A Method of Improving the Accuracy of Fault Location in EHVDC Transmission Lines

A technology for DC transmission lines and fault location, applied in directions such as fault locations, can solve the problems of complex traveling wave waveforms, inability to determine fault locations, obstacles, etc., and achieve the effect of reducing processing time and reducing the time for inspection and inspection.

Active Publication Date: 2017-12-05
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] The current common fault location identification method relies on traveling wave distance measurement on overhead lines. It becomes relatively complicated, causing the background of the ranging device to calculate multiple possible fault locations, resulting in the failure of ranging; sometimes the same line is installed with fault ranging devices developed by different manufacturers, which will give different fault locations, resulting in failure Determine the real fault location; some line sections do not even install fault distance measuring devices at all; these factors have caused great obstacles to the line operating unit to quickly determine the fault location and organize line maintenance personnel to quickly deal with line faults

Method used

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  • A Method of Improving the Accuracy of Fault Location in EHVDC Transmission Lines
  • A Method of Improving the Accuracy of Fault Location in EHVDC Transmission Lines
  • A Method of Improving the Accuracy of Fault Location in EHVDC Transmission Lines

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Embodiment

[0027] Such as Figures 1 to 4 As shown, a method to improve the accuracy of fault location of EHVDC transmission lines includes:

[0028] Step A. After the fault triggers the tripping of the line, use traveling wave ranging to obtain the position of each suspected fault point or the entire tripping line;

[0029] Step B. When the line trip does not belong to the joint trip, query the various external disasters that occurred near each of the suspected fault points or the location of the entire trip line, and calculate the line caused by the influence of the various external disasters. The degree of membership of the trip;

[0030] Step C, querying each defect of the line, and calculating the probability of tripping caused by the line under the influence of each defect of itself;

[0031] In step D, the most probable fault location is obtained by synthesizing the above membership degrees and probabilities.

[0032] Using the above technical solution, when a line fault occurs...

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Abstract

The invention provides a method for improving the accuracy of fault location of ultra-high-voltage direct current transmission lines. When a fault occurs on the line, the method can determine the real fault location by querying the defect information of the fault line and real-time information such as meteorological systems according to the location information of the fault. And the actual cause of the line failure, so as to propose a solution, which can greatly shorten the time for the staff to deal with the failure and reduce the economic loss caused by the failure.

Description

technical field [0001] The invention relates to the field of high-voltage power transmission in electric power systems, in particular to a method for improving the accuracy of fault location of ultra-high voltage direct current transmission lines. Background technique [0002] my country's economy continues to develop, and the requirements for power supply are getting higher and higher, so the power industry is also constantly developing in response to social requirements. In order to ensure sufficient power supply in coastal areas with dense power loads, China Southern Power Grid has formed 15 west-to-east power transmission channels of "seven direct currents and eight alternating currents" of 500 kV and above, all of which are more than 1,000 kilometers long. Longer, so the probability of failure on the line corridor is higher. These long transmission lines shoulder the important task of connecting the resource-rich areas in the west and the power load center in the east....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
Inventor 李晋伟张怿宁宋云海钱海陈岳王奇黄义隆王振何珏甘振宁陈浩宁孙萌常安陈彦州
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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