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A Single-Ended Traveling Wave Fault Location Method Using Timing Intervals of Positive and Negative Polarity Wave Heads

A technology of fault distance measurement and positive and negative polarity, which is applied in the direction of fault location, information technology support system, etc., and can solve problems such as large investment and large distance measurement error

Active Publication Date: 2015-08-12
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to propose a method for single-ended traveling wave fault distance measurement using positive and negative polarity wave head timing intervals for the situation where the lightning strike point and the flashover point of the UHV transmission line are inconsistent. Terminal traveling wave ranging equipment requires a lot of investment, data acquisition synchronization is required, and data exchange communication is required, while the traditional single-ended traveling wave ranging method has problems and shortcomings such as large ranging errors

Method used

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  • A Single-Ended Traveling Wave Fault Location Method Using Timing Intervals of Positive and Negative Polarity Wave Heads
  • A Single-Ended Traveling Wave Fault Location Method Using Timing Intervals of Positive and Negative Polarity Wave Heads
  • A Single-Ended Traveling Wave Fault Location Method Using Timing Intervals of Positive and Negative Polarity Wave Heads

Examples

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Effect test

Embodiment 1

[0093] Example 1: Lightning strikes phase A of the transmission line, and the distance between the lightning strike point and the M terminal is 65 , the flashover point (fault point) is 80 meters away from the M terminal , the fault traveling wave waveform detected and recorded by the measuring terminal M is as follows Figure 5 As shown, the traveling wave data 4ms after the fault is intercepted, and the cubic B-spline wavelet function is used to perform wavelet transform on it to find the modulus maximum value. The result is as follows Image 6 shown. Starting from the moment when the initial traveling wave of the current first arrives at the M terminal, in the subsequent The polarity and arrival time of traveling wave heads with different properties are calibrated within the time length, and the results are shown in Table 1.

[0094] Table 1 Calibration results of positive and negative sequence traveling wave head timing when the lightning point is close to the M term...

Embodiment 2

[0107] Example 2: Lightning strikes phase A of the transmission line, and the distance between the lightning strike point and the M terminal is 95 , the flashover point (fault point) is 80 meters away from the M terminal , the fault traveling wave waveform detected and recorded by the measuring terminal M is as follows Figure 7 As shown, the traveling wave data 4ms after the fault is intercepted, and the cubic B-spline wavelet function is used to perform wavelet transform on it to find the modulus maximum value. The result is as follows Figure 8 shown. Starting from the moment when the initial traveling wave of the current first arrives at the M terminal, in the subsequent The polarity and arrival time of traveling wave heads with different properties are calibrated within the time length, and the results are shown in Table 2.

[0108] Table 2 Calibration results of positive and negative sequence traveling wave head timing when the flashover point is close to the M ter...

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Abstract

The invention provides a single-ended traveling wave fault location method using positive and negative wave head time sequence intervals, which belongs to the technical field of power system relay protection. The method comprise the following steps of when lightning occurs on a power transmission line, and lightning points are not accordant with flashover points, detecting and recording current travelling wave data at a measuring end; judging the distribution situations of the lightning points and fault points on the power transmission line according to related characteristics of travelling wave, and resolving the modulus maximum of the current travelling wave data by using wavelet transform to obtain the travelling wave heads on a time axis; and calibrating the polarity and arrival moments of the travelling wave heads arriving at the measuring end, resolving multiple groups of fault distances through corresponding formulae by using a corresponding relation between a period (namely, the time sequence interval between adjacent wave heads) of wave heads of the same properties and a fault position, and averaging the multiple groups of fault distances to obtain a fault location result. The method has the advantages of reducing investment on location equipment, small location errors and the like.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a method for single-terminal traveling wave fault distance measurement by using positive and negative polarity wave head timing intervals when the lightning strike point is inconsistent with the flashover point. Background technique [0002] Lightning strike faults are one of the main forms of transmission line faults, and direct lightning strikes are the main ones. When the lightning directly hits the top of the tower or the lightning conductor, the amplitude of the lightning current is relatively large, resulting in a flashover of the insulators within a distance from the tower. In this case, the lightning strike point is considered to be consistent with the flashover point. If the lightning strikes the conductor, the amplitude of the lightning current is small at this time, and after the lightning traveling wave travels along the conductor for a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCY04S10/522Y04S10/52
Inventor 束洪春田鑫萃高利
Owner KUNMING UNIV OF SCI & TECH
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