Jim, Mike too, Halden and all

I hope most previous posts go into “quoted text” on line, but the bottom of emails will have redundant copies.. for good or bad.

My stuff in green, the original still in black

Mike, perhaps I have a problem reading your words, but I still can’t digest your post, the only thing I can say is that yes the R should help to dampen any transient ringing.

Jim, I was just going to bypass this, but I have problems in places.

If you are saying that a pure reactance has a 90 degree phase difference between E&I and that any resistance will reduce this angle, then I agree.? The higher the resistance when compared to reactance, the more this effect.? In power transformers, the resistance is very small compared to reactance so it's effect is also small but it is still there, none the less.? Ok?

This idea of a surge in an inductor is just plain physics. Ok, but some is not so “plain”, and don’t forget anything.? The closer to the zero voltage crossover point, the higher the current surge Ok often but. since they are separated by 90 degrees. That does not read well to me. To come up with the answer, you have to take the integral of the voltage over time, which is most easily seen as the area under the curve, and this first excursion can be well over 90 degrees, depending on how you measure degrees when things go non-linear as can be seen in Halden’s images, and what you seem to be trying to say applies only if the core begins with no magnetism, as most simple analyses assume. The worst case is when the in addition to the zero voltage crossover, the magnetic pole of the laminations has to be reversed. Perhaps words get in the way of my understanding of this, but there will be little saturation if the magnetism has been “negative”, and is now driven “positive”, but it will saturate quickly if it is “positive” is driven more “positive”, etc. I am thankful for Halden’s tests which seem to show much of this, however after any switch “off” is complete to current zero the flux left in the core seems to be a hard thing to calculate, but these days you can put a hall probe in the core if you really want to know, this aiming too far off topic.?

It is evidently easier to picture the surge in a filter capacitor then in an inductor. Maybe, but it is far to general for me to make a comparison.? The only reason for the concern in a filter capacitor was the inability of a vacuum tube rectifier to handle a high surge current without damage.?I can’t see any connection to the topic Solid state rectifiers have eliminated this concern since they have the ability to support a 30 amp or more initial surge current. I can’t see any connection to the original topic, but when a topic for HT-37 modifications comes up it would be relevant.

As to the rest of the words, I don’t understand them, and I don’t understand why they are here.

Most of us believe that a current is the movement of electrons.? Maxwell (and thanks to Heaviside) has a different opinion.? What actually happens is mind bending.? Electrons move too slow to carry a current but the charge on the surface of the wire does travel at the speed of light.? See:

This is a basic tutorial on Maxwell without the math which I would not understand either!? Instead of solving Maxwell's equations for every circuit, we can use a lumped element model which we call Ohm's Law.

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So the magnetization in the inductor happens at the speed of light just as the charge does on the surface of the wire.? Like I said, mind blowing!

Regards,

Jim

Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy

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On Sunday, August 11, 2024 at 08:54:30 AM CDT, Mike Feher <n4fs@...> wrote: ??