- #1
jaus tail
- 615
- 48
Homework Statement
Homework Equations
critical clearing time proportional to square root of (H / (P times frequency) ) equation 1
Power remains same as alternator at 1p.u
Frequency is also same
H will increase.
It's not given so we can assume machines swing together, so H = H1 + H2 = 2H since they are identical.
If machine wouldn't swing together it'd be H1. H2/ (H1 + H2)
The Attempt at a Solution
So now we get from equation 1 time(clearing) proportional to Square root of H
So 0.4/(new tcr) = (square root of (H/2H) = 0.707
So new tcr = 0.567sec
Answer is D
Book answer is B
How?