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Higher Study | Power Systems | Power System Stability

Consider the equal-area criterion graphs shown in the given figure. When the power system is operating such that A2 < A1(case C), the system is said to be:
The stability of a system, when subjected to a disturbance, is assessable by which of the following methods? 1. Swing curve 2. Equal-area criterion 3. Power-angle diagram 4. Power-circle diagram
Which of the following is/are correct? AC network analyzer is used to solve Status i. Load flow problems ii. Short circuit problems iii. Stability problems
Which of the following mainly leads to voltage instability?
For transient stability analysis, as long as equal area criterion satisfied, the maximum angle to which rotor angle can oscillate is
Which colored wire are ground wires that protect appliances from electrical fires?
In a power system, which of the following is/are critical clearance time of a fault related to? 1. Transient reactance 2. Sub-transient reactance 3. Reactive power limit 4. Transient stability limit
Which of the following is NOT an essential quality of protection?
Which of the following is the correct advantage of series compensation in EHV transmission system?
Consider the following statements 1. Value of transient stability limit will be lower than steady-state stability limit 2. Transient stability limit is the maximum flow of power through a particular point in the power system without loss of stability when large and sudden disturbances occur 3. Critical clearing angle is related to the steady-state stability limit Which of the above statement(s) is/are correct?
Transient stability of the generator is dependent on (a) generator reactance; lower reactance decreases peak power and increases initial rotor angle. (b) how heavily the generator is loaded. (c) generator inertia; higher the inertia, slower the rate of the change of angle. (d) generator output during fault Which of the above is incorrect?
Two identical synchronous machines with equal inertia constants are connected in parallel order and oscillating simultaneously. The effective inertia constant is 4 MJ / MVA. What will be the inertia constant of each machine?
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