A power transformer is an electrical machine that converts electrical power at different voltage levels. Faults, occur in power transformers, inhibit electrical power distribution to the consumer. Protection, therefore, of the power transformers is essential in power systems reliability. The power system can be reliable if the protection devices work well when there is a fault. A hybrid intelligent technique, which is a combination of Artificial Neural Network (ANN) and Fuzzy known as Adaptive Neuro-Fuzzy Inference Systems (ANFIS), was used in this research. The objective of this paper is the simulation of differential relays as a protection device on power transformers using Matlab/Simulink. Performance of differential relays for power transformers protection is carried out with internal and external fault scenarios. The input data were classified into three different input for ANFIS such as internal and external 1, internal and external 2, internal, external 1, and external 2, respectively. The error results of ANFIS training for the type of fault internal and external 1 is 9.46*10-7, and types of fault internal and external 2 is 1.09*10-6 internal, external 1 and external 2 are 8.59*10-7. The results obtained from the simulation were accurate and shows that the ANFIS technique is an efficient method that gives less error and a great value. Finally, the technique can minimize faults with power transformers. Finally, to prove this method can reduce faults in the power transformer, the assess of this model has been carried out through the RMSE that has been generated which is zero.
Sistem daya listrik memiliki pembangkitan, sistem transmisi, sistem distribusi, sistem proteksi, dan beban. Sistem pembangkitan tenaga listrik merupakan elemen yang digunakan sebagai objek simulasi ketika terjadi gangguan pada transformator daya. Teknik cerdas yang akan digunakan adalah teknik hibrid yaitu gabungan Jaringan Syaraf Tiruan (JST) dan logika Fuzzy yang dikenal dengan ANFIS. Tujuan tulisan ini adalah mengusulkan suatu model gangguan menggunakan relai diferensial pada transformator daya untuk sistem perlindungan via Matlab/Simulink. Simulasi ini akan dianalisis performa relai diferensial untuk transformator daya yang dijalankan terhadap gangguan internal dan eksternal. Teknik ANFIS ini dapat berkontribusi dalam proses deteksi gangguan dengan cara aman dan andal. Pelatihan ANFIS diharapkan akan dapat memecahkan permasalahan identifikasi gangguan pada transformator daya berkapasitas 25 MVA. Hasil yang diperoleh dari simulasi ini adalah dapat memberi rekomendasi yang akurat dan efisien dari teknik yang telah dikembangkan menggunakan teknik ANFIS. Hasil keluaran yang diharapkan memberikan koreksi galat yang kecil dan mendekati nilai yang baik. Dan akhirnya, dengan penerapan teknik ANFIS ini dapat memberikan peramalan pada sistem transformator daya untuk meminimalisir gangguan pada transformator daya.
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