0-50kV gated high voltage supply

Go to mamma search engine, just type in the words.I assure you that you will get whatever you are looking for.you can even try google.com too

bye and best of luck

Yem Abion Tim.

I am looking for designs by experienced engineer and not from a manufacturing factory. Purpose is to custom develop technology for mutual gain and future prospects. It will srve greater purpose if we all try to help engineers who know things much better and are friendly. I have 10 such small engineering teams now helping from all over the world and in coming years will like to make more contacts. I am sure there are few engineering who can take up this as hobby cum technology development interest in spare time for extra money.

If you would like to build it cheap--in your own setup with odd bits of components/gadgets/shortcuts - then let there be friends offering ideas.

If you are in a hurry and would like to get something off the shelf--you need to go to Ultravolt:

Call us: 1-800-9HV POWER (1-800-948-7693)
631-471-4444
Fax us:
631-471-4696
Write us:
UltraVolt, Inc. 1800 Ocean Ave. Frnt Ronkonkoma, NY 11779
E-mail us:
Executive: exec@ultravolt.com
Quality: qc@ultravolt.com
North American Customer Service: csd@ultravolt.com
International Customer Service: icsd@ultravolt.com
Applications Engineering: ae@ultravolt.com
Public Relations: pr@ultravolt.com
Web Site: webguy@ultravolt.com

Dear Mukul

UltraVolt does not manufacture 50kV power supply. Their power supplies can not generate fast pulse in us. Yes they do manufacture many good HV supplies up to 40kV and I have used their many parts.

What I need is HV with switching capability in microseconds from zero to 50kV or 0-60kV with programmable top voltage using 0-5V DAC output. The output may short circuit for a moment and power supply need to be protected for that. I will use it for dielectric test for increasing pulse height in 100V steps from 0V to 50kV/60kV/100kV. These are my requirements. Output current is farely small but pulse current will be high for 100ns rise time and fall time into 200pF load.

Q = 10E5x200E-12 C = 2E-4 C in 100ns or Peak current = 200A.

This can be achieved using 10000pF capacitor and gap between pulses.

Q = 10E5x200E-12 C = 2E-4 C in 100ns or Peak current = 200A.

Check up, please.

If you want to make the test of a portion of oil, reduce a gap between electrodes ten times and test voltage will decrease too.

If you want to make the test of a breakdown voltage between coils of the transformer, the capacitor value can be much more.

Krass.

Dear Krass

Yes I missed the calculation by a digit. It will peak at 2000A and that is too much. Perhaps I will slow down signal to 2us to remain at 100A peak current as best. 100ns pulse I am using only for 6kV and not 50kV devices.

I can not reduce the gap to increase the field as test need to me 1cm standard spark gap separation. More gap means less capacitance.

Thanks for pointing the error.

No, peak current is right. Mistake is in Q. Krass.

No, peak current is right. Mistake is in Q. Krass.

Hi Krass

You are right. I made the voltage at million volts and that was a factor of 10 high. Thanks for catching it. Good. I was wondering why 2000A was to come as some of my HV pulsers are working well down to 30ns ON Time for 10kV. I was shocked for a while at 2000A number. For million volts, that may be OK.

For 50kV 100A I will be very happy to switch in 100ns for 100pF pocket cell load.

Thanks.

I have now talked to UltraVolt to design 50kV and 60kV for me in high power. They will come out next year with these designs. They have a plan.

Hello Shyam,

We are not into generating the waveform you want, but we can measure them accurately WITHOUT MAKING CONTACT by measuring the electric field. Take a look at:

www.suretech.co.za Pulse Peak Sensor

NeilJ

dear NeilJ

I agree you have lots of measurement devices there. Perhaps I will like to get information on CDROM as download is very slow. Can you send it to me. You can find my address on my web link below.

Thanks Shyam,

I'll send you a data pack.

NeilJ

One of the facility of the government has 400kV DC and impulse test generator.

http://www.cat.ernet.in/technology/accel/indus/psd/psa/infrafaci.html

Actually, Seimans has a system developed for more then 20 years. I once assisted in the set-up of a liquid oxygen refinery for "AirLiquite", our main mechanical power transfer station was semi auto-mated and Seimans had power rack switches that would make the transfer open/ closure in sealed high voltage cabinats. It was insulated and arc protected, it had a screw survo device, that could either be electrical or pnuematicly controlled. I was amazed at how systems had been improved over the years, especially in the high voltage power transmission.

Good luck.

Dear Maximo

I am building product for online testing of the transformer oil quality and hence this device is a arther small pack of avout 300mmx300mmx300mm. It is connected with transformer oil tank with oil-in and oil-out tubes to sample the oil.

I do not have complete details of the transformer oils and their breakdown voltages and perhaps to look into what is used in India and other countries. This is also to be done to check the quality of transformer oil loaded at the first place and what happens over period of time to it.

I am yet to decide on the sampling and analyzing rate.

Shyam, Do you need to actually measure the breakdown voltage of the oil or could the oil sample be analysed for signs of dielectric weakness?

A sample could br placed inbetween two known diameter and known separation electrode plates and say 500 Volts applied and the insulation resistance noted... maybe in the Tera ohms range?

I have an instrument for this, fairly old but very accurate, it can read up to 20 TeraOhms with switchable test voltage of 50, 100, 200, 250 and 500 Volts dc.

Maybe another method could be to measure the dielectric properties of this sample, at rf frequencies?

I'm sure that there must be some indicator that stands out as the difference between known good oil and oil which is decidedly getting close to being replaced...

John.

Dear John

I have worked with some of these oils earlier in one of the experiment where I wanted to apply 300kV at just 5mm thick LiF flouride crystal. I filled the cavity by transformer oil to avoid air discharge. When I applied the voltage, then even below 100kV it used to have micro discharge spark and it henerated UV, which was recorded in the crystal. This is not what I wanted to do. I am afraid that small air bubbles are dangerous for small gaps and their effect may not be so mych for say 10mm gap which itself I am worried.

My aim is to detect real breakdown voltage with 100kHz frequency and not very high frequency signal. I will try somewhat filtered 100kHz signal after I switch through fasts switch in about 2us to 5us. I have those HV switches now for 100A in 200ns.

Your idea of testing the impedance is OK. I will try that too. I will try 4W pow power HV supply in that case and if it sparks then there will be only 100uA peak current.

Dear John

One company Crompton Greaves ltd. very near (18 km) to my place has 2.6 million volt impulse tester for their transformer oil testing. Impulse Generator is 2.6 Million Volts - Emil Haefely.