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6 Pulse Rectifier

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LAN_403

Micha0_0

Sun Sept 12 2010, 11:29PM

Registered Member #2990 Joined: Mon Jul 12 2010, 11:22AM
Location:
Posts: 40

Hey guys !

i got a 3 phase transformer which gives me about 10 kv @ 2 amp

i want to convert the 3phase ac voltage to DC voltage

i want to make it with a 6 pulse rectifier

so i thought 6 strings of 25x 1N5408 doides in series
so it could handle 25 kv at 3 amp
would be 150 diodes

could i use 6 strings of [3strings 25x 1N4007 each]--> would be 18 strings with 25x 1N4007 .
it could also handle 25KV at 3 amp
would be 450 diodes.

because the 1N4007 would be a lot cheaper than the 1N5408
and i would have the same effect.

or is it better if i use the 1N5408?

LG Micha

and

radiotech

Mon Sept 13 2010, 01:31AM

Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546

MichaO O wrote:

i got a 3 phase transformer which gives me about 10 kv @ 2 amp

i want to convert the 3phase ac voltage to DC voltage

i want to make it with a 6 pulse rectifier

What power source is the transformer connected to? Can you post a picture of the nameplate, and possibly the transformer?

This may help you desisn your rectifier: it shows 3 types of 3 phase windings connected to 6 rectifiers..

Micha0_0

Mon Sept 13 2010, 11:07AM

Registered Member #2990 Joined: Mon Jul 12 2010, 11:22AM
Location:
Posts: 40

hey...
thanks for your post

do you mean what feed my transformer?

sry it's an old transfrmer ...there's no nameplate on it

i searched on google ...and i found something...

Fzmmmfzr

Steve Conner

Mon Sept 13 2010, 11:12AM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

The 1N400x is only rated at 1 amp. You definitely want the 1N5408.

The difference in cost will vanish once you take into account the cost of your labour, rebuilding the diode strings after you blew them a few times. No doubt you'll be messing around with the transformer, pulling giant arcs from it and generally overloading it beyond its rating, so you want the strongest diodes you can easily get.

Diodes aren't supposed to be connected in parallel: they're not guaranteed to share the current equally.

Yes, that schematic above is correct for a 6 pulse rectifier.

Micha0_0

Mon Sept 13 2010, 11:24AM

Registered Member #2990 Joined: Mon Jul 12 2010, 11:22AM
Location:
Posts: 40

okey thanks...

then i'll buy the 1N5408

...another question...

will the diods get hot ?
need they to be cooled ?

i saw a pic from someone who had the same..and he put the diod strings in a plastic tube .

is that good or better when i put them under oil ?!

LG micha

radiotech

Mon Sept 13 2010, 05:12PM

Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546

do you mean what feed my transformer?

Are You going to be connecting your transformer to a three phase power source?

How did you find the 2 amp 20kV rating. Thats 69 kVa. What is the other winding voltage?

Micha0_0

Mon Sept 13 2010, 07:47PM

Registered Member #2990 Joined: Mon Jul 12 2010, 11:22AM
Location:
Posts: 40

yes it's a 3 phase power line
400V input

output is about 10kv not 20kv

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