中文摘要：

提出一种基于模型的新型变压器主保护判据。分析了/接线变压器基于模型的主保护基本原理及其应用中面临的问题,指出产生这些问题的根本原因。在增设一台侧线圈电流测量CT的基础上提出了按相构成的新型保护判据,该判据可以反映变压器三相线圈漏阻抗不完全相同的现象,无需计算各侧线圈单独的漏阻抗参数,在各种运行状态下具有足够的可靠性和灵敏性。利用ATP仿真软件获得变压器各种运行条件下的实验数据,分析结果表明了所提方法的正确性。

英文摘要：

A novel criterion of transformer main protection based on model is presented. Firstly, the basic theory of the model based main protection of transformer with / connected windings and the problems existing in its application are analyzed, and the primary reason of those problems is pointed out. On the premise that an additional TA is installed to measure the winding current on the delta side, a novel criterion which is associated with each equation separately is presented, which can reflect that the leakage impedances of three windings are not entirely the same. It is needless to calculate the impedances of the windings on each side separately, and there are sufficient reliability and sensitivity under various conditions. The experiment data of transformer under various conditions are obtained by ATP. The correctness of the presented criterion is proved by the experiment results.