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May 6, 2026AIP Advances0 citationsOpen Access

Estimating Dielectric Loss, Degree of Polymerization, and Breakdown Voltage in Transformer Oils

Ultrasonic feature-based regression of DP, breakdown voltage, and dielectric loss in transformer oil–paper insulation

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Authors

WGWeizhe GuoZFZhou FanSXShiyezi Xiang

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Overview

This work demonstrates that ultrasonic measurements estimate dielectric loss and degree of polymerization in insulation, suggesting efficient testing methods.

Key Points

  • This work investigates the use of ultrasonic measurements for estimating key indices of transformer oil–paper insulation.
  • Conducted a controlled thermal-aging experiment on an oil–paper insulation system at seven aging stages.
  • Tested 20 samples at each stage, measuring degree of polymerization, breakdown voltage, and dielectric loss.
  • Developed a regularized feature-based regression model and evaluated using sample-wise stratified fivefold cross-validation and LOSO validation.
  • Achieved R2 values of 0.988 for degree of polymerization, 0.827 for breakdown voltage, and 0.991 for dielectric loss.
  • Pooled predictions showed NRMSE values of 3.5% for degree of polymerization, 10.5% for breakdown voltage, and 3.1% for dielectric loss.
  • Performance decreased during the supplementary LOSO validation, indicating the need for further refinement.

Cite This Study

Guo et al. (2026) studied this question.

synapsesocial.com/papers/69fa8eac04f884e66b530fa1https://doi.org/10.1063/5.0321700
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