一种智能站精简电流纵差保护改进方法

A Simplified Currents Scheme for Improved Differential Protection in Smart Substations

摘要: 基于电子式互感器独立采样环节，建立电子式互感器至合并单元延时模型，提出一种改进的智能变电站线路纵联差动保护方法，建立合并单元精简电流数据扩展出口，不经本端保护装置直接远传三相电流数据至对端保护装置以降低电流数据处理延时。分析及实验证明，该方式可降低220 kV智能变电站纵联差动保护数据延迟2~3 ms。

Abstract: This paper presents a time delay evaluation method based on electronic transformer independent sampling. A time delay reduction method is proposed to decrease the time lag of the current data in the line longitudinal differential protection. It is in use of extended port of current merging unit and transmits the simplified current data to the other side of transmission line protection device directly. The analysis and test results show that the proposed method could reduce the time delay in 220 kV line longitudinal differential protections from 2 milliseconds to 3 milliseconds.