高压输电线

• In this thesis , the fault location algorithms of hv transmission line are evaluated at first , then the factors that affect the accuracy of the fault location are analyzed , and the proper solutions are presented
  本文首先对现有高压输电线路故障定位方法进行了综合评述，在此基础上对造成稳态故障测距误差的一些尚未获得满意消除的因素进行了深入的探讨，并提出了相应的解决方法。
• In high voltage power transmission line , in order to ensure power system juxtaposition operation ' stability and bump feeding power up against , at a great many instance , without delay from line ' s terminal excision by the protected line interior fault
  在高压输电线路上，为了保证电力系统并列运行的稳定性和提高输送功率，在很多情况下都要求无延时地从线路两端切除被保护线路内部的故障。
• When faults occur in the transmission line , locating the fault accurately and timely is propitious to eliminate the fault and resupply power . the exact fault location of the transmission line is fundamental to ensure a proper operation of the system
  高压输电线路发生故障时，及时准确地测量出故障位置有利于快速排除故障、恢复供电，因此，故障测距对电力系统安全可靠运行有重要意义。
• In order to compensate for the capacitive charging power of transmission lines , control reactive power flow , stabilize operating voltage and restrict arc current , the shunt reactors are usually installed on ehv transmission lines , especially for uhv transmission lines
  摘要超、特高压输电线路为了补偿线路的容性充电功率，控制无功潮流，稳定网络运行电压，限制潜供电流等，一般要安装并联电抗器。
• On the basis of extensive reading and research of theory of the wavelet , it is presented a practical method based on odd theory of wavelet analysis to remove the white noises from transient fault current traveling waves of high voltage transmission line via multi - size analysis of wavelet
  本文在广泛阅读和深入研究小波理论的基础上，论文提出了一种基于小波分析的奇异性理论对通过小波多尺度变换的高压输电线路故障电流暂态行波信号进行白噪声滤除的实用方法。
• The accurate fault location of the fault position of high voltage transmission line is principal measure for improving safety and economic performance of the power restoration of line , cut down economic loss due to the failure , which has great social and economic interests
  <中文摘要> =高压输电线路故障点的准确定位是提高电网安全经济运行的主要措施，准确的故障定位可以减轻巡线负担，加快线路恢复供电，减小因停电而造成的经济损失，具有巨大的社会和经济效益。
• The precise location of high - voltage transmission line fault is of great significance and practical engineering value . for years , general importance has been attached to the study of faults location by the network operation and management departsments and specialists . but owing to the short developmengt history of faults location techniques and the limits of related techniques , fault location devices with high precision are not widely used in practice . with the development of computer communication technology and the wide application of microcomputer - based protection devices with electric power system , it is possible to locate high - voltage transmission line faults precisely
  多年以来，故障测距问题的研究一直受到电网运行、管理部门和专家学者的普遍重视。但由于故障测距技术本身发展的历史并不长和相关技术条件的限制，具有较高精度的故障测距装置在实际中的应用并不多。随着计算机通信技术的发展和微机保护装置在电力系统中的广泛应用，实现高压输电线路故障的准确定位已经成为可能。
• The following is the main works and conclusions of this thesis . the novel upfc needs high power rate because it is generally used in high voltage transmission lines . after studied high - power converters and the literatures of upfc , the main circuit topology of novel upfc base on diode - clamping multilevel inverter is presented and the principle of using novel upfc to eliminate zero sequence and negative sequence currents is analyzed
  本文所做的主要工作及得出的主要结论如下：由于upfc一般用于高压输电线，其功率等级要求很高，在综合研究大功率变换器和upfc现有文献的基础上，提出了基于二极管箝位多电平变换器的新型upfc的主电路拓扑，分析了用其来滤出高压输电线非全相运行时所产生的零序和负序电流的原理。
• ( 5 ) according to the values measured practically , electromagnetic radiation has some affection to the environment within 25 m around the transmission lines at 500kv , but basically , the intensity around each scale voltage transmission lines mainly satisfy the standard in the scope as calculated above
  ( 5 ) 500kv高压输电线路两侧25m范围内对环境有一定的影响，但线路一般位于农村地带，对人群健康无重大影响。 220kv线路两侧4m内对环境有一定的影响， 110kv线路基本满足环保标准。
• In the middle 1960s , it began to be applied in detecting the fault of electronic facility in foreign countries . in the 1970s , thermal instrument had been installed in helicopter to detect the connection of power line and the determinant standard about infrared test had been established . in the middle 1980s , ir technology had a comprehensive application on the fault of print circuit board ( pcb )
  国外应用红外技术检测电气设备故障始于六十年代中期，七十年代开始把热像仪装在面包车或直升机上对变电站设备或高压输电线路连接件故障做巡回检测，并分别制订出相应的技术规范或红外诊断故障判定标准。