Substation replacement options and considerations

There are many things to consider when evaluating the replacement of a distribution substation. Establishing the electrical configuration, process considerations, equipment sizes and ratings, what options to include, and their relative initial cost, are all part of defining and establishing the best design for a project. The loss or interruption of electrical power during operating periods is not an acceptable option at most refining facilities. This creates difficulty conducting electrical maintenance and tie-ins. Aspects such as safety, capacity, expandability, and cost must also be considered to ensure that the installed design offers real long-term benefit and value to the organization. While the absolute minimum on equipment sizes and ratings can always be determined, it is finding the best balance between pre-investment and costs that offers the most value. This paper will describe some of the options and considerations that were evaluated at the distribution substation level for a large petroleum refinery, and how those decisions led to a degree of standardization for the electrical configuration.