Development of Transformer Monitoring System for Condition-Based Maintenance in PT. PLN Java-Bali Transmission and Load Dispatch Center

Power transformer is one of the most important and expensive equipments in Electrical Utility Company. PT PLN Java-Bali Transmission and Load Dispatch Center (PT PLN P3B Jawa-Bali) started to renew the maintenance program for its equipments including power transformers since 2006 in order to reduce transformer failure. The maintenance program which is based on Condition-Based Maintenance (CBM) has several activities. This paper will report one of these activities which is Transformer Monitoring System (TMS) in Java-Bali. Based on their individual function, the architecture of the monitoring system is divided into two parts, which are the Field sub-system and the Data Collecting Center sub-system. The purpose of the monitoring system is to collect transformer parameters based on an on-line measurement and to indicate tranformer´s premature loss. The statistical model and physical model have been used to indicate transformer condition index and transformer´s component condition respectively. Clustering strategy consideration was made to accommodate the various transformer manufacturers and the various types of transformers owned by PT PLN.