Wavelet difference algorithm-based cable fault localization method

A cable fault, differential algorithm technology, applied in the fault location, measurement device, electrical device and other directions, can solve the problem of inability to identify the fault area, low ranging accuracy, etc.

Inactive Publication Date: 2010-12-08
XIAN UNIV OF SCI & TECH
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a cable fault distance measurement method based on wavelet difference algorithm in view of the deficiencies in the above-mentioned prior art. There are practical problems that the cable fault detection method cannot identify the fault area, the distance measurement accuracy is low, and it is easily affected by various factors

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  • Wavelet difference algorithm-based cable fault localization method
  • Wavelet difference algorithm-based cable fault localization method
  • Wavelet difference algorithm-based cable fault localization method

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Embodiment Construction

[0051] Such as figure 1 , figure 2As shown, a kind of cable fault location method based on wavelet difference algorithm of the present invention comprises the following steps:

[0052] Step 1. Signal real-time detection and synchronous upload: through the current detection unit 1, the ABC three-phase current at the beginning end of the three-phase cable under test is respectively detected in real time, and the real-time detected three-phase current signal i A i B and i C The I / V conversion is performed by the signal conditioning circuit 2 respectively, and the corresponding three-way voltage signal u obtained after the I / V conversion is A , u B and u C Synchronously upload to the data acquisition card 3. The total length of the tested three-phase cable is L.

[0053] In this embodiment, the current detection unit 1 in step 1 is three current transformers for real-time detection of the ABC three-phase current at the beginning of the three-phase cable to be tested, and t...

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Abstract

The invention discloses a wavelet difference algorithm-based cable fault localization method. The method comprises the following steps of: 1, detecting a signal in real time and synchronously uploading the signal; 2, performing signal acquisition; 3, performing cable fault localization by steps of performing signal pre-treatment which comprises normalization treatment, de-noising treatment and fault signal modulus transformation, judging a wavelet packet entropy fault region, determining the fault point by selecting a one-dimensional signal, performing wavelet transformation, solving a wavelet coefficient, detecting a modulus maximum point, sorting singular points after the maximum point, performing first-order difference operation and difference comparison, and performing localization operation on the cable fault position by using a single-end fault localization method free from influence of the wave velocity; and 4, synchronously outputting the treatment result. The method has the advantages of reasonable design, simple operation, convenient implementation and high localization precision, and effectively solves the practical problems that the fault region cannot be identified and the localization precision is relatively low and easily influenced by various factors in the conventional cable fault detection method.

Description

technical field [0001] The invention belongs to the technical field of cable fault distance measurement, in particular to a cable fault distance measurement method based on wavelet difference algorithm. Background technique [0002] Due to the increasingly complex structure of the power cable network and the influence of natural conditions, manufacturing quality, operation and maintenance, etc., there are more and more cable faults, and the impact of cable line accidents on society will become greater and greater. This is how to quickly and accurately There are higher requirements to realize the detection of cable faults. The power cable fault distance measuring device used in the field today is to untie the power cable after a power cable fault and power outage, and then measure the fault distance offline through related equipment. In the actual use process, the above-mentioned offline fault location method has many disadvantages, such as the distance measurement time is t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/02G01R31/08
Inventor 汪梅熊欣张小艳刘嫣曲立娜张俊乐周丹韩瑶瑶段金英李新燕王梨徐金华任青杨梁军张铮
Owner XIAN UNIV OF SCI & TECH
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