On-line fault distance measurement method for high-voltage cable

A technology for fault location and high-voltage cables, which is applied in the direction of fault location, measuring electricity, and measuring devices, and can solve the problems of not considering the influence of traveling wave velocity of cable operating parameters and low ranging accuracy

Active Publication Date: 2016-02-24
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

Traditional online ranging algorithms for high-voltage cables generally assume that the propagation velocity of traveling waves in the cable is constant, without consid

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  • On-line fault distance measurement method for high-voltage cable
  • On-line fault distance measurement method for high-voltage cable
  • On-line fault distance measurement method for high-voltage cable

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[0085] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0086] Such as figure 1 As shown, a high-voltage cable online fault location method includes the following steps:

[0087] (1) Signal acquisition: Collect transient traveling wave current signals at the beginning and end of the cable;

[0088] (2) Phase-to-mode conversion: The current signal in step (1) is converted into 6 mutually independent modulus current signals i through phase-to-mode conversion 1 ~i 6 ;

[0089] (3) Decomposition and reconstruction of transient traveling wave: select the modulus current signal i in step (2) 4 Perform wavelet packet decomposition, use wavelet packet decomposition coefficients to find the energy ratio of each frequency band, and then extract the energy percentage> 5% of the frequency band, reconstruct the transient traveling wave; through the decomposition and reconstruction of the transient traveling wave, the bandwidth of th...

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Abstract

The invention relates to an on-line fault distance measurement method for a high-voltage cable, and the method comprises the steps: (1) collecting transient traveling wave current signals at the head and tail ends of a cable; (2) enabling the current signals obtained at step (1) to be converted into independent analog current signals i1-i6 through phase-mode transformation; (3) selecting the analog current signal i4 at step (2) for wavelet packet decomposition, solving an energy ratio of all frequency bands through employing a wavelet packet decomposition coefficient, then extracting the frequency band with the high energy ratio, and reconfiguring a transient traveling wave; (4) carrying out the wavelet analysis of the configured transient traveling wave at step (3), and determining the time t1 and T1 when the configured transient traveling wave arrives at the head and tail ends of the cable; (5) judging a fault region according to the time t1 and T1 at step (4), and solving a geographic distance from a fault point to the head end of the cable. Compared with the prior art, the method is high in distance measurement precision, and is few in interference.

Description

technical field [0001] The invention relates to a cable fault distance measurement method, in particular to a high-voltage cable online fault distance measurement method. Background technique [0002] Power cables are generally buried underground, and it is difficult to accurately locate and repair faults. Faults occurring in cable lines usually cause major economic losses. Research on fast and accurate cable fault location methods can help reduce fault line inspection time, repair faults as soon as possible, and reduce economic losses caused by power outages. It is of great significance to ensure the reliability of power supply in urban power grids. [0003] Cable fault location methods are usually divided into offline distance measurement method and online distance measurement method. The online distance measurement method is not yet mature, and the offline fault distance meter is generally used at present. Since the charging current of high-voltage cables is relatively l...

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/088
Inventor 唐忠杨建
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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