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Power transmission line thunderbolt electromagnetic transient dynamic simulating test system

A technology for electromagnetic transients and transmission lines, which is applied in the fields of measuring electricity, teaching models, measuring electrical variables, etc.

Active Publication Date: 2013-08-21
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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  • Power transmission line thunderbolt electromagnetic transient dynamic simulating test system
  • Power transmission line thunderbolt electromagnetic transient dynamic simulating test system
  • Power transmission line thunderbolt electromagnetic transient dynamic simulating test system

Examples

Experimental program
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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 thunderbolt electromagnetic transient dynamic simulating test system is based on a power transmission line and overhead ground wire model, a pole and tower and pole and tower grounding body model and an insulator model to divide a pole and tower into a diagonal member section, a cross arm section and a principal member section, factors of an insulator, a power transmission line and an overhead ground wire are taken into consideration, and a lighting 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 thunderbolt electromagnetic transient dynamic simulating test system provides a physical testing platform for collecting a power transmission line lighting stroke current and voltage data. Surge currents are added into different positions of the system, signals of a far-end overhead ground wire and a far-end wire are measured, the transmitting process of a lighting wave in the whole power transmission line can be analyzed, and according to an analyzing result, lighting protection of a lighting protection weak section of the power transmission line and substation equipment is optimized. The characteristic quantity analysis is carried out according to a wave form obtained by the measurement, 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 shields 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% of the...

Claims

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Application Information

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IPC IPC(8): G01R31/00
CPCG06F30/367G09B23/18G01R31/00
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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