基于变压器模型的新型变压器保护原理的研究

针对变压器电流保护多年来一直存在的区分励磁涌流和内部故障电流的难题，该文阐述了基于变压器模型的新型变压器保护方案的基本原理，推导出了基于该原理的两绕组和三绕组变压器的动作方程，提出了变压器保护方案。该方案不受励磁涌流的影响，并且避开了变压器难以得到的内部参数。仿真试验结果表明该方案能够可靠、迅速的切除变压器内部故障。

STUDY ON THE NOVEL TRANSFORMER PROTECTION PRINCIPLE BASED ON THE TRANSFORMER MODEL

For the problem of discrimination between inrush current and internal fault current, this paper presents the basic principle of the novel transformer protection method based on the transformer model. Its operation equations of two-winding and three-winding transformer are derived from this principle. And the transformer protection method is presented. The method can be unacted on the inrush current and does not need the internal parameters got difficultly. The results of testing confirmed that the method is able to clear the internal fault reliably and quickly.