1. What are the main components of a power system? Answer: A power system is composed of several key parts, including power plants that generate electricity, transmission and distribution lines that carry the electricity over long distances, substations that step up or step down the voltage, and end-user units that consume the power. 2. What is meant by the term "power grid"? Answer: The power grid refers to the network responsible for transmitting, transforming, and distributing electrical energy within a power system. It includes all the infrastructure involved in moving electricity from generation sources to consumers. 3. What are the advantages of large-scale power systems? Answer: 1) Enhanced reliability of power supply, as failures in one area can be compensated by other parts of the system. 2) Reduced need for excess reserve capacity due to better load management. 3) Efficient load distribution helps balance energy usage across different regions. 4) Improved power quality through more stable voltage and frequency control. 5) Facilitates the utilization of large-scale power resources, such as hydropower, which can be efficiently integrated into the grid. 4. What are the characteristics of electricity production? (1) Simultaneity – electricity must be generated and consumed at the same time. (2) Concentration – power generation typically occurs at centralized locations. (3) Applicability – electricity must meet specific technical requirements for use. (4) Preemptiveness – planning and maintenance must be done in advance to ensure continuous supply.
Sample Exam Questions (Multiple Choice - Choose the best answer): 1. The power network consists of (A). A. Power transmission, substation, power distribution B. Power generation, power transmission, substation 2. Using electricity in a more reasonable way is associated with (B). A. A larger difference between peak and valley loads B. A smaller difference between peak and valley loads 3. If the voltage is too low, it may cause an asynchronous motor to (C). A. Vibrate B. Experience insulation damage C. Overheat and burn out 4. During a short circuit, the characteristic is (C). A. High voltage B. Small current C. Very high current 5. The closing current of a circuit breaker refers to (C) passing through its contacts. A. Normal current B. Load current C. The maximum short-circuit current that the circuit breaker is designed to handle.
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