WTB: High Voltage 60Hz Transformer / Sale and Trade / Forums

Forums

4hv.org :: Forums :: Sale and Trade

« Previous topic | Next topic »

WTB: High Voltage 60Hz Transformer

1 2 3 next

Move Thread

LAN_403

Firefox

Thu Aug 14 2008, 04:08AM

Registered Member #1389 Joined: Thu Mar 13 2008, 12:50AM
Location: Pittsburgh, PA
Posts: 346

I am looking for a high voltage low current 60Hz transformer for use in some experiments with very high voltage multipliers. Preferable ratings would be 70kV 5-20 mA RMS, but it would be great if the voltage was 125kV RMS+. I don't have any clue as to how much a transformer like this will cost, so I may not actually be able to buy the transformer at the moment, with paying for 4 more years of ejamuh-cation and all.

Myke

Thu Aug 14 2008, 04:48AM

Registered Member #540 Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969

x-ray transformers come to mind. They are pretty expensive off ebay imo and also shipping is expensive too. You also need to run them under oil otherwise they will die at full voltage. You might find one in a junkyard though. You never know.

Dr. SSTC

Thu Aug 14 2008, 09:20AM

Registered Member #1407 Joined: Fri Mar 21 2008, 07:09AM
Location:
Posts: 222

ye x ray transformers are your best hope although you could get your hands on a varey large ferrite U core and wind a secondary yourself and run of mains powerd full bridge driver.

Firefox

Thu Aug 14 2008, 06:28PM

Registered Member #1389 Joined: Thu Mar 13 2008, 12:50AM
Location: Pittsburgh, PA
Posts: 346

I had thought about getting a huge UU core, like the ones Steve Ward and Finn Hammer used in their SLR CCPS's, but I have a feeling that the bobbins, wire, insulating film, and cores would be cost prohibitive. If its not, I have enough time to make small progress on a project like that daily, but I also think it would be better to start with something that won't blow up in my face after 15 minutes of use, a given if I treat a factory made transformer well.
The x-ray transformer sounds like a good idea, I'll keep an eye out on ebay for a reasonably priced one, and check around the local junkyard.

Marko

Thu Aug 14 2008, 07:29PM

Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145

If you are going switched mode, I can't thing of anything better to produce 125kV 20mA than a big SSTC. Designing a 100kV ferrite transformer would be hard, unless you are going to invest into some CW multipliers too.

Ofcourse anything like this demands great deal of work and time, which might not be worth buying an iron transformer.

There are always Xray transformers tossing around ebay, and usually easily available for US.

Firefox

Thu Aug 14 2008, 08:40PM

Registered Member #1389 Joined: Thu Mar 13 2008, 12:50AM
Location: Pittsburgh, PA
Posts: 346

Yeah, I have the high bid on the $20 one right now, but I have a feeling its going to jump out of my price range pretty quickly on the last day, unless the guy bidding against me is kind enough to let me have it

.

Also, I intend to use this transformer with CW multipliers, starting with 100kV peak. I have the materials to build my own HV capacitors, and I will be investing in some 1N4007s soon as well. I found it incredible that I could make a 200kV PIV string for $2.50. I know I will also need to get some 100kohm resistors for a limiter too.

Dr. SSTC

Fri Aug 15 2008, 07:08AM

Registered Member #1407 Joined: Fri Mar 21 2008, 07:09AM
Location:
Posts: 222

ye getting a x-ray transformer is the easy thing

i always like to chalange myself and would probably build it myself, i have build a 120kv supply but low current only a milliamp or two

Hazmatt_(The Underdog)

Fri Aug 15 2008, 09:09AM

Registered Member #135 Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735

Just buy it. I've wound transformers before and if you're not careful about your wire selection and insulators, its not going to give you what you thought it would. Add to that the extreme requirements of this kind of transformer where its secondary inductance is enormous, wire gauge is extremely thin, and horrendous peak voltages, a home made trany like this may end up with so much internal losses that it shorts the instant you want to pull current.

It's definately worth purchasing.

Firefox

Fri Aug 15 2008, 02:02PM

Registered Member #1389 Joined: Thu Mar 13 2008, 12:50AM
Location: Pittsburgh, PA
Posts: 346

Thanks, Hazmatt. I'll keep that in mind.

Firefox

Sat Aug 16 2008, 01:56AM

Registered Member #1389 Joined: Thu Mar 13 2008, 12:50AM
Location: Pittsburgh, PA
Posts: 346

Well, I just got way outbid on the x-ray transformer. Anyone else have one to offer, or a good place for me to look over here, around Pittsburgh. My dad tells me most of the junkyards around here only deal with cars, so I don't know where to begin to look.

1 2 3 next

Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob