How does a CT measure current without losing performance at high frequencies?

AI Thread Summary
The Triad Magnetics CST206-3T Current Sensing Transformer (CT) measures current by using a fixed resistor across its secondary winding, which generates a voltage proportional to the primary current. Care must be taken to avoid leaving the secondary open, as this can result in dangerously high voltages. Selecting the appropriate resistor size is crucial for achieving the highest gain without compromising high-frequency performance, and this should be guided by the manufacturer's data sheet. The data sheet provides essential specifications and recommendations for optimal operation. Understanding these details is vital for effective current measurement with the CT.
The Hath
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I am using a Triad Magnetics CST206-3T Current Sensing Tranformer. How does it work? I need to find a resistor to measure the current, while getting the highest possible gain, and without losing performance at high frequencies.

My question is how does the CT measure current?
 
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First of all, be very careful with current transformers. When the secondary winding is left open VERY high voltages can develop between the leads. Don't you have a data sheet for it? Usually current transformers work just like voltage transformers concerning turns ratio. A fixed resistor placed across the secondary will develop a voltage that is representative of the primary current. What size resistor to use should be determined from a data sheet.
 
I am not sure. You can view the data sheet on http://www.triadmagnetics.com/subcategory/shcst.html.
 

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