Wavelet difference algorithm-based cable fault localization method

A technology of cable fault and differential algorithm, which is applied in the direction of fault location, measuring device, and electrical device, etc., which can solve the problems of inability to identify the fault area and low ranging accuracy

Inactive Publication Date: 2012-05-23
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 2 As shown, a cable fault location method based on wavelet difference algorithm according to the present invention includes the following steps:

[0052] Step 1. Real-time signal detection and synchronous upload: The current detection unit 1 detects the ABC three-phase current at the beginning of the three-phase cable under test in real time, and then 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 three voltage signals u obtained after the I / V conversion are correspondingly obtained 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 that respectively detect the ABC three-phase current at the beginning of the three-phase cable under test in real time, and the current trans...

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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 location, and particularly relates to a cable fault location method based on a wavelet differential 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, and more and more cable failures, the impact of cable line accidents on the society will become greater and greater. This has an impact on how to quickly and accurately There are higher requirements for the detection of cable faults. Nowadays, the power cable fault location device used in the field is to untie the power cable after the power cable fails and then measure the fault distance offline through related equipment. In actual use, the above offline fault location method has many drawbacks. For example, the distance measurement time is too long. A considerable part of the faults that occur in the...

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Application Information

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Patent Type & Authority Patents(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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