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《Electric Power Automation Equipment》 2001-10
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Consideration on the Improper Operation of Transformer Protection

WANG Wei jian (Tsinghua University, Beijing 100084, China)  
The correct operation rate of transformer protection is low for a long time in China. It can be traced back to the inexpedience of historical technical scheme, but also the erroneous selection of TA for the transformer differential protection. The advantages of zero sequence differential protection are expounded, and it is worth to promote its application. It is described that the sensitivity of impedance back up protection for transformer wind short circuit is very low. To radically reform the theory of transformer protection and to study on new transformer protection scheme are suggested.
【CateGory Index】: TM407
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