Method for determining single lightning stroke protection effectiveness of overhead line insulator parallel gap

A technology for overhead lines and insulators is applied in the field of judging the effectiveness of single lightning strike protection for parallel gaps of overhead line insulators, which can solve problems such as labor consumption and low efficiency, and achieve the effect of improving judgment efficiency.

Inactive Publication Date: 2017-10-20
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
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  • Method for determining single lightning stroke protection effectiveness of overhead line insulator parallel gap
  • Method for determining single lightning stroke protection effectiveness of overhead line insulator parallel gap
  • Method for determining single lightning stroke protection effectiveness of overhead line insulator parallel gap

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[0059] A method for judging the effectiveness of a single lightning strike protection for an overhead line insulator parallel gap, the steps of which are as follows:

[0060] a) For a lightning strike trip, the tripping phase is obtained through the power system fault location device, and the corresponding lightning strike event is obtained through the lightning location system query, and the lightning current amplitude I of the tower number and the lightning strike is obtained;

[0061] b) Obtain the lightning counter-lightning resistance level I of the lightning strike tower through the design data f , tower grounding resistance, span, and the spatial position of each phase wire, lightning wire, lightning wire radius and sag, wire sag;

[0062] c) Judging whether the lightning strike trip is caused by lightning counterattack or lightning shielding;

[0063] d) Calculate the lightning impulse voltage amplitude borne by the tripping phase insulator and the parallel gap during...

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Abstract

The invention discloses a method for determining single lightning stroke protection effectiveness of an overhead line insulator parallel gap. Currently a method for determining whether an single lightning stroke event parallel gap performs effective protection on an insulator is a manual tower climbing line inspection manner, thereby searching whether a lightning burning trace exists on the surface of the insulator. The method has defects of relatively high manpower consumption and low efficiency. According to the method of the invention, a lightning current amplitude of a single lightning stroke event is acquired through a lightning positioning system, and furthermore a lightning impact voltage threshold which is bear by the insulator and the parallel gap is calculated. According to a protection effectiveness rule of the parallel gap in different lightning impact voltage thresholds, whether protection of the parallel gap to a disc type suspended insulator in the lightning stroke event is effective is determined. According to the method of the invention, protection effectiveness of the parallel gap is determined according to calculation, thereby realizing no manpower consumption and higher efficiency.

Description

technical field [0001] The invention relates to a method for judging the effectiveness of a single lightning strike protection in a parallel gap of a disk-type suspension insulator of an overhead line above 110 kV, specifically a method for judging the effectiveness of a parallel gap protection based on the calculation of the lightning impulse voltage of a lightning strike event and the lightning impulse discharge characteristics of a parallel gap method. Background technique [0002] Parallel gaps have been mostly installed at both ends of the overhead line disc-type suspension insulators. When the line is struck by lightning, the discharge arc is fixed at both ends of the gap to protect the disc-type suspension insulators from arc damage. For a lightning trip event, it is of great significance to judge whether the parallel gap is effective in protecting the insulator. If the protection fails, it is necessary to check the insulator to determine whether the shed of the insu...

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Application Information

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IPC IPC(8): G01R31/12
CPCG01R31/1245
Inventor 李特王少华刘黎胡文堂曹俊平董雪松周象贤蒋愉宽骆阗彦周路遥
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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