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Fault single-end locating method based on Thompson theory arc model

A technology based on Thompson theory and ranging method, which is applied in the field of single-ended fault ranging, which can solve the problems of inconspicuous fault voltage and current characteristics, detection and removal of protection devices, etc., so as to achieve a simple ranging method and reduce the damage of faults. , easy-to-find effects

Inactive Publication Date: 2016-07-06
STATE GRID ANHUI ELECTRIC POWER CO LTD
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Problems solved by technology

However, if there is a large value of transition resistance at the grounding point, such as high-resistance grounding faults caused by insulator flashover, lightning strikes, wildfires, etc. The size of the fault current may eventually cause the fault voltage and current characteristics to be indistinct and cannot be detected and cut off by traditional protection devices

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  • Fault single-end locating method based on Thompson theory arc model
  • Fault single-end locating method based on Thompson theory arc model
  • Fault single-end locating method based on Thompson theory arc model

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with the accompanying drawings and examples, and the contents of the examples are not intended to limit the protection scope of the present invention.

[0044] Most of the high-resistance ground faults are arc faults, and the modeling of fault arc waveform is the basis of high-resistance ground fault research.

[0045] 1. Description of arc physical essence

[0046] The physical essence of the fault arc is the air discharge phenomenon. Drawing on Thomson's theory, the arc phenomenon includes three discharge stages:

[0047] (1) External ionization: Near the zero-crossing point of the AC voltage of the high-voltage transmission line, the voltage at both ends of the arc is small and cannot excite cathode electrons, the current density is extremely small, and the arc is in a state of short-term extinction.

[0048] (2) Impact ionization: As the AC voltage increases, the kinetic energy of electrons existi...

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Abstract

The invention relates to a fault single-end locating method based on a Thompson theory arc model. The algorithm comprises the steps that a Thompson theory model equation is established, the logarithmic relationship between voltage and current in air arc is deduced from the Thompson collision theory, a logarithmic model of fault point voltage uF about zero sequence current i0 is established, the logarithmic model is substituted and final simplifying and solving are performed so that fault single-end locating is performed. Fault single-end locating is enabled to be more accurate by the fault single-end locating method.

Description

technical field [0001] The invention relates to a fault single-end ranging method, in particular to an arc model derivation based on Thomson's theory, and an algorithm for using the model to perform fault single-end ranging. Background technique [0002] According to the statistical analysis of various faults, in short-circuit faults, the number of single-phase ground faults accounts for almost 90% of all fault types, and from the analysis of fault recordings, it is found that a considerable part of phase-to-phase faults is caused by single-phase ground faults. developed. Especially for high-voltage transmission lines passing through mountainous terrain, single-phase high-resistance grounding faults often occur due to the discharge of the line to the surrounding tree branches and moso bamboo and the discharge of the fire to the line due to insulator flashover and lightning strikes. After a single-phase high-resistance grounding fault occurs, often because the protection can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/088
Inventor 王海港谢民孙月琴黄太贵邵庆祝叶远波王同文
Owner STATE GRID ANHUI ELECTRIC POWER CO LTD
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