by an overhead power line and a lightning current return stroke channel, wherein the lightning electromagnetic field is generated by stimulation of lightning return stroke current; and (3) calculating the lightning induction voltage of the overhead power line and extracting the lightning induction voltage of the tower, wherein the lightning induction voltage of the overhead power line is calculated by using an Agrawal model and an FDTD method, and the tower position is located by grid query and the lightning induction voltage of the tower is extracted. The method can be used for effectively and more accurately estimating the lightning induction voltage of the overhead power line and the lightening induction voltage of insulators and lightning arresters of the tower.

Description

technical field [0001] The invention relates to the field of lightning protection and insulation coordination calculation of overhead power lines, in particular to a calculation method for lightning induced voltage at towers of overhead power lines. Background technique [0002] When lightning strikes the earth, the pulse current released by the lightning will generate a strong radiation electromagnetic field within a space range of several kilometers. Overhead power transmission and distribution lines have a long distance and are exposed in the air. They are easily coupled with the lightning electromagnetic field to form line overvoltage, which will seriously cause line-to-ground or phase-to-phase flashover, damage to terminating transformers and switchgear, etc. Especially for overhead distribution lines of 35kV and below, due to the low insulation level, lightning-induced overvoltage has become the main reason for the increase in line insulation flashover and tripping. I...

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): G06F19/00
Inventor 肖冬萍刘淮通谢雨桐刘小龙姜克儒马启超
Owner CHONGQING UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap