Power distribution network grounding fault processing method based on arc suppression coil parallel resistor

Abstract

The invention provides a power distribution network grounding fault processing method based on an arc suppression coil parallel resistor, and the method comprises the following steps: judging whether a single-phase short-circuit grounding fault occurs in a power distribution network is an intermittent fault or not; if the fault is not the intermittent fault, arc suppression is carried out through the arc suppression coil in the compensation time; if the fault of the power distribution network does not disappear after arc extinction, it is judged that a permanent fault occurs; when the intermittent fault or the permanent fault occurs in the power distribution network, estimating the transition resistance value of a fault point, and evaluating the reliability of a line selection result; and according to the transition resistance value of the fault point and the credibility of the line selection result, controlling the access of a parallel resistor of the arc suppression coil and the removal of the fault line. According to the method, faults can be eliminated sensitively, frequent tripping caused by instantaneous faults can be avoided, and therefore the operation reliability of a power distribution network system is greatly improved.

Description

technical field [0001] The invention relates to the technical field of power system distribution network grounding protection, in particular to a distribution network grounding fault processing method based on arc-suppression coil parallel resistance. Background technique [0002] The neutral point grounding methods mainly include non-grounding, resonant grounding, and small resistance grounding. The single-phase grounding fault handling strategy is limited by different grounding methods, and there are certain differences in the single-phase grounding fault handling methods of different grounding methods. In my country's 10kV distribution network, most of them adopt the method of resonant grounding, that is, the neutral point is grounded through the arc suppressing coil. At present, with the continuous development of the distribution network, more and more places adopt the small resistance grounding method. [0003] The grounding of the neutral point through the arc suppress...

AI Technical Summary

Problems solved by technology

However, the small resistance grounding method still has certain disadvantages. Once the zero-sequence current exceeds the set value, the faulty line will be cut off. When a transient fault occurs, it will inevitably cause frequent tripping of the line, which is often unnecessary. Make the system operation reliability is not high

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