通信传输线路中架空路线的勘探与设计

通信建设的发展速度加快,架空线路方法在通信传输线路设计中使用比较广泛。因而,本文简单概述了通信传输线路里面的架空线路勘探以及架空路线设计,以供参考。

通信传输线路架空路线的勘探与设计

通信传输线路通常是给有线通信提供支持的,而架空路线是通信传输线路中的核心构成部分,在勘探与设计方面有非常多的关键点必须要严格控制。据此,本文首先简述了通信传输线路架空路线工程,然后分析了通信传输线路架空路线勘探的关键点,最后探讨了通信传输线路架空路线设计的关键点,希望以此为广大研究相同问题的人士提供参考。

电力配电架空路线的运行及管理

对电力系统而言,电力架空路线是一个不可缺少的组成部分,它直接关系到电力系统工作的稳定性和安全性,保证电力架空路线运行的安全性,是电力企业的一项重要工作.在电力架空路线的实际运行中,由于受到外界环境、自身设备等因素的影响,容易发生故障,降低供电质量,给人们的生活和生产造成不便.为此,有必要加强对电力架空路线安全运行的管理,通过科学有效的管理措施,提高电力架空路线的运行水平.

浅析通信传输线路架空路线的勘探与设计

随着现代社会经济的迅速发展,人们的工作生活越来越离不开网络,传输线路工程的建设质量也受到人们的高度重视。其中,通信传输线路架空路线的搭设是传输线路工程的重要建设环节,做好其勘探与设计工作对提高通信效果有着十分重要的现实意义。本文对通信传输线路架空路线的沿路勘探、施工地点勘探以及电磁环境勘探进行了分析,并提出了其相关的设计应用,以期能够为当前的通信传输线路架空路线的搭设提供参考。

高速公路下穿铁路箱桥顶进铁路线架空方案设计与施工措施

为贯彻落实以人为本、服务运输、强本简末、着眼发展的建设理念,确保工程设计的技术先进性、运营安全性和经济合理性,2011年铁道部要求新建公路与客运铁路线交叉时,应优先采用公路立交下穿客运专线的设计方案,因此,为保证既行铁路的行车安全,高速公路新建时下穿铁路箱桥的铁路线路架空方案与施工就成为了高速公路施工的关键。以商丘至周口高速公路商丘段二期穿越京九铁路立交工程为例,对线路架空方案设计与施工进行探讨,以期为类似工程项目提供参考。

架空线路并沟线夹温度分布研究

为了更清楚地了解输电线路线夹的故障原因,需要对线夹的温度进行监测。根据架空线路线夹的结构模型和传热学的原理,建立并沟线夹稳态热路模型,研究其整体的温度分布。利用有限元仿真不同环境条件下并沟线夹横截面部分的温度场分布情况,同时设计并沟线夹不同测温点的稳态温度的实验进行验证。根据此实验结果得出有限元仿真计算结果与实验结果最大误差在±5%以内,验证了模型的正确性。同时对进一步准确计算线夹内部的实际温度和了解线夹的发热状况提供理论基础。

架空输电线路应用摄影测量技术分析

随着摄影测量技术的成熟和发展,在架空输电线路工程中的应用摄影测量技术得到广泛重视。本文对摄影测量在架空输电线路中的应用现状进行分析和总结,并对其发展趋势提出一点看法。

探讨电力架空线路施工技术及处理方法

随着我国社会经济的发展,电力工程建设规模逐步扩大,架空线路被广泛应用于电力工程中。但是,由于受多种因素的影响,电力架空线路施工中存在诸多问题。探讨了电力架空线路施工中的常见故障,提出了有效的处理方法,旨在保证电力工程的施工质量和进度,实现经济效益和社会效益双丰收。

人工挖孔扩底桩在跨铁路线建筑中的应用

人工挖孔扩底桩是一种成熟的桩基形式,但该桩型很少应用于跨铁路线建筑基础工程中。在多数工业建筑中,跨铁路线建筑独立基础的施工多采用机械大开挖,且为保证铁路线上火车的正常运行,必须采取较常用的轨道架空技术,而该技术存在耗资大、施工周期长等诸多弊端。此文根据工程实例,对人工挖孔扩底桩在跨铁路线建筑中的成功应用进行了交流。

