This thesis presents the upgrade of the TP Naselje Za Savo substation from manual operation to an automated system with SCADA supervision and control. For this purpose, a control cabinet with an integrated RTU was designed and built, enabling remote monitoring and control. The work includes schematic design, selection and arrangement of components, and preparation of documentation in accordance with relevant standards. Basic calculations of DC and AC currents, voltage drops, and conductor sizing were carried out, along with the selection of protective devices. The UPS autonomy was also evaluated to ensure continuous system operation during power outages. A catalog of all input and output signals is provided together with their processing rules, as well as the design of the RTU’s internal logic (local/remote switching, interlocks, anti-pumping, communication supervision). The choice of IEC 60870-5-104 communication protocol is explained, as it was selected over IEC 61850 due to compatibility and cost efficiency, with the characteristics of IEC 61850 also presented. The conclusion highlights the practical benefits of the upgrade, including shorter outages, increased reliability and safety, lower operating costs, and defines the remaining steps before final commissioning.
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