Setting the Short Circuit Method

To select the short circuit calculation method, in the Database Edit focus, select Tools > Options > System, and select the desired standard in the SC Calculation Method box. You can also select the units and symbols appropriate for the selected standard.

Figure 1: Setting Short Circuit Method

To set the IEC Short Circuit calculation method, in the System tab of the Options dialog box, select the following:

• Frequency.
• SC Calculation Method: Set this to IEC.
• Units: You can this to Metric (Optional).
• Symbols: You can set this to IEC (Optional).
• C factor: This is the voltage correction factor (commonly referred to as C Factor). The C Factor is used for modifying equipment impedances and the driving point voltage. IEC recommends calculations for minimum and maximum short circuit currents. Selecting C Factor for Max or Min enables the desired type of calculation. You can perform calculations for only one of the two at any time. The C Factors differ by voltage levels. The default values in the Options dialog box are those recommended by IEC-60909, and are summarized below. You can change these values if needed.

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