TYPICAL VALUES OF GAS CONCENTRATION AND GAS RATES INCREASE IN POWER TRANSFORMER IN INDONESIA WITH DIFFERENT OPERATING VOLTAGE

• Main Author: Rahmanda, Dhiastara
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/76187
• Institution: Institut Teknologi Bandung

The Dissolved Gas Analysis (DGA) is a method that is often used in transformator maintenance. Therefore, the interpretation of the results of the gas content in transformator oil must be carried out properly to get the right information regarding the condition of the transformator. The internasional standards for the interpretation of DGA in transformators with mineral oil are IEEE C57.104 and IEC 60599. In this research, a comparison of these standards was carried out to find out which tipikal values from those standards, some tipical value from other researches, and typical value from this study to know which more in line with the actual conditions of the power transformator. In this research, a tipikal value of the concentration of gas content in transformator oil was searched to get better accuracy than tipikal values at internasional standards and other study. A total of 6092 samples of transformator mineral oil from 2473 transformator units were used to find tipikal values of gas concentrations with operating voltage which were divided into several categories, namely category O with > 500 kV with subcategories 500 and 525 kV, category A with a voltage rating between 170 kV and 400 kV with subcategory 275 kV, category B with a rated voltage between 72.5 kV and 170 kV with subcategories of 150 kV and others, and kategori C with rated voltages between below 72.5 kV with subcategories of 70 kV, 20 kV, and others. In this study, the typical value for individual Gas rates was also searched with 765 samples from 500 transformator units. Typical values in this study uses the 90 and 95 percentile methods. Typical value from this study will be compared with actual data from 62 transformer units. The results are typical values in this study have better accuracy than tipikal values in IEC 60599 and IEEE C57.104 and other typical values from some research..