What is the minimum rating required for a transformer bank supplying a 3Ø, 45 KVA load?

For a transformer bank supplying a three-phase load of 45 KVA, the minimum rating of the transformer bank must match or exceed the load it is intended to service. Since the specified load is 45 KVA, the transformer bank should have a rating that can handle this capacity to ensure it operates efficiently and reliably under full load conditions.

Using a transformer with a rating less than 45 KVA could lead to overheating, reduced efficiency, and potential failure under full load, which makes it essential for the transformer to meet or exceed the 45 KVA requirement. Therefore, selecting a transformer bank with a minimum rating of 45 KVA is necessary to ensure it can adequately support the load without risk of damage or operational issues.

Higher ratings than 45 KVA are certainly acceptable and may provide an additional safety margin, but the minimum required to meet the demand of the 3Ø, 45 KVA load is indeed 45 KVA. This ensures not only that the load is fully supported but also contributes to the system's overall reliability and longevity.