In power systems, successive operation is a key principle of relay coordination. Protective relays are arranged so that the relay nearest to the fault location operates first, isolating only the affected section. If the fault is not cleared by the first relay, the next relay in the upstream sequence operates after a predetermined time delay. This ensures selectivity, minimizing the area of power interruption and maintaining system stability .
Successive operation is typically implemented using time-graded protection:
The successive operation of relays:
In a radial distribution network, an overcurrent relay at the end of a feeder is set to operate first. If the fault persists, the relay at the substation operates after a longer delay. This stepwise tripping ensures that only the faulty section is disconnected, while the rest of the network continues to operate normally . In summary, successive operation of relay protection is the coordinated, sequential activation of relays to isolate faults efficiently, ensuring selectivity, reliability, and minimal disruption in power systems.
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