Mumpuni, Melati Listiya (2026) Analisis Setting Waktu Proteksi Arus Lebih Dengan Mempertimbangkan Critical Clearing Time Di Pertamina Refinery Unit (Ru) Iv Cilacap Akibat Perubahan Pola Operasi Pasca Pengalihan Beberapa Beban Ke Pln. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Kilang RU IV memiliki peran strategis dalam memenuhi kebutuhan bahan bakar nasional, dengan memasok sekitar 34% dari total kebutuhan bahan bakar Indonesia dan sekitar 60% dari kebutuhan di Pulau Jawa. Pada tahun 2018, PT Pertamina (Persero) dan PT PLN (Persero) menandatangani Nota Kesepahaman (Memorandum of Understanding/MoU) untuk bekerja sama dalam penyediaan pasokan listrik dari pembangkit milik PLN ke lima kilang utama, termasuk RU IV Cilacap. Sebagai konsekuensinya, sebagian beban listrik yang sebelumnya sepenuhnya disuplai oleh sistem internal Pertamina kini sebagian dialihkan ke jaringan PLN. Perubahan ini mengubah pola operasi sistem kelistrikan kilang, yang berdampak pada perubahan nilai arus nominal maupun arus hubung singkat. Untuk menjamin keberlanjutan produksi, keandalan sistem, dan keselamatan operasi, diperlukan koordinasi sistem proteksi yang sensitif, selektif, dan terkoordinasi dengan baik, khususnya dengan mempertimbangkan Critical Clearing Time (CCT) sesuai dengan kondisi operasi sistem yang baru. Apabila gangguan tidak dibersihkan (misalnya pemutus tenaga tidak membuka) sebelum CCT tercapai, sudut rotor akan terus meningkat sehingga berpotensi menyebabkan generator kehilangan sinkronisasi. Metode yang digunakan untuk menentukan CCT adalah analisis stabilitas transien, yang mengevaluasi respons sudut rotor setelah terjadinya gangguan. Tujuan dari penelitian ini adalah untuk memberikan rekomendasi pengaturan waktu proteksi arus lebih (overcurrent protection) yang memastikan pemutusan gangguan oleh pemutus tenaga terjadi sebelum CCT terlampaui. Dengan demikian, sistem dapat tetap berada dalam kondisi sinkron, mencegah ketidakstabilan sudut rotor, serta menjaga keberlanjutan produksi di kilang Pertamina RU IV Cilacap. Data yang diperlukan dalam penelitian ini meliputi data pembangkitan dan beban, konfigurasi sistem distribusi, spesifikasi transformator, data kabel, spesifikasi pemutus tenaga, serta karakteristik rele arus lebih. ======================================================================================================================================
The RU IV Refinery holds a strategic role in meeting the national fuel demand, supplying approximately 34% of Indonesia's total fuel needs and 60% of the demand in Java. In 2018, PT Pertamina Persero and PT PLN Persero signed a Memorandum of Understanding (MoU) to collaborate in providing electricity supply from PLN’s power plants to five major refineries, including RU IV Cilacap. As a result, a portion of the electrical load that was previously supplied entirely by Pertamina’s internal system has now been partially transferred to the PLN grid. This shift has altered the operational pattern of the refinery's power system, leading to changes in both nominal current and short-circuit current values. To ensure production continuity, system reliability, and operational safety, a protection system coordination that is sensitive, selective, and well-coordinated is required particularly with consideration of the Critical Clearing Time (CCT), in accordance with the system's new operating conditions. CCT is defined as the maximum allowable time for a protection system to isolate a fault before the system becomes unstable. If the fault is not cleared (i.e., the circuit breaker does not open) before the critical clearing time, the rotor angle will continue to increase, potentially causing the generator to lose synchronism. The method used to determine the CCT is transient stability analysis, which evaluates the rotor angle response following a disturbance. The objective of this study is to provide recommended overcurrent protection time settings that ensure fault isolation by the circuit breaker occurs before the CCT elapses. This allows the system to remain in synchronism, prevents rotor angle instability, and maintains production continuity at the Pertamina RU IV Cilacap refinery. The data required for this research includes generation and load data, distribution system configuration, transformer specifications, cable data, circuit breaker specifications, and overcurrent relay characteristics.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Critical Clearing Time, Transient Stability Assessment, Proteksi Koordinasi, Proteksi Arus Lebih, Pertamina RU IV Cilacap, Critical Clearing Time, Transient Stability Assesment, Protection Coordination, Overcurrent Relay, Pertamina RU IV Cilacap |
| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK1010 Electric power system stability. Electric filters, Passive. T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK1322.6 Electric power-plants T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK2861 Electric relays. Protective relays--Security measures. |
| Divisions: | Faculty of Intelligent Electrical and Informatics Technology (ELECTICS) > Electrical Engineering > 20201-(S1) Undergraduate Thesis |
| Depositing User: | Melati Listiya Mumpuni |
| Date Deposited: | 26 Jan 2026 09:29 |
| Last Modified: | 26 Jan 2026 09:29 |
| URI: | http://repository.its.ac.id/id/eprint/130367 |
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