Transformer reliability survey

Introduction

Reliable service experience data for high-voltage transformers is essential for both utilities and manufacturers. It supports product improvement, asset management strategies, procurement decisions, maintenance planning, benchmarking, and overall power system reliability assessment. Statistical analysis of transformer failure data provides valuable insights into future failure behavior and contributes to improving international standards.

CIGRE Working Group A2.37 (Transformer Reliability), established in 2008, launched a comprehensive international survey to harmonize transformer failure data collection and deliver updated reliability statistics. This Technical Brochure presents the methodology, results, statistical analysis, and recommendations derived from the survey

The…