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Power cable damage synchronous magnetic field directioning positioning method

A magnetic field orientation, power cable technology, applied in fault location, electrical/magnetic exploration, fault detection by pulse reflection method, etc., can solve problems such as insolvency, and achieve the effects of high positioning accuracy, convenient use and simple operation

Inactive Publication Date: 2008-08-13
山东博鸿电气股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method can only detect the fault point where the cable sheath is damaged. For the fault point of the cable laid in the pipe or tunnel, this method cannot solve the problem.

Method used

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  • Power cable damage synchronous magnetic field directioning positioning method
  • Power cable damage synchronous magnetic field directioning positioning method
  • Power cable damage synchronous magnetic field directioning positioning method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0049] For the detection of a single phase-to-ground fault of a 10Kv armored power cable, a 15Kv DC pulse voltage is applied between the faulty core wire of the cable and the steel armor, and the cable fault is clicked and discharged. The staff holds the magnetic induction coil and the magnetic field signal for processing and judgment. The magnetic field signal detecting device constituted by the display unit detects along the laying direction of the cable under test.

[0050] When the distance from the fault point is 5 meters, the magnetic field signal intensified in turn can be detected. At 0.5 meters away from the fault point, the signal strength (amplitude) reaches the highest, and then moves forward, the signal strength decreases significantly; to the fault point, the signal strength It is zero; continue to move forward, the polarity of the detected signal is reversed, and the amplitude change also has the characteristics of reaching the maximum at 0.5 meters from the faul...

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PUM

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Abstract

The present invention relates to a synchronous field directional locating method of power cable fault, belonging to the field of electric fault detection technology. It is characterized by that between fault core wire and steel armour of any end of fault cable a voltage pulse generator is set, and voltage pulse signal is periodically applied so as to make it produce a magnetic field signal which uses fault point as centre and produces change successively along the cable route near by fault point of fault cable; then a magnetic field signal detection device is used for making measurement of magnetic field signal polarity and signal amplitude along the fault cable route, and the detection of change of magnetic field signal polarity and signal amplitude can be used to define the direction of fault point and its concrete position.

Description

technical field [0001] The invention belongs to the field of detection of electrical faults, in particular to an orientation and location detection of a grounding fault point of an armored power cable. Background technique [0002] Cables used for power transmission and distribution are called power cables. [0003] With the progress of society and the development of industrial and agricultural production, the proportion of cable consumption in the entire power transmission line is increasing. Compared with overhead lines, cables have the following main advantages: [0004] 1. Good power supply quality, high reliability, not easily affected by the surrounding environment and pollution; [0005] 2. The insulation distance between lines is small, occupying less land, and no interference to radio waves; [0006] 3. When laying underground, it does not occupy the ground and space, which is safe and reliable, and it is not easy to expose the target. [0007] Considering the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/11G01V3/08
Inventor 王广柱彭丽芳张立斌
Owner 山东博鸿电气股份有限公司