供電系統(tǒng)外文翻譯-其他專業(yè)(已修改)
2025-02-04 07:25 本頁面
【正文】 Power Suppying Technology and Intelligent Building The electric distribution system is a part of an electric power system that supplies electric energy to the individual user or consumer .The distribution substations that supply them, the distribution transformers ,and appropriate protective and control devices The three general classes of individual user are industrial ,residential, and rural The threephase alternatingcurrent (ac) system is practically universal ,although a small amount of directcurrent systems are in operation .Threephase transformer and subtransmission lines require three wires ,learned phase conductors. Most of the lowvoltage three phase distribution systems consist of three phase conductions and a mon or neutral conductor ,making a total of four wires .singlephase branches (consisting of two wires)supplied from the threephase mains are used for single phase utilization in residences, small stores ,and farms,loads are connected in parallel to mon supply circuits. The distribution substation is an assemblage of equipment for purpose of switching, changing and regulating the voltage from subtransmission to primary distribution .More important substations are designed so that the failure of a piece of equipment in the substation or one of the subtransmission lines to the substation will not cause an interruption of power to the load The primary system leaving the substation is most frequently in the 635kv range. A particular voltage used is IOkv linetoline and fine to neutral(conventionally written 10/).some utilities use a lower voltage ,such as 3/ use of voltage in the 35kv class is increasing for its lower electric loss Secondary voltages are derived from distribution transformers connected to the prim
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