About: dbpedia:Protective

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In electrical engineering, a protective relay is a device designed to trip a circuit breaker when a fault is detected. The first protective relays were electromagnetic devices, relying on coils operating on moving parts to provide detection of abnormal operating conditions such as over-current, over-voltage, reverse power flow, over- and under- frequency.

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rdfs:comment	In electrical engineering, a protective relay is a device designed to trip a circuit breaker when a fault is detected. The first protective relays were electromagnetic devices, relying on coils operating on moving parts to provide detection of abnormal operating conditions such as over-current, over-voltage, reverse power flow, over- and under- frequency.
rdfs:seeAlso	dbpedia:Power-system_protection
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thumbnail	http://commons.wikimedia.org/wiki/Special:FilePath/Protective_Relays_Hydroelectric_Station.JPG?width=300

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