Fault line selection method and device for earth neutral system

Abstract

The embodiment of the invention discloses a fault line selection method and a device thereof for an earth neutral system, wherein the fault line selection method for the earth neutral system comprises the following steps: by using current transformers which are respectively arranged on each feeder line in at least one group of feeder lines to be monitored in the earth neutral system, acquiring induced current of the current on each feeder line in the at least one group of feeder lines to be monitored, wherein, each group of feeder lines to be monitored in the earth neutral system comprise three feeder lines respectively connected to three phases of output of the earth neutral system; respectively analyzing the components of the acquired induced current of the current on each feeder line; and indicating the corresponding feeder line containing resistive current in the current components of the analyzed induced current as an earth fault feeder line. The technical scheme of the inventioncan select the feeder line with earth fault in the earth neutral system relatively quickly and accurately, thereby being favorable to immediate repair and reducing the occurrence probability of accident.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a fault line selection method and device for a neutral point grounding system. Background technique [0002] At present, the neutral point of distribution network widely adopts high resistance grounding technology. The study found that purposely connecting high resistance in the neutral point grounding system, limiting the ground fault current to 10A or below, can make the system current continue to flow for a period of time without aggravating the damage of the equipment. [0003] For example, the most common fault in a small-current neutral point grounding system is usually single-phase grounding. Practice has proved that although a short-term single-phase grounding fault will not destroy the symmetrical operation of the entire neutral point grounding system, if it cannot be found in time And deal with the single-phase ground fault, it is very easy to develop into a more s...

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Problems solved by technology

[0003] For example, the most common fault in a small-current neutral point grounding system is usually single-phase grounding. Practice has proved that although a short-term single-phase grounding fault will not destroy the symmetrical operation of the entire neutral point grounding system, if it cannot be found in time And deal with the single-phase ground fault, it is very easy to develop into a more serious short-circuit fault, and may even cause a major accident

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