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Good Pig
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From: Wysock, William C. [SMTP:Wysock-at-courier8.aero-dot-org]
Sent: Wednesday, February 04, 1998 1:53 PM
To: Tesla List
Cc: ttr
Subject: RE: Good Pig
Dear Greg,
Depending on the Kva rating of your transformer, the readings
look about right. Since your ohm meter is D.C., when you place
the probes across the H.V. winding, you are slowly magnitizing
the core, hence the slowly settling reading of 350 ohms. The low
voltage winding is designed for much higher current, hence what
appears to be a dead short (remember, it's A.C. impedance, not
D.C. ohms that really tells the story here.) You could take say, a
500 watt light bulb, or electric heater or some sort of resistive
load and place it in series with the low voltage winding, and apply
your full mains voltage. Take a couple of metal coat hangers
or stiff solid copper wire, and fashion a Jacob's ladder, across
the H-V terminals, where the bottom gap is say, not more then
0.10" and the top is about 3-4". You should see a nice traveling
arc. Also, if there is a removable top access cover, you might
check inside, to see if there is a voltage selection tap change
switch. Normally (at least here in the U.S.,) tap position # 1 is
for the highest voltage rating on the H-V side of the transformer.
I just hate it when everyone out there in List land calls them
"pigs" or "trannies." But then, that's just my personal bias.
Hope this helps.
Bill Wysock
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Tesla Technology Research
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From: Tesla List
To: Tesla List
Subject: Good Pig
Date: Wednesday, February 04, 1998 10:47AM
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From: Gregory R. Hunter [SMTP:ghunter-at-mail.enterprise-dot-net]
Sent: Tuesday, February 03, 1998 4:03 PM
To: Tesla List
Subject: Good Pig
Coiler Types,
I've been tinkering with my new pig, trying to ascertain if it's
serviceable or not. I'm too chicken to apply mains power to it--I
don't have anything to ballast it with. I ohmed the 11KV winding,
and the needle (honest, a moving needle) slowly settled down on
about 350 ohms. The 240V winding was practically a dead short. I
have no idea what the resistance of pig windings should be. Do my
readings sound right?
I was desperate to test it somehow, so I tried my 6 amp car battery
charger on it. I made a spark gap of about .25" with some stiff
wire. I clipped one charger lead to one 240V terminal. I tapped
the other charger clip against the other 240V terminal, and
was rewarded with a sharp "SNAP" across the spark gap. I think it
works! Not bad, considering the price tag (it was FREE).
Greg
Tickling the Pig's Tail in East Anglia, UK