电力试题（Power examination questions）.doc

电力试题（Power examination questions） 1, what is a device? What are the equipments used in the first time? Primary equipment is equipment directly used for power generation and transmission and distribution. Through these devices, electricity can be transmitted from power plants to users The commonly used primary equipment is as follows: (1) a device for producing and converting electrical energy, such as a generator that produces electrical energy and a transformer for converting voltage, A motor operated by auxiliary machinery in a power plant (2) equipment to connect and disconnect the circuit. Such as circuit breaker, isolating switch, automatic air switch, contactor, switch and so on. (3) equipment that limits fault current or overvoltage, such as reactors for limiting fault currents, arresters for limiting overvoltages, arc suppression coils for limiting ground currents, etc. 2, what is the two equipment? What are the two equipments in common use? The two equipment is the auxiliary equipment for monitoring, measuring and operating control and protection of the work of the primary equipment The two commonly used equipment includes the following equipment: (1) protective appliances, used to reflect faults, act on the operating mechanism of the switch apparatus to remove various faults or act on the signal (2) measuring and monitoring equipment for monitoring and measuring current, voltage, power and other parameters in a circuit 3, what is the rated capacity of synchronous generator ` rated voltage current rating? Rated capacity means the maximum output power of the generator for long term safety operation Rated voltage is the highest voltage for the long term safety of the generator. The rated voltage of the generator refers to the line voltage Rated current is the maximum operating current of the generator in normal continuous operation 4. What are the three elements of sinusoidal alternating current? (1) maximum value; (2) angular frequency; (3) initial phase 5.