short circuit modelling at time t=5sec feeding a Induction motor

Hi,

I don't know how to model an short circuit feeding the mathematical Simulink model of an Induction motor. I would lile to switch at time t=5sec from the standard three phase 380V feeding voltage to an short circuit and se how the current of the model of IM varies in time.

I think that it should behave like a generator when the short circuit occures in the feeding line.

Could you possibly help me to model this?

I send you some pics for more clarity:

Here I have tried to switch the incoming voltage to zero at time t=5 sec but it's not the same as an shortciruited voltage source.

Could anyone help me ?

Thanks

Answer 1

[Vinay]

Hi @JOSIP,

The 'Three-Phase Fault' block can be used to model short-circuit behavior in a system. Initially, the fault block remains open and, when triggered, it creates a low-resistance path between the phases and ground.

The parameter 'Ron' represents the impedance of the arc through which the fault current flows. It effectively acts as a low-resistance switch between the phases and ground (or between phases), activated at the specified fault time.

Please refer to the below documentation of 'Three - Phase' for more details:

https://www.mathworks.com/help/sps/powersys/ref/threephasefault.html

I hope this helps!