电网

The lexicographically stratified method for multi-object optimal electric power network planning is presented according to the problem encountered in the research on multi-object electric power network planning.

针对目前研究大规模多阶段多目标电网规划遇到的问题，提出了多目标电网规划的分层最优化方法，使得计算量大幅度降低，避免了多目标函数处理的困难；同时提出的改进最优切负荷模型更易于计算缺电成本，使可靠性指标转化为经济性指标时方便实用，算例证明了本文算法的有效性。

The status of lightning protection and problems, especially low insulation level of lines, lack of direct lightning protection measures, misemploy of lightning arrester and imperfect earth are discussed. Associative action of lightning overvoltage may be considered as the main ...

在此基础上提出了综合防雷措施(包括规范避雷器的安装维护、改善避雷器和杆塔接地、使用塔顶避雷针、使用自动消弧装置降低配电网建弧率、限制雷电流过后的弧光接地过电压和铁磁谐振过电压等)，以提高配电网耐雷水平和供电可靠性。

For increasing the electric power quality of power system,a power quality management system based on electric power Wide-area Net is established,which is a classified and destributed management system,divided into three layers,that is terminal layer;local net power quality data management system;and central data management system,the WAN is used as a communication medium between layers.

摘 要：为了提高电力系统供电的电能质量，江苏电网已建立了一套网络型电能质量管理系统。该系统是一个分层、分布管理系统，系统分成三层，即监测终端、地区电网电能质量数据管理系统和中心数据管理系统，以广域网为层间通信介质。

But there are still many problems in middle and low voltage network result from the neglect of it.

本文对中、低压配电网电能损耗长期高居不下、电压质量差的问题进行了分析，指出了当前配电网规划存在的问题和配电模式的不合理。

With the increasing of the number of power cables and loads in mediumvoltage systems, low-resistance grounding and arc suppression coil groundinghave been the primary grounding methods of the neutral.

随着中低压配电网中电力电缆数量的增加以及用电负荷的增大，系统中性点采用小电阻或消弧线圈接地方式已取代过去的不接地方式成为中低压配电网运行方式的主流。

But the difference tread electrical engineering to also have some weakness, the most is economically to can't carry out scope more wide smooth adjust soon;Have to absorb the 励 magnetoelectricity of 滞 to flow from the charged barbed wire net, make a charged barbed wire net achievement a type factor to lower.

但是异步电机也有一些缺点，最主要的是不能经济地实现范围较广的平滑调速；必须从电网吸取滞的励磁电流，使电网功类因数降低。

In the case of wind turbines operating in parallel with the mains, a fixed mains frequency is assumed.

在风机与主电网并行运行情况下，应设定固定主电网频率。

Reactive compensation device, a new kind of dynamic device which can separately measure the voltage and current signals using PCC as master controller and can sample the signals using programmable amplifier, may pretreat the reference voltage in order to adjust expediently.

0引言在电网中安装并联电容器等无功补偿装置，可就地补偿感性负载所消耗的无功功率，从而减少电网电源向感性负荷所输送的无功功率，降低线路和变压器因输送无功功率造成的电能损耗。

The author interpreted the determinant rule of bad measuring data while power system is in stable state, and implemented the smoothing transition of the measuring results of electrical parameters through curve fitting based on least square while the load in power system is in fluctuation in this paper.

本论文阐述了电网稳态情况下的粗差判定准则，并采用基于最小二乘为准则的二次函数曲线拟和来实现电网负载波动情况下电参量测量值的平滑过渡。

When distributed generation ispresent, meshed distribution networks are in place of radial systems.

配电网的调压和继电保护是以放射状电网为基础设计运行的。

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