A high-voltage cable terminal fault early warning method and device based on equivalent thermal circuit method

By dynamically calculating the alarm temperature threshold on the cable surface using the equivalent thermal circuit method, the problem of inaccurate fixed thresholds in high-voltage cable terminal fault early warning is solved, and accurate fault early warning for high-voltage cable terminals is achieved.

CN122171927APending Publication Date: 2026-06-09HUANENG LANCANG RIVER HYDROPOWER CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUANENG LANCANG RIVER HYDROPOWER CO LTD
Filing Date
2026-02-14
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In existing high-voltage cable terminal fault early warning methods, the fixed temperature threshold cannot be dynamically adjusted according to the actual load current of the cable and changes in ambient temperature, resulting in insufficient accuracy and reliability of the early warning.

Method used

The equivalent thermal circuit method is adopted. By monitoring the operating current and ambient temperature of the high-voltage cable in real time, the alarm temperature threshold of the cable surface is dynamically calculated, and the real-time monitored temperature is compared with the dynamic threshold to issue a fault warning signal.

Benefits of technology

It improves the accuracy and reliability of fault early warning, avoids false alarms or missed alarms caused by fixed thresholds, and realizes accurate assessment and timely early warning of cable thermal condition.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

The application provides a high-voltage cable terminal fault early warning method and device based on an equivalent thermal circuit method, and the application comprises the following steps: obtaining real-time working current and real-time environmental temperature of a high-voltage cable; based on the real-time working current, the real-time environmental temperature and a preset cable equivalent thermal circuit model, a dynamic cable surface alarm temperature threshold is calculated; the real-time monitored cable surface temperature is compared with the dynamic cable surface alarm temperature threshold; when the real-time monitored cable surface temperature exceeds the dynamic cable surface alarm temperature threshold, a fault early warning signal is sent. The application realizes dynamic adjustment of the alarm temperature threshold, makes the fault criterion fit the actual operation state of the cable, improves the accuracy and reliability of the fault early warning, can also identify the performance degradation trend of the cable in advance, realizes predictive maintenance and effectively guarantees the safe and stable operation of the high-voltage cable line.
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