In a situation where a transformer fails, what percentage of the load must be carried by the remaining transformers in an open wye-open wye bank?

In an open wye-open wye transformer bank, when one transformer fails, the remaining transformers must continue to handle the load. This type of connection typically comprises three transformers. When one transformer is out of service, the two remaining transformers share the load.

To maintain balance and continue supplying power, the remaining transformers must collectively carry the load of the failed transformer. Since two transformers can effectively support the total load of three, each of the two transformers takes on 50% of the load. Therefore, the overall percentage of the load that must be carried by the remaining transformers is 50%.

This scenario emphasizes the importance of load-sharing capabilities in transformer banks, and highlights how the configuration impacts the performance and reliability of the system during a failure.