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Practical Maintenance Model of Power Transformer in Thai Transmission System by Using FMECA


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DOI: https://doi.org/10.15866/iree.v17i6.23027

Abstract


Failure Modes Effects and Criticality Analysis of the maintenance model of risk management for power transformers in Thai transmission system is proposed and measured by severity, occurrence, and detection in order to establish a risk priority number or criticality. The severity involves two criteria: susceptibility and efficiency. The susceptibility-severity concerns four sub-criteria: service life of transformer components, system stability, social aspect, and public image, while the efficiency-severity focuses on the percentage of component condition index determined by the electrical and insulating oil tests, and visual inspection. The weight and score technique is also applied. The occurrence specifies the frequency of component failure, while the detection refers to the capability to detect failures. Furthermore, the scores of severity, occurrence, and detection are compared to their limitation with five levels: one for low and five for high risks. Subsequently, the criticality to plan and prioritize the maintenance model is established into two approaches: susceptibility-criticality and efficiency-criticality. The maintenance action is categorized into four models: low for acceptable, medium for tolerable, high and very high degrees for unacceptable risks. In the analysis, 78 transformers rating 115 kV and 33 transformers rating 230 kV in Thailand are studied. Available major failures on winding, on load tap changer and bushing are investigated. The results show that all the windings are first prioritized with refurbishment or replacement action due to unacceptable risk with frequent failure and very low detectability. Consequently, the effective maintenance model can be achieved with higher system reliability and reduced failure risk.
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Keywords


FMECA; Power Transformer; Criticality Analysis; Maintenance Model

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References


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