A single-phase ground fault arc suppression device for distribution network

Abstract

The invention relates to a single-phase grounding fault arc suppression device for a distribution network, comprising a central control module, a fault discrimination 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 and The injection transformer modules are connected through transformer switches, and the structure is simple. The single-phase ground fault arc suppression device of the distribution network adopts the voltage detection module and zero-sequence current detection to obtain the three-phase voltage and zero-sequence current of the distribution network, and the fault discrimination module judges the distribution network according to the three-phase voltage detected by the voltage detection module When a ground fault occurs in the power grid, the central control module controls the transformer switch and the circuit breaker to close to realize full compensation of the fault current and avoid the re-ignition of the fault arc. The accuracy of parameter measurement cannot fully realize the technical problem of full compensation of ground fault current.

Description

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

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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