Chapter 8: Distance and overcurrent relay coordination
Abstract
The main purpose of a protection relay is to detect and isolate the faulted element as soon as possible, so that the impact with the rest of the system is minimized, leaving undamaged elements intact. The protection principle is used depending on the voltage level of the electrical network, while the application criterion is based on the protection performance and related cost. Thus the directional overcurrent relays (DOCRs) are widely used in subtransmission systems as backup of line differential relays or pilot protection, and in distribution as both primary and backup protection.
Although the DOCRs have nonlinear characteristic curves, the coordination of a pair of relays ...
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