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1.发明授权METHOD AND APPARATUS FOR DETECTING FAULTS IN AC TO AC, OR DC TO AC POWER CONVERSION EQUIPMENTS WHEN THE EQUIPMENT IS IN A HIGH IMPEDANCE MODE 有权方法和装置在承认错误的AC-AC或DC-AC转换设备时，在高阻抗模式下的装备
公开(公告)号：EP1661233B1
公开(公告)日：2012-10-24
申请号：EP04782069.1
申请日：2004-08-24
Applicant: ABB Inc.
Inventor： VALLINMAKI, Alpo K. , KARRAKER, Douglas , TYCZKOWSKI, Dennis
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2.发明公开METHOD AND APPARATUS FOR DETECTING FAULTS IN AC TO AC, OR DC TO AC POWER CONVERSION EQUIPMENTS WHEN THE EQUIPMENT IS IN A HIGH IMPEDANCE MODE 有权方法和装置在承认错误的AC-AC或DC-AC转换设备时，在高阻抗模式下的装备
公开(公告)号：EP1661233A1
公开(公告)日：2006-05-31
申请号：EP04782069.1
申请日：2004-08-24
Applicant: ABB Inc.
Inventor： VALLINMAKI, Alpo K. , KARRAKER, Douglas , TYCZKOWSKI, Dennis
IPC: H02M1/00
Abstract: A system for use in ac to ac or dc to ac power conversion equipment to detect faults in an inverter when the inverter (18) is in a high impedance mode. The system detects ground faults or cross wiring conditions by converting the inverter outputs to digital signals and evaluating the frequencies of the resulting signals. The system keeps the inverter in the high impedance mode until after it has been determined that neither of the described abnormal statuses exist. The system tests for both of the abnormal statuses on power up and thereafter tests only for a ground fault whenever the inverter switches are disabled.
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