With the 2018.k version, the calculation of short circuit currents in accordance with the IEC 60909 international code is added to the calculation of load flows.
The “Short circuit” section has been created in the toolbar of the program, which includes all the options that allow users to configure and obtain the design results of the short circuit currents:
Calculation of the short circuit current 
Calculates the initial symmetrical short circuit current in the electrical installation for the following short circuit types:
- Three-phase short circuit current
- Two-phase short circuit current
- Two-phase earth connection short circuit current
- Single-phase earth connection short circuit current
Analysis of short circuit loadcases 
With this option, a dialogue box opens where users can view, for each loadcase, two tables which display the design results of the short circuit currents (Results tab) and the short circuit check for switches (Protection tab).
- Results tab
Displays a table containing all the short circuit currents that have been calculated, by phase, maximum and minimum values. - Protection tab
Shows a table that displays the switches that are contained in the installation and checks that the cut-off power of the switch is greater than the maximum short circuit current.
Results view 
This option opens a new toolbar that allows users to configure the view of the results on-screen. Users can choose to:
- View the three-phase short circuit current, two-phase short circuit current, two-phase earth connection short circuit current or single-phase earth connection short circuit current, or all at once.
- Select the desired short circuit phase.
- Select the maximum or minimum short circuit currents.
Results report 
Displays a table containing the short circuit currents, with the maximum and minimum values for each bus displayed in bold. It should be noted that the type of short circuit that gives rise to the highest current depends on the direct sequence, inverse and homopolar short circuit impedance of the system.
Design settings 
This button opens a dialogue box containing 5 sections:
- Voltage factor “c” to calculate the maximum and minimum short circuit currents
Specified in this section are the values of voltage factor “c” of table 1 of the IEC 60909-0 code. These values can be modified and its value affects the calculation of the maximum and minimum short circuit currents. - Default impedance
Users have the option to specify a default impedance value for cases where they consider that the short circuit is not clear (with null impedance). - Cut-off power in switches according to the IEC standard
In this section, users can choose the cut-off power (serviceability or ultimate) that is compared with the maximum short circuit current, for the specific short circuit check of the switch. - Selection of loadcases to analyse
Users can select the loadcases with which the short circuit can be calculated. - Selection of the elements to analyse
The buses or relative positions of the cable for which the short circuit current is to be calculated can be selected here.
Checks 
This option displays a panel containing the short circuit checks that fail. One of these is the validity of the short circuit switches that have been installed.
Show/Hide results 
Shows or hides the short circuit results on-screen.
