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专利名称：Multi-phase current monitoring device发明人：Bernhard Hoffmann申请号：US07/697418申请日：19910509公开号：US05283543A公开日：19940201
摘要：An overcurrent relay device is provided for monitoring current in a multi-phasecurrent system including separate conductors each carrying a respective one of thecurrent phases between a multi-phase current source and a load. The current systemincludes a system switch having a displaceable contact for switching the multi-phasecurrent on and off. A plurality of electromagnets are provided, each including a magneticcore having a core pole and being associated with a respective one of the conductors forgenerating a magnetic attraction force in the vicinity of the core pole. The core poles allface in the same direction. An armature is rotatably mounted adjacent to the core polesand gaps are defined between the armature and the respective core poles so that themagnitude of a magnetic attraction moment on the armature generated by eachelectromagnet is the same for a given magnitude of the multi-phase current. Thearmature is disposed for moving the displaceable contact of the system switch forswitching off the multi-phase current when the magnitude of the multi-phase currentexceeding a predetermined trip value. A mounting mechanism mounts the armature forrotation about a point for presenting a restoring moment on the armature for returningthe armature to a predetermined position defining the gaps, wherein the restoringmoment presented by the mounting mechanism corresponds to the sum of the magnetic
attraction moments on the armature generated by the respective current phases whenthe magnitude of the multi-phase current equals the predetermined trip value.
申请人：MAGNET-BAHN GMBH
代理机构：Spencer, Frank & Schneider
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