Mains transformer goodness

The sharpness of the saturation knee is NOT a function of AC primary voltage.

...... Phil

Gee, i did not find them unreadble.

No thanks, i already did that work twice for my cow-orkers. It was not worth it, they did not learn a darn thing. Twice burned by others whose job was to keep up with this stuff. .

It's a function of working flux density. A transformer designed for low radiated field might be operating at a much lower working flux than a standard commercial type, hence it would take much more magnetising force i.e. primary volts before saturation. Simple physics.

Graham

Tell me about it !

Graham

Actually there are two considerations here that may prove Phil to be correct in his assertion. The first is that the transformer I tested was a custom wound unit which was essentially just a primary winding with the secondary to be bus bars through the center hole, and it had been wound for a particular output voltage on a specific size core, so it had more turns than were optimal. Before management abandoned the project (and essentially scrapped about 20 toroids), I removed about 20% of the primary turns and increased the output voltage.

The second consideration is that I performed my measurements by using a variable AC source and a transformer of perhaps 250 VA with a 480 VAC secondary. So, as the voltage approached saturation, and current increased, the waveform probably became distorted, which allowed a slightly higher RMS value to be applied with less current than might have been drawn with a better waveform.

But the values I posted were from my actual notes, and not from memory.

Paul

The saturation knee curve shape is a property of the magnetic strip.

As usual - you have snipped and ignored the context.

.... Phil

My

other

carefully

make by

In 'mericanese "I hear you bro" is more appropo. .