高压电网

The essential insulation information of the main electric equipments(including arrestor,capacitive device,transformer,GIS etc) in substation was also discussed.

1引言高压电气设备在电网中具有举足轻重的地位，如果其绝缘部分缺陷或劣化，将会发生影响设备和电网安全运行的绝缘故障或事故。

The configuration scheme of lightning arrestor protection for converter station, the principle of insulation coordination and overvoltage protection strategy for converter station are analyzed; the parameters and characteristic of lightning arresters are calculated; after analyzing the overvoltage protection for equipments and insulation level of equipments in detail, the discharge voltage of air clearances in converter station is given preliminarily.

自2005年国家电网公司部署建设±800kV直流特高压输电工程以来，组织国内外直流专业公司、科研院所、设计单位开展了广泛的研究工作[1-5]。从主接线方案的比较、户内外直流开关场的选择到绝缘裕度的确定，都从绝缘配合设计的角度进行了研究和比较，取得了大量研究成果[6-11]。

In recent years, high voltage direct current system is rapidly developed, but harmonic pollution is produced and becomes badly, harmonic measurement by true is the precondition and sticking point of restraining harmonic.

近些年来，高压直流输电得到了快速的发展，电网的谐波污染也日趋严重，实时、准确地测量谐波电流信号是有效抑制谐波电流的前提与关键。

In the HVDC engineering, it will produce a series of harmonic which than the fundamental frequency of power grid, and the harmonic have adverse effects with the power systems, equipment and power grids.

中文摘要：摘要：在高压直流输电工程中会产生一系列大于电网基波频率的谐波，而谐波的存在会对电力系统、设备及电网造成不良影响。

Taking the harmonic attenuation of the 10KV power distribution network at the 110KV substation in a smeltery as object of study, this dissertation aims to do research on the control strategies and its industrial application technologies for eliminating harmonic in medium and high voltage power network, prepare theory and teclinological knowledge for its universal application in our country, and accumulate experiences for its high-voltage and high-power application.

本文以某冶炼厂110KV变电站10KV馈电网的谐波治理为研究对象，旨在研究中压、中等容量电网的谐波治理控制策略和工程应用技术，为有源电力滤波器在国内的早日普及应用奠定理论和技术基础，为高压、大功率APF的应用投石问路、积累经验。

This invention relates to a cascade multiple zero-type matrix rectifier, in which, a general input filter is connected between a net and a step-down transformer to get sine-wave input current, the step-down transformer includes n secondary windings with Yn spliced mid lines, the phase of all the three-phase windings is the same, the rectifier array is arrayed in a 1 row x n lines by n zero-matrix rectifier units, each line of which is connected with the seconday winding of the step-down transfornmer, and the outputs of the rectifier units are serial orderly to form a DC output, the general controller is responsible for regulating work of the entire system and connected with the branch controllers by signal cables to control the work of the rectifier units in the array.

本发明涉及一种级联多重化零式矩阵整流器，总输入滤波器连接在电网与降压变压器之间，滤波得到正弦波形的输入电流，降压变压器有n个Yn接带中性线的次级绕组，所有三相绕组相位相同，整流器阵列由n个零式矩阵整流器单元排成1列×n行的阵列，阵列中每一行与降压变压器的一个次级绕组对应连接，阵列中整流器单元的输出依次串联，形成一路直流输出，总控制器负责控制调节整个系统的工作，并通过信号电缆与各个分控制器联络，控制整流器阵列中每个整流器单元的工作。本发明由低压小功率的变换器串联得到幅值可调的高压直流电源，同时在电网侧得到位移为零的输入电流，具有网侧四象限运行能力等优点，适用于中高压直流供电领域。

The background of protective relaying based on travelling wave for transmission lines is introduced and its development at home and aboard is reviewed.

0引言全国高压、超高压输电线路的不断扩建及特高压线路的试建，大容量机组的陆续投运，全国电网的互联对电力系统继电保护的动作速度、可靠性、灵敏度等指标提出了更高的要求。

Specially, in the field of high voltage power system, the standard signal source, which simulates the harmonic of electric power lines, is needed to calibrate the performance of detecting instruments, such as the detection of phase of high voltage electric power lines, the measurement of performance of lightning arresters, the calibration of ammeters, and so on.

特别是在高压电力系统的检测领域，常常需要模拟电网谐波的标准信号源对检测设备的性能进行校验，例如高压电力线路的相位检测，避雷器的性能检测，用户电能表的性能校验等。

The effect of DSM on reducing the peak load value is studied. This paper also introduces the mehtod of dealing with DSM in network planning.

本文分析了DSM 对负荷的调节作用，总结了DSM 对配电网规划的影响，探讨了在高压配电网规划中对DSM 影响的处理方法。

The power generated by the project will be connected into 35KV bus side of booster substation with 22KV via 35KV box substation, and connected into 220KV bus of Chahar Right Middle Banner Desheng 220KV Substation in west Inner Mongolia via one 220KV trolley line that is set up by power grid company See

这项工程所产生的电能将与带有35KV的强力电网总线相连，此强力电网带有可以将22KV转换为35KV的箱式变压所。同时，产生的电能还将通过一条由电网公司建立的220KV高压电线，与内蒙古西部的察哈尔右翼中旗得胜乡220KV变电站的总线相连。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了