Relay coordination principle

Question

Accepted Answer

Relay coordination principle ensures that the protective devices operate in a coordinated manner to isolate the faulted section.

Relay coordination principle is used to ensure that the protective devices operate in a coordinated manner to isolate the faulted section.
It involves selecting the appropriate time-current characteristic curves for the protective devices.
The aim is to ensure that the protective device closest to the fault operates first, followed by the next protective device in line.
This helps to minimize the extent of the fault and reduce the damage to the equipment.
For example, in a power system, the protective devices such as fuses, circuit breakers, and relays are coordinated to ensure that the faulted section is isolated quickly and safely.

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