超声波导线高度测量仪的原理及应用

介绍了超声波导线高度测量仪的原理，推导了超声波的衰减过程，给出了超声波速与空气温度的关系。研制的仪器对２３．７ｍｍ钢芯铝绞线的测量高度可达２０～２５ｍ，测量精度为１％±１ｃｍ，可同时测量三根导线，能自动进行温度补偿。

小角度下穿铁路地道桥线路架空方案设计

在下穿铁路地道桥建设中,为保证既有铁路的通行不受影响,在施工时需要先对既有铁路线进行加固和架空,确保在不影响铁路行车条件下完成地道桥的施工。架空方式合理与否将对整个工程项目的安全、经济、工期产生重大影响。以下穿德天铁路地道桥为例,分别采用D便梁架空线路、门式墩架空线路和铁路线开断后大开挖三种架空方案进行对比设计,分别从设计和施工的角度对三种工法的优缺点进行比较分析,最终得出了对于技术标准低、行车对数少的支线铁路,铁路线开断后大开挖施工是一种相对投入较小,对铁路影响相对较小的工法。

Hand-eye-vision based control for an inspection robot's autonomous line grasping

In order to ensure that the off-line arm of a two-arm-wheel combined inspection robot can reliably grasp the line in case of autonomous obstacle crossing,a control method is proposed for line grasping based on hand-eye visual servo.On the basis of the transmission line's geometrical characteristics and the camera's imaging principle,a line recognition and extraction method based on structure constraint is designed.The line's intercept and inclination are defined in an imaging space to represent the robot's change of pose and a law governing the pose decoupling servo control is developed.Under the integrated consideration of the influence of light intensity and background change,noise(from the camera itself and electromagnetic field)as well as the robot's kinetic inertia on the robot's imaging quality in the course of motion and the grasping control precision,a servo controller for grasping the line of the robot's off-line arm is designed with the method of fuzzy control.An experiment is conducted on a 1:1 simulation line using an inspection robot and the robot is put into on-line operation on a real overhead transmission line,where the robot can grasp the line within 18 s in the case of autonomous obstacle-crossing.The robot's autonomous line-grasping function is realized without manual intervention and the robot can grasp the line in a precise,reliable and efficient manner,thus the need of actual operation can be satisfied.

The Protection against Lightning of an Overhead Line Uprated from 225 kV to 400 kV

The voltage uprating of existing overhead lines is an interesting solution for increasing the transmission of electricity, especially in areas where it is difficult to build new lines. If a line is uprated with minor changes of its design and without improvement of the grounding electrodes of towers, its lightning performance remains unchanged. The consequence is that the uprated line will have a lightning flashover rate very high compared to an overhead line of same nominal voltage but of standard design. One attractive solution to solve this problem is to use line arresters. The goal of this paper is to study the use of line arresters to achieve a satisfactory lightning performance of an overhead line uprated from 225 kV to 400 kV without major design modifications. In order to compare different strategies of line arrester installation the flashover rate is calculated based on a software able to launch automatically EMTP-RV. The software named LIPS has been developed under the cover of a partnership between Hydro-Quebec, RTE and EDF.

Prototype Line Crawler for Power Line Inspection

In South Africa, electricity is supplied through thousands-of-kilometers of overhead power cables, which is owned by Eskom the national energy supplier. Currently monitoring of these overhead power cables are done by means of helicopter inspection flights and foot patrols, which are infrequent and expensive. In this paper, the authors present the design of a prototype power line crawler （inspection robot） for the monitoring of these overhead power lines in South Africa. The designed prototype power line crawler is capable of driving on the wire, balancing on the wire and is capable of maneuvering past certain obstacles found on the overhead power cables. The prototype power line crawler is designed to host a monitoring system that monitors the power line as the inspection robot drives on it. Various experimental tests were performed and are presented in this paper, showing the capability of performing these tasks. This prototype inspection robot ensures a platform for future development in this area.

