CT Radio Test

Pass a regulated current through the primary and measure the current on the secondary.

How i can get regulated current ?

Is it AC or DC current ?

Transformers do not work with DC current primaries. That's a very revealing question.

The ratio test is performed by comparing a voltage applied to the secondary winding to the resulting voltage
produced on the primary winding.

For example, if 1 volt per turn is applied to the secondary winding, the voltage present on the primary winding would be 1 volt.

More specifically, if 120 volts were applied to the secondary of a 600/5 current transformer (120:1 ratio), 1
volt would be present on the primary winding.

I am not sure about the voltage method and will go with TonyS

The CTs are inherently low impedence and hence may not be too practicable. The testing of Ratio/ burden etc I have come across with current injection method only.

UD15

The voltage ratio method presented by Tanuja is correct, and is commonly used in the electric power industry. Verify the CT ratio on the nameplate - the voltage ratio will be the reverse (VA in a CT is conserved!). So as he said, on a 600:5 CT (120:1 ratio), if you connect 120VAC to the secondary, you should measure 1 volt at the primary. I've done it myself many times, and it works.

Alarm bell are ringing for me, our guest asks should it be AC or DC….

Ma God.....this is too much...AC or DC?I gues our guest is not even aware of basics......