Control method of randomly-adjusting arc suppression coil and route selection device

Abstract

The invention discloses a randomly-adjusting arc suppression coil and a route selection device. The turning-off degree of the randomly-adjusting arc suppression coil is adjusted in two steps. When a grid system operates normally, the turning-off degree of the randomly-adjusting arc suppression coil is preadjusted to 20-80% in advance. After a grounding fault of the grid system occurs, the turning-off degree of the randomly-adjusting arc suppression coil is adjusted once again. After the grounding fault of the grid system occurs, the response time of the randomly-adjusting arc suppression coil is shortened, the problem of high overvoltage level caused by slow response time of a randomly-adjusting arc suppression coil device is avoided, and breakdown or damages of certain equipment and weak insulation caused by high overvoltage level are further avoided. Meanwhile, mid-value resistance is utilized to complete fault route selection, successful route selection is ensured, and power distribution reliability is increased. The current randomly-adjusting coil can be utilized without reformation, and the cost is low.

Description

technical field [0001] The invention relates to the field of electrical technology, in particular to a control method for a self-tuning arc suppressing coil and a line selection device. Background technique [0002] When a single-phase ground fault occurs in the neutral point of the distribution network via the adjustable arc suppression coil grounding system, although the adjustable arc suppression coil can well compensate the residual current at the fault point to achieve the purpose of arc extinguishing; The arc coil has a device response time (generally greater than 2 power frequency cycles). Studies have shown that when the response time of the adjustable arc suppression coil device exceeds 2 power frequency cycles, it has no inhibitory effect on various overvoltage levels, and the compensation effect of the adjustable arc suppression coil causes the residual current at the fault point to be very small. This will not be conducive to fault line selection. The usual zer...

AI Technical Summary

Problems solved by technology

[0002] When a single-phase ground fault occurs in the neutral point of the distribution network via the adjustable arc suppression coil grounding system, although the adjustable arc suppression coil can well compensate the residual current at the fault point to achieve the purpose of arc extinguishing; Arc coil existence device response time (generally greater than 2 power frequency cycles)

Studies have shown that when the response time of the adjustable arc suppression coil device exceeds 2 power frequency cycles, it has no inhibitory effect on various overvoltage levels, and the compensation effect of the adjustable arc suppression coil causes the residual current at the fault point to be very small. This will be detrimental to fault line selection

The usual zero-sequence current ratio-amplitude-phase method will no longer be applicable to the grounding system of the arc-suppression coil with adjustment. Defects, reducing the power supply reliability of the grid system

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