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example of the voltage relay is, it has a fundamental voltage of 400V. When it reaches 410V or over, the relay tripped(overvoltage). when the relay is 390 or below, the relay tripped(undervoltage). the relay is connected to a circuit breaker. it is a single phase relay. the input is the sinwave(rms. there is a harmonic connected to the input because the circuit is to check the the graphs of harmonic distortion. the RLC load is connected as an output.
this is the characteristic for the over voltage t=k>*a/[(b*(U/Us -1)-0.5)^p] + c
t = operate time [s] k> = time multiplier, 0.4 U = measured voltage [V] U> = set start voltage [V] a = constant 480 b = constant 32 c = constant 0.035 p = constant, 2
undervoltage t=k<*a/[(b*(1-U/Us)-0.5)^p] + c
t = operate time [s] k< = time multiplier, 0.4 U = measured voltage [V] U< = set start voltage [V] a = constant 480 b = constant 32 c = constant 0.055 p = constant 2