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        "http://www.w3.org/2000/01/rdf-schema#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." ] ,
        "http://www.w3.org/2000/01/rdf-schema#seeAlso" : [ "http://dbpedia.org/resource/Power-system_protection" ] ,
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        "http://dbpedia.org/ontology/thumbnail" : [ "http://commons.wikimedia.org/wiki/Special:FilePath/Protective_Relays_Hydroelectric_Station.JPG?width=300"] } } }
