Discussion
Identify whether the given statements related to power swings in a power system are true or false.
1. The presence of a power swing does not necessarily mean that the system is unstable.
2. The relay must distinguish between a fault and a power swing and respond correctly.
Answer: A
Both statements are true. A power swing is an oscillation of the machine rotor angles after a disturbance, such as a line switching or fault clearing, and a stable system rides through it and settles down, so a swing does not necessarily mean that the system is unstable. Because a swing can look to a distance relay like a fault (the impedance moves into the relay's zone), the relay must tell the two apart, which is done by power swing blocking, so that it trips for a fault but not for a stable swing.
Hence true and true is the right pair, option A.
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