Why circuit breaker in simulink/simscape is not working when open circuit condition?

Answer 1

[Deep]

Hi Arun,

I replicated your model from the screenshot you posted. On running it, the simulation froze after the circuit breaker was triggered. It appears that the variable-step solver reduced its step size to its minimum configuration, causing simulation to slow down so much that it seems frozen.

After switching to a fixed-step solver “ode1 (Euler)”, I received this warning:

"This Simscape(TM) model contains both dynamic and algebraic equations even after model simplification. To improve performance and robustness for this class of model an implicit solver is recommended."

As hinted by the warning, the simulation succeeded after choosing fixed-step continuous implicit solvers such as “ode14x (extrapolation)” and “ode1be (backward euler)”.

Here is a screenshot of the finished simulation’s output:

Read more about the available fixed-step continuous implicit solvers here:

https://www.mathworks.com/help/simulink/ug/fixed-step-solvers-in-simulink.html#f11-56794:~:text=acceptable%20simulation%20time.-,Fixed%2DStep%20Continuous%20Implicit%20Solvers,-An%20implicit%20solver

I hope this helps!

[Arun Prakash]

Hello Deep.

Thank you for your effort to solve this issue. It's working when load is connected but in no load condition voltage is presented always. Here is a screenshot of the finished simulation’s output:

Is this breaker switch is working in no load condition.

[Deep]

Please try doing "Comment Through" on your load instead of "Comment Out".

The following screenshot has the load "Comment Through". In “Comment Through”, a large current flows due to the short, and then finally the circuit breaks.

Hope this helps!

[Arun Prakash]

Thank you