電力系統(tǒng)的演化外文翻譯-其他專業(yè)(完整版)
【正文】 ed threephase system. ● Use synchronous machines for electricity. Prime movers convent the primary sources of energy (fossil, nuclear, and hydraulic) to mechanical energy that is, in turn, converted to electrical energy by synchronous generators. ● Transmit power over significant distances to consumers spread over a wide area. This requires a transmission system prising subsystems operating at different voltage levels. Electric power is produced at generating stations (GS) and transmitted to consumers through a plex work of individual ponents, including transmission lines, transformers, and switching devices. It is mon practice to classify the transmission work into the following subsystems: 1. Transmission system 2. Subtransmission system 3. Distribution system The transmission system interconnects all major generating stations and main load canters in the system. It forms the backbone of the integrated power system and operates at the highest voltage levels (typically, 230kV and above).The generator voltage are usually in the range of 11 to 35 kV. These are stepped up to the transmission voltage levels, and power is transmitted to transmission substations where the voltage are stepped down to the subtransmission level (typically, 69 kV to 138 kV).The generation and transmission subsystems are often referred to as the bulk power system. The subtransmission system transmits power in smaller quantities from the transmission substations to the distribution substations. Large industrial customers are monly supplied directly from the substransmission system. In some systems, there is no clear demarcation between substransmission and transmission circuits. As the system expands and higher voltage levels bee necessary for transmission, the older transmission lines are often relegated to subtransmission function. The distribution system represents the final stage in the transfer of power to the individual customers. The primary distribution voltage is typically between kV and kV. Small industrial customers are supplied by primary feeders at this voltage level. The secondary distribution feeders are supply residential and mercial customers at 120/240V. 翻譯： 電力系統(tǒng)的演化 商業(yè)用電始于 19 世紀(jì) 70 年代后期，弧燈用于燈塔照明和街道照明。 第一個完整的電力系統(tǒng)（由發(fā)電機、電纜、熔絲、電表和負(fù)荷組成）是由 Thomas Edison在紐約城的 Pea
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