变压器主保护新判据的研究

详细信息

Research of a New Criterion of Main Protection of Transformer

1.
School of Electrical and Electronic Engineering of East China Jiaotong University, Nanchang 330013, China.2.College of Electrical and Information Engineering of Hunan University, Changsha 410082, Ch

摘要: 针对传统的变压器主保护无法正确识别变压器励磁涌流与内部故障电流的问题，提出了一种基于差动电流间断角的变压器主保护新判据。该判据采用sym4小波变换对变压器励磁涌流及内部故障电流信号进行处理，得出两者在d1尺度下间断角的明显差异特征，从而可正确区分变压器励磁涌流与内部故障电流。仿真结果验证了该判据的有效性。
- 变压器主保护 /
- 小波变换 /
- 励磁涌流 /
- 故障电流 /
- 间断角
Abstract: In view of problems that traditional main protection of transformer cannot identify inrush current and internal fault current of transformer, the paper proposed a new criterion of main protection of transformer based on dead angle of differential current. The criterion uses sym4 wavelet transform to process inrush current and internal fault current of transformer and obtains obvious difference characteristics of dead angles of the both under d1 scale, so as to identify inrush current and internal fault current of transformer correctly. The simulation result validated effectiveness of the criterion.
- main protection of transformer, wavelet transform, inrush current, fault current, dead angle