Porcelain Insulator Maintenance Management for Smart Power Transformer

Abstract

Power transformer is one of expensive equipment in electrical power system. Porcelain insulators that are bushing and arrester are one of significant components of the transformer. Failures of the insulators are unacceptable due to catastrophic consequences to the transformer. Hence, this paper aims to present maintenance management of the transformer porcelain insulators by using electrical test results and visual inspection records with scoring and weighting techniques to evaluate their condition. Besides, statistical failures of main components are utilized for weighting number of bushing and arrester in order to calculate the percentage of entire porcelain insulators of power transformers. Loading transformers and tietransformers are selected for the insulator condition assessment. Finally, condition based maintenance strategies of the porcelain insulators for smart power transformers are managed properly by following their obtained condition.  Index Terms-smart power transformer, porcelain insulators, condition based maintenance, diagnostic techniques