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High-voltage cable trouble point checking method and its device

A technology of high-voltage cables and detection methods, applied in fault locations, information technology support systems, etc., can solve problems such as poor stability, and achieve the effects of low cost and easy portability

Inactive Publication Date: 2008-10-22
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the defects of high-voltage testing and poor stability in the current common cable fault point detection methods, the purpose of the present invention is to provide a high-voltage cable fault point detection method and its device with low voltage and high stability. convenient

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  • High-voltage cable trouble point checking method and its device
  • High-voltage cable trouble point checking method and its device
  • High-voltage cable trouble point checking method and its device

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Embodiment Construction

[0030] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0031] With reference to Fig. 3 and Fig. 4, first talk about the principle of the present invention, its basic principle is based on the characteristics that the cable is uniform along the line, the length of the cable is proportional to the resistance of the conductor core wire and the resistance of the shielded copper tape, and the normal conductor core of the faulty cable is used Line R S , Faulty conductor core wire R T (including R T1 and R T2 ) and shielding copper tape R G (including R G1 and R G2 ) as the measurement circuit, add an adjustable low-voltage DC power supply E to the measurement circuit d After that, the cable shield copper tape R G The pressure drop per meter is also equal. Utilize faulty conductor core wire R T As a measuring line, through the cable fault grounding resistance R f with shield co...

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Abstract

The invention relates to a method and a device for detecting a high-voltage cable fault point. The device comprises a low-voltage adjustable DC power connected with one end of the cable, a polarity convertor, a DC ammeter and a high internal resistance voltmeter, wherein, another high internal resistance voltmeter is connected with the other end of the cable. In the detecting process, the voltage value at two ends of the high internal resistance voltmeter is recorded by adjusting the DC current and the match of the polarity convertor with the DC ammeter, and the position of the cable fault point is calculated by related formula. The method adopts the low-voltage DC power supply detection and solves the problems of the prior cable that the high-resistor fault detection needs to adopt the high-voltage detection and various harms are caused. In addition, the device is convenient to carry and has low cost, stability and high accuracy.

Description

technical field [0001] The invention relates to cable detection in the field of equipment maintenance, and more specifically, to a method and device for detecting fault points of high-voltage cables. Background technique [0002] When detecting the distance to the fault point of a high-resistance power cable, the measurement method commonly used at present is to use high-voltage testing technology, mainly using the flashing method and the high-voltage bridge method, and the current domestic and foreign literature introduction and practical application are only It can be solved by using high-voltage bridge method to find high-resistance grounding faults. The wiring principle is shown in Figure 1. Due to the high resistance of the fault point, a high-voltage DC power supply must be used to ensure that the current passing through the fault point will not be too small. . The high-voltage bridge method is only suitable for stable high-resistance cable grounding faults, and is no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCY04S10/522Y04S10/52
Inventor 戴静旭潘永明曹蔚吉顾欢腾
Owner BAOSHAN IRON & STEEL CO LTD
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