![]() Sum the total horsepower of all motors on system (optional but recommended). 1- Input data: the input Data for this Fault Current Calculations spreadsheet will be: Select the secondary voltage of used transformer. Siemens - Estimated Available Fault Current Calculation Spreadsheet. Stack height(ht) / tongue width(aTw) = (some ratio). Short Circuit Calculations Spreadsheets No.1. However any ratio till 2 can be taken which would call for making ones own former.If the ratio is greater than 2 we select a higher tongue width (aTw) ensuring all the conditions as above. At the worst case we take the ratio equal to 2. Stack Height = Gross core area / Tongue width ((available) (atw)).For commercially available former size purposes, we approximate stack height to tongue width ratio to the nearest following figures of 1.25, 1.5, 1.75. including Hall Effect devices, current transformers for switched mode power. If this condition is not satisfied we go for a higher tongue width ensuring the same condition with a corresponding decrease in the stack height so as to maintain approximately constant gross core area.Thus we get available tongue width (Twavail) and window area ((avail)(aWa)) from the core table. The Magnetics Curve Fit Equation Tool is an Excel file for design engineers. ![]() ![]() 1.3For the above calculated value of tongue width, we choose core number and window area from the core table ensuring that the window area chosen is greater than or equal to the Gross core area. ![]() This value is approximate and may have to be modified, depending on the actual winding method.Window area (Wacal) = Total area (TA). ![]()
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