Development of dynamic test system for digital relay protection based on IEC61850 standards

In recent years, electronic mutual-inductor and IEC61850 serial standards are adopted in digital substation. Once electronic mutual-inductor has been used, the input signals of relay protection and other secondary devices are not the traditional analog quantities any more. The simulation system cannot offer such interface up to now, so the secondary devices which are based on electronic mutual-inductor in digital substation cannot be tested and researched in this way. A kind of testing system aiming to real-time digital relay protection is introduced in this paper. By adding secondary interface to the primary simulation system, such as ADPSS (invented by China Electric Power Research Institute), a closed-loop testing system which is based on IEC61850 standards is established. The testing results verify that the system has great significance on improving the application of digital substation, and it has great use value.