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.