Development of digital protective relay tester under IEC61850

The novel tester of digital protective relay based on IEC61850 is proposed in this paper. The tester's system architecture is based on multi-CPU (CPU+DSP) high speed hardware platform and real time operation system, it can receive and sample the analog test data on time, which is then converted into digital test data according to IEC61850 protocol. This tester also has the GOOSE trip signal which receive, the analysis digital protection device sends out,and the circuit breaker position contact signal encoding, the group frame, transmits GOOSE the switch status to give the digitized relay protection installment and so on. The transient simulation testing platform is established, which can construct the electric quantity of each test cycle in the period of protection's operation for sending under IEC61850. Due to the special recursive algorithm and detecting the action of protection,the tester can complete the closed loop experiment of tripping-reclose-tripping forever. With the help of man machine interface, it's very convenient to performance dynamic simulation test, static simulation test and transient simulation test. This tester also get the fine results in the check of transient simulation test.