Marandewa, Fadhil (2024) Evaluasi Koordinasi Sistem Proteksi Beban Smelter Pada Plan Smelter Nikel Di Sulawesi Selatan. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Plan Smelter Nikel di Sulawesi Selatan merupakan perusahaan pertambangan nikel yang dimana membutuhkan keandalan sistem kelistrikan yang tinggi dalam meningkatkan operasi pertambangannya. Dalam sistem kelistrikan pada sistem ini tidak jarang gangguan terjadi terutama pada beban smelter hingga dapat menyebabkan blackout di sistem 33 KV. Dengan terjadi gangguan tersebut kontinuitas suplai daya terganggu sehingga dibutuhkannya evaluasi koordinasi proteksi untuk menjaga keandalan dan selektivitas sistem kelistrikan. Berdasarkan kasus di lapangan kinerja sistem proteksi perusahaan masih belum bisa dikatakan sebagai sistem proteksi yang handal. Hal ini disebabkan karena ketika terjadi gangguan pada sistem kelistrikan di sisi beban maka sistem akan mengalami blackout. Kasus ini disebabkan urutan
pembukaan dari circuit breaker pada sistem belum sesuai dengan rele menyebabkan CB pada sisi beban tidak trip sehingga CB bagian atas membuka terlebih dahulu yang memungkinkan terjadinya blackout. Pada tugas akhir ini dilakukan analisis kinerja sistem proteksi koordinasi eksisting rele arus lebih gangguan fasa dan rele arus lebih gangguan ke tanah. Analisis ini dilakukan untuk mengetahui efektivitas dan efisiensi koordinasi sistem proteksi terseebut.
Selanjutnya evaluasi dilakukan untuk menentukan urutan tripping rele proteksi yang tepat agar tidak terjadi blackout. Setelah evaluasi didapatkan hasil simulasi dari penilitian ini. Hasil dari simulasi ini adalah didapatkan resetting dari setiap rele arus ganggguan fasa dan rele arus
gangguan ke tanah dari evaluasi terhadap eksisting sistem tersebut. Hasil evaluasi ini diharapkan dapat menjadi pertimbangan bagi Plan Smelter Nikel di Sulawesi Selatan dalam mengatasi permasalahan proteksi sistem kelistikan pada beban smelter.
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The Nickel Smelter Plan in South Sulawesi is a nickel mining company that requires high reliability of the electrical system in improving its mining operations. In the electrical system, this system often experiences disturbances, especially in the smelter load, which can cause blackouts in the 33 KV system. With this disturbance, the continuity of the power supply is disrupted, so that an evaluation of the protection coordination is needed to maintain the reliability and selectivity of the electrical system. Based on cases in the field, the performance of the company's protection system still cannot be said to be a reliable protection system. This is because when there is a disturbance in the electrical system on the load side, the system will experience a blackout. This case is caused by the opening sequence of the circuit breaker in the system not being in accordance with the relay causing the CB on the load side not to trip so that the upper CB opens first, allowing a blackout to occur. In this final assignment, an analysis of the performance of the existing coordination protection system of phase fault overcurrent relays and ground fault overcurrent relays was carried out. This analysis was carried out to determine the effectiveness and efficiency of the coordination of the protection system. Furthermore, an evaluation was carried out to determine the correct tripping sequence of the protection relay so that a blackout would not occur. After the evaluation, the simulation results were obtained from this study. The result of this simulation is the resetting of each phase fault current relay and ground fault current relay from the evaluation of the existing system. The results of this
evaluation are expected to be a consideration for the Nickel Smelter Plan in South Sulawesi in overcoming the problem of electrical system protection on the smelter load.
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