变压器保护运行不良的反思

国内变压器保护正确动作率长期偏低，有历史上技术方案失误的问题，也有目前变压器差动保护用TA的选型设计问题。文中阐述了零序差动保护的优点，要求推广应用。介绍了后备阻抗保护对变压器绕组短路灵敏度很低。要求对变压器保护的原理作全面清理、正本清源，从原理方案上研究新的变压嚣保护方案。

Consideration on the Improper Operation of Transformer Protection

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.