Current Transformers on each core of a 3 phase line

Windadct

J_B

The configuration is called "open delta"- and can be used to transform 3 phase from 2 transformers. Use Google Images to to see a number of examples.

J_B

NascentOxygen,

Now what? Now I will try to calculate what torque I can achieve from this secondary micromotor to see if I can do anything with it. Or what force I can generate from a linear actuator (lead screw torque calc)

Windadct,

Thanks for this - good info.

J_B

Carl Pugh

"Something like this: http://schumo.ch/products_motors.htm" is for single phase actuators.
One current transformer on one line would kinda work. When the line current got above some value, the actuator would activate and when the line current got below some level the actuator would de-activate.
Of course when the line current got too high, the actuator would burn up.
What are you trying to do?

J_B

I'm trying to see if I can open and close a flow valve. Just need to work out how much force I can get out of an appropriate linear actuator run off 2 or 3 CT's.

Carl Pugh

Operating on 1 current transformer will probably work as well as operating on 2 or 3 current transformers.
You should select a solenoid valve and then select or design the current transformer.
Select solenoid valve based on required flow rate. Select valve with low power requirements.
If you do a throrough Google search, there may be a valve that will do what is required without a current transformer. And again there may not be any such valve.
Good Luck
Carl