Failure Diagnosis and Root-Cause Analysis of In-Service and Defective Distribution Transformers

Diagnostic data of transformers are essential in determining their integrity and to estimate reliability. Such diagnostic is not available for distribution as only meagre attempts made accumulate this information. The reason lack such attention attributed the compromise meet financial constraints cost-cutting measures. It needless emphasize significance these evading premature failures enhancing accuracy maintenance program. Overall, concepts methods well defined regarding power transformers, but cannot be extended transformers. This paper fill gap by measuring from in-service defective For purpose, eight (six in-service, two defective) showing deviations status were selected a group. As per kVA rating operating status, chosen categorized into three sets insulation winding-core arrangement analyzed. Later, root-cause analysis was performed on understand failure reasons possibilities evade them. pertinent obtained quite valuable making decisions reliability-oriented extending its potential distributed generation.