A relay protection dynamic testing system based on new type real-time digital simulation is presented. The system uses RT-Linux and high performance industrial control computer to compute, applies the Matlab/Simulink to develop the model file, adopts PCI interface card to I/O, employs special switch grouping technology to output peer-to-peer data, and uses flexible configuration program to achieve auto-test. It also can solve many problems, such as the calculation time jitter, simulation numerical oscillation, multi bays synchronous output and so on. The system is suitable for real-time dynamic simulation test of conventional protection, intelligent protection and station domain protection.%研究了一种用于继电保护动模测试的新型实时数字仿真系统。该系统将实时 Linux 与高性能工控机相结合，用Matlab/Simulink进行模型开发，用PCI接口卡进行传统I/O输出，用专用交换机分组技术实现点对点多间隔数据输出，通过后台的灵活配置实现自动测试。同时解决了计算时间抖动、仿真数值振荡、多间隔同步输出等难题。该系统适用于常规保护、智能化保护及站域保护的实时仿真动模测试。
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