Grounding line selecting and ground fault section positioning method for arc suppression coil

Abstract

The invention discloses a grounding line selecting and ground fault section positioning method for an arc suppression coil. According to the method, when a neutral point of a main transformer is grounded in a one-phase mode through the arc suppression coil, a residual current and displacement voltage are generated, and the residual current is an inductive current in the overcompensation process, is a capacitance current in the undercompensation process and is equal to zero in the full compensation process to form a ground fault line; after grounding line selecting, the ground fault section positioning method includes the steps that on a grounding line, a section switch which the residual current does not flow through detects i0 as the capacitance current, the reactive power is a positive value, and the section between the switch which the residual current flows through and an adjacent switch which the residual current does not flow through serves as a ground fault section; if the residual current is detected in one line, the residual current and the small ground capacitance current are not detected in other lines, at the moment the line with the residual current serves as the ground line, and the section with the residual current and the adjacent section with the small ground capacitance current serve as the ground fault sections.

Description

technical field [0001] The invention relates to a method for grounding line selection and grounding fault section positioning for an arc suppression coil in a 10KV (and 35KV) system. Background technique [0002] With the development of the urban power grid, especially the extensive use of power cables, the capacitive current of the line to the ground is increasing, and the arc formed by the capacitive current at the fault point cannot be extinguished by itself when the single-phase is grounded; at the same time, the overvoltage generated by the gap arc often enlarges the accident. Significantly reduces the reliability of the power system. For this reason, the 10KV overhead line or overhead line and cable hybrid network, on the neutral point of the main transformer, adopts the grounding method of the arc suppression coil to extinguish the arc. When one phase is grounded, the inductive current generated by the arc suppression coil is mixed with the ground current generated o...

AI Technical Summary

Problems solved by technology

[0006] The present invention proposes in view of the existing shortcomings, and provides a method for grounding line selection and grounding fault section positioning for arc suppression coils with convenient operation and low cost

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