智能型继电保护测试系统下位机的设计

design of an intelligent testing system’s slave computer for relay protection is introduced in this paper,the slave computer and the host computer constitute the testing system.The slave computer receives datas and commands from the host computer through the USB device.meantime,detectes the state of the objective that is being tested,and then,processes it in right way.The design can be used to test the required testing items of present protective devices and its measuring accuracy is enough.