Help! Can someone clarify to me how sense current with EI current transformer ?

[sahu]

Help! Can someone clarify to me how sense current with EI current transformer ? it o\p we for over load sensing .....
pl help me

 

[Orson Cart]

What is the max load current you are trying to sense? what is the freq or repetition rate? what sort of signal to you want to get?

 

[sahu]

What is the max load current you are trying to sense? what is the freq or repetition rate? what sort of signal to you want to get?

i want it use my home load [mix]. its rating 15 amp sence .ac 220 volt

 

[Orson Cart]

OK, you need an EI steel laminated core, about 15x15mm cross section (approx) in the centre pole, 200 turns for the CT winding, 1 turn for the 15 amp winding, this will give you 75mA on the 200T winding (max), a 13.33 ohm burden resistor, will give you 1 volt rms, DO NOT leave the 200T wdg open circuit when there is current in the one turn winding! Regards, Orson Cart

 

[sahu]

It o/p give me , linear o/p ? like 30amp@2volt ,19.5amp@1.3volt ,15amp@1volt , 11.25amp@0.75volt , 7.5amp@0.5volt .etc .if not .how can find it ?

 

[Orson Cart]

the CT output, a voltage across the burden resistor is AC (and yes, linearly related to the main current), ideally you need a circuit to convert the AC signal to the rms value as a DC level. Regards, Orson Cart.

 

[sahu]

ideally you need a circuit to convert the AC signal to the rms value as a DC level. Regards, Orson Cart.

i can't understand . can u proved me or give me any link circuit to convert the AC signal to the rms value as a DC level.