Abstract

Reliable electricity is essential for both industrial operations and engineering education, yet most Automatic Transfer Switch (ATS) panels in small-scale facilities still operate as opaque devices that expose only binary status indicators. This paper proposes a Supervisory Control and Data Acquisition (SCADA)-based monitoring framework that turns the ATS panel in the Automation Laboratory of the Department of Electrical Engineering, Politeknik Negeri Manado, into a transparent and measurable system. The framework integrates a three-phase digital power-quality meter, a programmable logic controller (PLC), and a SCADA human-machine interface (HMI) communicating through Modbus TCP/IP. Monitored quantities include voltage, current, frequency, total harmonic distortion (THD), power factor, and active/reactive power on both Power Line Network (PLN) and genset sources. Because the physical installation is still in preparation, the framework is evaluated using a simulation-based model covering six representative disturbance scenarios: PLN outage, frequency deviation, voltage sag, harmonic injection, voltage swell, and three-phase voltage unbalance. The results show that the architecture detects disturbances within sub-second time frames, achieves an average detection accuracy above 96 percent across the tested scenarios, and visualizes power-quality indicators in compliance with IEEE 519 and IEC 61000-4-30. Beyond its technical contribution, the design offers a reproducible and low-cost platform that bridges classroom instruction and industrial practice, and it provides a foundation for future hardware implementation and integration with cloud-based energy management.

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