Failure cable current application method and noise-free hand-held type cable failure positioning instrument

Abstract

The invention discloses a current application method of fault cables and a noise-free handheld cable fault fixed instrument. The method is that the front and rear current of the fault point is in the same direction when the high-voltage pulse is added to the fault cable; when the high-voltage pulse is over, the front and rear current of the fault point is in the opposite direction because of the fault point; thereby, the electromagnetic field changes caused by the direction change of the front and rear current of the fault point are detected as the front and rear current of the fault point is in the opposite direction and the fixed instrument is used to determine the fixed position of the fault point. The signal issued by an electromagnetic detection probe is sent to a regulating circuit and a A / D converter circuit; the signal issued by another electromagnetic detection is sent into another regulating circuit and another A / D converter circuit, then processed in a re-entry device and a microprocessor to a display; the microprocessor is also connected with a clock circuit and a keyboard circuit. The invention has the advantages of simple structure, convenient use, low cost and no influence of environmental noises from the scene when fixing. The invention can check the cable path when fixing and be used as the host for fault pre-positioning after expanding the software, thus achieving multi-function integration.

Description

technical field [0001] The invention relates to a high-voltage and low-voltage cable fault point detection instrument device, in particular to an application method of faulty cable current and a noiseless hand-held cable fault point detector. Background technique [0002] With the rapid development of urban construction, a large number of overhead power lines have been changed to buried power cables in order to beautify the environment, which has caused a rapid increase in the use of power cables, and a large number of cable faults have occurred due to frequent construction and other reasons. Quickly and accurately Finding the fault point of the underground cable has become a difficult problem for cable repair and restoration of power transmission. [0003] The traditional acoustic measurement method, the currently popular acoustic and magnetic synchronous acoustic measurement method, the acoustomagnetic time difference method, and the acoustomagnetic waveform time differenc...

AI Technical Summary

Problems solved by technology

[0003] The traditional acoustic measurement method, the currently popular acoustic and magnetic synchronous acoustic measurement method, the acoustomagnetic time difference method, and the acoustomagnetic waveform time difference method, all of the devices used in these detection methods are susceptible to fixed-point site noise interference and are difficult to detect when the field interference is large. Defects that work effectively

[0004] Another step voltage method is limited because it can only be used for the fixed point of the ground fault

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