Which statement is true about delta and wye coil configurations?

Which statement is true about delta and wye coil configurations?

• A. Coils in delta and wye configurations determine line-to-line voltage relation
• B. Only delta exists
• C. Wye cannot deliver power
• D. Delta cannot be used in generators

Answer: (A)

In a three-phase system, how the windings are connected—delta or wye—determines how the line voltage relates to the voltage across each coil. In a delta connection, the line voltage equals the coil (phase) voltage, so the line-to-line voltage directly matches the winding voltage. In a wye connection, each coil is between a line and neutral, so the line-to-line voltage is sqrt(3) times the coil (phase) voltage, with the phase voltage equal to the line-to-neutral voltage. Because the connection scheme sets this relationship, this statement is true. The other options are not correct: both configurations exist and are used, so saying only delta exists or that wye cannot deliver power or that delta can’t be used in generators is inaccurate.

In a three-phase system, how the windings are connected—delta or wye—determines how the line voltage relates to the voltage across each coil. In a delta connection, the line voltage equals the coil (phase) voltage, so the line-to-line voltage directly matches the winding voltage. In a wye connection, each coil is between a line and neutral, so the line-to-line voltage is sqrt(3) times the coil (phase) voltage, with the phase voltage equal to the line-to-neutral voltage. Because the connection scheme sets this relationship, this statement is true. The other options are not correct: both configurations exist and are used, so saying only delta exists or that wye cannot deliver power or that delta can’t be used in generators is inaccurate.