回线

This paper introduced an eigen-mode decomposing method to decouple zero sequence parameter in double circuit. The decomposing matrix of eigen-mode component is given. The zero sequence component relationship between voltages or currents at two terminals of double circuit was achieved by composing eigen-mode components.

提出一种采用特征模量分解方法对同杆多回线间的零序参数解耦，并给出了同杆双回线零序参数特征模量分解矩阵，通过特征模量分解得到同杆双回线路两端之间的零序电量关系。

The EM field of arbitrary point in an irregular loop can be considered as the sum of the EM field of many circle loops in the irregular loop at the point. Therefore the authors may obtain the EM field of the irregular loop as long as the authors work out the EM field of each of the circle loops.

不规则回线内任一点的电磁场可以看成是其内部多个圆形回线在该点的电磁场之和，因此，只要求出不规则回线内各个圆形回线在该点的电磁场，将它们叠加就可得出不规则回线在该点的电磁场。

The company mainly produces: 50 pairs, 100 pairs, 200 pairs 110 patch panel, 6-core, 12 core fiber optic splice tray, 25 pairs high-frequency module, 25 pairs crimping modules, 24 buttons, 48 button patch panel, network with wire rack, cable management rack, super 5 class 6 class module, the information panel, the card access module junction box and other cabling products; and 25 back-line security arrangements, 32 back to line test row, 100 loop security arrangements, 128 back to line test row, various types of security modules, alarm device, install rack series of communications products such as MDF.

公司主要生产：50对、100对、200对110跳线架，6芯、12芯一体化熔接盘，25对高频模块，25对压接模块，24扣、48扣配线架，网络配线架，理线架，超5类、6类模块，信息面板，卡接模块，分线盒等综合布线系列产品；以及25回线保安排，32回线测试排，100回线保安排，128回线测试排，各类型保安单元，告警装置，安装机架等总配线架系列通信产品。

Our company mainly produces: 50 pairs, 100 pairs, 200 pairs 110 wiring block,Cat5e 110 wiring block;6-core, 12 core splice tray and fiber optic splice tray;25 pairs high-frequency module, 25 pairs crimping module,66M module,Clamp Module,3M2810 Tool-Free Connector Module; 24 buttons, 48 button patch panel, Cat5e patch panel,Cable Rack Management, Cable Tray, Cat5e and Cat6e module,face plate,junction box and other cabling products and tools; 25,100 return wire insurance arrangements, 32,128 return wire testing arrangement as well as various types of security modules, alarm device, install rack series of communications products.

公司主要生产：50对、100对、200对110跳线架，超5类110跳线架，6芯、12芯一体化熔接盘及光纤盘，25对高频模块，25对压接模块，66M 模块，卡接模块，3M2810免工具接续模块，24扣、48扣配线架，超5类配线架，理线架，走线槽，超5类、6类模块，信息面板，分线盒等综合布线系列产品和各类网络布线工具；以及25，100回线保安排，32，128回线测试排，各类型保安单元，告警装置，安装机架等总配线架系列通信产品。

In order to study characteristics of the early signal with TEM, the authors formulated self-induction formulae for single coil and multi-turn coils, deduced theoretical expressions for the amplitude of the loop self-induction signal, and gave the induction of single coil and multi-axial coils. The response curve of buried object affected by the coils nod the length of loop's change are also studied.

为研究瞬变电磁早期信号的特性，讨论了多匝线圈与单匝线圈的自感系数的关系，得出线圈自感信号振幅的理论表达式，推导了单匝和多匝回线的电感公式，分析了回线匝数和回线边长的变化对目标体响应曲线的影响。

This回抽three points should be said that 1800 has posed a more obvious pressure, but today will be on the final trading day of its decision directly on the closing line, the amount can not be released to show that closed on line and short-term back pumped into the critical period, if confirmed at the early stage of 1800-2300 Box破位effective, then the A shares of the bottom of the road, I am afraid will continue; the contrary can be cautiously optimistic.

这回抽三点应该说，1800年有较明显构成压力，但今天将在其决定最后一个交易日的收盘线直接，金额不能公开表明对线和短期封闭式长期回注入了关键时期，如果证实，在2300至00年的早期阶段箱破位有效，那么道路底部的A股，恐怕将继续下去；相反，可以谨慎的乐观。

There are 120 kinds of faults occurred in double circuit lines, for the existence of the cross country fault s.

但是，由于同杆双回线会发生跨线故障，致使同杆双回线的故障种类多达120种，并且同杆双回线的故障计算和分析十分复杂。

This paper starts with the different characteristic between simple line fault and cross country fault ,new method for identifying simple fault and cross country fault is put forward.

从同杆并架并架双回线跨线故障和单回线故障的不同电气特征出发，分析了现有的主要选相元件在同杆并架线路发生跨线故障时所存在的问题，提出了基于跨线故障识别的同杆并架双回线故障选相的新方案。

Parallel lineonsametowers is regardedas oneprotectedunit.The directional relay is based on same directional negative sequencecomponents .Because of influence of mutual inductance, directional protection onsingle line has to be latched-up during cross line fault between different phases, thisshortcomingis eliminatedinthis newprinciple.

该原理利用同序负序分量实现方向比较，将双回输电线看作一个被保护单元，消除了原有基于每一回线的方向元件在双回线非同名相跨线故障时受双回线线间互感影响需将保护闭锁的缺点。

Power system ; HVDC power transmission ; Ground return ; Metal return ; Ground return transfer switch; Metal return transfer breaker

电力系统；直流输电；大地回线；金属回线；大地回线转换开关；金属回线转换开关

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。