Single-phase grounding fault research and judgment method and system in transient zero-sequence power direction

Abstract

The invention relates to the field of single-phase grounding fault detection, and discloses a single-phase grounding fault research and judgment method and system in a transient zero-sequence power direction. The method comprises the following steps: S1, presetting delay time of a detection node; S2, obtaining a corresponding transient zero-sequence power direction; S3, judging whether a transient zero-sequence power direction of a detection node is inconsistent with a preset power direction or not; S4, acquiring delay time corresponding to all the detection nodes consistent with the preset power direction, and determining the minimum delay time and the corresponding detection nodes; and S5, starting timing till that the minimum delay time is reached, and enabling the power distribution equipment on the corresponding detection node to be switched on or switched off or sending out a fault alarm. The technical scheme of the invention has the beneficial effects that the single-phase grounding fault research and judgment method and system in the transient zero-sequence power direction are provided, a single-phase grounding fault can be discovered in time, and the fault can be isolated quickly.

Description

technical field [0001] The invention relates to the field of single-phase ground fault detection, and discloses a method and system for studying and judging single-phase ground faults in the direction of transient zero-sequence power. Background technique [0002] When the distribution network supplies power, it is easily affected by line faults and cause distribution faults. Line faults are often divided into short-circuit faults and single-phase ground faults. Compared with short-circuit faults, it is easier to judge and remove them. The proportion of single-phase ground faults is high and Due to the inconspicuous electrical characteristics of the fault, it is difficult to judge, and some single-phase ground faults may further deteriorate into short-circuit faults. [0003] At present, the judgment of single-phase ground fault often collects characteristic quantities such as phase sequence / zero sequence current and voltage, and analyzes the fault waveform, disturbance wave...

AI Technical Summary

Problems solved by technology

[0002] When the distribution network supplies power, it is easily affected by line faults and cause distribution faults. Line faults are often divided into short-circuit faults and single-phase ground faults. Compared with short-circuit faults, it is easier to judge and remove them. The proportion of single-phase ground faults is high and It is difficult to judge due to the inconspicuous electrical characteristics of the fault, and some single-phase ground faults may further deteriorate into short-circuit faults

[0003] At present, the judgment of single-phase ground fault often collects characteristic quantities such as phase sequence / zero sequence current and voltage, and analyzes the fault waveform, disturbance waveform and related characteristics among independent information. However, due to the unclear fault characteristics, the final comparison The result of the judgment is also inaccurate

[0004] It can be seen that there is a lack of a method for timely and accurately judging single-phase ground faults in the prior art.

Images