A 3 phase 208 volt transformer configured in a "Y" has how many windings of 120 volts?

In a 3-phase transformer configured in a "Y" (or star) connection, each phase winding is connected to a common neutral point. The line voltage in a 3-phase system is higher than the phase voltage. For a 3-phase system operating at 208 volts, the phase voltage can be calculated using the formula:

Phase Voltage = Line Voltage / √3.

In this case, you would have:

Phase Voltage = 208V / √3 which is approximately 120 volts.

Since there are three phases in a 3-phase transformer, each phase has its own winding that produces this 120 volts. Therefore, there are three separate windings, one for each phase, which generates a phase voltage of 120 volts.

This configuration allows for balanced loads across the three phases. It’s important to note that if one of the phases were to go down, it would affect the phase voltage available at the output, but as long as all three phases are operational, the output voltage will indeed be 120 volts across each of the three windings. Hence, there are three windings of 120 volts in a 3-phase, 208 volt transformer set up in a "Y" configuration.