Multi-loop line grounding fault line selection method based on arc suppression coil accurate compensation

Abstract

The invention provides a multi-loop line grounding fault line selection method based on arc suppression coil accurate compensation, and the method comprises the steps: 1, collecting a neutral point voltage signal, and carrying out the sampling of each line for a plurality of times in a preset time period from the grounding fault occurrence moment; 2, comparing the neutral point voltage signal with a set value, and judging that a grounding fault occurs when the absolute value of the neutral point voltage signal is greater than the set value; 3, compensating a grounding fault through the phase-controlled arc suppression coil; step 4, collecting data of each line at a grounding fault moment; 5, longitudinally calculating feeder polarity characteristic values, and accumulating the characteristic values; and step 6, sorting the feeders according to a characteristic value decreasing rule, and selecting a line with a positive characteristic value as a fault line. According to the line selection algorithm, the transient data and the steady data are combined for comprehensive line selection, all the transient data are fully utilized, the line selection problem of intermittent grounding faults is successfully solved, and the line judgment accuracy is improved to 90% or above from original 70-80%.

Description

technical field [0001] The invention relates to the field of power system distribution network protection, in particular to a multi-circuit line grounding fault line selection method based on accurate compensation of arc suppression coils. Background technique [0002] The single tower (pole) multi-circuit arrangement is widely used in the distribution network, which helps to save land resources. At the same time, the occurrence of single-circuit faults developing into multi-circuit faults is increasing, which not only reduces the reliability of power supply for users , but also to the power supply enterprises to bring a huge negative impact. After the ground fault occurs in the distribution network, the ground current is the capacitive current of the system, and a small current loop is formed through the ground capacitor, which will not cause excessive damage to the equipment and system, and will not affect the continuous power supply in a short period of time. However, du...

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Problems solved by technology

[0004] The present invention proposes a method to achieve precise compensation through phase-controlled arc suppression coils, minimize fault current, make full use of all transient data, overcome the shortcomings of traditional transient algorithms, and successfully solve the problem of line selection for intermittent ground faults. Method of Line Selection for Grounding Fault of Loop Circuit

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