Rancang Bangun Sistem Proteksi Over Current Relay Dengan Karakteristik Inverse Sesuai IEC 60255 Terintegrasi IoT Untuk Monitoring Jarak Jauh

  • Anissa Suprihatin State University Of Malang
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DOI https://doi.org/10.31544/jtera.v11.i1.2026.171-180
Published 2026-06-26
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Abstract

This research aims to design and develop a prototype overcurrent relay (OCR) protection system based on the ESP32 microcontroller that implements inverse-time characteristics in accordance with IEC 60255 and is integrated with the Internet of Things (IoT) for remote monitoring. The work is motivated by the need of medium-scale industries for reliable yet economical overcurrent protection devices, since conventional industrial OCRs are generally expensive and not fully equipped with real-time monitoring capabilities. The proposed system employs a PZEM-004T module to measure electrical parameters including voltage, current, power, energy, frequency, and power factor. These measurements are processed by the ESP32 to calculate the Plug Setting Multiplier (PSM) and determine the relay operating time based on three IEC 60255 inverse curves, namely Standard Inverse, Very Inverse, and Extremely Inverse. Trip decisions are executed through a power relay and buzzer as alarm indicators, while electrical parameters and protection status are displayed on an I2C 20×4 LCD and transmitted in real time to the Blynk IoT platform, enabling monitoring and remote reset via smartphone. Experimental tests on resistive and dynamic loads within a current range of 1–20 A were conducted to evaluate sensor accuracy, conformity of trip time with theoretical inverse curves, and the reliability of IoT communication. Overall, the developed prototype is expected to serve as a low-cost digital OCR alternative that is more informative, flexible, and easy to integrate into protection systems for medium-scale industrial loads.

Keywords

arus lebih ESP32 inverse IoT proteksi.

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Vol. 11 No. 1: June 2026

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How to Cite

[1]
“Rancang Bangun Sistem Proteksi Over Current Relay Dengan Karakteristik Inverse Sesuai IEC 60255 Terintegrasi IoT Untuk Monitoring Jarak Jauh”, JTERA, vol. 11, no. 1, pp. 181–188, Jun. 2026, doi: 10.31544/jtera.v11.i1.2026.171-180.