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NET Framework Version 3.5 or higher to run.
SHORT CIRCUIT CALCULATIONS EXCEL ISO
NET initiative and later approved as a standard by ECMA (ECMA-334) and ISO (ISO/IEC 23270:2006). The language was developed by Microsoft within its.
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SCA V1.0 was written in C# programming language, best viewed as a descendant of both C++ and Java languages.
SHORT CIRCUIT CALCULATIONS EXCEL WINDOWS
SCA V1.0 for Windows operated PCs - System Requirements & Troubleshooting The total motor contribution depends on factors such as motor FLA, voltage, the reactance of the systems at the point of the fault and the reactance of the motor. If the calculated X/R ratio at any given point in the electrical distribution system exceeds the tested X/R ratio of the overcurrent protective device, alternate gear with adequate X/R rating should be considered or the device effective rating must be reduced.įurthermore, electrical motors are contributing short circuit current back into the system during a fault condition. For example, all low-voltage protective devices are tested at predetermined X/R ratios.
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Knowing the fault X/R ratio is essential when selecting electrical and protection equipment. Also, the decay of the DC component depends on the X/R ratio of the circuit between the source and the fault. The asymmetrical component decays with time and will cause the first cycle of a fault current to be larger in magnitude than the steady-state fault current. The total asymmetric current is a measure of the total DC component and the symmetrical component. The peak asymmetric fault current is also determined by X/R ratio.
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Similarly, the impedance for conductors within the electrical system are also broken down into X and R components of the impedance. For instance, transformer ratio of reactance to resistance (X/R) is used along with transformer percent impedance to determine X and R values on a per unit bases. The calculations become more complicated when resistance values are replaced with an impedance values. To determine fault current at various locations within power system, the system characteristics such as available short circuit value at service entrance, line voltage, transformer KVA rating and percent impedance, conductor characteristics are utilized. Simple point-to-point short circuit fault current calculations are carried out using Ohm's law and equipment resistance values. Files for single-line diagrams are saved with the *.sca file extension by default.Īdditional information about Short Circuit Analytic All the data for a system can be saved by clicking on File menu and then selecting Save or Save As menu items, or pressing Save button on the toolbar.
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