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# tying DC voltage to a current circuit

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## tying DC voltage to a current circuit

(OP)
I know this shouldn't be done by am trying to understand the "why" of it. Will the dc in the current affect the sine wave of the CT circuit?

Thanks!

### RE: tying DC voltage to a current circuit

It will on the peaks if the core reaches magnetic saturation. Much like a transformer will do with over voltage except with DC only the upper or lower peak will be flat topped..

### RE: tying DC voltage to a current circuit

If you have DC current present in a transformer with a ferro-magnetic core then it will bias the flux in the core so the core does not saturate symmetrically, thus reducing the maximum alternating flux which can be tolerated. If you increase the DC current further the core will saturate and the relationship between primary and secondary windings will become highly non-linear.Introducing an air gap into the path of the flux improves ability of the core to tolerate DC current, at the expense of degrading other core parameters.

### RE: tying DC voltage to a current circuit

it will make the ct saturated then the relationship between primary and secondary will be highly unlinear

### RE: tying DC voltage to a current circuit

Do some searching and some study on magnetic amplifiers. They depend on the effect of DC currents in an AC circuit for their operation.
One but not the only resource:
http://en.wikipedia.org/wiki/Magnetic_amplifier#Pr...

Bill
--------------------
"Why not the best?"
Jimmy Carter

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