变压器保护装置中差动保护的原理及定值设定

On Differential Protection Principles and Calibrated Value Setting of Transformer’s Protector

现武汉市各大型泵站主变压器的保护装置正在逐步实现微机化。本文以实际工作中遇到的变压器微机差动保护装置,通过对原理的分析探讨它们的具体应用,差动回路中电流的相位校正方式,差动保护动作依据和定值整定的计算方法,提出了应用中需注意的相关问题。

The current transformer protectors at each large pumping station in Wuhan are progressively controlled by Microcomputers.The paper discusses specific utility of transformer differential protectors that we deal with in everyday work by analysis of their work principles,current phase correction method in differential circuit,basis of differential protection and calculation method of the value setting,and further puts forward some issues that need careful attentions in the application.