eTools Home : Electric Power Overview | Scope | SH Topics Page | Credits
Electric Power eTool

Substation Equipment: Relays

Relays
A relay is a low-powered device used to activate a high-powered device. Relays are used to trigger circuit breakers and other switches in substations and transmission and distribution systems.

Figure 1. Substation control panel relays
Figure 1. Substation control panel relays
Figure 2. Relay and control panel
Figure 2. Relay and control panel
eTools Home : Electric Power Overview | Scope | SH Topics Page | Credits