ANALISA KEANDALAN TRANSFORMATOR DAYA MENGUNAKAN METODE POLA DISTRIBUSI WEIBULL

PADA GARDU INDUK SKYLINE PT.PLN (PERSERO) JAYAPURA

Abstract

Reliability is the ability of a system or component to fulfill the required function under certain conditions over a specific timeframe. The reliability of the transformer is affected by the failure rate. The more often it fails or does not operate, the less reliable the performance of the transformer is to do its work. Failure of transformers in the transmission sub-system not only reduces power system reliability but also has a significant effect on power quality. In order to increase the reliability of the utility, to carry out an analysis of the origin and failure rate, the causes of physical damage must be studied. The purpose of this study was to determine the cause of the 60 MVA, 150/20 kV power transformer circuit breaker (PMT) at the Skyline trip/detach substation, and calculate the value of the reliability index of the power transformer. To find out the causes of PMT power transformers working, literature studies/operation reports and interviews were used. Meanwhile, to calculate the power transformer reliability index value, the Weibull distribution method is used. Causes of PMT 150/20 kV power transformer 60 MVA trips caused by external faults: occurred 37 trips/disconnects for 27,079 minutes, internal faults: occurred 7 times trips/disconnects for 4,633 minutes and unknown faults: the cause occurred 10 trips / off for 6,772 minutes, the total disturbance that occurred was 54 trips / off for 38,484 minutes. Based on the results of data processing, the value of MTTF (Mean Time To Failure) is 0.4373 years and the value of the failure rate function or % Hazardous function obtains an average failure rate value of 2.2870% years.