Ground fault location method and device for power distribution network based on wide-area synchronization

Abstract

The invention discloses a ground fault location method and device for a power distribution network based on wide-area synchronization, and relates to the technical field of fault diagnosis for electric power systems. The method comprises the following steps that the transaction time of zero sequence voltage of the bus side is acquired according to voltage transaction of the bus side; the transaction time of zero sequence voltage at the tail end of a line is acquired according to voltage transaction at the tail end of the line; a fault position is determined according to the transaction time ofthe zero sequence voltage of the bus side and the transaction time of the zero sequence voltage at the tail end of the line. According to the technical scheme, the conditions of misoperation and operation failures of a sensor can be avoided, the equipment reliability is improved, the voltage waveform with wave recording can be transmitted back to a bus side edge agent module through zero sequencevoltage monitoring modules at the tail ends of all outgoing lines, and accurate fault point location is achieved.

Description

technical field [0001] The invention relates to the technical field of power system fault diagnosis, in particular to a wide-area synchronization-based distribution network grounding fault location method and device. Background technique [0002] The 10kV power grid system is a small-current grounding system, especially the arc-suppression coil compensation grounding system. After single-phase grounding, the steady-state fault characteristics are not obvious, and the conventional algorithm cannot be selected accurately. The algorithm that can accurately obtain the transient characteristic quantity is realized. It is difficult to get up. If the ground fault occurs on the distribution line and cannot be cut off for a long time, after the distribution line falls to the ground, it is easy to endanger the passing pedestrians due to step voltage or contact voltage. Moreover, when the grounding current exceeds a certain range, the arc is difficult to extinguish by itself, and it i...

AI Technical Summary

Problems solved by technology

However, due to factors such as the design of the fault indicator itself, the manufacturing quality of the manufacturer, and the on-site environment, there are problems such as indicator misoperation, refusal to operate, inability to capture transient information with high precision, and out-of-synchronization of recorded wave data, which lead to fault location and failure of the fault indicator. Inaccurate research and judgment brings a lot of inconvenience to fault isolation and emergency repair work

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