mike wrote:



http://sound.westhost.com/articles/inrush.htm


** FYI:

I had a large input to the writing of that article - Rod is a friend and colleague, we talk and email regularly.

The most surprising thing is how the in-rush surge of an unloaded transformer consists of brief pulses all with the same polarity - it's DC current.

Why is that surprising?


** Most people are *very* surprised to find this out.

Just like YOU were surprised that zero switching produces maximum surges in transformers.

It's counter intuitive in both cases.



..... Phil