Automatic wire changing method between relay protection device and relay protection tester

An automatic wire changing method between a relay protection device and a relay protection tester is provided with a switching expansion device used for expanding at least two groups of input power supplies of the relay protection tester into at least three groups of output current sources and transmitting the output current sources to the relay protection device; and the background computer is used for controlling the switching expansion device and the relay protection tester. According to the automatic wire changing method between the relay protection device and the relay protection tester, wire changing is not needed during testing, so that the workload is reduced, wire changing errors are avoided, and conditions are provided for full-automatic testing. 一种继电保护装置与继电保护测试仪之间的自动换线方法，设置有：切换扩展装置，用于将继电保护测试仪的至少两组输入电源扩展成至少三组输出电流源，并将输出电流源输送至继电保护装置；后台电脑，用于控制所述切换扩展装置以及继电保护测试仪。本发明的继电保护装置与继电保护测试仪之间的自动换线方法在测试时不用进行换线，从而减少工作量及避免了换线出错，为全自动测试提供条件。