A New Type of Small Current Grounding Line Selection System

Abstract

The invention discloses a novel small-current grounding line selection system which comprises sound sensitive sensors, a signal transmitting module and a computer monitoring terminal, wherein the sound sensitive sensors are correspondingly connected with the signal transmitting module; the signal transmitting module is provided with power supply equipment; the computer monitoring terminal is capable of receiving acquired signals transmitted from the signal transmitting module; the computer monitoring terminal comprises a data storage module, a data analysis module, a typical cable discharge sound spectrum module and an alarm module; the data storage module is capable of independently storing the acquired signals of each sound sensor in real time. By adopting the novel small-current grounding line selection system, as fault lines can be confirmed by collecting and analyzing single-phase grounding discharge sound, the fault line selection correct rate is greatly increased.

Description

technical field [0001] The invention relates to a novel small current grounding line selection system. Background technique [0002] With the development of the power grid, the proportion of power cables in the urban distribution network is getting higher and higher. Most of the single-phase ground faults of power cables are permanent faults, and it is necessary to judge and isolate the faulty cables in a short time to avoid large-scale cable group incidents. Cables are densely packed in substation outlet trenches and main cable channels. When a single-phase ground fault occurs on a certain line, if it cannot be quickly and accurately identified, it is likely to pose a threat to the surrounding adjacent lines, and then develop into a cable group damage event. The existing small current line selection system mainly includes the neutral point grounding method and the zero sequence current analysis method. The former is to contact the neutral point instantaneously after the gr...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem that the correct rate of line selection in the above-mentioned existing line selection system is not high, the present invention provides a new type of small current grounding line selection system, which determines the faulty line by collecting and analyzing the single-phase grounding discharge sound , greatly improving the correct rate of fault line selection

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