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Fault on-line monitoring and real-time distance measurement method for armored power cable

A power cable and fault technology, applied in the field of power cable fault detection, can solve the problems of lack of online monitoring and real-time ranging of power cables, so as to improve the efficiency of fault detection and ranging, simplify equipment complexity and operation complexity, The effect of reducing operational complexity

Inactive Publication Date: 2013-07-24
PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for on-line monitoring and ranging of armored power cable faults, which is used to solve the problem that current power cable faults lack effective online monitoring and real-time ranging technical means

Method used

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  • Fault on-line monitoring and real-time distance measurement method for armored power cable
  • Fault on-line monitoring and real-time distance measurement method for armored power cable

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Embodiment Construction

[0024] The present invention will be described in detail below through embodiments in conjunction with the accompanying drawings.

[0025] Such as figure 1 As shown, a traveling wave pulse signal s is applied and emitted between the armor layer 4 and the earth at the measuring end A of the cable, and the traveling wave pulse signal travels along the cable in the traveling wave transmission system formed between the armor layer 4 and the earth. Propagate in the direction of transmission, and set a matching load R between the armor layer of the other end B of the cable and the ground, and the matching load matches the characteristic impedance of the traveling wave transmission system, thereby forming a loop between the armor layer and the ground. When the transmitted traveling wave pulse signal s encounters the fault point P of the cable, the reflected traveling wave signal r is transmitted to the measuring terminal A in the opposite direction. Wherein, the cable includes an ou...

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Abstract

The invention discloses a fault on-line monitoring and real-time distance measurement method for an armored power cable. Cable fault distance measurement is carried out through a return circuit formed by a cable armored layer and the ground. Due to the fact that no direct electric connection exits between a distance measurement system and a core wire of the high-voltage cable, safety and reliability are achieved, and the normal power transmission task of the cable is not affected in the working process. According to the fault on-line monitoring and real-time distance measurement method for the armored power cable, through the return circuit formed by the cable armored layer and the ground, distance measurement of a cable fault point is carried out through the wavelet analysis technology, two functions of on-line monitoring and real-time distance measurement of the cable fault are achieved, the complexity of equipment and the complexity of the operation are simplified, the fault detection efficiency and distance measurement efficiency are improved, the technical problem that the power cable fault is generally short of an effective on-line monitoring and real-time distance measurement method is resolved, the two functions of fault detection and fault distance measurement are combined, the complexity and cost of the equipment are lowered, the complexity of the operation is reduced, and the fault detection efficiency and distance measurement efficiency are improved.

Description

technical field [0001] The invention relates to a detection method for a power cable fault, in particular to a method for on-line monitoring and real-time distance measurement of an armored power cable fault. Background technique [0002] With the development of urban construction, the laying method of distribution network lines gradually transitions from the bare wire overhead type to the underground cable laying. Comparing overhead lines and underground cable lines, although the two have similarities in fault location, there are also obvious differences. In particular, underground cables are mostly used for medium and low-voltage power transmission, and their lengths are relatively short, and their faults cannot be observed. If the results of fault distance measurement differ by hundreds of meters, the value of distance measurement has been lost; moreover, underground cables are difficult to repair. Inaccurate fault location will cause a lot of waste of manpower, material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G01R31/08G01S13/08
Inventor 谭云华闫淑辉
Owner PEKING UNIV
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