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 point voltage 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 distinguishing single-phase grounding faults in a distribution network in the technical field of AC distribution network testing and relay protection, and in particular to a method for distinguishing single-phase grounding fault types and phases in a distribution network, and is mainly used for Distinguish the type and phase of single-phase grounding faults in 3-66kV power grid systems. Background technique [0002] At present, the domestic automatic arc suppression complete set of equipment can only determine whether the power grid is faulty, but cannot accurately determine the specific type and phase of the fault, which causes the refusal or error of the arc suppression coil. Actions have an adverse effect on the distribution network system; and for the operation and maintenance personnel of the power grid, when a ground fault occurs, because they do not know the type and difference of the fault, they can usually only...

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

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