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RE: 50 KVA Power Supply




How big of an arc do you get with the pigs at 280 volts.
Barry

 ----------
|From: "tesla-at-poodle.pupman-dot-com"-at-PMDF-at-PAXMB1
|To: Benson Barry; "Tesla-list-subscribers-at-poodle.pupman-dot-com"-at-PMDF-at-PAXMB1
|Subject: 50 KVA Power Supply
|Date: Friday, September 27, 1996 3:21AM
|
|<<File Attachment: 00000000.TXT>>
|From richard.quick-at-slug-dot-orgTue Sep 24 22:33:52 1996
|Date: Wed, 25 Sep 1996 01:34:00 GMT
|From: Richard Quick <richard.quick-at-slug-dot-org>
|To: tesla-at-poodle.pupman-dot-com
|Subject: 50 KVA Power Supply
|
|I wrote:
|
| > I picked up the new pig today, I will have to get it wired and
| > fired to find out if things are different/better now.
|
|Jim said:
|
|> I look forward to your results.
|
|Well, we will see how it goes. My brother and I wrestled the new
|pig (can you say "rodeo") out of his truck and up onto the engine
|cart next to it's mate. After grounding both cans with some strap
|and using some No. 4 AWG cable to parallel both LV windings, I
|connected the two pigs to the power cabinet and began some low
|power testing.
|
|With every bit of ballast I could muster, I ran the variacs up to
|100 volts and heard a slight hum from the pigs. Not a good sign.
|After turning the power off I rolled the cart around so I could
|approach the HV bushings and placed an insulated platform on the
|floor. Going back to the cabinet I powered the LV windings up to
|100 volts. With the primaries live I stood on the platform with a
|length of HV insulated wire in my hands. I approached the HV
|bushings one at a time with one end of the bared conductor. A
|slight crackle assured me of standing HV on the bushings, but
|carefully bridging both HV bushings failed to produce an arc.
|I was out of phase.
|
|After reversing the phasing on the LV windings I opened the
|variacs back up to 100 volts and the humming was gone. Bridging
|the HV bushings with the HV wire (while standing on the insulated
|platform) resulted in a nice 60 cycle arc about six inches long
|and as thick as a pencil. Pulling the arc upwards from the
|terminal I could sustain a six inch arc indefinitely.
|
|Running the pair up to 280 volts input resulted in only the
|slightest hum. Gone is the growl of the stressed and saturated
|7200 volt pig ramped up to 14,400 volts by doubling up the
|primary and running 240 volts into the 120 volt windings.
|
|Alas, along with the new pig, a clothes washer also arrived in my
|brother's truck. Until I get the washer moved out of the garage
|and into the basement, I don't have room to fire up a coil. Give
|me a couple of more days. However, so far so good.
|
|Richard Quick
|
|
|... If all else fails... Throw another megavolt across it!
|___ Blue Wave/QWK v2.12
|