What is an advantage of a Wye primary system over a Delta primary system?

The advantage of a Wye primary system over a Delta primary system lies in its ability to provide an increased power carrying capacity. In a Wye configuration, each phase is connected to a common neutral point, allowing for the balancing of loads across the phases. This setup not only accommodates higher voltage levels, which can translate into a greater power transfer capability, but it also reduces the line current for the same power level as compared to a Delta system.

In addition, the Wye connection allows for the use of transformers with higher voltage ratings, which can facilitate the efficient transmission of electricity over long distances. This efficiency contributes to a better overall power capacity because the system can handle greater load demands without needing a proportional increase in current, which can lead to losses in the system.

While options related to installation costs, maintenance requirements, or insulation resistance might have their own benefits, none of them directly pertain to the primary design purpose of enhancing power carrying capacity as effectively as the Wye configuration does. Hence, the primary advantage that stands out in this context is the increased power carrying capacity associated with a Wye primary system.