For a delta connected device, what is true about the line voltage compared to the phase voltage?

For a delta connected device, what is true about the line voltage compared to the phase voltage?

• A. It is doubled
• B. It is equal
• C. It is halved
• D. It varies

Answer: (B)

In a delta connection, each phase of the device is connected across the line voltage, which means that the line voltage is the same as the phase voltage. This occurs because in a delta configuration, the voltage across any two phases is what is considered the line voltage, and each phase sees the full line voltage. Thus, under a balanced condition, the relationship between the line voltage and the phase voltage is such that they are equal. This foundational concept is crucial for understanding three-phase systems, as it influences how voltages are calculated and how they affect load characteristics in such systems. In contrast, in a star (or wye) connection, the relationship is different, where the line voltage is √3 times the phase voltage. Recognizing the difference in these configurations is essential when dealing with three-phase systems.

In a delta connection, each phase of the device is connected across the line voltage, which means that the line voltage is the same as the phase voltage. This occurs because in a delta configuration, the voltage across any two phases is what is considered the line voltage, and each phase sees the full line voltage.

Thus, under a balanced condition, the relationship between the line voltage and the phase voltage is such that they are equal. This foundational concept is crucial for understanding three-phase systems, as it influences how voltages are calculated and how they affect load characteristics in such systems.

In contrast, in a star (or wye) connection, the relationship is different, where the line voltage is √3 times the phase voltage. Recognizing the difference in these configurations is essential when dealing with three-phase systems.