Method for detecting a fault, fault passage indicating device and feeder

By calculating the incremental values ​​of phase current and power in the AC power distribution network, and utilizing integration and dynamic thresholds within a time window, a fast and economical fault identification is achieved. This solves the problems of high voltage measurement cost and long identification time in existing technologies, and simplifies fault segment location.

CN122162059APending Publication Date: 2026-06-05HITACHI ENERGY LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HITACHI ENERGY LTD
Filing Date
2024-11-27
Publication Date
2026-06-05

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Abstract

Disclosed herein is a method (100) for fault passage indication in a substation (20) of an alternating current (AC) electrical distribution network (2) having a plurality of phases (2a-c). The method comprises determining (110) a phase current delta value for each phase, and calculating (120) a power delta value for each phase based on the determined phase current delta value. The method further comprises integrating (130) each power delta value over a time window, and determining (140) whether one of the integrated power delta values exceeds a predetermined threshold while the remaining integrated power delta values are all below the predetermined threshold, and if so, indicating a fault passage. Also disclosed herein is a fault passage indicator device (10) and a feeder (30).
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