Let’s see how to calculate the fault current using MVA Method at Points F1 and F2. Solving the given Network using MVA Method: At the load end of the transmission line F2.
At the high voltage terminals of the transformer F1.Reduce MVA diagram by simplifying the equivalent MVA diagram using the MVA quantities obtained in the previous step.įor this Network find the short circuit MVA and fault current values fed to the symmetrical fault between phases if it occurs at points F1 and F2 that is Step-3: Reduce MVA diagram into a single short-circuits MVA value at the point of fault. Step-2: Combine individual MVA values.ġ) Series MVA’s are combined as resistances in parallel.Ģ) Parallel MVA’s are added arithmetically. The short circuit MVA of each component in the given SLD is equal to its MVA rating divided by its own per unit impedance or reactance. Equipment such as generators, motors, transformers, etc., is normally given their own MVA and impedance or reactance ratings.
In practice, the MVA method is used by separating the circuit into components and calculating each component with its own infinite bus. Step-1: Convert all single line components to short circuit MVA’s. This can be easily achieved with the following three steps.
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