초록 ▼

In a Francis type pump turbine, for the purpose of switching the operation of a synchronous dynamoelectric machine from synchronous condenser operation wherein compressed air is admitted into a runner chamber to force down water level therein so as to cause a runner to rotate in air, to a synchronou

In a Francis type pump turbine, for the purpose of switching the operation of a synchronous dynamoelectric machine from synchronous condenser operation wherein compressed air is admitted into a runner chamber to force down water level therein so as to cause a runner to rotate in air, to a synchronous generator operation, the air is released from the runner chamber and an inlet valve and guide vanes are completely or nearly completely closed. Then the inlet valve and guide vanes are gradually opened until a predetermined degree of opening is reached while maintaining the degree of opening of the guide vanes to be larger than that of the inlet valve. After the predetermined degree of opening, both the inlet valve and the guide vanes are gradually opened. But at this time the degree of opening of the inlet valve is maintained to be larger than that of the guide vanes. To switch from the generator operation to the condenser operation the same characteristic curves are traced in the opposite direction.

대표청구항 ▼

In a Francis type pump turbine comprising a runner chamber, a runner disposed in said runner chamber and directly coupled to a synchronous dynamoelectric machine for operating the same as a synchronous condenser or a synchronous generator, a spiral casing disposed to surround said runner chamber, gu

In a Francis type pump turbine comprising a runner chamber, a runner disposed in said runner chamber and directly coupled to a synchronous dynamoelectric machine for operating the same as a synchronous condenser or a synchronous generator, a spiral casing disposed to surround said runner chamber, guide vanes disposed between said runner chamber and said spiral casing, an inlet valve positioned at an inlet of said spiral casing, and a draft tube connected to said runner chamber, a method of controlling an operation of said Francis type pump turbine comprising the steps of completely or substantially completely closing said inlet valve and said guide vanes; admitting compressed gas into said runner chamber to press down water level therein to a predetermined level in said draft tube so as to cause said runner to rotate in said gas thereby operating said synchronous machine as a synchronous condenser; releasing said gas from said runner chamber; and then initiating opening of said inlet valve and said guide vanes so as to switch the operation of said dynamoelectric machine from synchronous condenser operation to synchronous generator operation.