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High Voltage Withstand Tester AC/DC

I have a brief to design and build a HV test truck with the following specs:

AC 75kv @100mA, 35kV@400mA DC 40kV@400mA, (-20kV)-0-(+20kV) @ 400mA also 300vac @ 30 amps for induced testing of 415/11kV transformers variable (from the regulator) my head is spinning at the possibities. I think that it'd be elegant to use 1 transformer with 2 secondaries. i could utilise the fact that both 240v and 415v @ 63amperes are available for the source supply. I am considering utilising a doubler circuit for the split supply DC supply as well as for the single ended DC supply by just moving the earth point. Mind you for the 75KVac I'd need to get a high volts transformer anyway so maybe a full wave rectified with centre tap?. 1 of the problems that I'm having is calculating the primary VA's for secondary VA's for various rectifier (& doubler) circuit dc outputs. It seems that there are cost benifits/penalties if there is a dc flux component thus needing more core iron to avoid saturation (but how much??) and likewise if both ends of the winding need to be insulated for HV rather than just one(also...how much??). I'd sure appreciate a bit of wisdom on how to approach this.

many thx in advance

Danny

Reply to
Danny
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This is a professional design problem that has been addressed many times by real engineers. If you have to come here fore advice you are way way way out of your depth

GET professional advice before you kill someone , maybe yourself.

This is a professional design problem that has been addressed many times by real engineers. If you have to come here for advice you are way way way out of your depth.

GET professional advice before you kill someone , maybe yourself.

News groups are really for asking isolated questions that someone with other experience may be able to help with.

They are not for teaching engineers?? how to do their job.

We can never know the circumstances and any answers could easily kill YOU.

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John G

Wot\'s Your Real Problem?
Reply to
John G

er.... I'm not quite sure what to make of this answer....as far as being a 'real engineer'...i think i qualify...both by education, qualification and experience. i have in fact been able to give quite a lot of help on this group over about 7 years. and, yes i am well aware of the dangers involved. i work for a big electric utility company and we have very strict rules regarding safety AND a lot of experience in HV testing. yes, i could simulate every possible configuration...although with the nonlinearity of transformers it's not trivial by any means. yes, i could do a cost/space/weight saving exercise which would also be quite complex.....i could do a lot of things actually....and whilst i am busy doing them (which i am) i just thought someone out there might offer some advice based on the fact that they might have gone through this process before. isn't that the point of news groups. and as for 'Wot's Your Real Problem?'.....what do you mean exactly?.......and as far as the: 'This is a professional design problem that has been addressed many times by real engineers.' well, there is scant literature regarding this topic. true the rectification circuits are well known but the associated TUF's are not readily calculated when in use with a reservoir capacitor. Terman quotes TUF's for rectifiers without reservoir capacitors. i will be able to work them out myself although it's not straight forward. i'd like to think that after being a member of thes NG for some time now, both getting help and offering help that i wouldn't get lectures on being a 'Real Engineer'.

many thx

Danny

Reply to
Danny

and then promptly achieved what you didn't want to do....

yes i am well aware of phenix....we have bought a lot of gear from them over the years as with heafly, hi-voltage, hipotronics, bicotest etc etc.

for various reasons i want to build this one inhouse.

we can, and we do.

for the specialists

we've designed this particular test truck in-house before over the years....and i'd like to do it again. specialist help is always gratefully accepted. unfortunately no specialists on this group have offered any yet. doesn't matter, as a 'real engineer' (i think) i'll slog through the maths, get whatever expertise that i can get from long term members of the section and continue.

very much.

I have read and contributed to this NG quite a lot since about 1995 as with alt.eng.electrical

forums before BBSs or the Internet were born.

a 'tag line'...... 'corporate forums'.......oh I see now....the light is shining in....extremely impressive. thanks for putting me right.

Reply to
Danny

Danny, I don't want to upset anyone ,but often people come here with the most ill defined problem and no evidence that what anyone says will be used wisely.

Your problem is A. dangerous and B. quite extensive.

Yes, you may get some useful pointers here but surely a problem of this nature is something that requires a team of experienced engineers who have done it before and made all the mistakes.

There are numerous companies, for instance

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,who do this kind of thing all the time and don't need to have their head spinning with possibilities (your words).

You will not be able to afford the equipment to calibrate your work so you will get a more reliable outcome if you just accept that it is a job for the specialists.

If you do not understand the sentence then ? If you don't understand the implication then sorry.

And if you take it so seriously, you have not read this or other electrical NGs very much. I have been using that for a tag line since about 1985, yes in corporate forums before BBSs or the Internet were born.

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John G

Wot\'s Your Real Problem?
Reply to
John G

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