Transformer differential protection

专利名称：Transformer differential protection发明人：Bogdan Z. Kasztenny,Normann Fischer申请号：US12561962申请日：20090917公开号：US08553379B2公开日：20131008

专利附图：

摘要：Transformer differential protection is provided by measuring a plurality ofcurrents corresponding to a first set of windings and a second set of windings of atransformer, and compensating the currents based on their respective flows througheither the first set of windings or the second set of windings. The compensated currents

may be intentionally augmented to compensate for magnetizing inrush and/or stationaryoverexcitation conditions associated with the transformer. Augmentation based onstationary overexcitation, for example, may be based on either harmonic restraint or anaddition of a V/Hz ratio to a restraining signal. A complex current ratio is calculatedcorresponding to the plurality of compensated currents. The complex current ratio maybe based on a two-terminal equivalent power apparatus. Then, an alpha plane analysis isapplied to the complex current ratio. Based on the alpha plane analysis, a powerapparatus that includes the transformer is selectively tripped.

申请人：Bogdan Z. Kasztenny,Normann Fischer

地址：Markham CA,Colfax WA US

国籍：CA,US

代理机构：Stoel Rives LLP

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