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Author Topic: Need help regarding ISOLATION TRANSFORMER.  (Read 2523 times)
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jaikumar
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« on: May 29, 2009, 12:21:51 12:21 »

I wired up a isolation transformer like this

1) I have 2 primary 220, 50HZ. Secondary 0-12 volts

I connected the secondary's togother and one primary goes to the mains.

on the other primary I read the voltage with respect to ground i get 55 Volts, should i get zero, because the ground point should be isolated?

Thanks and Regards,
Jai
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DTiziano
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« Reply #1 on: May 29, 2009, 03:42:32 15:42 »

Hi

But do you read the voltage between one leg and ground ?
If yes then what you get depends of the parassitic capacity between the coils.
To get zero volt you need a transformer with a (grounded) shield between coils.

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pickit2
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« Reply #2 on: May 29, 2009, 09:50:07 21:50 »

Bet your Neutral of your mains is at or near ground at sub station. and this is what your reading.
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