On-off control system and method for arc suppression coil parallel low-resistance grounding device

Abstract

The invention discloses an on-off control system of an arc suppression coil parallel low-resistance grounding device. The on-off control system comprises a neutral point zero-sequence voltage monitoring and analyzing module, a voltage transformer, a grounding transformer, an arc suppression coil, a low-resistance grounding resistor, a resistor fling-cut switch and a damping resistor control module. The neutral point of the grounding transformer is connected with the voltage transformer, the arc suppression coil and the resistor fling-cut switch; and the neutral point zero-sequence voltage monitoring and analyzing module is connected with the voltage transformer, the damping resistance control module and the resistor fling-cut switch and is used for monitoring the neutral point voltage amplitude of the grounding transformer and analyzing the fault conditions of the grounding transformer and the outgoing line according to the neutral point voltage amplitude so as to control the work of the resistor fling-cut switch and the damping resistance control module. The invention further discloses an on-off control method of the arc suppression coil parallel low-resistance grounding device, the power supply safety and reliability of the power distribution network are greatly improved, and the method has the advantages of being simple, reliable and high in 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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