电网

The harmonical influence due to the HVDC transmission lines on the AC line protection s using of different principles was analyzed theoretically and experimently.

由于三峡工程将把大容量的高压直流输电系统与交流电网连接起来，形成交直流混合运行的电网，这样运行的电网使得靠近换流站的交流线路保护将受到高压直流输电的强烈干扰。

A ground fault protection is introduced which is not only suitable for unground neutral network, but also suitable for earth neutral system (also called compensation network ) which grounding through arcextinguishing coil connected with a parallel resistance.

介绍一种既适合于中性点不接地电网，又适合于中性点经消弧线圈并电阻接地电网的接地选线保护，该选线保护装置解决了现有接地选线保护不能适应中性点经消弧线圈并电阻接地电网的问题

Because of the serious power supply and the problems in security and stability of the grid, it is very important to have an delaminating and districting operation in Zhenjiang's power grid, thus to prevent the hidden trouble that the high fault current would bring to the secure operation of the power grid, and also the power transmission can be assured at the same time.

在目前供电形式严峻、电网安全稳定问题突出的局面下，合理的对镇江电网进行分层分区运行，减小短路电流过大对电网安全运行带来的隐患将起到非常重要的作用，同时也为镇江电力外送提供保障。

The paper analyses optimal switching devices in the distribution networks, sets up a model to decide to judge types and numbers of switchs in proper location of distribution networks and applies to partical swarm optimization to compute. The simulation system is constituted with matlab. The paper discusses and analyses theory of fault location ,excogitates a synthesis matrix algorithm and an algorithm based on GPRS for fault location and isolation.

本文对配电网开关优化配置进行了分析并建立了数学模型，应用粒子群优化算法来确定配电网馈线相应位置的开关种类和数量并进行了matlab仿真；对故障定位的原理进行了详细的讨论和分析，研究出了故障定位的综合矩阵法和一种基于通用分组无线业务的配电网故障定位与隔离的方法。

The plan splits the State Power Company and regroups its assets into the State Power Net Company, the Southern Power Net Company, and four or five other individual electricity generators.

2002 年 4 月 11 日国务院批准的电力体制改革方案，将从纵横双向彻底拆分国家电力公司，重组国电系统的发电和电网资产，成立国家电网公司、南方电网公司以及四到五家独立发电集团。

The system periodically evaluates the static security and transient stability based on on-line information, which is integrated by state estimation in EMS, the real time actual network data telemetered from control substations, and the typical network operation mode data, selects the optimum generators and load to be shed, accordingly to refresh the control decision tables in two different area control substations every 5 minutes.

河南电网多区域安全稳定紧急控制在线预决策系统综合利用EMS 在线数据、安控实测数据、电网典型运行方式数据，全面定量评估电网安全稳定性（暂态功角稳定和潮流越限），优化紧急控制决策并在线刷新多个区域安全稳定控制系统策略表。

The system periodically evaluates the static security andtransient stability based on on-line information, which is integrated by state estimation in EMS, the real time actual network data telemetered from control substations, and the typical network operation mode data, selects the optimum generators and load to be shed, accordingly to refresh the control decision tables in two different area control substations every 5 minutes.

河南电网多区域安全稳定紧急控制在线预决策系统综合利用EMS 在线数据、安控实测数据、电网典型运行方式数据，全面定量评估电网安全稳定性（暂态功角稳定和潮流越限），优化紧急控制决策并在线刷新多个区域安全稳定控制系统策略表。

In this paper a new contingency screening and ranking method is formed by combiningiterative filtering screening technology with continuation power flow analysis. Researchingpreventive control policy in reactive power compensation and load control when themargin of stability is serious, and reciprocal math model is given;through the exempleof IEEE39 typical system , the availability of the discussed methods in this dissertationwas approved. Aimed at the real grid, the contingency screening analysis and preventivecontrol policy based on Beijing power grid is discussed;the static voltage stabilityanalysis software based on figure draw of Beijing grid is realized, and the software hasthe junction to BPA .

论文提出了将迭代过滤筛选技术和连续潮流法相结合的事故筛选分析方法；从无功补偿控制和负荷控制两方面研究了系统裕度紧张时的预防控制策略，给出了相应的数学模型；采用IEEE39节点的标准系统算例，验证了本文提出的静态电压稳定事故筛选分析方法的可行性；针对实际电网讨论了基于北京电网的事故筛选分析和预防控制策略；通过与BPA接口实现了基于北京电网图形平台的静态电压稳定分析软件。

The power net is injected high frequency impulse signal online from voltage transformer connected to substation bus after the fault of single-phase grounding take place,and then the echo traveling wave from the fault spot corresponding to the high frequency impulse signal is captured by the fault detector installed in the substation.

配电网作为电力系统给用户供电的一个重要环节，它直接给用户提供高质量和可靠的电能，配电网在发生单相永久接地后，为防止发生多点接地短路故障，必须尽快确定故障线路及故障点到供电所的距离，这就是小电流接地电网故障定位问题。

The proposed method can effectively reduce line loss and investment of reactive power compensation in power grids, improve voltage quality and operation benefits.

该方法可以有效地改变中国电网线损率高的现状，提高电网无功补偿的投资效益，有利于提高电网电压质量和运行的经济效益。

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