Single-phase earth fault solving method based on multi-tap arc suppression coil

Abstract

The application relates to the power system single-phase earth fault protection technical field, and especially relates to a single-phase earth fault solving method based on a multi-tap arc suppression coil; the method comprises the following steps: enabling the multi-tap arc suppression coil to output an induction current if the single-phase earth fault is not an immediacy fault, and compensatinga capacitive current of the power system; in addition, starting reversed polarity winding work, and enabling the multi-tap arc suppression coil to enter an excessive compensation state; setting tapsof the inputted reversed polarity winding according to the power system requirements; determining a phase and selecting a line for the single-phase earth fault; enabling the reversed polarity windingto be in a bypass state, and enabling the multi-tap arc suppression coil to process the single-phase earth fault; enabling the multi-tap arc suppression coil to enter a waiting state when the single-phase earth fault is processed, and allowing the power system to restore normal operation. The method can enable the induction current formed by the multi-tap arc suppression coil to form disturbances,thus realizing the earth fault phase determination and line selection function.

Description

technical field [0001] The present application relates to the technical field of single-phase ground fault protection in power systems, in particular to a method for solving single-phase ground faults based on a turn-adjusting arc suppression coil. Background technique [0002] The arc-suppression coil is connected between the neutral point of the power grid and the ground grid. When a single-phase ground fault occurs in the power system, the fault point flows through a capacitive current, and the arc-suppression coil provides inductive current to compensate, so that the current at the fault point drops below 10A , It is beneficial to prevent the arc from re-igniting after zero crossing, achieve the purpose of arc extinguishing, reduce the probability of high-amplitude overvoltage, prevent further expansion of accidents, and improve the reliability of power system operation. [0003] With the wide application of power cables, the capacitive current of the distribution networ...

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Problems solved by technology

[0005] This application provides a method for solving a single-phase ground fault based on a turn-adjustable arc suppression coil, in order to solve the problem that the inductive current generated by the arc suppression coil cannot overcompensate the capacitive current of the power system, and the phase judgment and selection of the ground fault cannot be accurately performed line problem

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