Substation types — AIS, GIS, hybrid, collector, switching, distribution, and transmission — plus the major equipment that fills them: breakers, disconnects, busbars, arresters, capacitor banks, reactors, and grounding.
Most substation overviews describe equipment in isolation. This module ties each piece to the decision that actually selects it: why a breaker's interrupting rating gets chosen with deliberate margin over the calculated fault current, why a ring bus and a single bus can use the identical breaker count yet deliver very different reliability, and why the same station can need both a capacitor bank and a shunt reactor at opposite ends of its daily load curve.
By the end of this module you should be able to explain why a ground grid that keeps touch and step voltage safe inside the fence can still produce a hazardous ground potential rise beyond it — a distinction that governs how every communication circuit crossing a substation boundary gets designed.