Method and system for quantitative analysis of overheat failure gas of on-load tap changer contact

By constructing a multi-physics coupled mathematical model, the problem of diagnostic lag in on-load tap changer contact overheating faults was solved, realizing a leap from qualitative diagnosis to quantitative prediction, and providing early warning and accurate analysis capabilities.

CN121768509BActive Publication Date: 2026-05-01STATE GRID HUNAN ELECTRIC POWER CO LTD MAINTENANCE CO +2
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Patent Information

Application Number
CN202610237235.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-02-28
Publication Date
2026-05-01
Estimated Expiration
2046-02-28

AI Technical Summary

Technical Problem

Existing technologies cannot accurately reflect the physicochemical processes of overheating faults in on-load tap changer contacts, resulting in high diagnostic lag, inability to achieve early warning, and a lack of detailed models of multi-physics coupling processes.

Method used

A multi-physics coupled mathematical model of an on-load tap changer is constructed, including electromagnetic field, temperature field and fluid field. The temperature distribution and gas generation rate on the contact surface are calculated by solving the model, and the mapping relationship between contact overheating parameters and gas concentration is established.

Benefits of technology

It enables precise quantitative analysis of contact overheating faults, provides accurate early warnings in the early stages of faults, improves the sensitivity and reliability of condition monitoring, and is applicable to on-load tap changers of different types and operating conditions.

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Abstract

The application discloses a kind of overheat fault gas quantitative analysis method and system of on-load tap-changer contact, the method of the present application includes constructing the multi-physics field coupling mathematical model of on-load tap-changer, define contact surface contact resistance;Solving multi-physics field coupling model obtains the time domain and spatial temperature distribution of on-load tap-changer contact surface, determine the highest temperature and the volume of overheated area;Calculate the local gas production rate of each fault characteristic gas;The local gas production rate of all fault characteristic gases in the volume of hot area is integrated to obtain the theoretical equilibrium concentration of each fault characteristic gas in oil, construct the mapping relationship between the overheating parameters of contact surface contact resistance and highest temperature and theoretical equilibrium concentration.The present application aims to solve the problem that the traditional oil dissolved gas analysis method relies on empirical criterion and has high hysteresis, break through the bottleneck that cannot simulate the whole process of "electric-thermal-flow-chemical" from mechanism level, realize the leap from qualitative diagnosis to quantitative prediction.
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