A method and system for monitoring leakage current in multiple loops with common zero.
By performing Fourier transform and vector superposition on the current signal of a multi-loop common-zero system, the problem of false leakage current alarms in traditional methods is solved, and more accurate leakage current monitoring is achieved.
CN122307422APending Publication Date: 2026-06-30CHENGDU ZHIDA POWER AUTOMATIC CONTROL CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHENGDU ZHIDA POWER AUTOMATIC CONTROL CO LTD
- Filing Date
- 2026-05-29
- Publication Date
- 2026-06-30
AI Technical Summary
Technical Problem
Traditional multi-circuit zero-escape current monitoring methods cannot effectively distinguish between normal unbalanced current and actual leakage current, resulting in frequent false leakage current alarms, which affect system reliability and operation and maintenance efficiency.
Method used
By acquiring the current signal of the feeder circuit set, performing Fourier transform processing to obtain the current vector, performing vector superposition to calculate the total current vector, and comparing it with the preset leakage threshold, it is determined whether there is a leakage fault.
Benefits of technology
Significantly reduces false alarm rate, improves accuracy and reliability of leakage current monitoring, and ensures accurate leakage current judgment.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN122307422A_ABST
Abstract
This application discloses a multi-circuit common-zero leakage current monitoring method and system. This application can acquire the current signal of each feeder circuit in a feeder circuit set; perform Fourier transform processing on the current signal of each feeder circuit in the feeder circuit set to obtain the current vector corresponding to the current signal of each feeder circuit, the current vector including a real part and an imaginary part; perform vector superposition on the current vectors corresponding to all feeder circuits in the feeder circuit set to obtain a total current vector; calculate the amplitude corresponding to the total current vector; when the amplitude is greater than a preset leakage current threshold, it is determined that there is a leakage current fault in the feeder circuit set corresponding to the electrical equipment, and a leakage current alarm is triggered. Therefore, this application can effectively distinguish between normal unbalanced current and actual leakage current, significantly reduce the false alarm rate, and improve the accuracy and reliability of leakage current monitoring.
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