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20151129 Daily Question: The rewards are as follows: 1-3 points for participation, 5 points for a correct answer, and 8-10 points for a correct answer along with an analysis. The main characteristics of a limited-capacity system are: ( ) A. The system voltage drops during a short circuit. B. The short-circuit current changes with voltage. C. The system’s short-circuit capacity decreases. D. The system impedance decreases. A B
Main characteristics of finite-capacity systems: (A)
Main characteristics of limited-capacity systems: (b) B. Short-circuit current varies with voltage
A. The system voltage drops during a short circuit. B. The short-circuit current changes with the voltage
Answer: A, B. Since it is a system with limited capacity, assuming the system capacity is P, where P=UI, the current during a short circuit is much greater than the current under normal conditions. As the system capacity is limited, U must decrease. Similarly, during a short circuit, the current varies with voltage.
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