F

failure mode: The observed effect of failure.
farad: Unit of measurement for capacitance.
faraday shield: A grounded metallic barrier that improves the isolation between the windings of a transformer by reducing the leakage capacitance between the primary and secondary transformer windings.
fast tripping (fuse saving): The common utility protective relaying practice in which the circuit breaker or line recloser operates faster than a fuse can blow. It clears transient faults without a sustained interruption but subject s industrial loads to a momentary or temporary interruption.
fault: An unintentional short circuit that causes a failure or interruption in an electrical circuit or a power system.
fault locator: A device or system that indicates where a fault occurred on a power system.
fault, transient: A short circuit on the power system, usually caused by lightning, tree branches, or animals and cleared by momentarily interrupting the current.
feedback: The return of a portion of a device s output to its input.
feeder: An electrical supply line, either overhead or underground, that connects from a generating plant or an interchange point to a load or distribution system.
feeder lockout: Describes the situation when automatic protective devices disconnect a feeder from the power system until manually reconnected, and indicates a serious problem on the power system, usually equipment failure or a broken conductor.
FERC: Federal Energy Regulatory Commission.
ferroresonance: Resonance resulting when the iron core of an inductive component of an inductive/capacitive circuit becomes saturated and increases the inductive reactance with respect to the capacitance reactance.

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