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公开(公告)号：EP0336943B1
公开(公告)日：1994-11-30
申请号：EP88908844.9
申请日：1988-09-16
申请人： SQUARE D COMPANY
摘要： In phase loss detection circuits a false indication can occur doing the starting, stopping and severe load transitions of a three-phase motor. The present phase loss detection circuit solves this problem by using a circuit (33) to detect the lost of a phase, a comparator (25), a changing capacitor (C5), a peak detection (21) and an overload voltage integrator (38), all of which provide a positive indication of either a phase loss or overload condition. The present phase loss circuit including transient protection which may be used with three-phase motors in a three-phase electrical system.
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公开(公告)号：EP0336943A1
公开(公告)日：1989-10-18
申请号：EP88908844.0
申请日：1988-09-16
申请人： SQUARE D COMPANY
摘要： In phase loss detection circuits a false indication can occur doing the starting, stopping and severe load transitions of a three-phase motor. The present phase loss detection circuit solves this problem by using a circuit (33) to detect the lost of a phase, a comparator (25), a changing capacitor (C5), a peak detection (21) and an overload voltage integrator (38), all of which provide a positive indication of either a phase loss or overload condition. The present phase loss circuit including transient protection which may be used with three-phase motors in a three-phase electrical system.
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