Software Tool for the Implementation of the Methodology for Revitalization of High-Voltage Overhead Power Lines

In power systems, a large number of OPLs （overhead power lines） are more than 40 years old and some even exceed 50 years old. The key issue for power systems managers, public utilities companies and electrical engineers today concerns the manner in which available financial resources should be invested in these OPLs to provide the greatest impact on the power system as a whole and to address the OPLs that require urgent revitalization. This paper presents the application of the software tool RevOPL, developed using Microsoft Access utilizing the ＂methodology for revitalization of high-voltage OPLs＂. The aim is to present both the methodology and software to objectively evaluate the condition of an OPL and determine its remaining service life. The application of this software tool provides a proposal for the scheduling and scope of planned revitalization activities, which are obtained through the optimization of the technical characteristics while remaining within the available budget.

Prototype Monitoring System for Power Line Inspection by Means of a PandaBoard

The national energy supplier （Eskom in South Africa） supplies electricity through thousands-of-kilometers of overhead power lines. The current methods of inspection of these overhead power lines are infrequent and expensive. In this paper, the authors present the development of a prototype monitoring system for power line inspection in South Africa. The developed prototype monitoring system collects data （information） from the overhead power lines, is remotely accessible and fits into a power line robot. The prototype monitoring system makes use ofa PandaBoard （SBC） with GPS receiver and 5 MP camera to collect data. Hardware fatigue is the biggest problem faced on the overhead power lines and is captured by means of the 5 MP camera and is displayed on a website hosted by the PandaBoard via Wi-Fi. The monitoring system has low power consumption, is light weight, compact and easily collects data. The data obtained from the prototype monitoring system was satisfactory and provides an improved solution for monitoring power lines for Eskom in South Africa.

Development of a Genetic Algorithm for Evaluating the Performance of Overhead Power Distribution Lines and Proposing Solutions to Improve Distribution Line Safety

This paper aims to present and discuss the use of a power flow methodology based on Gauss elimination method to evaluate the performance of distribution network taking into account the neutral conductor absence at specific sections, and a development of a methodology based on GA （genetic algorithm） capable of evaluating alternative solutions in different bars of the feeder, in order to propose appropriate solutions to improve the distribution network safety. Besides the technical aspects, the proposed GA methodology takes into account the economic feasibility analysis. The results of power flow simulations have shown that the presence of single-phase transformers along with the absence of the neutral conductor at specific sections of the MV （medium voltage） network may increase the Vng （neutral-to-ground voltage） levels of the feeders involved, jeopardizing the system＇s safety. On the other hand, the solutions proposed by the GA methodology may reduce the network Vng levels and improve the safety conditions, providing values close to the ones found before the neutral conductor theft.

Clustering Approaches for Overhead Reduction over Coordinated Multiple Points Network-MIMO Downlink Systems

Owing to the potential for intercell cochannel interference mitigation and significant spectral efficiency improvement, coordinating transmission techniques by multiple radio access points have recently attracted a lot of attention. In this paper, the system structure and mathematical signal model based on clustered structure are presented for multipoint coordinating downlink transmission, the clustered supercell configurations with static/dynamic approaches are discussed, and then optimal precod- ing design is provided for an accepted level of scheduling complexity and reduced signaling over- head. Some simulation results are given to evaluate the performance of different cell-clustering approaches, and to show that a clustered supercell size of 7 is a reasonable choice for clustered coordination with the given transmit power and the reduced feedback.

架空线路禁忌随便排列相序

本文主要在架空线路的禁忌处下文章,在其排列相序的规范问题上进行探讨,从设计和施工的两个角度进行了针对性的分析,对随意排列相序会产生的一些问题进行了分析与解决,解释了架空线路禁忌随便排列相序的原因。

电力工程配网架空线路的施工技术解析

配网架空线路的施工在电力工程施工过程中是一项极为重要且不可忽视的环节。所以,为确保架空线路的施工质量,在此期间,十分有比较并且很关键的就是采取相应的施工技术。而且更应当注重施工技术合理使用的就是在工程施工过程中存在诸多问题的情况之下。电力工程建设随着我国社会经济的发展规模逐步扩大,而被广泛应用于电力工程中的就是架空线路。但是,电力架空线路施工中由于受多种因素的影响有诸多问题存在。本文就对电力架空线路施工中的常见故障进行了探讨,希望能提出了有效的处理方法,进一步保证电力工程的施工质量和进度,从而使经济效益和社会效益双丰收得以实现。