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Current Sense Transformers

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If you can conceptualize it, draw it, sketch it or describe it, we can wind it for you. Of course, if you have an engineering print of it, we can serve you even better.


Current Sense Transformers are used to measure current for power management and controls, applications in safety protection and in current limiting. This current monitoring function is used in all frequency ranges - from 50/60 Hz to Khz. Current transformer uses a single turn primary. The primary winding is not built into the transformer itself. It has an opening or hole for the primary wire to go through. The number of secondary turns determines the current ratio.

The CT Series is used for 50Hz/60 Hz to 200 Hz current sensing applications. Typically uses are in watt meter, electricty dispensers, power calibrators, power transducers, precision power meters, digital meters for power systems and server motors.

The 72-000, 72-100, 72-200, 72-300, 72-400 and 72-500 series current sense transformer are mainly used in 20 Khz and above range, like in a switch mode power supply. The secondary inductance shown in our specification data is measured at the given voltage level ( the test voltage freq. is set at 15.75 Khz) shown at the right of the inductance value.

The terminating resistor is also called the "burden resistor", and it is the resistor across the secondary terminals. The voltage across the terminating resistor is equal to Terminating Resistor divided by Number of secondary turns. This is the voltage that is being measured by the engineer for current monitoring purposes.

The primary Unipolar rating refers to single ended wave forms ( swing from zero to positive) such as in forward topology, etc. Primary bipolar primary waveform refers to double ended topology ( swing from positive to negative). These ratings are in Amperes-microseconds, and it is the maximum at which the transformer core will not saturate. Amp-microsec is the current flowing through the primary multiply by the ON time. The peak primary current these transformer can handle is up to 35 Amps.

 

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