Electronic Theses and Dissertation

Abstrack- Laporan ini membahas sistem proteksi radial return oil pada turbin Pembangkit Listrik Tenaga Uap (PLTU) Lhoknga 2×16,5 MW milik PT Solusi Bangun Andalas dan dikelola oleh PT Bukit Energi Servis Terpadu. Fokus utamanya adalah penggunaan sensor suhu RTD (Resistance Temperature Detector) dalam memantau suhu oli pelumas yang kembali dari bantalan radial turbin sebagai bagian dari sistem proteksi untuk mencegah overheating dan menjaga keandalan turbin. Kegiatan magang dilakukan melalui metode observasi langsung, wawancara teknisi dan operator, serta studi literatur. Hasil pengamatan menunjukkan bahwa sensor RTD berperan penting dalam deteksi suhu secara real-time, terhubung dengan sistem kontrol (PLC/HMI), dan dikalibrasi secara berkala untuk memastikan akurasi. Proses pengukuran dilakukan dengan multimeter dan perhitungan resistansi berdasarkan rumus dasar RTD. Data suhu yang diperoleh digunakan untuk mengaktifkan alarm atau sistem shutdown otomatis saat melebihi ambang batas, guna mencegah kerusakan turbin. Laporan ini juga menguraikan troubleshooting dan kendala teknis yang ditemukan selama pengamatan. Dengan diterapkannya sistem ini, keandalan dan keselamatan operasi turbin PLTU dapat terjaga secara optimal.

Kata Kunci: RTD, Proteksi Turbin, PLTU Lhoknga, Suhu Oli, Sistem Kontrol, Kalibrasi Sensor.

This report discusses the radial return oil protection system used in the steam turbine of the 2×16.5 MW Lhoknga Power Plant, owned by PT Solusi Bangun Andalas and operated by PT Bukit Energi Servis Terpadu. The main focus is on the application of RTD (Resistance Temperature Detector) sensors to monitor the temperature of the lubricating oil returning from the turbine’s radial bearing, as part of the protection system designed to prevent overheating and ensure turbine reliability. The internship activities involved direct observation, interviews with technicians and operators, and a literature review. Observations showed that RTD sensors play a critical role in real-time temperature monitoring. These sensors are connected to the control system (PLC/HMI) and are regularly calibrated to maintain accuracy. Temperature measurements are taken using a multimeter and calculated based on the basic RTD resistance formula. The temperature data collected is used to trigger alarms or automatic shutdowns if it exceeds the set threshold, helping to prevent turbine damage. This report also highlights troubleshooting efforts and technical challenges encountered during the observation period. The implementation of this system contributes significantly to maintaining the safety and reliability of the turbine operation at the PLTU. Keywords: RTD, Turbine Protection, Lhoknga Power Plant, Oil Temperature, Control System, Sensor Calibration.