transformer troubles please help

troublecomes · 29th December 2005, 07:25 AM

Hello.
i got some transformers made in india on my way back to Australia.

Im a bit worried about them though. They dont seem to be working.

What looks like the primary windings (really thick and stiff) i plugged into the mains (240V in aus) it tripped the circut breaker. So i measured the resistance of these wires and they are about 0.06 ohms, ie nothing. How could this transformer ever hope to work? It obviously drew a lot of current and tripped the breaker.

The secondries(smaller red wires) have about 12 ohms resistance.

I asked for 240V to 22V. It has written on the side of it 0-22V not sure what this means?

I hope i havent been ripped off.....

consort_ee_um · 29th December 2005, 10:03 AM

You or the supplier have got the primaries and secondaries mixed up.
The primary is the high resistance winding!

AndrewT · 29th December 2005, 10:07 AM

Hi,
in the few milliseconds it took for the trip to cut off, the primary was trying to produce 2500V across the windings.

Take care!!!!

Do you have single primary and single secondary on each transformer?
Then easy to connect.

If you have dual primary and/or dual secondary then be very careful how you connect the windings. If out of phase then you could burn out the transformer or if you are lucky the CB will trip again.

consort_ee_um · 29th December 2005, 10:22 AM

Crossposting see this:
voltage ok?

d3imlay · 31st December 2005, 11:40 AM

When working on projects like this use a variac to bring up power. If a variac is not available, use a light bulb in series with the load (xfmr in this case) to prevent damage. There's no excuse for tripping breakers. Work safe!

29th December 2005, 07:25 AM	#1
troublecomes diyAudio Member Join Date: Nov 2005 Location: perth	transformer troubles please help Hello. i got some transformers made in india on my way back to Australia. Im a bit worried about them though. They dont seem to be working. What looks like the primary windings (really thick and stiff) i plugged into the mains (240V in aus) it tripped the circut breaker. So i measured the resistance of these wires and they are about 0.06 ohms, ie nothing. How could this transformer ever hope to work? It obviously drew a lot of current and tripped the breaker. The secondries(smaller red wires) have about 12 ohms resistance. I asked for 240V to 22V. It has written on the side of it 0-22V not sure what this means? I hope i havent been ripped off.....

29th December 2005, 10:07 AM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, in the few milliseconds it took for the trip to cut off, the primary was trying to produce 2500V across the windings. Take care!!!! Do you have single primary and single secondary on each transformer? Then easy to connect. If you have dual primary and/or dual secondary then be very careful how you connect the windings. If out of phase then you could burn out the transformer or if you are lucky the CB will trip again. __________________ regards Andrew T.

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29th December 2005, 10:03 AM	#2
consort_ee_um diyAudio Member Join Date: May 2004 Location: Hertfordshire	You or the supplier have got the primaries and secondaries mixed up. The primary is the high resistance winding!

29th December 2005, 10:22 AM	#4
consort_ee_um diyAudio Member Join Date: May 2004 Location: Hertfordshire	Crossposting see this: voltage ok?

31st December 2005, 11:40 AM	#5
d3imlay diyAudio Member Join Date: Sep 2004 Location: Ohio	When working on projects like this use a variac to bring up power. If a variac is not available, use a light bulb in series with the load (xfmr in this case) to prevent damage. There's no excuse for tripping breakers. Work safe!

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