Feeders: Relays are installed on medium-voltage feeders to protect distribution lines from overcurrent, short circuits, and ground faults. They ensure that only the faulted section is isolated, maintaining system stability and minimizing outages . Transformers: 10kV relays protect power transformers against overcurrent, differential faults, and thermal overloads. Differential relays are commonly used to detect internal transformer faults, while overcurrent relays provide backup protection . Buses: Busbar protection relays monitor current imbalances and detect faults within bus sections. They are critical in substations to prevent cascading failures and maintain continuity of supply . Motors and Generators: Relays safeguard medium-voltage motors and generators from overloads, phase loss, and short circuits. They are often coordinated with motor starters or generator circuit breakers . Transmission Lines: Relays on 10kV lines detect line faults and initiate tripping of circuit breakers to isolate the affected section. Distance, overcurrent, and directional relays are commonly used depending on line configuration .
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