The transformer load calculation can also be performed in terms of current ratings. Click on Calculate to see the resulting variable. Then, also select if the service is three phase or single phase. To use it, enter the data of two of the three, amps, KVA (kilovolt amps), or volts. Typically, the range is between 3kVA to 1000 kVA. This calculator provides the missing variable in the three transformer characteristics. KVA Autotransformer = kVA of two winding transformer / (1 – k) Loss Calculation: A few examples stating available sizes of transformers used commercially are 75 kVA, 112.5 kVA and 750 kVA. KVA rating of the autotransformer is equal to the kVA rating of the two winding transformers divided by one minus transformation ratio. The conductor Weight of the autotransformer is equal to the difference between the conductor weight of the two winding transformers to transformation times of the conductor weight of the two winding transformers.Īutotransformer Conductor = (1 – k) x two winding transformer conductor kVA rating calculation: demand load (kW) Power factor after correction Transformer type Permissible loading percentage () The nearest standard transformer rating (KVA) 2.
But autotransformers are having wide advantages such as low copper consumption, less voltage regulation, reduced VA rating, and low losses. Determining the MV/LV transformer rating Input parameters: Primary rated voltage (kV.) Secondary rated voltage (kV.) Max. Learn More: CESC Electricity Bill Calculator, Domestic, Commercial Per Unit Rate Relationship between the autotransformer and two winding transformers:Īutotransformer and two winding transformers can be used in place of each other.
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