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.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi LtdfiledCriticalHitachi Ltd
Priority to JP1134876ApriorityCriticalpatent/JPS5295041A/en
Publication of JPS5295041ApublicationCriticalpatent/JPS5295041A/en
PURPOSE: To protect motor in such a manner that average input power to motor is detected and switchgear is opened when it is decided to be abnormal operation by said detection.