Abstract
To observe the inner operating process of distance protection, a Matlab/Simulink based dynamic simulation system for microprocessor-based distance protection is designed in this paper. As a modularized design, the simulation system is composed of several modules such as fault transient calculation, startup, Fourier algorithm, phase selection, impedance computing and impedance comparison etc. Some typical simulation cases, which focus on the main factors affecting distance relay’s operation, have been simulated with the system. Simulation results show that the system is able to demonstrate the dynamic behaviors of distance protection under different operating conditions.
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