Oleh karena kebutuhan operasi relai pada gardu induk 150 kV sangat vital, sistem AC-DC diharuskan mampu beroperasi dengan handal dan stabil. Penormalan sistem AC-DC jika terjadi anomali dilakukan secara manualsesuai standar operasi yang berlaku. Pada prosedur manual, GIS 150 kV Gunung Sahari memiliki keterbatasan untuk memantau sistem AC-DC diluar jam kerja Gardu Induk Patroli (GIPAT) seperti pada malam hari dan hari minggu. GIS 150 kV Gunung Sahari sudah menerapkan karya inovasi yang mengubah sistem manual menjadi IoT. Karya inovasi dinamakan Transmission Online Monitoring Catu Daya (TOMCAD). Penelitian ini dalah penelitian terapan dengan pendekatan kualitatif. Pada proses penelitian, diambil latency delay transmisi data dari alat menuju telegram serta durasi penormalan sebelum dan setelah terpasangnya alat. Efektivitas alat dilihat dari kemampuan responsif, durasi penormalan, dan latency delay transmisi data. Pada responsif , alat mampu memberikan responsif 100% update, alarm anomali dan alarm normal setelah anomali. Pada pengujian latency delay transmisi data dari alat menuju telegram, nilai delay adalah 297,8 mili detik berdasarkan kategori TIPHON, nilai tersebut berada pada rentang >450 mili detik (kategori buruk). Namun, alat masih lebih unggul dilihat dari aspek kemampuan responsif dan durasi penormalan. Hal ini juga didukung oleh adanya baterai cadangan yang mampu bertahan selama 61,7 jam.

Because the need for relay operation at 150 kV substations is vital, the AC-DC system is required to be able to operate reliably and stably. Normalizing the ACDC system if an anomaly occurs is carried out manually according to applicable operating standards. In manual procedures, Gunung Sahari's 150 kV GIS has limitations in monitoring the AC-DC system outside of the Patrol Main Substation (GIPAT) working hours, such as at night and on Sundays. GIS 150 kV Gunung Sahari has implemented innovative work that changes manual systems into IoT. The innovative work is called Transmission Online Monitoring Power Supply (TOM-CAD). This research is applied research with a qualitative approach. In the research process, the latency delay of data transmission from the tool to Telegram was taken as well as the normalized duration before and after installing the tool. The effectiveness of the tool is seen from its responsive capability, normalization duration, and data transmission latency. In responsive, the tool is able to provide 100% responsive updates, anomaly alarms and normal alarms after anomalies. In testing the latency of data transmission delay from the device to Telegram, the delay value was 297.8 milliseconds based on the TIPHON category, this value was in the range >450 milliseconds (bad category). However, the tool is still superior in terms of responsiveness and normalization duration. This is also supported by a backup battery that can last for 61.7 hours.