ETL 1110-2-550
30 May 97
Figure D-1. Annual generation-duration curve
which in this case is 200 MW, the combined capac-
Energy output with original
ity of the four existing generators.
runners when new
828,000 MWh
Energy output with existing
original runners
801,000 MWh
D-6. Energy Gained by New Runners
Energy output with new runners
845,000 MWh
Gain in energy output
44,000 MWh
Figure D-2 describes the gain in energy achieved by
replacing the worn existing turbine runners with
Note that the capacity of the existing generators
new state-of-the-art runners. The middle curve
limits output to a maximum of 200 MW. So, even
shows the output when the original runners were
if the new runners had a somewhat greater
new (overall efficiency of 87 percent), and the lower
megawatt capability, it would not be possible to
curve shows the output with the original runners in
take advantage of that capability.
their existing, worn condition (overall efficiency of
84 percent). The upper curve shows the output with
D-7. Energy Gained by New Generator
new state-of-the-art runners (overall efficiency of
Windings
89 percent). The area between the upper and
middle curve represents the gain in energy credit-
a. Figure D-3 describes the gain in energy
able to the new runners. The upper and middle
curves were derived by applying efficiency adjust-
achieved by rewinding the stators with state-of-
ment factors to each of the points that were used to
the-art insulation materials. The new materials
derive the existing case (Figure D-1) generation-
make it possible to place more copper in the
duration curve. They could also be derived through
windings, which increases the capacity of the
additional simulation studies with a routing
generators. In this example, it is assumed that the
modelsuch as HEC-5.
D-3
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