变压器差动保护中励磁涌流产生的机理分析与建模

Mechanism Analysis and Modeling of Excitation Inrush Current in Transformer Differential Protection

变压器空载投入时会产生很高的励磁涌流,造成差动保护装置误动作,分析涌流波形可以设法抑制误动。对变压器差动保护中励磁涌流产生的机理进行分析,分别对单相变压器和三相变压器的励磁涌流进行建模,并对其进行实验验证。实验结果表明:所建模型符合涌流的特点,可用于变压器励磁涌流的计算机建模。

The overload transformer operation will generate high excitation inrush current and cause differential protection devices wrong operation. Analyze inrush current waveform to find out method to constrain wrong operation. Analyze generation mechanism of excitation inrush current in transformer differential protection. Then establish inrush current models of single-phase transformer and three-phase transformer separately. Validate the model by test. The test results show that the models accord with the characteristics of the flow, and can be used for computer modeling of transformer excitation inrush current