RE: Over Saturation?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Randy & Lori" <rburney6-at-comcast-dot-net> 

George

That makes perfect sense.  (Working on the visualization here) Current
in the secondary reduces the inductive value of the transformer as a
whole, which in turn causes higher currents in the primary for the same
applied voltage?  Is this linier, or is there a point where there is a
"run away" current situation; if so is this what people refer to as
"Over Saturated"?

Randy
Savannah, GA

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Thursday, January 29, 2004 1:35 AM
To: tesla-at-pupman-dot-com
Subject: Re: Over Saturation?

Original poster: "gtyler" <gtyler-at-drummond-dot-org.za>

Flux density goes up with increased voltage, but the series resistance
of the primary means that as you increase the load on the secondary the
voltage across the actual primary decreases causing a drop in flux
density. You really need to draw the equivalent cct to see what happens,
but it takes me ages to draw circuits in emails and I have to go fight
with the taxman today!

George

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, January 29, 2004 2:15 AM
Subject: RE: Over Saturation?


  > Original poster: "Randy & Lori" <rburney6-at-comcast-dot-net>
  >
  > I knew there had to be some math in there somewhere.  So, as I
  > understand it, in most cases where I have read the term "Over
Saturate",
  > they really mean that they are bringing the core out of Saturation?
If
  > voltage is increased, then current will obviously follow, and with
  > increased current comes increased magnetism, but saturation goes
down?
  > I kept thing of "Saturation" as a term pertaining to magnetism; do I
  > have it backwards?  I really do appreciate the response, but until I
get
  > the "Visualization", the math doesn't help.  You mentioned
volt-second??
  >
  > Randy
  > Savannah, GA
  >
  > -----Original Message-----
  > From: Tesla list [mailto:tesla-at-pupman-dot-com]
  > Sent: Wednesday, January 28, 2004 10:11 AM
  > To: tesla-at-pupman-dot-com
  > Subject: Re: Over Saturation?
  >
  > Original poster: "gtyler" <gtyler-at-drummond-dot-org.za>
  >
  > Not too much of a reflection on you, any people involved in
electronic
  > design don't understand this one either! Often people ask "how much
can
  > I load it before it will will saturate?" or something similar, but
  > increasing the load actually moves a transformer further from
  > saturation. Increasing the supply voltage or reducing the frequency
  > causes saturation as it is the volt-second product that is the
critical
  > issue.
  >
  > The formula n/v =1/ 4.44BFA tells you what the flux density is.(B)
  >
  > F= frequecy
  > a= Area of the core in Metres
  > n/v = turns per volt
  >
  > George Tyler
  >
  >
  > ----- Original Message -----
  > From: "Tesla list" <tesla-at-pupman-dot-com>
  > To: <tesla-at-pupman-dot-com>
  > Sent: Wednesday, January 28, 2004 1:52 AM
  > Subject: Re: Over Saturation?
  >
  >
  >   > Original poster: "Hydrogen18" <hydrogen18-at-hydrogen18-dot-com>
  >   >
  >   > simplest way I can think of over saturation is as excess
magnetising
  > of the
  >   > core. Air cores will not saturate no matter how hard you try.
Ferrous
  > ones
  >   > do.
  >   > ----- Original Message -----
  >   > From: "Tesla list" <tesla-at-pupman-dot-com>
  >   > To: <tesla-at-pupman-dot-com>
  >   > Sent: Tuesday, January 27, 2004 8:52 AM
  >   > Subject: Over Saturation?
  >   >
  >   >
  >   >  > Original poster: "Randy & Lori" <rburney6-at-comcast-dot-net>
  >   >  >
  >   >  > Can someone explain Saturation and Over Saturation as it
pertains
  > to
  >   >  > Transformers and Inductors?  I know the term and I have a
clue,
  > but
  > how do
  >   >  > you know?  Why does my Variac (powered up) give me 0 volts
  > difference of
  >   >  > potential when an ohm meter tells me 0 ohms?  I don't need a
  > lesson
  > on how
  >   >  > my meter reads in DC, I know it's the AC but how?  I even
taught
  > Basic
  >   >  > electronics for three years in the military, but this one has
  > always
  >   > eluded me.
  >   >  >
  >   >  > Randy
  >   >  > Savannah, GA
  >   >  >
  >   >  >
  >   >
  >   >
  >   >
  >
  >
  >