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fault indicator
A fault indicator is a device which provides visual or remote indication of a fault on the electric power system. Also called a faulted circuit indicator (FCI), the device is used in electric power distribution networks as a means of automatically detecting and identifying faults to reduce outage time.
Overhead indicators are used to visualize the occurrence of an electrical fault on an overhead electrical system. Underground indicators locate faults on an underground system. Often these devices are located in an underground vault. Some fault indicators communicate back to a central location using radio or cellular signals.
== Basic principles ==
During an electrical fault on a grounded system, additional current flows through a conductor, which is picked up by the fault indicator causing a state change on the mechanical target flag, LED, or remote indication device. Ground fault indicators for ungrounded systems sense the vector sum of the current and look for an imbalance indicating a fault on one or more of the three phases.
High-voltage fuses commonly drop down after operating, making it obvious where the fault is.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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