Ningrum, Anisa Kusuma (2025) Evaluasi Sistem Isolasi Tegangan Tinggi Sistem Transmisi 150kv PT. Vale Indonesia Terhadap Fenomena Petir Sambaran Langsung Dan Backflashover Pada Area Batuan Ultrabasic Dengan Mengoptimalkan Besaran Tahanan Pentanahan”. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Saluran transmisi 150kV pada sistem kelistrikan PT. Vale Indonesia merupakan suatu sub-sistem yang sangat penting guna menjaga keberlangsungan proses produksi. Pada kurun waktu 5 (lima) tahun terakhir, PT. Vale Indonesia sering mengalami blackout akibat saluran transmisi yang tersambar petir. Evaluasi sistem isolasi tegangan tinggi pada sistem transmisi PT. Vale Indonesia sangat diperlukan dikarenakan Lokasi sistem ini berada pada area tanah ultrabasic yang memiliki kadar logam tinggi yang mengakibatkan intensitas petir cukup tinggi dan besar. Untuk meminimalisir peningkatan resiko terhadap sistem akibat sambaran poetir langsung dan meminimalisir terjadinya back-flashover atau flashover pada saluran transmisi, maka pengoptimalan besaran tahanan tanah menjadi hal yang sangat penting dilakukan. Analisa ini dilakukan dengan memodelkan saluran transmisi dengan pendekatan multi-story dimana setiap parameternya mengikuti parameter aktual sistem dan Analisa dilakukan di aplikasi EMTP-ATP. Berdasarkan hasil analisa didapati bahwa semakin besar nilai tahanan pentanahan pada berbagai macam besaran arus impuls petir, mengakibatkan kenaikan tegangan yang signifikan pada sistem transmisi. Sehingga, meningkatkan kemungkinan terjadinya kerusakan isolator di sepanjang jalur transmisi.
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The 150 kV transmission line within PT. Vale Indonesia's electrical system is a critical subsystem for maintaining continuous production processes. Over the past five years, PT. Vale Indonesia has experienced frequent blackouts due to lightning strikes on the transmission line. Given the location of the system in an ultrabasic rock area with high metal content, resulting in high lightning intensity, a comprehensive evaluation of the high voltage insulation system is imperative. To mitigate the increased risk to the system from direct lightning strikes and minimize the occurrence of backflashovers or flashovers on the transmission line, optimizing footing resistance is crucial. This analysis was conducted by modelling the transmission line using a multi-story approach, where each parameter aligns with actual system parameters. The analysis was performed using the EMTP-ATP application. Results indicated that as footing resistance increases across various magnitudes of lightning impulse current, there is a significant voltage rise in the transmission system. Consequently, this increases the likelihood of insulator failure along the transmission line.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | (petir, koordinasi isolasi, backflashover, tahanan pentanahan), lightning, insulation coordination, flashover, grounding resistance |
| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK201 Electric Power Transmission |
| Divisions: | Faculty of Intelligent Electrical and Informatics Technology (ELECTICS) > Electrical Engineering > 20101-(S2) Master Thesis |
| Depositing User: | Anisa Kusuma Ningrum |
| Date Deposited: | 06 Feb 2025 05:23 |
| Last Modified: | 06 Feb 2025 07:37 |
| URI: | http://repository.its.ac.id/id/eprint/118485 |
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