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# RE: Using MicroSim

```Well, Daniel... Maybe I can help here a little bit...

>>I'm not sure I know what all of these
parts are. Can someone explain to me what a MOV is and what it does?

MOV stands for metal oxide varistor.. This device is used to limit the
inrush of current that allows large voltage spikes to form. (To an extent)
the extra energy that is accumulated in this device is wasted in the form of
heat.

>>I noticed that the sine wave of the starting AC voltage is exactly
opposite of the wave coming out of the transformer, can anyone explain this
to me?

On transformers, there are usually 2 dots. These dots mark the way the
secondary is coupled to the primary. Meaning which way the secondary is
wound in relation to  the primary. Keep that in mind.  These dots are used
when measuring the transformer. When an EMF(ElectroMotive Force ie. Voltage)
is applied to one side of the coil(dot), this makes one lead of the coil
more positive than the other.   At the very same instance, on the secondary
(with respect to the dot) through magnetic coupling an equal but
opposite(for all practical purposes of discussion) reaction occurs. Meaning
that the dot pin is more negative than the other pin in the secondary
winding. This means that the output is 180 degrees out of phase with the
input (Voltage and current).  That is what you have been seeing visually.
You can try this experiment with an old stepdown transformer from a power
supply. With a 2 channel scope, place 1 channel on the dot side of the
primary, and the other on the dot side of the secondary, and you will see
this visually represented.

I hope this helps a little.

Albert

-----Original Message-----
From: Tesla List [mailto:tesla-at-pupman-dot-com]
Sent: Tuesday, August 03, 1999 9:09 PM
To: tesla-at-pupman-dot-com
Subject: Using MicroSim

Original Poster: Erthwin-at-aol-dot-com

I just spent the last hour or so playing around with Terry's MicroSim files
(thanks for directing me to those Terry) and I think I've learned a lot. I
also have a lot of questions about what I've been seeing. First off I
thought
it was brilliant how the various components were put together to simulate
what a real coil would do, however I'm not sure I know what all of these
parts are. Can someone explain to me what a MOV is and what it does? Also by
plotting several of the probe things next to eachother I noticed that the
sine wave of the starting AC voltage is exactly opposite of the wave coming
out of the transformer, can anyone explain this to me? I'm not sure I
understand how the primary coil of the TC was simulated in these schematics
either, I see that the secondary coil was simulated with capacitors and
resistors (with values no doubt obtained through wintesla or something
similar) but I don't understand how the primary coil fits in, how are things
like turn spacing and wire width taken into account? Perhaps these are
prefigured and then the values plugged in with parts that can approximate a
primary, if so which parts should I be looking for? And how would I put a
probe onto the primary and one on the secondary to compare these waves? I
assume they would be the same but I'd like to see it anyway out of
curiosity.
Any other suggestions as to what I should try messing with next in these
programs would be appreciated, I think MicroSim deffinately has potential
but
it'll probably take me awhile to find it all, until then I'm off to go play
with it some more :)

Left, left, I hadda good brain but it left...
---Daniel

```