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Plotting Overcurrent TCC on High/Low Side of Xfmr

Plotting Overcurrent TCC on High/Low Side of Xfmr

Plotting Overcurrent TCC on High/Low Side of Xfmr

(OP)
When plotting multiple time-current curves showing coordination between various protection devices, what is typically done to show the coordination between the high and low side of the transformer? If the X-axis shows the multiple of pick-up or current, the low voltage side will be graphed as picking up much quicker than the high side due to the transformer turns ratio. Do I need to reflect the primary fault current to the secondary so the curves reflect the correct coordination?

Thank you

RE: Plotting Overcurrent TCC on High/Low Side of Xfmr

Yes, you transpose curves using the transformer turns ratio.

RE: Plotting Overcurrent TCC on High/Low Side of Xfmr

Any good coordination program will do that for you.

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