TCC x-axis current on different voltage base

[timm333]

When I plot TCC curves in ETAP, it gives me current on horizontalaxis at a voltage of 480V. This is ok for breakers on the transformersecondary side because they are at 480V. However the relay on the transformerprimary side is at 13.8 KV. Does TCC automatically convert the current of relayat 13.8kV to a current at 480V and then plot it on the same 480V base together withlow voltage breakers? Is it possible to plot TCC with current on the x-axiscalculated at a base voltage of 13.8kV (instead of 480V)?

 

[kingpb]

When I plot TCC curves in ETAP, it gives me current on horizontalaxis at a voltage of 480V. This is ok for breakers on the transformersecondary side because they are at 480V. However the relay on the transformerprimary side is at 13.8 KV. Does TCC automatically convert the current of relayat 13.8kV to a current at 480V and then plot it on the same 480V base together withlow voltage breakers? Is it possible to plot TCC with current on the x-axiscalculated at a base voltage of 13.8kV (instead of 480V)?

Yes, and Yes. You can actually show both voltages simultaneously on the same TCC.

In plot options, go to the axis tab, uncheck the autoscale box to change the default scale.

On that same screen you can check the secondary x-axis box and specify your voltage.