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High Voltage Equipment MaintenanceI: Relay Protection
Fault protective functions, including distance functions,
voltage-restrained overcurrent functions, or voltagecontrolled
overcurrent functions.
Loss-of-field relays.
Volts-per-hertz relays.
Negative sequence overcurrent relays.
Overvoltage and under voltage protection relays.
Stator ground relays.
Communications-based protection systems such as transfer-trip
systems.
Generator differential relays.
Reverse power relays.
Frequency relays.
Breaker failure protection.
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