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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Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Tokyo Shibaura Electric Co LtdfiledCriticalToshiba Corp
Priority to JP15693176ApriorityCriticalpatent/JPS5380540A/en
Publication of JPS5380540ApublicationCriticalpatent/JPS5380540A/en
PURPOSE: To protect a system which generates higher harmonic wave at a troubhe time, by combining phase comparing relay system and higher harmonic wave detecting relay, and imputting sum current of two circuit lines.