Distribution network with renewable energy access has brought challenges to relay protection and automation technology. A test platform of power dynamic simulation is designed

which can be used to analyze ground fault and experimental study of self-healing control technology of distribution network

as well as the system test of automation equipment. Special equipment is developed to carry out fault indicator tests and faulty fault line selection test in grounded systems

and a universal test model of distribution network is set up to contain new energy and microgrid. Experimental results demonstrate the feasibility and effectiveness of the simulation experiment system.