Self-adaptive neutral point grounding device and method for 3kV-66kV power distribution system

Abstract

The invention relates to a self-adaptive neutral point grounding device and method for a 3kV-66kV power distribution system. The invention aims to solve the technical problem that the neutral point grounding mode of the existing power distribution system is difficult to have high reliability and high-sensitivity protection characteristics at the same time. The grounding device comprises a high-speed switch, a first resistor and a second resistor, the first resistor and the second resistor are connected in series, the other end of the first resistor is connected with a system neutral point, the other end of the second resistor is grounded, and the high-speed switch is connected with the first resistor in parallel; the resistance value of the first resistor is greater than that of the second resistor; and the action voltage of the quick switch is greater than the voltage to ground. According to the grounding method, when the system has a grounding fault and the voltage drift of the neutral point exceeds the action voltage of the high-speed switch, the high-speed switch is switched on, so that the neutral point of the system is grounded through the second resistor.

Description

technical field [0001] The invention relates to an adaptive neutral point grounding device, in particular to an adaptive neutral point grounding device and a grounding method for a 3kV-66kV power distribution system. Background technique [0002] The existing neutral point grounding methods of 3kV-66kV power distribution system are mainly divided into two categories: non-effective grounding and effective grounding. These two methods are independent of each other and cannot be converted. Non-effective grounding includes two grounding methods: non-grounding and grounding through arc suppression coil; effective grounding adopts small resistance grounding method. my country's power distribution system mainly adopts non-effective grounding methods. The neutral point grounding method is different, the overvoltage and insulation level of the system will be very different, which will greatly affect the power supply reliability of the system, overvoltage and insulation coordination,...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problem that it is difficult to have both high reliability and high sensitivity protection characteristics in the neutral point grounding mode of the existing power distribution system, and to provide an adaptive neutral point grounding device for 3kV-66kV power distribution system and grounding method

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