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15kVA 12.6kV pole pig (fwd)
---------- Forwarded message ----------
Date: Sat, 16 Jun 2007 01:57:34 -0400
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
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.
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