Effect of Primary Voltage and Conductor Size on Transformer Secondary Short Circuit Current

all the calculation for short circuit current only mention secondary Voltage, KVA, and Impedance , Does the primary voltage and primary cable does not impact the SC current on the secondary side please help me to Know what effect  of  primary voltage and conductor size to determine the Short circuit in transformerregardsL Sunder Murthy

Hi, the secondary side is generally speaking the low voltage side of the transformer, which has the highest current of the 2 sides. This is why the SC calculations are based on secondary values.The primary voltage is not required. The primary cable size has no bearing on a transformer SC calculation in theory. In practice if your cables are undersized you will still have the same SC potential at the transformer, the only difference would be that the cables would be damaged during an SC fault. If your cables are sized correctly they will withstand the SC fault. Or at least have a better chance of withstanding the fault.

Thank you Mr Allan for your reply We are manufacturing testing equipment ,we what to test SC test at 240V on relay at 6kA , we what to generat Short circuit current using transformer primary  415V secondary 240 V 6KA 10ms can we use High KVA transformer taking in to SHort Circuit current calculation 

You can use a high kva  transformer, it just means that you will have a high SC current.

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