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EVM430-F6779

Hello,

i want to use this device to measure rated currents of 1A, 2A, 5A and 10A.
In the Apllication Report (http://www.ti.com/lit/an/slaa577e/slaa577e.pdf) the EVM430 is used with CTs. Most CTs i find are specified for rated currents of 30A or above. So is it also possible to use a simple shunt instead of the CT?

In another post ive seen that CTs are already included in the package. (http://e2e.ti.com/support/microcontrollers/msp430/f/166/t/334379.aspx) Is that true? And where do i get the specifications of these CTs?

Thank you

  • A simple shunt won’t provide galvanic separation. You’ll have to deal with different GND reference levels. You’ll easily end up with high voltages between the voltage sense input and a different phase shunt.

    However, there are many CTs for lower currents available. They usually have a 1A output. The main use here is to provide isolation/separation. But there are others with a much smaller output (we use 100A->33mA and 400/600A->66mA CTs, with a 7.5 or 15Ohm shunt on the secondary side for 500mV output)

    See here for a ‘small’ list from just one manufacturer.

    The number of windings in the list gives the input/output ratio.

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