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Current Transformer Ratings.

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asimraufawan

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Hi all,

I need a small CT for very less load application which is 3 Watt to 60 Watt load at 220 VAC & current will be from 13 mA to 300 mA.

It is very first time i am dealing wit current transformer so i m confused how will i select the C.T & what should be the rating of C.T for this application
 

Following should be considered

Frequency of operation (current frequency, which you want to sense)
Turn ratio: should be such that you can sense smallest current (13mA) reliably and at higher current should not lead to saturation.
Secondary side resistance: Also known as Burden. This will basically converts the current into voltage for further processing.
Loss you can tolerate, this would also be related to accuracy
Mounting type

Hope this helps.
 

I need to measure 0-0.5 ampere of current & to convert these value on 0-5 vdc scale for microcontroller, what rating of C.T should be used
 

10:1 C.T should be enough for this current. Also i have attached the circuit design Application note so read it and work according to it
 

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  • CT Design example.pdf
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