Switching and withdrawing control system and method of arc suppressing coil parallel connection low resistance grounding device

Abstract

The invention discloses a switching control system for an arc suppression coil parallel connection low resistance grounding device, comprising: a neutral point zero-sequence voltage monitoring and analysis module, a voltage transformer, a grounding transformer, an arc suppression coil, a low resistance grounding resistor, Resistor switching switch and damping resistance control module; grounding transformer neutral point is connected with voltage transformer, arc suppressing coil, resistor switching switch; neutral point zero-sequence voltage monitoring and analysis module is connected with voltage transformer and damping resistance The control module and resistor switching switch are connected to monitor the neutral point voltage amplitude of the grounding transformer, and analyze the fault conditions of the grounding transformer and outgoing lines according to the neutral point voltage amplitude to control the resistor switching switch and damping resistance control module work. The invention also discloses a switch-on / off control method of an arc-suppression coil parallel-connected low-resistance grounding device, which greatly improves the safety and reliability of the power supply of the distribution network, and has the characteristics of simplicity, reliability and high feasibility.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a system and method for switching on and off of an arc-suppression coil parallel-connected low-resistance grounding device. Background technique [0002] In the power system, the neutral point grounding method is selected according to the insulation level of the grid equipment and the size of the capacitor current. For the distribution network dominated by overhead lines, the neutral point is generally grounded through the arc suppression coil; for the urban distribution network dominated by cable lines, the single-phase ground fault capacitor current is large, and the neutral point is usually used. Grounded via a small resistor. However, the grounding method of the neutral point through the arc suppression coil brings certain difficulties to the permanent fault line selection, and it is difficult to quickly and accurately remove the fault; the grounding method of the ne...

AI Technical Summary

Problems solved by technology

However, the grounding method of the neutral point through the arc suppressing coil brings certain difficulties to the permanent fault line selection, and it is difficult to quickly and accurately remove the fault; the grounding method of the neutral point through a small resistance cannot distinguish between an instantaneous ground fault and a permanent ground fault. Start line tripping for all single-phase grounding, which increases the number of line tripping and affects the reliability of power supply

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