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Re: 15kVA 12.6kV pole pig (fwd)
---------- Forwarded message ----------
Date: Sat, 16 Jun 2007 15:48:52 -0400
From: timjroche@xxxxxxx
To: tesla@xxxxxxxxxx
Subject: Re: 15kVA 12.6kV pole pig (fwd)
David,
already disconnected it.
-----Original Message-----
From: Tesla list <tesla@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Sent: Sat, 16 Jun 2007 8:32 am
Subject: Re: 15kVA 12.6kV pole pig (fwd)
--------- Forwarded message ----------
ate: Sat, 16 Jun 2007 15:27:30 +0000
rom: David Rieben <drieben@xxxxxxxxxxx>
o: Tesla list <tesla@xxxxxxxxxx>
c: drieben@xxxxxxxxxxx
ubject: Re: 15kVA 12.6kV pole pig (fwd)
Tim,
Ok, wow, that is rather strange. Logic would dictate that your transformer
ould react the opposite to what you are describing -- a loud core satura-
ion hum when attaching 240 volts to the center LV and one of the outer
nes (that is the 120 volt tap) and better perfromance when attaching 240
olts to the outer two LV terminals (that would be the 240 volt tap). O yea,
almost forgot to ask you about this issue. Is there a copper ground strap
etween the center LV terminal and the case of the outer tank? Most single
hase pole trannies do come with one of these grounding straps and if it
s there, you will need to remove it and leave this terminal unconnected
floating" for Tesla coil use. That may explain why you are getting saturation
hen running 240 volts through the 240 volt winding - it's being shunted out
o ground half way through the LV winding.
BTW, that transformer sounds like a nice catch ;^))
David Rieben
-------------- Original message --------------
rom: "Tesla list" <tesla@xxxxxxxxxx>
>
---------- Forwarded message ----------
Date: Sat, 16 Jun 2007 10:28:24 -0400
From: timjroche@xxxxxxx
To: tesla@xxxxxxxxxx
Subject: Re: 15kVA 12.6kV pole pig (fwd)
david,
  yes, i am sorry, it is Tim, thank you. according to the factory
nameplate, it is a 120/240 LV. FYI -Â HV has a 5 position switch for
incramental voltages from 12,600 down to 10,500 VAC.
-----Original Message-----
From: Tesla list
To: tesla@xxxxxxxxxx
Sent: Sat, 16 Jun 2007 6:40 am
Subject: Re: 15kVA 12.6kV pole pig (fwd)
--------- Forwarded message ----------
ate: Sat, 16 Jun 2007 14:08:31 +0000
rom: David Rieben
o: Tesla list
c: drieben@xxxxxxxxxxx
ubject: Re: 15kVA 12.6kV pole pig (fwd)
Hi , is it Tim?
Are you sure that your newly aquired pole transformer isn't rated for 240/
80 on its low voltage terminals instead of 120/240 since you are getting
etter performance by center tapping the LV terminals?
avid Rieben
-------------- Original message --------------
rom: "Tesla list"
>
---------- Forwarded message ----------
Date: Sat, 16 Jun 2007 01:57:34 -0400
From: timjroche@xxxxxxx
To: tesla@xxxxxxxxxx
Subject: 15kVA 12.6kV pole pig
i have recently went from two Westinghouse PT's (about 5kVA) to a 15kVA
pole XFR. Holy Squirrelly!! i am running SRSG 3600 RPM 4flying (.5"
tung.)/2 station (.5" german silver). 0.1 uf hipotronics 70kV RMS tank
cap.
my biggest issue, besides the obvious current limiting, is getting the gap
to quench. went to 8 pole flying and basically made a jacobs ladder around
the rotor. like no quench at all. so back to 4 flying. am i way off or is
this a impedance problem on the LV side of pole XFR? BTW - i get nothing
but 60 cycle hum or saturation using 220 VAC RMS across the LV windings.
yet if i hook up my 220 VAC RMS with one leg on the CT or hooking it up
like 110 VAC RMS, i get much better performance. for those interested, i
was using a 1256 variac as voltage control and a 1156D as phase ajustment.
Now i have put a 3-stack 60 amp inline current limit. i first put 220
across it and turned the wipers till i was pulling 40 amp. then put it in
series. it is still only a 3 to 4 foot streamer. with my PT's, i can get 2
-3 streamers 6 to 7 foot long.
Thoughts?
Suggestings?
Ideas?
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