专利名称：CURRENT DIFFERENTIAL PROTECTION
ARRANGEMENT
发明人：SCHIEL, LUDWIG, DR.,NOACK,
STEFFEN,SCHUSTER, NORBERT
申请号：EP95933317.0申请日：19950926公开号：EP0783788B1公开日：19980708
摘要：A current differential protection arrangement for an electric energy supply unithas a measurement value pre-processing device and an evaluating device that checkswhether the calculated differential and stabilisation current values lie in a locking or in atriggering range based on a predetermined relation between the differential current anda stabilisation current (characteristic reaction curve). An additional stabilisation range isprovided in the locking range. In order to prevent such a protection device from causing atime-locked blocking state following an outer defect and causing saturation of theconverter, the evaluating device (21) has a checking device (30) in a stabilising circuit (25)that checks whether the calculated current values define a point in the additionalstabilisation range (31). If that is the case, a locking signal is generated to activate alocking device (37) arranged downstream of the checking device (30). When the detectedcurrent values subsequently define for the first time a point located outside of theadditional stabilisation range (31), a time function element (40) is switched whose outputis connected to a resetting input of the blocking device (38).
申请人：SIEMENS AKTIENGESELLSCHAFT,SIEMENS AG,SIEMENS AKTIENGESELLSCHAFT
地址：DE
国籍：DE
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