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Lightning shielding failure and counterattack recognition method based on lightning positioning system records and circuit travelling wave data

A lightning positioning system and transmission line technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of poor reliability and insufficient accuracy, and achieve the effect of high accuracy, simple method and strong reliability

Inactive Publication Date: 2015-07-29
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of insufficient accuracy and poor reliability of existing lightning shielding and counterattack identification methods, and propose a lightning shielding and counterattack identification method based on lightning positioning system records and line traveling wave data

Method used

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  • Lightning shielding failure and counterattack recognition method based on lightning positioning system records and circuit travelling wave data
  • Lightning shielding failure and counterattack recognition method based on lightning positioning system records and circuit travelling wave data
  • Lightning shielding failure and counterattack recognition method based on lightning positioning system records and circuit travelling wave data

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The complete model of 220kV transmission line tower is as follows: figure 2As shown, the model is a 2240ZM1 cat-head straight tower, and its specific parameters are: the average suspension height of the wires h d is 24.0m; the average suspension height of the lightning conductor is h b is 30.5m; the slope angle α of the tower is 25°; the wire protection angle θ is 10°.

[0050] (1) According to the electrical model of the transmission line tower, the critical current amplitude of the shielding strike is calculated as: .

[0051] I K = { ( 24 + 30.5 ) 16 [ 1 - sin ( 10 + ...

Embodiment 2

[0054] Embodiment 2: The parameters of the tower model of the 220kV transmission line are the same as those in Embodiment 1.

[0055] (1) Calculate the shielding critical current amplitude according to the electrical model of the transmission line tower:

[0056] I K = { ( 24 + 30.5 ) 16 [ 1 - sin ( 10 + 25 ) ] } 20 13 = 24.455 kA .

[0057] (2) When the transmission line is struc...

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Abstract

The invention discloses a lightning shielding failure and counterattack recognition method based on lightning positioning system records and circuit travelling wave data. The method includes calculating a shielding failure critical current amplitude according to an electric model of a electric transmission line tower; when an electric transmission line is struck by lightning, calculating time differences between a wave arrival moment acquired by the measuring end of a travelling wave distance measuring device and multiple lightning stroke record moments of a lightning positioning system, extracting a lightning current amplitude of a lightning stroke record corresponding to the minimum value of the time differences, comparing the lightning current amplitude with the shielding failure critical current amplitude, and if the lightning current amplitude is larger than the shielding failure critical current amplitude, determining counterattack, or otherwise, determining shielding failure. The lightning shielding failure and counterattack recognition method has the advantages that lightning shielding failure and counterattack recognition can be completed through direct use of the lightning positioning system records and the circuit travelling wave data, and digital signal processing of waveforms is not needed, so that the method is simple; judgment results are consistent with fault line patrol records, and accuracy and reliability are high.

Description

technical field [0001] The invention relates to a lightning shielding and counterattack identification method based on lightning positioning system records and line traveling wave data, and belongs to the technical field of electric power system relay protection. Background technique [0002] Transmission lines are an important part of the power system. Operation experience at home and abroad shows that direct lightning strikes are the main cause of tripping of high-voltage transmission lines, so strengthening the lightning protection of transmission lines plays an important role in ensuring the safe and stable operation of power systems. When lightning strikes cause insulation flashover, the effective identification of lightning strike fault types can provide reference for lightning protection design and provide a basis for improving insulation coordination of transmission lines. [0003] At present, most of the theoretical research on shielding and counterattack stays in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 马仪黄然申元周仿荣束洪春余多白冰
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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