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Question

In a turbine generator set R=0.04 p.u. based on the generator rating of 100 MVA and 60 Hz. The generator frequency decreases by 0.02 Hz and the system adjusts to steady-state operation. The turbine output power increases by

A
1 MW
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B
1.2 MW
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C
0.83 MW
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D
0.63 MW
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Solution

The correct option is C 0.83 MW
Given R= 0.04 p.u.

Δf1=0.04×60=2.4 Hz

We know that Δf1ΔP1=Δf2ΔP2

2.4100=0.02ΔP2

ΔP2=0.02×1002.4=56=0.83 MW

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