Short Circuit Analysis in Coordination Focus

Basic ANSI short circuit calculation procedures are provided in the Coordination focus. The calculated short circuit currents can be used in TCC plots to clip the TCC curves of devices or to simply indicate their coordinates.

Fault Bus: To fault a particular bus or a number of buses, select the bus(es) in the one-line, and then in the Coordination ribbon, click Fault Bus (toolbar menu: Solve > Fault Bus). The fault currents are displayed. For details on short circuit procedures, see ANSI Short Circuit Reference. To fault all buses, select the fault command without selecting any bus on the one-line.

Calculate Remote Bus Voltage and Current

After faulting a single bus you can view the resulting voltage and currents on any other bus in the one-line diagram by selecting the bus, and then clicking the arrow below Fault Bus to select Remote V and I. To view the voltage and current of a number of remote buses you can either select all the desired buses at one time or continue to select and then select Remote V and I one after another. The remote bus values that appear on the window are cleared when you fault another bus.

Figure 1: Viewing Remote V & I

Line End Fault

You can perform line end fault on a branch by selecting a breaker/fuse at the end of the branch, clicking on the arrow below Fault Bus, and then clicking Fault Line End.

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