100kv 10ma / High Voltage / Forums

Forums

4hv.org :: Forums :: High Voltage

« Previous topic | Next topic »

100kv 10ma

previous 1 2 3 4 next

Move Thread

LAN_403

Microwatt

Fri Jan 21 2011, 12:57AM

Registered Member #3282 Joined: Wed Oct 06 2010, 05:01PM
Location:
Posts: 224

how far can you overdrive a NST before the insulation fails. can you put in 480 single phase?

Zack

Fri Jan 21 2011, 03:48AM

Registered Member #3624 Joined: Mon Jan 17 2011, 01:08AM
Location:
Posts: 25

480 will burn out any normal mains powered nst very quickly. You might want to use a high frequency 5kv nst to a large 20 stage multiplier. How much are you willing to spend on this?

Adam Munich

Fri Jan 21 2011, 04:02AM

Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242

With 20 stages at 60Hz the output would drop ridiculously under load.

You still haven't told us what you plan on doing with this. Does it really need to be 100kV? An x-ray transformer can supply the juice for short runs, and atlasfronteirs sells x-ray heads for about 90 dollars. Albeit it'll cost 50 to mail but it's still going to cost a lot less than a huge multiplier. A full wave 100kV rectifier made out of hundreds of 1N4007s could turn it DC with only a couple hundred volts drop, and a couple homemade rolled caps made of 40 layers of transparency sheet each (2x20) could provide some smoothing. Put everything under oil or it'll all die in short order.

Dr. ISOTOP

Fri Jan 21 2011, 06:06AM

Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652

What about a high-frequency transformer (like Steve Ward's CCPS) driving a multiplier? The required stage capacitance will decrease because of the high frequency. 20 kV RMS feeding a 2-stage multiplier should get you peak voltages of 20*1.414*4=110 kV.
You only want 100 kV, so you are allowed a 10 kV drop - this lets your stages be as small as 140 pF.

Robert2

Fri Jan 21 2011, 09:33AM

Registered Member #1773 Joined: Tue Oct 21 2008, 06:56PM
Location: Poland
Posts: 93

Hi EastVoltResearch

Thank you for Profi approach to the topic.
Firstly, I do not use English every day so it's difficult for me to feel as any to write.
I hope that what he writes is quite understandable.
That's right my converter does not work on CW. Writing 1.5kW 10mA and I was thinking of 100 KVA power input brought to the half-bridge inverter and transformer X-ray.
It is my X-ray transformer, 500W power loss because it gave me a thought.

I am not a professional electrician high voltage just an ordinary man:) learners of electronics at a technical college.

Resistor 0.5Ohm actually heats up very quickly, and now even broke down
Do I say that the current is 50 mA is only 10 mA once and these two figures are just estimates. I do not have adequate instruments to check the actual output current.
also think that in most current and output voltage in amateur construction is only an estimate. In fact, when it charges the same X-ray transformer with 60W light bulb lights up at 10 kV. If a 60W light bulb light up when the 230 is a current will flow which is 0.26. 0.26AX 10kV output voltage converter / transformer X-ray output is 2.6KW. One must take into account that it is still a resistor between the inverter and the power multiplier of 2.2 K ohms. zanzaczyÄ‡ must also be that after the load converter will certainly drop in voltage to 5kV, say what would have meant a decline by about half that is 1.3KW Hence, there are discrepancies. I need to build a voltage divider and buy wychyÅ‚owy ammeter or voltmeter, and thoroughly everything again measured and documented. Why can I create here on in, and everything I will be holding a whole, and that you can me in the right direction to direct measurements.

We, the Polish forums for everyone to catch all the words and list the details wrong, and to help moÅ¼nal only count on good friends.In one word there is an unpleasant atmosphere, everyone catches the mistake is not knowing how to correct it or not knowing how much less.

Often, these forums look through and I feel that I can count on the Profi-help and a friendly atmosphere.

Thank you for everything so far, may soon be an appeal

Bored Chemist

Fri Jan 21 2011, 01:09PM

Registered Member #193 Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022

Is it just me who thought that the answer to "How can i make this power and voltage in DC?" is probably "Fatally"?

Proud Mary

Fri Jan 21 2011, 03:45PM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

I wonder how much a single metre of Okonite 100kV cable costs? And the IEC 60526 100kV plugs and sockets?

Gasp!

Torchwood

Sun Jan 23 2011, 12:24PM

Registered Member #2668 Joined: Sun Jan 31 2010, 12:11PM
Location: South Australia
Posts: 18

I have an x-ray transformer that can output 125Kv at 100mA for 10 second bursts that is the size of a small microwave oven, it is in an aluminium box filled with oil, I also have the leads that connect it to the x-ray head, it came out of an old 'C' arm x-ray machine that is used in operating theaters for live x-rays during surgery.

That is 12.5KW output, no idea of the efficiency but I don't have the means to supply 1 quarter of that from any of my house outlets let alone the energy needed to run at full output.

One of these days I will have to get around to selling it.

I also have the x-ray camera that the x-ray head is aimed at.

Microwatt

Sun Jan 23 2011, 05:30PM

Registered Member #3282 Joined: Wed Oct 06 2010, 05:01PM
Location:
Posts: 224

I am willing to spend atleast 2000 on this project. however, the converter circuit must be robust and not subject to transients. and run on 120vac.

I have been tossing around the idea of a dual flyback transformer. each putting out 25kv and running that through a matched CW to create 100kv.

Dr. ISOTOP

Sun Jan 23 2011, 07:30PM

Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652

Once again, if you told us the exact application of this supply we could better help you.

previous 1 2 3 4 next

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