With the help of this Fault Current Calculator Excel form, you can rapidly estimate the fault current based on the MVA rating of the transformer and the secondary voltage.
Excel Calculator
This tool makes it simple to input transformer data and obtain fast results for your three-phase system. It also simplifies complex fault current calculations, which are otherwise difficult to perform.
What is Fault Current?
The fault current in transformers is the maximum current that can flow through a power system in the event of a failure, such as a short circuit.
MVA Calculation
The MVA (Mega Volt-Amperes) rating of a transformer indicates its apparent power capacity. To calculate a transformer’s MVA, apply the following formula:
Formula
MVA = (KVA X 100)/(1000 X Z%)
Where
KVA – Transformer KVA Rating
Z% – Impedance %
Fault Current Calculation
To determine a transformer’s fault current using the MVA rating & secondary voltage, apply the following formula:
Formula
IFault (KA) = (MVA X 103)/ (√3 X VSecondary)
Where
IFault (KA) – Fault Current (in KA)
MVA – Transformer Rating
VSecondary – Transformer Secondary Voltage
√3 – 1.732 – 3 Phase System
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 to quickly calculate fault current based on transformer MVA rating & secondary voltage. This useful tool makes it easier to analyze electrical faults.){kind=link}