Rancang Bangun Alat Monitoring Breaker Motor 3 Fasa Berdasarkan Konfigurasi Breaker PLTU UBP Priok Dengan Pengukuran Keserempakan Serta Tegangan Secara Real-Time Berbasis Modul Optocoupler AC Serta Sensor ZMPT101B Dan Internet Of Things

Melissa Rahmawati Yusuf (Universitas Diponegoro)
Eko Ariyanto (Universitas Diponegoro)

GEMA TEKNOLOGI
Vol 23, No 2 (2025): October 2024 - April 2025

This monitoring system was designed to automatically detect breaker status based on 24V DC voltage, utilizing a 25V DC sensor. The system is capable of transmitting real-time data with an average response time of 9 seconds. The ZMPT101B voltage sensor used in the setup demonstrated low error rates, with 0.97% for phase R, 0.91% for phase S, and 0.58% for phase T. Additionally, an AC optocoupler module was employed to detect 220V AC, enabling accurate synchronization measurement. Results indicate that synchronization during the "on" condition is highly accurate, although a slight delay was observed during the "off" condition due to residual current in the signal amplification transistor (S8050) located within the module. Testing at the Priok UBP Combined-Cycle Power Plant confirmed that the system meets the company's configuration standards, with an obtained the best value of 2 ms with average time of  3.2 ms, suggesting that the breakers operate within optimal parameters. Overall, the system performs effectively and aligns with the company’s operational requirements.