110v cct's

Gerry53 · 21 Sep 2013

Ihave a 415v step down TX with a secondary output of 110v.
The ZS for the incoming swa is 0.24.
The ZS for the outgoing 110v ccts is a lot lower is this correct?

mfarrow · 21 Sep 2013

Gerry53 said:
The ZS for the outgoing 110v ccts is a lot lower is this correct?

Yes, that is correct because the secondary winding has a small impedance, however you need to calculate the equivalent short circuit current on the 110V side using data from the 415V (or whatever primary) side if you're to get the right figures to prove any protection you have in place will work.

Gerry53 · 21 Sep 2013

mfarrow said:
Gerry53 said:

The ZS for the outgoing 110v ccts is a lot lower is this correct?

Click to expand...

Yes, that is correct because the secondary winding has a small impedance, however you need to calculate the equivalent short circuit current on the 110V side using data from the 415V (or whatever primary) side if you're to get the right figures to prove any protection you have in place will work.

Thanks for that.

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110v cct's

Gerry53

mfarrow

Gerry53

DIYnot Local

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