Fig. 4 shows the hardware composition of the protection system
simulation. The real protective relay is used for the fault detection
of the model distribution system. There are OCR, OCGR and the
reclosing function included. The users can input all parameters of
circuit except the circuit breaker on/off signals of the protective relay
by typing in GUI (Graphic User Interface). Therefore, the circuit
breaker control signals are directly delivered from the real protective
relay during the fault conditions. The setting parameters of
OCR, OCGR and reclosing sequence shown in Table 2 are used in
the simulation.