Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Hitachi Ltd
Original Assignee
Hitachi Ltd
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Filing date
Publication date
Application filed by Hitachi LtdfiledCriticalHitachi Ltd
Priority to JP9754575ApriorityCriticalpatent/JPS5221636A/en
Publication of JPS5221636ApublicationCriticalpatent/JPS5221636A/en
PURPOSE: By judging the operation by paying the attention to the phase difference between the voltage of positive-phase-sequence which corresponds to a onel line earthed trouble at the direct earthing system and the voltage of negative-phasesequence of zero-phase-sequence, to get the relay of being possible to detect securely.
COPYRIGHT: (C)1977,JPO&Japio
JP9754575A1975-08-131975-08-13Detecting relay of one line earthed trouble
PendingJPS5221636A
(en)