A non-contact monitoring device and method for transformer oil level

By collecting ultrasonic signals from the sidewall of the transformer oil conservator and constructing a judgment threshold within the oil level range, dynamic monitoring and early warning of the transformer oil level are realized. This solves the problems of inaccurate oil level monitoring and delayed early warning in the existing technology, and realizes real-time and accurate early warning of the oil level.

CN122149596APending Publication Date: 2026-06-05STATE GRID HENAN ELECTRIC POWER CO TANGHE COUNTY POWER SUPPLY CO
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
STATE GRID HENAN ELECTRIC POWER CO TANGHE COUNTY POWER SUPPLY CO
Filing Date
2026-04-07
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing non-contact monitoring methods for transformer oil levels are susceptible to interference from ambient temperature, resulting in inaccurate oil level estimation. Furthermore, fixed threshold monitoring methods lead to delayed early warnings and poor adaptability.

Method used

By collecting ultrasonic signals at different heights on the sidewall of the transformer oil conservator, a judgment threshold within the oil level range is constructed. Combined with the characteristic values ​​of the ultrasonic signals, dynamic judgment is made to achieve real-time monitoring and early warning of the oil level.

Benefits of technology

It effectively solves the problem of accuracy in oil level monitoring, enabling early warning before the oil level drops to the lower limit, avoiding the problems of delayed warning and poor adaptability, and combining threshold-triggered and trend-predictive warning methods.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application relates to the technical field of intelligent sensors, in particular to a transformer oil level non-contact monitoring device and method, which specifically comprises the following steps: collecting ultrasonic signals at different positions of the side wall of an oil pillow, constructing a judgment threshold of each position through the similar conditions of the ultrasonic signals at different positions under the actual oil level condition after oiling in history; constructing corresponding signal characteristic values through the ultrasonic signals at each position in a current time interval, comparing the signal characteristic values with the corresponding judgment threshold, analyzing the current oil level position, and determining a warning time through real-time changing ultrasonic signals, so that the oil level can be warned in advance before falling to a lower limit position; the problem that passivity is relatively large in oil level monitoring through a fixed threshold in the existing transformer oil level monitoring mode is avoided, and the problems of lagging warning and poor adaptability in the existing mode are solved.
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