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Insulation coordination, environmental and system analysis of existing double circuit line reconfigured to six-phase operation

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5 Author(s)
Stewart, J.R. ; Power Technologies Inc., Schenectady, NY, USA ; Oppel, L.J. ; Thomann, G.C. ; Dorazio, T.F.
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Conversion of an existing double-circuit 115 kV overhead transmission line near Binghamton, New York to six-phase operation will provide a commercial demonstration of feasibility of high phase order power transmission. Analyses of insulation performance, corona and field effects, and a load flow and system stability have been performed as part of the preliminary engineering for this project. It is shown that conversion of the Goudey-Oakdale double-circuit 115 kV line to 93 kV six-phase is possible if insulator strings are lengthened to 8 units/string. This results in a 40% increase in thermal loading capacity and a doubling of surge impedance loading, while meeting all applicable electrical environmental requirements

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Power Delivery, IEEE Transactions on  (Volume:7 ,  Issue: 3 )