# Current transformer saturation

I have a current transformer from this page. I tried to measure the secondary voltage Vs when I apply Vp=230 V and I change the Ip, like this:

But at some point the voltage Vs is not changing anymore (saturated?) How can I calculate this?

• I feel compelled to mention that having a CT secondary winding open-circuited, as you have shown, is a bad idea. Use the shorting links, Luke. – Li-aung Yip Jul 7 '14 at 15:46

$\dfrac{100\space\Omega}{(turns\space ratio)^2}$ = 16 micro ohms