Matlab Simulink, Simulink relay protection application, simulation of relay protection in Simulink.
Inverse time delays are used to implement protections, the response time of which depends on the value of the input quantity. The use of inverse time delays can reduce the trip time of close short circuits with high currents, while ensuring selectivity of protection.
When implementing relay protection algorithms, RS flip-flops are often used. A RS flip-flops is a nonlinear element whose output signal can be in one of two stable states depending on the input signals. The most commonly used RS flip-flop has 2 inputs: S – set (to set the output value) and R – reset (to reset the output value).
Emergency components – parameters that occur during any switching in the electrical system. They are one of the most informative values and are used in highly sensitive protection functions, for example, to implement blocking during swings.
Symmetric components are very important parameters used in relay protection to implement protection of various equipment. They allow you to implement more sensitive and specific types of protection.
Impedance relay is another type of relay used in relay protection. The difference of this relay is that it is a relay with two input quantities, and its operation is determined by the input value (measurement) falling into a certain response characteristic. The measurement in this case is the complex resistance Z.