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Re: What is Kickback Part 2?
A pole pig is very very efficient. They are designed to operate at full
load with almost no voltage drop, ie, very good impedance type transfomers.
The "power bumping" effect you notice is the xmfr core saturating and
pulling excessive power for very short periods during the 60 Hertz cycle and
indicates you need more series reactance to limit the current. Your reactor
is doing ok early in the cycle but at peak times it allows excessive current
to flow. Increase your reactance to around 35-45 milliHenries total to
prevent this effect. Also, a 1/2 to 3/4 Ohm series resistor will help clip
these peaks and allow much smoother operation.
Dr. Resonance
-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Friday, January 07, 2000 10:00 PM
Subject: What is Kickback Part 2?
>Original Poster: Bunnykiller <bigfoo39-at-idt-dot-net>
>
>Hi all......
>
>
>Gary's question is a good one... but I suppose i have another good one
>too.
>
>
>Im running a 14.4KV pig ballasted with 3 EI core transformers with a
>single coil set on each... coil #1 pulls 5 amps at 240 V coil #2 pulls
>10 amps.. coil #3 pulls 20 amps...by switching on each in a consecutive
>manner i increase the amps draw thru the pig ( additive amps up to 35 A
>) when i kick in coil 3 there is an increase spark gap activity ( even
>when 3# is on by itself with no other inductors) the current draw
>fluctuates from 20 - 50 amps.
>
>there is also a thumping noise heard in the pole pig as the spark gap
>increases in brightness as the amp meter swings from 20 - 50 A.
>
>Dr. Res has mentioned that a resistance should be installed in line with
>this system .... but that never really gave me an explination as to why
>this anomoly is occuring.
>
>Am i seeing sometype of inductance kick back from the current limiting
>inductor to the transformer ? is there some kind of resonance going on
>here?
>
>
>I tried doing the math but i find no resonance factor that could cause
>this amperage swing... but then again theoretical and practical are
>2 different animals.
>
>
>Scot D
>
>
>