Mr.Erik it's not about money alone ,it's time.

I have just placed orders for some ferrite beads,it's going to take at least 2 weeks to get it,that's so much time ,My panels are to be dispatched in a weeks time..

Since the project has been roasting for some time it's my fault I didn't arrange the material before.

I am still wanting to make it so atleast before comissioning the system can be installed.

People on the forum asking why do I want to turn OFF at zero current crossing.

Zero voltage is good enough for small inductiv loads like a coil of a contactor taking around 130 mA,but not for direct capacitor switching.

The current and voltage are out of phase in most industrial applications,especially in case of large motor installations.
Now when I turn of a thyristor when voltage is crossing zero,but current may be near the peak values,this does effect reliable commutation,thats what I have understood as the reason for using ZCS switching.
Also


EPCOS

Initially when the system is turned on you switch ON using voltage crossing but during turn off & subsequent switching you turn off at current crossing.

Note that the thyristors dv/dt should be large enough to avoid any trigger since when current is near zero voltage is ramping up to a higher amplitude.

If you see most new TCS( thyristorised capacitor switch) use ZCS (zero current cross ), hence I need to know how could I detect a current cross.

Should I convert current to voltage and then use same method as a zero voltage cross?or there is any other professional way ?


Can you please share your opinion on this?

Thank you

With regards
Deepak