Power plant having a cooling system, method for operating such a power plant, method for modifying a power plant

A method for operating a power plant comprising:

• cooling at least one generator by means of one generator heat exchanger which is exclusively a component of an additional cooling water circuit,
• wherein the additional cooling water circuit during normal operation of the power plant is separated from a closed cooling water system by means of at least one shut-off valve so that the cooling water of the additional cooling water circuit which leaves the one generator heat exchanger is recooled exclusively via a refrigerating machine,
• wherein, when a value falls below a previously defined lower limit value of mechanical power on a generator shaft of the generator, normal operation is automatically left by opening the at least one shut-off valve and by switching off the additional cooling water circuit so that the generator cooling is no longer carried out via the additional cooling water circuit but instead via the closed cooling water system that is connected to the one generator heat exchanger, and wherein, when the limit value is exceeded again, normal operation is resumed again by closing the at least one shut-off valve and starting up the additional cooling water circuit.

A method for operating a power plant, the method comprising:

• cooling the at least one generator by means of one generator heat exchanger which is exclusively a component of an additional cooling water circuit,
• wherein the additional cooling water circuit during normal operation of the power plant is separated from the closed cooling water system by means of at least one shut-off valve so that the cooling water of the additional cooling water circuit which leaves the one generator heat exchanger is recooled exclusively via a refrigerating machine,
• wherein the at least one shut-off valve of the additional cooling water circuit is in the event of a failure of the refrigerating machine automatically opened and the one generator heat exchanger is connected to the closed cooling water system.