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Current transformers (CT’s), like traditional transformers, convert voltages and currents based on their turns ratio. The most important relationship for CT's is primary amp-turns equaling secondary amp-turns (Ip Np = Is Ns). This series of CT's uses a customer supplied single turn primary through the center to carry the large circuit current. An appropriate turns ratio and terminating resistor are selected to supply a voltage, Vs = Is Rb, for the monitoring circuit.
To match your monitoring circuitry to a specific CT, you need to know the CT characteristics in relationship to input current, turn ratio, and frequency range. The Rb referenced in the curves below is defined as Rb = 1 Volt/Is, the value which will yield one volt per amp output, where Is=(Np/Ns) Ip. To assist with choosing Rb, see graphs below. Lower or higher Rb values can be used for your specific requirements. Contact a Precision engineer for assistance (See buttons below).
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