Electrical power distribution network single-phase earth fault type and phase distinguishing method

Abstract

The invention discloses a distributing net single phase earth fault type and a distinguishing method of phase identification, relating to a distributing net single phase earth fault distinguishing method in the field of AC distributing net testing and relaying protection technology. According to the invention, through collecting three-phase voltage of the distributing net system and neutral pointvoltage of the distributing net system, phase angle of each eigenvector is computed through a special relation, the type of the fault and the phase identification can be fast distinguished through the phase angle distinguishing logic. The inventive working system is that a three-phase bus (000), a grounding transformer (100), a linear side of an arc suppression coil (200) are connected in turn with the earth; a controller (400), a thyristor (300) and a secondary side of an arc suppression coil (200) are connected in turn. The invention is simple in criterion, small in collection quantity, fast in distinguishing speed, high in accuracy, reliable in security, which is suitable for 3-66 KV distributing net based on an aerial line or a power cable.

Description

technical field [0001] The invention relates to a method for discriminating a single-phase ground fault in a distribution network in the technical field of AC distribution network testing and relay protection, in particular to a method for discriminating the type and phase of a single-phase ground fault in a distribution network, which is mainly used for Distinguish the types and phases of single-phase ground faults in 3-66kV power grid systems. Background technique [0002] At present, the domestic automatic arc suppression complete set of devices can only judge whether the power grid has a fault, but cannot accurately judge the specific type and specific phase of the fault, resulting in the rejection of the arc suppression coil or malfunction. Actions will have adverse effects on the distribution network system; and for power grid operation and maintenance personnel, when a ground fault occurs, because they do not know the type and phase of the fault, they can only judge a...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of existing identification methods that cannot accurately identify fault phases and types, and provide a single-phase ground fault type and phase identification method in a distribution network. The amount of simulation to be collected is small, and the calculation is simple. Can quickly and effectively identify the phase difference and type of single-phase ground fault

Images