Testing the protection equipment on dynamic simulation test systems is very valuable not only for founding the software bugs and design deficiency of protection but also for performance and characteristics understanding. To strictly test different kind of protection relay, the test systems must been designed carefully by selecting the connection and parameters of the system. The test items are designed specially for every kind of protection. This paper introduces some special technical requirements in China, and important test items for different protection. Several ideas and algorithms of some protections are also compared in this paper, such as power swing blocking method in line protection, current transformer saturation countermeasure in the transformer and bus-bar protection, inrush current. blocking method in transformer protection, current transformer one phase open detection method and etc. Several problems appeared in the test and the reason of these problems are described and analyzed in this paper.
