Distribution network single phase grounding fault detection system and method based on two-way automated communication

Abstract

The invention provides a distribution network single phase grounding fault detection system and a method based on two-way automated communication. The system comprises a main unit module and a plurality of sub unit modules, wherein the main unit module is in parallel connection with an upstream transformer and is arranged at the output end of the upstream transformer; the sub unit module is in parallel connection with the low-voltage side of a load transformer and a load branch; the main unit module is electrically connected with the sub unit module through a single-phase wire loop; the main unit module is used for receiving the distribution network voltage information, judging the phase with failure, generating disturbance voltage and receiving disturbance current fed back by the sub unitmodule; and the sub unit module is used for receiving the disturbance voltage generated by the main unit module and feeding back the disturbance current. According to the distribution network singlephase grounding fault detection system and the method based on two-way automated communication, an SWER technology is used to realize information communication between the main unit and the sub unit,and detection and judgment on a single phase grounding fault position can be realized more conveniently and quickly.

Description

technical field [0001] The present application relates to the technical field of single-phase ground fault detection of distribution network, in particular to a system and method for single-phase ground fault detection of distribution network based on two-way automatic communication. Background technique [0002] The medium-voltage distribution network at home and abroad widely adopts the neutral point ungrounded or arc suppression coil grounded operation mode. Compared with the high-voltage transmission network, the medium-voltage distribution network has a high probability of failure, and single-phase ground faults occur frequently. Single-phase ground fault refers to the insulation damage between the distribution network conductor and the ground, which mostly occurs in humid and rainy weather. Single-phase ground fault affects the normal power supply of users, and may cause overvoltage, burn out equipment, and even cause phase-to-phase short circuit and expand the acciden...

AI Technical Summary

Problems solved by technology

The signal injection method generally uses the signal injection device to inject a specific current signal into the system through the bus PT. In the general AC signal injection method, the injection signal is limited by the capacity of the PT and the distributed capacitance will affect the shunting of the injection signal, which may easily lead to the failure of fault point location.

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