The ongoing digitalization of secondary distribution substations enables grid modernization and facilitates the integration of distributed energy resources. Although prior efforts have primarily focused on medium-voltage substations, the low-voltage segment of secondary substations is emerging as an active element in the smart grid. A practical architecture for the digitalization of secondary substations is presented. The system utilizes a complete measurement chain—from Low-Power Instrument Transformers to intelligent devices including time relays, monitoring relays, interface protection units, and harmonic analysis modules—and integrates these components within a SCADA environment. The proposed modular and interoperable design provides real-time visibility, protection, and control extending to the final node of the network. Once the measurement infrastructure is established and high-quality data becomes available, advanced AI-based analytics can be applied to enhance operational reliability and power quality. The overall framework forms the basis of a data-driven smart grid in which algorithmic intelligence supports utility decision-making.
Turning local substations into intelligent nodes: A practical path toward AI-driven grid operation
Internal arc faults don’t happen without a trigger. They are the result of certain weaknesses or mistakes that compromise the insulation or air gap inside the switchgear.
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