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气体绝缘金属封闭输电线路的应用探析
发布时间:2019-03-23


  电气工程硕士www.hg1717.com|免费注册第四篇:气体绝缘金属封闭输电线路的应用探析
  

  本篇文章目录导航:

  【题目】气体绝缘金属封闭输电线路的应用探析
  【第一章】GIL在城市电网中的发展现状及存在的问题
  【2.1-2.2】GIL的结构组织形式
  【2.3-2.6】GIL输电技术与同相大截面并联电缆的比较
  【第三章】大连500kV架空线路入地改造
  【第四章】GIL技术与同相大截面并联电缆的全寿命周期比较
  【参考文献】城市输电中气体绝缘输电技术的应用研究结论与参考文献
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  气体绝缘金属封闭输电线路的应用探析

  摘要

  随着中国经济的快速发展和城市化进程的加快,城市土地资源愈发显得珍贵,架空线路入地改造、减少土地资源占用成为大势所趋。大连等许多大中型城市核心区域目前仍存在多条500k V及以上的超高压、特高压架空线路,而因其入地改造难度大、技术要求高,将城市超高压、特高压架空线路进行入地改造成为了电力领域研究的新课题。

  在目前电力电缆技术敷设实际应用中,电缆线路敷设与运行基本采用同相单根电缆,而生产厂家能够生产出的最大截面产品为3000? mm2截面的电缆,同相单根电缆受生产技术等方面限制,其运载输送容量上无法满足、支撑超高压、特高压线路输送容量要求。要解决电缆线路的输送能力与超高压、特高压线路输送容量不匹配的问题,理论上可以采用同相大截面并联电缆技术,即通过每相并联2根或多根电缆的方式,来达到增加电缆输送容量的目的。但实际上,同相大截面并联电缆存在施工工艺困难、电缆布置要求高等诸多劣势,并无实际应用。相比较而言,GIL(气体绝缘金属封闭)输电技术具有线路输送容量大、功能模块化、效率高、安全可靠、环保性高、敷设灵活等优势,在电缆敷设中能够替代同相大截面并联电缆技术,从而满足对超高压、特高压线路输送容量要求。目前,大连地区500k V超高压架空线路普遍存在老化现象,架空线路改造与城市规划总体上相矛盾,现有城市土地资源在空间上无法支撑对原有架空线路进行改造。而大连地区目前并没有GIL输电线路的建设和运行经验,GIL输电技术的设计、施工及可靠性有待论证,技术经济效益有待分析。

  本文首先通过将GIL输电技术与同相大截面并联电缆从载流量平衡性、安全可靠性、使用寿命等方面进行优势比较,论证GIL输电技术替代同相大截面并联电缆技术具有必然性;其次,在明确了GIL输电技术在载流量等方面优于电缆技术的基础上,主要围绕GIL输电技术的技术特点、结构组织、可靠性分析、环保性分析等方面内容进行了充分研究;再次,以大连地区500k V输电线路为例,结合大连地区超高压架空电路实际情况,对大连地区超高压输电线路应用GIL输电技术进行入地改造开展可行性研究,并提出设计方案;最后,结合大连地方经济实际情况,通过GIL输电技术全寿命周期比较,总结该技术在实际应用方面的经济效益优势,更加突出了GIL输电技术在大连地区超高压输电线路入地改造上的应用价值。上述工作,充分研究了GIL输电技术与传统同相大截面并联电缆敷设线路的比较优势及实际可行性,相关研究成果能够有效应用解决大连等大中型城市在面对城市超高压、特高压架空线路入地改造方面遇到的现实生产与技术瓶颈,为大连地区特高压架空线入地改造可以提供有价值的参考。

