If a transformer is banked and connected wye on the low side, what system voltage would it yield?

When determining the system voltage yielded by a transformer that is banked and connected in a wye configuration on the low side, it is important to understand the relationship between line voltage and phase voltage in a wye system. In a wye connection, the line voltage is equal to the square root of three (√3) times the phase voltage.

In typical scenarios where transformers are used, the low side voltage for a wye-connected transformer is often specified in terms of line-to-neutral voltage rather than line-to-line voltage. For example, the 4160-volt system typically refers to a configuration where the line-to-line voltage measures 4160 volts, making the phase voltage approximately 2400 volts (4160 volts / √3).

The given choice of 4160 volts 3-phase 4-wire indicates both the three-phase aspect and the presence of a neutral wire that is typically used in wye systems, allowing for the dual capability of providing both single-phase and three-phase power. This is commonly seen in distribution systems involving transformers that are designed to supply a mix of load types.

The other choices present different voltage levels and configurations, but the choice of 4160 volts best matches the standardized configuration that's commonly seen in the field