补全短文 1 P1 Functions of power transmission The function of (power transmission) is to send power from power plants to load center or to exchange power between networks in order to attain the generation-consumption balance or the supply-demand balance between (power networks). Power transmission is completed by step-up substations, (step-down substations and connected transmission equipment). The transmission line mainly consists of the transmission conductors (transmission at high voltage) can reduce the line loss and the voltage drop, ensure the power quality, raise the economy of (power network operation). The increase of transmission line voltage can not only raise the amount of transmitted power, but also reduce the line loss and line voltage drop, and improve the voltage quality. 功率传输功能 （输电）的功能是要把电力从发电厂负荷中心或功率交换网络之间为了达到代消费平衡或供求之间的平衡（电网）。电力传输是通过升压变电站完成，（降压变电站和连接传输设备）。输电线路主要由输电导线（高压输电），可以减少线路损耗和电压降，保证电能质量，提高经济性（电网运行）。输电线路电压的增加不仅可以提高输电线路的传输功率，而且可以降低线路损耗和线路压降，提高电压质量。 A . step-down substations and connected transmission equipment 降压变电站和连接传输设备 B. power network operation 电网运行 C. power transmission 功率传输 D. transmission at high voltage 高压直流输电 E. power networks 一。 电力网络 P2 A brief introduction on the development of supercritical boilers and their main advantages In ( some advanced countries )such as U.S.A, Japan and European countries, the supercritical boiler has been developed since the 60s of last century. It has been proved by data and experience, the supercritical unit has (great advantages on economy and environmental protection). As for its ...
