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Transformer problem

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smiley325

New Member
I was building a little power supply, when my voltmeter probe accidently shorted the center tap of the secondary to the other AC wire. Before the transformer was stepping 120 V mains to 36 V, but after the short I'm guessing some of the turns on the secondary side got fused because now it is stepping 120 V mains down to only 45 V.

Is it still safe to use this transformer?

Thanks in advance,
smiley325
 

MikeMl

Well-Known Member
Most Helpful Member
Disconnect it from mains, and using ohmmeter, check for any continuity from Primary to Secondary. Should be open or infinite.
 

Hero999

Banned
A primary to secondary short should never happen if it's a class 2 isolation transformer.
 

smiley325

New Member
Clarify

Oh sorry, I should have been clearer: what I meant was I shorted the CT on the secondary to the other wire on the secondary (not sure what its called, I call them + and - but it's AC so...?)

Primary and secondary sides still isolated from each other, open circuit.
 

grim

New Member
a momentary short is unlikely to have damaged the transformer.

any fuses in circuit? DVM can gat confused when one probe is o/c and make up readings.

if in doubt grab an AVO;)
 
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