Tuning method of following-setting-type arc suppression coil of power distribution network system and fault line selection method

Abstract

The invention provides a tuning method of a following-setting-type arc suppression coil of a power distribution network system and a fault line selection method. When the system normally operates, the following-setting-type arc suppression coil tracks changes of a power distribution network in real time, capacitive currents of the system are accurately measured, the capacity of the arc suppression coil is adjusted to be in the off-tuning degree of 40% according to the capacitive currents, and the arc suppression coil is under an under-compensation state. When a single-phase earth fault is detected, after time window delay for 100 ms, namely five power frequency cyclic waves, the capacity of the arc suppression coil is adjusted to an overcompensation state so as to control grounded residual currents to be under 5A. In a time window undergoing 100 ms delay adjustment, by means of arc suppression coil under-compensation characteristics, firstly four outgoing lines with the largest fundamental wave zero-sequence current amplitude are selected, then phases of the fundamental wave zero-sequence currents of the four outgoing lines are compared, and the outgoing line opposite to the other three outgoing lines is a grounded fault line. The tuning method can effectively overcome the defects that an existing following-setting-type arc suppression coil is slow in response time, high in overvoltage level and low in accuracy of fault line selection.

Description

technical field [0001] The invention relates to the technical field of power system power distribution, and more specifically relates to a tuning method and a fault line selection method of a self-tuning arc suppression coil, which is suitable for a neutral point of a distribution network via a self-tuning arc suppression coil grounding system. Background technique [0002] At present, the adjustable arc suppressing coil is more and more widely used in the distribution network. The adjustable arc suppression coil can monitor the system capacitor current in real time and set compensation parameters. When the system is in normal operation, the arc suppression coil operates at a position far away from the resonance point. When the system is single-phase grounded, the reactor is quickly adjusted to the pre-fault setting The specified parameters are used to compensate the capacitor current. When the system is running normally, the impedance of the adjusted arc suppression coil i...

AI Technical Summary

Problems solved by technology

[0004] In view of the shortcomings of the existing adjustable arc suppression coil, a new tuning method and fault line selection method for the adjustable arc suppression coil of the distribution network system are proposed, which not only solves the problem of slow response time of the traditional adjustable arc suppression coil, The problem of high overvoltage level, and overcome the shortcomings of the existing fault line selection method with low accuracy

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