A differential relay is used in the implementation of the basic protections of various equipment: generators, transformers, power lines, etc. The use of a relay with a braking characteristic prevents the non-selective action of the protection.
Simulation of electrical circuits and relay protection in Matlab / Simulink, calculation of electrical circuits.
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.