Is the high side ground floated on a wye-delta closed transformer bank?

In a wye-delta closed transformer bank configuration, the high side (wye side) is indeed floated. This means that the neutral of the wye connection is not grounded or is deliberately kept isolated from ground.

Floating the high side allows for various benefits, such as reducing the chances of ground faults affecting the system. This configuration is utilized to help with voltage stabilization and reducing the impact of unbalanced loads. Additionally, keeping the high side floating prevents nuisance tripping of protection devices, as it maintains certain operational characteristics beneficial in specific applications – such as industrial environments where ground faults may be transient rather than persistent.

In this arrangement, while the delta side is typically grounded for safety and stability, having the wye side floated provides greater operational flexibility and can help avoid potential imbalances or unintentional grounding problems.