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Differentiation method of lightening back flashover and lightening shielding failure on electric transmission line

A technology of transmission lines and identification methods, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as inaccurate judgment of lightning strike types, and achieve good application prospects

Inactive Publication Date: 2013-08-07
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0081] In order to solve the problems existing in the above-mentioned prior art, the present invention aims at the problem of inaccurate judgment of the current lightning strike type, and proposes a lightning strike type identification method based on the time domain characteristics of lightning traveling waves, so as to realize accurate identification of the lightning strike type

Method used

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  • Differentiation method of lightening back flashover and lightening shielding failure on electric transmission line
  • Differentiation method of lightening back flashover and lightening shielding failure on electric transmission line
  • Differentiation method of lightening back flashover and lightening shielding failure on electric transmission line

Examples

Experimental program
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Effect test

Embodiment 1

[0106] In step S1, the power frequency component is removed from the three-phase current of the transmission line, and whether lightning counterattack occurs on the transmission line is identified according to the polarity of the three-phase line.

[0107] After the preliminary processing of the traveling wave waveform detected in this embodiment, as Figure 4 shown. Since the polarities of the three-phase current traveling waves are all positive, the interference of the transmission line comes from outside the line, that is, the lightning strikes back on the transmission line, and the identification ends.

Embodiment 2

[0109] In step S1, the power frequency component is removed from the three-phase current of the transmission line, and whether lightning counterattack occurs on the transmission line is identified according to the polarity of the three-phase line.

[0110] After the preliminary processing of the traveling wave waveform detected in this embodiment, as Figure 5 shown. Since the polarity of phase A is positive, the polarity of phase B and C is negative, and the polarities of the three phases are different, it means that there is no lightning counterattack on the transmission line, and the line interference comes from the inside, which may be due to shielding on the phase A line Or a line failure has occurred.

[0111] Step S2, calculating the traveling wave correction energy ratio;

[0112] Specific steps are as follows:

[0113] ① Determine the starting time t of the current traveling wave according to the first two current traveling waves of the non-fault phase 1 , end tim...

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Abstract

The invention provides a differentiation method of lightening back flashover and lightening shielding failure on an electric transmission line. The method is used for differentiating lightening references when travelling wave protection and fault location, and includes firstly differentiating the back flashover on the electric transmission line according to differences and similarities of three-phase travelling wave polarities, and then providing a differentiation method of the shielding failure on the electric transmission line based on travelling wave correction energy ratio in a short window through the travelling wave energy variations when the electric transmission line is suffered from the shielding failures and the faults. The differentiation method is clear in differentiation basis, lightening interferences on the electric transmission line can be accurately differentiated, and types of the interferences can be judged.

Description

technical field [0001] The invention relates to the technical field of identification of lightning strike interference on transmission lines, in particular to a method for identifying lightning counterattack and lightning shielding strikes on transmission lines. Background technique [0002] Transmission lines are extremely susceptible to lightning interference during operation. According to statistics, lightning trips account for about 40% of line trips. At this time, how the fault location device can effectively identify the interference signal is the prerequisite for the reliable operation of the fault location system. If the lightning strike causes the insulation flashover of the line, the effective identification of the lightning strike type can provide guidance for the follow-up maintenance work. [0003] The abnormal operation state of the transmission line can be considered to be caused by the interference of the line. Due to the mutual coupling relationship between...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 申文严英杰岳天琛宋辉钱勇胡岳冯琳
Owner SHANGHAI JIAO TONG UNIV
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