Having discussed four regions/countries in the eastern hemisphere where 19 of the projects are located, we turn to the opposite side of the world for the remaining project. One World Trade Center Tower (see Figure 13), in New York, is set to become the tallest building in the western hemisphere in 2013.
There is no difference. 'Star' and 'wye' are alternative names for the same connection. Similarly, 'delta' and 'mesh' are alternative names for the same connection.plit and merge into it. Answer by Awaygood. Confidence votes 22.5K. There is no difference. A three-phase ' star ' connection is simply another name for a ' wye ' connection. 'Star' seems to be the preferred name in Britain, whereas, 'wye' seems to be the preferred name in North America-although this is debatable.
While connected in wye, the motor will draw 1/3 the current that it will in delta, which is great for starting, but it will also produce 1/3 the torque, which can be good or bad, depending on the load. This is the reason you see wye-delta starters and wye-delta motors. You can limit the inrush current to the motor and not hammer a load with a big mechanical shock while starting. If you take a small (1hp) motor and start it across the line in wye, it will start smoothly but if you reconnect it in delta and start it, the motor will jump because of the torque.