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Development of a model of current relay protection in the MATLAB/SIMULINK.

Based on MATLAB / SIMULINK, a model of a radial network with one-way power supply and three radial lines with a complex load at the end of each line is built. The model allows you to study the relationship of processes in the network in the case of normal operation, and in the case of possible damage at different distances from the power supply. The proposed model of the current protection device consists of a three-phase current meter, a switching element and a display. In the dialog box of the device, the primary current of the transformer current, the mains voltage frequency, the multiplicity of the protection tripping current and the tripping time multiplier are set, and the type of the standard curve of the protection tripping time characteristic is selected. A protection device with inverse time delay characteristics measures the RMS value of three-phase AC. The switch-off signal is given from the output of the relay protection device, depending on the time delay. The display shows the operating time of the device, primary and secondary currents and setpoint multiplicity. The performance of the device was evaluated by a three-phase short circuit. As a result of research it is established that the offered model of the relay protection device confirms correct behavior of the relay of the maximum current in various operating modes of a network. The behavior of the protection device indicates that the proposed model can be used in further work to develop algorithms for current protection of lines. To improve the model of the device, it is necessary to investigate the influence of simulation parameters, such as data on power sources, power lines, load and type of damage on the parameters of the protection device. The scientific novelty is the the developed models of the electric network and the device of the maximum current protection with all inverse characteristics of endurance of time provided by the ANSI / IEEE and IEC standards. The practical significance of the work is the possibility of using the model to test the selectivity and sensitivity of protection in the event of changes in network parameters in a wide range and in the case of research in the development and improvement of relay protection devices and training.