Paralleling transformer secondaries.

commstech · 27th November 2004, 03:45 PM

If i have a trans that has a pair secondary outputs 30V and the trans is rated 225VA. Assuming my requirement is only one of the 30V secondary; can i simply parallel the two secondaries and achieve better VA rating? Ok, if it does not improve VA, any harm will come of it?

Anyone plse advise. Thanks.

AndrewT · 27th November 2004, 03:58 PM

Hi,
carefully check that you find the 0v & 30v ends of both windings before you connect them.
If you connect the 0v to the other 30v then you end up with 60v into a short circuit.
I suggest you connect them in series first & check you have 60v into open circuit.
Get it right & you have twice the current capacity at the same voltage i.e. 30v 7.5a
Q how do you check series primaries are correct before you connect the mains?
regards Andrew T.

commstech · 27th November 2004, 04:05 PM

Quote:

Originally posted by AndrewT
Hi,
carefully check that you find the 0v & 30v ends of both windings before you connect them.
If you connect the 0v to the other 30v then you end up with 60v into a short circuit.
I suggest you connect them in series first & check you have 60v into open circuit.
Get it right & you have twice the current capacity at the same voltage i.e. 30v 7.5a
Q how do you check series primaries are correct before you connect the mains?
regards Andrew T.

Hi, the winding diagram is given and wire leads are color coded, should have no problem. i have connected up in series and yes, the 60v is there.
ok, how do i connect them ?

Pair 1
-------
30V - red
0V- black

Pair 2
-------
30V - Orange
0V - Yellow

I would think RED to Orange and Black to Yellow. Am i correct?

Gaucho · 27th November 2004, 05:01 PM

Quote:

I would think RED to Orange and Black to Yellow. Am i correct?

It would certainly seem so. To be on the safe side hook-up just the red and the orange at first and then check to see that that there isn't any significant voltage between the black and yellow leads.

AndrewT · 28th November 2004, 06:53 AM

Hi,
if red/yellow gave 60v when blk/orange connected then common red & orange and common blk & yellow.
Unusual colours for secondaries? purple & grey are more common, red & blk are often primary but I suppose each manufacturer will have their standard.

27th November 2004, 03:45 PM	#1
commstech diyAudio Member Join Date: Oct 2002 Location: SINGAPORE	Paralleling transformer secondaries. If i have a trans that has a pair secondary outputs 30V and the trans is rated 225VA. Assuming my requirement is only one of the 30V secondary; can i simply parallel the two secondaries and achieve better VA rating? Ok, if it does not improve VA, any harm will come of it? Anyone plse advise. Thanks.

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27th November 2004, 03:58 PM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, carefully check that you find the 0v & 30v ends of both windings before you connect them. If you connect the 0v to the other 30v then you end up with 60v into a short circuit. I suggest you connect them in series first & check you have 60v into open circuit. Get it right & you have twice the current capacity at the same voltage i.e. 30v 7.5a Q how do you check series primaries are correct before you connect the mains? regards Andrew T.

28th November 2004, 06:53 AM	#5
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, if red/yellow gave 60v when blk/orange connected then common red & orange and common blk & yellow. Unusual colours for secondaries? purple & grey are more common, red & blk are often primary but I suppose each manufacturer will have their standard.