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This paper describes the evaluations performed on the New York State Electric and Gas Corparation's (NYSEG) 115 kV Goudey-Oakdale line and Goudey and Oakdale substations to assess the capability of the existing equipment to operate as part of a six phase demonseation project. This paper also describes the design modifications that will be made to meet the goals of the commercial demonstration and to allow integration into the existing three phase operating grid. Reconfiguration of an existing double circuit line tb a single circuit six phase line requires installation of phase reconfiguration transformers at the end of the line terminals and the associated switching, metering and proteotion equipment. In addition, the phase conductors from the terminals of the transformers have to be transposed for connection to the transmission line to achieve the desired 60' vectorial separation anglebetween adjacent phase conductors. This requires innovative approaches to achieve phase reconfiguration that are economical. technically adequate and constructible and that provide design insights for future six phase lines. Concepts of substation compaction have been pursued when attempting substation modifications for six phase reconfiguration. This is demonstrated by the use of 132 kV metal oxide surge arresters on the 161 kV side of the transformer, the applicationof live tankgas insulated circuit breakers, the utilization of existing s~~c t u r e s within the substation to the extent possible, and the use of railroad ties for transformer support and a membrane based oil containment pit.

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