Single-phase earth fault arc extinguishing device for power distribution network

Abstract

The invention relates to a single-phase earth fault arc extinction device for a power distribution network, which comprises a central control module, a fault judgment module, a grounding transformer module, an injection transformer module, a voltage detection module, a circuit breaker and a zero sequence current detection module, the grounding transformer module is connected with the injection transformer module through a transformer switch, and the structure is simple. According to the single-phase earth fault arc extinguishing device for the power distribution network, the three-phase voltage and the zero-sequence current of the power distribution network are obtained through the voltage detection module and the zero-sequence current detection module, the fault judgment module judges according to the three-phase voltage detected by the voltage detection module to obtain the earth fault of the power distribution network, and the central control module controls the on-off of the transformer and the closing of the circuit breaker. Full compensation of fault current is realized, reignition of fault arc is avoided, and the technical problems that an existing arc extinguishing device is complex in control structure and mode, needs to depend on the precision of parameter measurement of a power distribution network and cannot completely realize full compensation of grounding fault current are solved.

Description

technical field [0001] The invention relates to the technical field of ground faults in distribution network systems, in particular to a single-phase ground fault arc suppression device for distribution networks. Background technique [0002] The distribution network goes deep into the densely populated area of ​​the user terminal. In the densely populated area, the operation mode and operating environment of the distribution network are complex and changeable. Therefore, more than 90% of the faults in the distribution network are single-phase ground faults. . [0003] At present, the distribution network widely adopts neutral point non-effective grounding operation modes such as neutral point grounding through arc suppression coil and small resistance grounding to limit the ground fault current. However, with the large increase of cable network and the large number of nonlinear loads and power electronic equipment, the fault current contains a large number of active compon...

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a single-phase ground fault arc suppression device for distribution network, which is used to solve the problem that the existing arc suppression device has a complex control structure and method, which needs to rely on the accuracy of distribution network parameter measurement, and cannot fully realize the full range of ground fault current. Compensation for technical issues

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