What should remain connected to maintain capacity in an open wye-open wye setup after a transformer failure?

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In an open wye-open wye transformer setup, maintaining capacity after a transformer failure is crucial for continuous operation and system stability. The correct response is that two transformers should remain connected.

This is because in a wye configuration, each transformer contributes to the overall capacity and load sharing within the system. If one transformer fails, the remaining transformer or transformers need to be capable of handling the load demand to prevent system overload or instability. Having at least two transformers connected ensures that there is sufficient capacity to support the system, providing redundancy and maintaining the necessary voltage levels.

If only one transformer is left connected, it may be unable to adequately support the entire load, leading to potential voltage drops or interruptions in service. Therefore, keeping two transformers connected allows for a smooth continuation of operation, even after one has failed. The design and functionality of transformer setups often rely on redundancy to enhance reliability and minimize downtime.