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A Lightning Electromagnetic Transient Dynamic Model Experiment System for Transmission Lines

A technology of electromagnetic transients and transmission lines, applied in the direction of measuring electricity, teaching models, measuring electrical variables, etc., can solve problems such as electromagnetic transient simulation systems for lightning strikes that have not been seen on transmission lines

Active Publication Date: 2015-09-02
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there is no electromagnetic transient simulation system for lightning strikes on transmission lines.

Method used

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  • A Lightning Electromagnetic Transient Dynamic Model Experiment System for Transmission Lines
  • A Lightning Electromagnetic Transient Dynamic Model Experiment System for Transmission Lines
  • A Lightning Electromagnetic Transient Dynamic Model Experiment System for Transmission Lines

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0055] The structure of the dynamic model test bench (that is, the experimental system):

[0056] 1. The model of transmission line and lightning protection line;

[0057] 2. Tower and tower grounding body model;

[0058] 3. Insulator model.

[0059] Transmission line and lightning conductor model

[0060] The selected section length of the π-type equivalent model of the line in the present invention is L=λ / 10, where λ is the maximum frequency component of the spectrum after the Fourier transform of the lightning transient current acting on the line, and the wavelength of the electromagnetic wave in the medium around the line. Therefore, the segment line elements satisfy the static field assumption with respect to the lightning wave.

[0061] The invention provides an accurate method for building a physical model of a lightning channel when a lightning strikes a power transmission line and a tower. Different from the traditional transmission line model, this model table ad...

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Abstract

A power transmission line lightning electromagnetic transient dynamic simulation experimental system is based on a power transmission line and lightning conductor model, a tower and tower grounding body model and an insulator model; A tower is divided into a diagonal member section, a cross arm section and a principal member section; meanwhile, factors of an insulator, a power transmission line and an lightning conductor are taken into consideration; and a lightning stroke transient equivalent circuit is simulated and constructed through corresponding wave impedance, self-impedance, mutual impedance, self-admittance, mutual admittance, inductance and the like. The power transmission line lightning electromagnetic transient dynamic simulation experimental system provides a physical experimental platform for collecting lightning stroke current and voltage data along a power transmission line. Surge current is added into different positions of the system, signals of a far-end lightning conductor and a far-end wire are measured, the transmission process of a lightning wave in the whole power transmission line can be analyzed, and according to an analysis result, the lightning protection to the section weak in lightning protection on the power transmission line and to the substation equipments is optimized. The characteristic quantity is analyzed according to a wave form obtained from the measurement, and a pattern recognition method of power transmission line direct stroke and shielding failure flashover can be provided.

Description

technical field [0001] The invention relates to an electromagnetic transient process simulation system of a power transmission line when lightning strikes, in particular to an electromagnetic transient process simulation test system when lightning directly strikes the top of a tower or a lightning shield strikes a transmission wire. Background technique [0002] Judging from the actual operation of power grids in various countries, lightning strikes are still the main hazard to the safe and reliable operation of transmission lines, and the proportion of line trips caused by lightning strikes to the total number of faults continues to increase. More than half of the power system accidents in Japan and Sweden were caused by lightning strikes on transmission lines; Egypt also had a national power outage due to lightning strikes on transmission lines; - 500kV voltage level transmission lines have been in operation for 3 consecutive years, and lightning accidents have reached 60%...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
CPCG09B23/18G06F17/5036G06F30/367G01R31/00
Inventor 李建明聂鸿宇陈少卿马啟潇张榆文艺
Owner STATE GRID CORP OF CHINA
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