What needs to be confirmed to parallel banks together aside from voltage and impedance?

To parallel banks together, it is essential to confirm the displacement, which refers to the phase angle difference between the voltages of the two systems that are being paralleled. When two or more transformer banks are operated in parallel, their outputs must not only match in voltage and impedance but also be in proper phase alignment. If the transformers are out of phase, it can lead to circulating currents that may cause overheating and potential damage to the equipment.

In essence, parallel transformers need to have the same phase displacement to ensure that they can share the load properly without causing imbalances. This phase relationship is crucial for the operational efficiency and stability of the entire system. Therefore, checking for proper displacement is a key step in ensuring safe and effective operation when paralleling transformer banks. Understanding this concept is vital for anyone working in electrical distribution and transformer operation.