Portable intelligent DC earthing searching instrument

Abstract

A portable intelligent DC grounding finder, relating to the field of testing short circuit, broken circuit, leakage or incorrect connection on electric instrument, lines or elements, and detecting the failure in cables, transmission lines or networks. The invention is composed of a hand-held set with a converted DC clip style meter and a DC insulation monitor base. The invention uses the clip style meter to correctly find the grounded DC lines and furthermore looks up the specific grounding points of instrument, and correctly finds out the grounding point without DC, even if eliminates the grounding failure under the condition wherein field conditions are allowable, thereby avoiding inconvenience of changing operation modes, revising fixed values and long working time for looking when applying power failure in the work program for finding the grounding, fast and correctly finding the grounding point, which is suitable for testing the short circuit, the broken circuit, leakage or incorrect connection on the electric instrument, the lines and the elements, and detecting the failure in the cables, the transmission lines or the networks.

Description

technical field [0001] A portable intelligent DC grounding finder, which relates to the field of electrical performance testing devices and electrical fault detection devices, specifically relates to a test for short circuit, open circuit, leakage or incorrect connection of electrical equipment, lines or components, and for detecting cables, An area of ​​fault in a transmission line or network. Background technique [0002] At present, the relay protection DC power supply system of the substation adopts a suspended state, and neither the positive nor the negative power supply is grounded. If an insulation problem occurs during operation and the DC positive or negative pole is grounded, generally there will be no immediate consequences, but if it is not handled in time, another point will occur. The consequences of the grounding of the DC system are very serious, so when the DC grounding occurs, the grounding fault point should be eliminated immediately. However, due to the c...

AI Technical Summary

Problems solved by technology

[0009]Second, after some old substations are DC grounded, it is difficult to figure out the nature of the DC load and the specific direction of the line due to the long history and intricate distribution of DC lines after improvement. When the DC power supply is judged to be grounded, the relay protection will cause misoperation. The lessons of history have made dispatching, on-duty, and relay protection staff very cautious about pulling the DC power supply of the protection equipment, especially in the current situation of tight power supply. A Safe and Convenient DC Ground Detection Method

[0010]Third, when it is judged that a certain equipment is grounded, the device must be disabled to check the equipment in the end, and the DC grounding point cannot be finally located;

[0011] Fourth, the branch circuit detection does not work normally or the insulation is good so that the branch circuit detection fault cannot be found during operation. When the branch circuit is grounded, there is a problem with the branch circuit detection and needs Additional DC ground detector to find ground branch

[0012] Fifth, the current portable ground finder has poor capacitive interference resistance and stability, and cannot reliably determine the ground fault. The experience of mastering and finding grounding greatly affects the success rate of finding grounding points

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