Stator and Isophase Cooling

Question 1

What system cools the Stator Cooling Heat Exchangers?

Answer 1

Heat is removed from the Stator Cooling Water by two series heat exchangers, which are cooled by Turbine Cooling Water. A Temperature Control Valve adjusts the Stator Cooling Flow through or around the heat exchanger depending on system temperature.

Question 2

What is the makeup water source for the Stator Cooling system?

Answer 2

Demineralized Water (DW)

Question 3

What is the purpose of the Stator and Isophase Cooling system?

Answer 3

Stator and Isophase Bus Cooling system removes heat from the generator stator, connection ring, terminal bushings and the isophase buses.

Question 4

What is the maximum amperage for the isophase bus if no fans are running?

Answer 4

The isophase buses are designed to operate without forced cooling up to 23,000 amps.

Question 5

What does the auto start button (CEN-HS-29B) do?

Answer 5

starts the standby pump. both pumps continue to run until manually secured

Question 6

Describe a loss of 125 vdc to the Stator Cooling control panel

Answer 6

all stator cooling water trips for the main turbine are disabled