专利名称：Use of a thermal limit curve with a time
overcurrent curve to provide thermal
protection in a protective relay
发明人：Robert E. Morris,Jacob J. Reidt,Brian S.
Zabriskie,Carl V. Mattoon
申请号：US10684046
申请日：20031010
公开号：US20050078425A1
公开日：
20050414
专利附图：
get over you
摘要：An overcurrent protective relay includes means for obtaining current values
from a power line which are adjusted for application to and use by a processor portion of the relay. The processor evaluates the adjusted power line current values against an overcurrent curve by which, as the current increases from a continuous rating, the time to trip decreases. A thermal limit It curve is combined with the time overcurrent curve, the curves being arranged so that the thermal limit curve crosses over the time overcurrent curve at a selected current value. In such a case, the thermal limit curve controls the time to trip for current fault values above the selected current value and the inverse time overcurrent curve controls the time to trip for fault current values below the selected current value.
申请人：Robert E. Morris,Jacob J. Reidt,Brian S. Zabriskie,Carl V. Mattoon
地址：Viola ID US,Spokane WA US,Moscow ID US,Pullman WA US
国籍：US,US,US,US
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