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Re: 15kVA 12.6kV pole pig (fwd)
---------- Forwarded message ----------
Date: Sun, 17 Jun 2007 00:13:01 +0000
From: David Rieben <drieben@xxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Cc: drieben@xxxxxxxxxxx
Subject: Re: 15kVA 12.6kV pole pig (fwd)
Tim,
Then the only thing that I can suggest is the advice that Bert Hickman
gave about the ferro-resonance issue.
David Rieben
-------------- Original message --------------
From: "Tesla list" <tesla@xxxxxxxxxx>
>
> ---------- 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,
>
>
>
> Â Â Â Â already disconnected it.
>
>
> -----Original Message-----
> From: Tesla list
> 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
> o: Tesla list
> 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"
> >
> ---------- 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,
>
>
> Â Â 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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