Maker Pro
Maker Pro

Current Transformers

whiterabbott

May 13, 2010
6
Joined
May 13, 2010
Messages
6
I am using a current transformer to build a home energy monitor. What I don't understand is when CT sensors clip onto a wire, that is insulated, would the insulation affect the current reading?
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,510
Joined
Jan 21, 2010
Messages
25,510
No, the current transformer is reacting to the magnetic field around the conductor. Unless the wire is wrapped in an earthed shield it will work.

There are some caveats, but these mostly are that you clip it around the wire you want to measure the current in :)

Beware that an unloaded current transformer can have quite high voltages present on it.
 

whiterabbott

May 13, 2010
6
Joined
May 13, 2010
Messages
6
No, the current transformer is reacting to the magnetic field around the conductor. Unless the wire is wrapped in an earthed shield it will work.

I think I get it now. It is because the magnetic field is a dipole and cannot be insulated but only shielded or redirected.

This stuff always blows my mind.

Thanks,

Dawn.
 
Last edited by a moderator:

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,510
Joined
Jan 21, 2010
Messages
25,510
Well, the magnetic field is a field, but yeah, the rest of it sorta follows.
 

Similar threads

Top