In a Delta system, the system voltage relative to the coil voltage is which of the following?

In a Delta system, the system voltage relative to the coil voltage is which of the following?

• A. Increases
• B. Decreases
• C. Varies with load
• D. Stays the same

Answer: (D)

In a delta-connected system, each winding is connected directly across two lines, so the voltage across a coil (the phase voltage) is the same as the system line-to-line voltage. Because the coil is driven directly by that line voltage, the ratio of system voltage to coil voltage is 1:1. This means the system voltage relative to the coil voltage stays the same. The key contrast is that, in a wye connection, the line voltage is the square root of three times the coil voltage, changing the relationship.

In a delta-connected system, each winding is connected directly across two lines, so the voltage across a coil (the phase voltage) is the same as the system line-to-line voltage. Because the coil is driven directly by that line voltage, the ratio of system voltage to coil voltage is 1:1. This means the system voltage relative to the coil voltage stays the same. The key contrast is that, in a wye connection, the line voltage is the square root of three times the coil voltage, changing the relationship.