HIGH VOLTAGE POWER TRANSFORMER CONDITION ASSESSMENT CONSIDERING ITS HEALTH INDEX VALUE AND DECREASING RATE

• Main Author: Riga Tamma, Winanda
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/50499
• Institution: Institut Teknologi Bandung

Power transformer is one of the most important utilities that has a critical role in good electrical power delivery. Thus, its performance has to be assessed periodically to prevent failure. Then, the transformers will not suddenly fail. A health index method is a useful tool for the transformer assessment condition. This method has been carried out in several previous studies. However, most of them have not observed the health index decreasing rate as an aspect to improve the transformer condition assessment. This study proposed a health index method with different approaches, then consider the values and its decreasing rate to assess the transformer condition. This study involved inspection data from in-service and out-of-service 150 kV power transformers provided by the Indonesian electric company. The correlation between operating age to Health Index value and Health Index decreasing rate were also observed. With increasing operation age, the Health Index value tends to be decreasing with a correlation coefficient R2 0.631. Further analysis was done to power transformers with historical data of 3 years or more, showing the tendency of Health Index value decreasing rate is higher with older transformers. This paper also illustrates the Health Index analysis of 35 out-of-service transformers, resulting in more suitable HI value compared to the previous approach. After that, this study proposed the transformer risk assessment based on its health index value and the decreasing rate.