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Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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Steady-state stability of a power system is improved by
Reducing fault clearing time
Using double circuit line instead of single circuit line
Single pole switching
Decreasing generator inertia
Using double circuit line instead of single circuit line
Quick Summary: Steady-state stability of a power system is defined by its ability to maintain synchronism under small disturbances. It is directly proportional to the synchronizing power coefficient, which increases when the total reactance of the transmission system is reduced.
Steady-state stability of a power system is defined by its ability to maintain synchronism under small disturbances. It is directly proportional to the synchronizing power coefficient, which increases when the total reactance of the transmission system is reduced.
P=XVsVrsin(δ) — Power transfer equation
Xeq=nXline — Equivalent reactance for n parallel circuits
The maximum power transfer in a transmission line is given by Pmax=XVsVr. By using a double circuit line instead of a single circuit line, the equivalent reactance X of the path between the sending and receiving ends is halved (assuming parallel lines of identical parameters). This reduction in total reactance significantly increases the maximum power transfer capability and the steady-state stability limit.
Steady-state stability depends on maintaining small angular displacement δ.
Reducing line reactance is the most effective passive method to improve stability.
Double circuit lines reduce the net impedance seen by the generator.
Increases the maximum power transfer limit
Reduces transmission line voltage drop
Improves system reliability during single line outages
Higher initial capital expenditure
Increased right-of-way requirements
Long-distance power transmission lines
Interconnected grid networks
Fault clearing time (Option A) relates to transient stability, not steady-state.
Increasing generator inertia (the opposite of Option D) helps improve stability.
Single pole switching (Option C) is a transient stability improvement measure.
B is correct — Using double circuit lines decreases the total transmission line reactance, thereby increasing the maximum synchronizing power limit.
Always differentiate between steady-state stability (improving reactance/voltage profile) and transient stability (faster fault clearing/quick excitation systems).