I have a question I have a CT with 1

[jbdavid]

I have a question I have a CT with two taps 1s1-1s2 200/5 1s1-1s3 300/5. Can I used them both example for metering and relaying cause I have only one core.

Thanks and regards

 

[submonkey]

Hi,

You can't do that. There is one continuous secondary winding
on the CT with taps at 40 turns and then 60 turns. The primary
has one turn. The (amps * turns) on the primary needs to equal
the (amps * turns) on the secondary, and if you attempt to use
both ratios at once, the amp turns won't balance as you expect.

You can get 100/5 by connecting between 1s2 and 1s3 for whatever
that's worth.

Thanks,
Alan

 

[hikpras]

It's better for you, to use only 1 core (for example the highest one : 300/5), then you connect to the relay. And for the meter, you can use ACT with ratio 5/1 or 1/1 depend on you need. the ACT connect in series with the relay.

 

[jghrist]

You can put the relay and the meter in series on the same tap.