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This study aims to estimate the age-dependent reliability of power transformer components using large-scale data.

July 8, 2026EnergiesOpen Access

Power Transformer Component Reliability Using CIGRE Large-Scale Data Surveys

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Randomized trial estimates age-dependent component reliability in transformers, suggesting improved risk management strategies.

This study aims to estimate the age-dependent reliability of power transformer components using large-scale data.
Analyzed data from 50 utilities covering 26,533 transformers and 331,379 operating years.
Calculated hazard rates for various transformer components using Weibull distribution models.
Assessed retirements with the Kaplan-Meier estimator while addressing data truncation and censoring issues.
Overall major failure rate identified at 0.41% per year across the surveyed transformers.
100-199 kV transformers showed constant hazard rates with age, influenced by increasing retirements.
For the 200-700 kV transformers, bushing hazard rates exceeded active-part hazard at approximately 50 years.

Martin et al. (2026) studied this question.

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