In addition to meeting ConEd’s stringent standards for noise, ABB had to ensure that the transformers meet tight limits on weight, width and height to permit transportation in Manhattan. The transformers also have to comply with technical requirements like overload of up to 200 percent and extremely tight limits on the range of transformer impedance.
ABB delivered the first ultra-low-noise transformer to ConEd in 2005. This transformer had to be provided with a sound enclosure. As the technology developed further, subsequent transformers delivered to ConEd did not need these enclosures and in fact were much smaller in size and weight. Six of these transformers have been delivered to ConEd and several are already in operation. Four additional transformers of even lower noise levels are scheduled for delivery later this year and in early 2009.
The ultra-low-noise transformer technology resulting from this development is now being used to produce optimum designs for low and ultra-low-noise transformers for other noise-sensitive metropolitan areas around the world.
The above accomplishment would not have been possible without the support that the ABB technical team received from ABB management in St. Louis, USA and globally. The challenge given and cooperation received from the ConEd technical team, headed by Donald Chu and Harold Moore, throughout the technology development process have been pivotal.