A method, a monitoring system and a transformer arrangement

The method involves exciting a transformer tank with an actuator and measuring vibrational responses to detect structural degradation, addressing the limitations of existing monitoring systems by providing robust and reliable online diagnostics.

WO2025067844A1 Publication Date: 2025-04-03HITACHI ENERGY LTD
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Patent Information

Application Number
PCT/EP2024/074815
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-09-29
Filing Date
2024-09-05
Publication Date
2025-04-03

AI Technical Summary

Technical Problem

Existing methods for monitoring transformer degradation are not robust or reliable enough for online monitoring and diagnostics, particularly in detecting incipient mechanical faults related to winding clamping pressure relaxation and other structural changes in transformer tanks.

Method used

A computer-implemented method and monitoring system that mechanically excites a transformer tank at various frequencies using an actuator and simultaneously measures the resulting vibrational response using sensors, allowing for the detection of structural degradation by comparing the vibrational response to a reference response.

Benefits of technology

The method effectively identifies incipient structural changes and degradation in transformer tanks by analyzing vibrational responses, providing early warning of potential faults and enabling timely maintenance or shutdown to prevent accidents.

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Abstract

A method (2) for monitoring of structural degradation in a transformer arrangement (3) The transformer arrangement (3) comprises a transformer tank (10) and a transformer (12) enclosed by the transformer tank (10) and immersed in an insulating fluid inside the transformer tank (10). The method (2) is performed by a monitoring system (400) comprising a control unit (1), an actuator assembly (14) controllable to dynamically excite the transformer arrangement (3), and a sensor assembly (16) configured to detect a vibrational response V in the transformer tank (10) of the transformer arrangement (3). The method (2) comprises, by the control unit (1) : controlling S1 the actuator assembly (14) to dynamically excite the transformer arrangement (3); detecting S2, via the sensor assembly (16), a vibrational response V of the transformer arrangement (3); comparing S3 the vibrational response V to a reference response R; and determining S4 a structural degradation of the transformer arrangement (3) in response to the comparison between the vibrational response V and the reference response R exceeding a threshold value. A monitoring system (400) and a transformer arrangement are also disclosed.
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