Abstract
Harmonics is a periodic sine wave distortion, due to the operation of nonlinear loads. Har-monics causes current to flow in the neutral wire even though in a balanced load condition, in addition to harmonic load imbalance problems will increase the current flowing in the neutral wire, making it dangerous for the electrical system. This research was using electrical system modeling simulation in MATLAB application by changing the earth resistance value to see the effect of earth resistance value to Total Harmonic Current Distortion (THDi), it is necessary to analyze the effect of resistance value for THDi neutral wire grounding. This study uses the Fast Fourier Transform (FFT) method. THDi simulation results when the conditions of the resistance value is 9 ?, THDi percentage in phase R is 6.30%, Phase S is 2.86%, Phase T is 2.50%. When the earth resistance value is 5 ?, the percentage of THDi decreases with the value in phase R is 6.09%, Fasa S is 2.61%, Fasa T is 2.48%. When the earth resistance value is 2 ?, the THDi percentage in the R phase is 5.85%, Fasa S is 2.09%, Fasa T is 2.22%. Based on the simulation results it is known that the smaller the earth resistance value, the smaller the harmonic distortion in the electrical system.
Highlights
Harmonics is a periodic sine wave distortion, due to the operation of nonlinear loads
SCRatio dilakukan per fasa dihitung dengan menggunakan Persamaan 1
[10] Janardana, IGN, Pengaruh Umur pada Beberapa Volume Zat Aditif Bentonit Terhadap Nilai Tahanan Pentanahan
Summary
Sistem kelistrikan di Fakultas Teknik Universitas Udayana – Sudirman disuplai dari dua buah transformator distribusi 20 kV /380 V salah satunya berkapasitas daya sebesar 100 kVA dan mensuplai kebutuhan beban gedung B, C, D, dan E. Penggunaan beban nonlinier mengakibatkan munculnya permasalahan harmonisa pada sistem kelistrikan di Fakultas Teknik Universitas Udayana – Sudirman. Berdasarkan data hasil pengukuran Total Harmonic Distorstion (THD) arus dan dibandingkan dengan standar IEEE 5192014 maka Nilai THD arus pada transformator yang menyuplai beban gedung B, C, D, dan E yaitu pada fasa R = 9,8 % fasa S = 11,0 % fasa T = 7,5 % [2]. Selain permasalahan harmonisa terdapat permasalahan ketidakseimbangan beban dapat diketahui dari hasil pengukuran yang dilakukan pada kawat netral, mengalir arus sebesar 41,6 A [2].
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