Sectional line grounding fault detection and isolation system and detection and isolation method thereof

Abstract

The invention relates to a sectional line grounding fault detection and isolation system and a detection and isolation method thereof. The sectional line grounding fault detection and isolation system comprises a plurality of sets of wide-area synchronous circuit breaker controllers with wide-area synchronous characteristics and wide-area synchronous phase current sensors. After the wide-area synchronous circuit breaker controllers detect a grounding fault of the system, a triggering moment is recorded. In a fault positioning detection module, whether a final output fault is located in a section between the current wide-area synchronous circuit breaker controller and the adjacent downstream wide-area synchronous circuit breaker controller is judged. Therefore, when a single-phase earth fault occurs, whether the fault occurs in the area or not can be quickly and accurately positioned according to the area information, the fault interval can be quickly switched for the fault in the area, and a more accurate fault interval can be reported to a superior platform or a final user.

Description

technical field [0001] The invention relates to a fault isolation system in a power system and a detection and isolation method thereof, in particular to a segmented line grounding fault detection and isolation system and a detection and isolation method thereof. Background technique [0002] As far as the existing power lines are concerned, the distribution lines have many branches, the lines are long, and the topology is relatively complicated. When a short circuit or ground fault occurs, the fault must be isolated and eliminated as soon as possible, otherwise it will seriously affect the quality and efficiency of power supply, and even bring about power supply safety problems. [0003] In order to isolate and eliminate faults as soon as possible without causing large-scale power outages, it is necessary to accurately locate faults. At present, the distribution automation terminal FTU commonly used in the line basically adopts local isolation protection. During the imple...

AI Technical Summary

Problems solved by technology

[0004] However, in practical applications, there is a problem that the accuracy of fault detection is not high based on the data characteristics of a single point.

Additionally, an FTU at a location has no way of knowing if it is upstream from the nearest neighbor of the fault

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