Analisis Pengukuran Pentanahan Menggunakan Metoda 3 Titik Fuzzy Logic Mamdani pada Saluran Tegangan Ekstra Tinggi (SUTET) 500KV Gardu Induk Ngimbang
DOI:
https://doi.org/10.58192/populer.v5i3.5531Keywords:
500 KV SUTET, Centroid, Grounding Resistance, Mamdani Fuzzy Logic, Three-Point MethodAbstract
The grounding system is an important part of an electrical power system, particularly in the 500 kV Extra High Voltage Overhead Transmission Line (SUTET), which functions to conduct fault currents into the ground and protect equipment and personnel. Grounding resistance values can be influenced by measurement and environmental conditions, requiring a method capable of considering such uncertainties. Therefore, this study applies the Mamdani Fuzzy Logic method to correct and evaluate grounding resistance measurements on the 500 kV SUTET at Ngimbang Substation. Measurements were conducted using the three-point method (Fall of Potential) with a Kyoritsu 4105A instrument. The Mamdani Fuzzy model uses two input variables, namely the potential electrode distance ratio P and the measured resistance value, with the output being the grounding resistance correction value. The processing stages include fuzzification, inference, aggregation, and defuzzification using the Centroid method implemented in MATLAB.The results showed an MAE value of 0.638 Ω and an RMSE value of 0.834 Ω. In the low-resistance case study, the evalfis result was 3.586 Ω, with a difference of 0.3036 Ω compared to the manual Centroid calculation of 3.283 Ω. In the high-resistance case study, the evalfis result was 14.984 Ω, with a difference of 0.0508 Ω compared to the manual calculation of 14.933 Ω. These results indicate that the Mamdani Fuzzy system can provide consistent correction results in evaluating grounding resistance conditions.
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