NINE MILE SUBSTATION
Wallula, Washington
OWNER—FPL ENERGY
Walla Walla, Washington
The Nine Mile Substation is essentially two substations in one. It has five 34.5-kV main collection system feeder breakers permanently connected to the 250 MVA 230-kV step-up transformer, and an outdoor 34.5-kV rack with seven feeder circuit breakers that are switchable between the 230-kV step-up transformer and the 100 MVA, 115-kV step-up. This switching flexibility allows the operator to better match incoming generation to plant output requirements and transformer capacity. The substation also has twelve 2-stage, 9 MVAr capacitor banks to control power factor.
Wallula, Washington
OWNER—FPL ENERGY
Walla Walla, Washington
The Nine Mile Substation is essentially two substations in one. It has five 34.5-kV main collection system feeder breakers permanently connected to the 250 MVA 230-kV step-up transformer, and an outdoor 34.5-kV rack with seven feeder circuit breakers that are switchable between the 230-kV step-up transformer and the 100 MVA, 115-kV step-up. This switching flexibility allows the operator to better match incoming generation to plant output requirements and transformer capacity. The substation also has twelve 2-stage, 9 MVAr capacitor banks to control power factor.
