What type of connection describes a system with a common connection for all three windings?

A system with a common connection for all three windings is accurately described as a Wye connection. In a Wye configuration, each of the three windings is connected to a common neutral point, which allows for the balanced operation of three-phase systems. This arrangement provides several advantages, including the ability to accommodate different loads on the phases and allows for the generation of both line-to-line and line-to-neutral voltages.

Using a Wye connection also enables the system to maintain better voltage stability and current management, which is crucial for many applications in power distribution. Furthermore, this configuration can reduce line losses compared to other arrangements, making it a preferred choice in many power systems. The common neutral point can be beneficial for grounding and helps to improve safety and reliability in electrical installations.