Single phase and three phase capacitive-load switching in transmission & distribution systems

Interruption of capacitive currents

The interruption of capacitive currents is a usual switching case, unlike the making and breaking of fault currents. The usual cases, in which a capacitive current is switched, are switching of unloaded overhead transmission lines, local substation components, cables, capacitor banks and others.

First, let’s explain the basic nature of these cases in which a capacitive current is switched and then in details 1-phase and 3-phase cases.

Contents:

1. Capacitive-load switching cases
   1. Switching of unloaded overhead transmission lines
   2. Switching of local substation components
   3. Switching of cables
   4. Switching of capacitor banks
2. Single-phase capacitive-load switching
3. Three-phase capacitive-load switching