I have learnt from some source that there is a device called neutral compensator .Iwould like to know about it in detail.
A while back, I was a postdoc at MIT, and my techician and I accidentally discovered that the grounded 120 V ac outlets in our lab was actually 3 phase 120 V power, ground being the third phase. In discussing this with the utility people, the big transformer powering the building was a 3-phase delta output, and not a wye output, so they chose one of the 3 [STRIKE]wye[/STRIKE] delta legs as ground. In order to balance the load, about 1/3 of the building got each pair of outputs from the transformer [STRIKE]wye[/STRIKE] delta. We were in the 1/3 of the building that got the pair where ground was the third [STRIKE]wye[/STRIKE] delta leg. How could a polyphase transformer correct this problem?It's special type of polyphase transformer (usually three-phase) which is wound in such a way as to balance the line phases as much as possible, thereby reducing the neutral current. It's connected on parallel across the load. Its phase-balancing capability also means that if you lose a phase entirely, it will regenerate the missing phase, albeit at a lower voltage than normal.