SEL-387在110kV主变差动保护上的应用

Application of the SEL-387 in 110kV Main Transformer Differential Protection

介绍了SEL-387保护装置在110kV主变差动保护上的应用,重点对差动单元的动作逻辑原理、比率差动的电流调整比TAP及变压器联结补偿的原理进行了分析。通过一个工程实例给出了差动保护定值的计算过程,分析了其差动保护误动的原因,并给出了对策。

This article introduces the application of SEL-387 in 110kV main transformer differential protection, it analyses the trip logic principium of differential protection unit, principle of current TAP and transformer connection compensation. At the same time, with the an engineering instance, calculate of differential protection parameter are showed. Analysis and solving action reason of the microprocessor based transformer differential protection.