Which connection type has neutral wire in a three-phase system?

Which connection type has neutral wire in a three-phase system?

• A. Delta connection
• B. Wye connection
• C. Series connection
• D. Grounded connection

Answer: (B)

In a three-phase system, the Wye connection is characterized by the presence of a neutral wire. In a Wye configuration, each phase is connected to a common neutral point, allowing the system to provide a neutral that can be used for grounding and balancing loads. The neutral wire in a Wye connection enables the system to maintain a stable voltage level, particularly under unbalanced load conditions. It provides a path for return currents and allows single-phase loads to be connected safely. Additionally, the neutral can help in ensuring that the phase voltages remain at the same level, which is essential for the efficiency and safety of electrical systems. In contrast, other types of connections, such as the Delta connection, do not have a neutral wire because each phase is connected directly to the other phases without a common point for return. Series connections do not apply in this context as they are not a valid configuration for three-phase systems. Grounded connections refer generally to bond the system to the earth for safety purposes rather than describing a specific configuration like Wye or Delta. Therefore, Wye is the distinct configuration that incorporates a neutral wire, fulfilling important functions within a three-phase system.

In a three-phase system, the Wye connection is characterized by the presence of a neutral wire. In a Wye configuration, each phase is connected to a common neutral point, allowing the system to provide a neutral that can be used for grounding and balancing loads.

The neutral wire in a Wye connection enables the system to maintain a stable voltage level, particularly under unbalanced load conditions. It provides a path for return currents and allows single-phase loads to be connected safely. Additionally, the neutral can help in ensuring that the phase voltages remain at the same level, which is essential for the efficiency and safety of electrical systems.

In contrast, other types of connections, such as the Delta connection, do not have a neutral wire because each phase is connected directly to the other phases without a common point for return. Series connections do not apply in this context as they are not a valid configuration for three-phase systems. Grounded connections refer generally to bond the system to the earth for safety purposes rather than describing a specific configuration like Wye or Delta. Therefore, Wye is the distinct configuration that incorporates a neutral wire, fulfilling important functions within a three-phase system.