Generators:
The generator casing and the end shields at either end are
welded gastight construction, supporting and enclosing the stationary armature
winding and core, the rotating field, and the gas coolers. The principle cooling
medium is hydrogen gas it also uses stator cooling water. The excitation was
provided by an alterrex excitation system. The excitation system has been
upgraded to a Static Excitation System. The original load rating for each unit
was 755 MW, after the units were placed into service the load rating was
upgraded to 790 MW per unit.
Low-Pressure Generator:
Stator No. 180X403 & 180X391, four pole generator, 1800 RPM
High-Pressure Generator: Stator
No. 180X402 & 180X390, two pole generator, 3600 RPM. The turbine consists of
two sections: a high-pressure section and a double-flow reheat section.
Steam Turbine:
The High Pressure Turbine consists of two sections: a
high-pressure section and a double-flow reheat section. The Low Pressure Turbine
is a double-flow unit with downward exhaust. The steam enters the turbine
through the two crossover pipes from the reheat section of the high pressure
turbine
High Pressure Turbine: Element No.
170X390 & 402, 13 Stages, 3600 RPM
Low Pressure Turbine: Element No.
170X391 & 170X403, 8 Stages, 1800 RPM
Support System:
There are several systems that support the operation of
steam turbine: Lube Oil System, Stator Cooling Water System and the Hydrogen
System.