  关键词:超高压;GIL;同相大截面并联电缆;载流量;全寿命周期。

  Abstract

  With? the? rapid? development? of? China's? economy? and? the? accelerated? process? ofurbanization,? the? urban? land? resources? are? becoming? more? and? more? precious.? Thetransformation? of? the? overhead? lines? to? the? land? and? the? reduction? of? the? occupancy? of? landresources? have? become? the? trend? of? the? times.? There? are? still? many? 500k V? and? above? UHVand? UHV? overhead? lines? in? the? core? areas? of? large? and? medium-sized? cities,? such? as? Dalianand? many? other? large? and? medium-sized? cities,? and? the? transformation? of? UHP? and? UHVoverhead lines into the ground is a new research topic in the field of electric power because ofits difficulty and high technical requirement.

  In the practical application of electric power cable technology, the cable line laying andoperation? are? basically? in? phase? single? cable,? and? the? largest? cross? section? product? producedby the manufacturer is 3000 mm2 section cable, the same phase single cable is limited by theproduction? technology? and? other? aspects,? its? carrying? capacity? can? not? be? satisfied? andsupports the ultra high pressure. The transmission capacity of UHV line is required. In orderto? solve? the? problem? that? the? transmission? capacity? of? the? cable? line? is? not? matched? with? thetransmission? capacity? of? ultra? high? voltage? and? UHV? transmission? lines,? the? technology? ofparallel large section parallel cable can be used in theory, that is, to increase the transmissioncapacity? of? the? cable? by? the? way? of? 2? or? more cables? in? parallel.? But? in? fact,? there? are? manydisadvantages? in? the? same? phase? and? large? section? parallel? cable,? such? as? the? difficulties? inconstruction? technology,? the? high? requirements? for? cable? layout,? and? so? on,? and? there? is? nopractical? application.? In? comparison,? GIL? (gas? insulated? metal? closed)? transmissiontechnology? has? the? advantages? of? large? transmission? capacity,? modular? function,? highefficiency, safe and reliable, high environmental protection, flexible laying and so on. It canreplace the same phase large section parallel cable technology in cable laying, so as to meetthe? transmission? capacity? requirements? for? UHV? and? UHV? transmission? lines.? .? At? present,the? 500k V? ultra? high? voltage? overhead? transmission? lines? in? Dalian? are? generally? aging,? andthe reconstruction of overhead lines is in contradiction with the urban planning. The existingurban land resources can not support the reconstruction of the existing overhead lines in space.

  At? present,? there? is? no? experience? in? the? construction? and? operation? of? the? GIL? transmissionline in Dalian, and the design, construction and reliability of the GIL transmission technologyare still to be demonstrated, and the technical and economic benefits are still to be analyzed.

  In? this? paper,? by? comparing? the? advantages? of? GIL? transmission? technology? with? theparallel large section parallel cable from the load balance, safety, reliability and service life, itis? proved? that? the? GIL? transmission? technology? is? necessary? to? replace? the? parallel? largesection parallel cable technology. Secondly, it is clear that the GIL transmission technology issuperior? to? the? cable? in? the? capacity? of? carrying? capacity.? On? the? basis? of? technology,? thetechnical? features,? structure? organization,? reliability? analysis? and? environmental? analysis? ofGIL transmission technology are fully studied. Again, taking the 500k V transmission line inDalian as an example, combined with the actual situation of the UHP overhead circuit in theDalian? area,? the? application? of? the? EHV? transmission? line? in? Dalian? area? is? applied.? Thefeasibility? study? of? GIL? transmission? technology? is? carried? out? and? the? design? scheme? is? putforward.? Finally,? according? to? the? actual? situation? of? Dalian? local? economy,? through? thecomparison of the whole life cycle of the GIL transmission technology, the economic benefitadvantage of the technology in practical application is summarized, and the ultra high voltagetransmission? line? of? the? GIL? transmission? technology? in? Dalian? area? is? more? prominent.? Theapplication value of the road to land transformation.

  The above work has fully studied the comparative advantages and practical feasibility ofthe GIL transmission technology and the traditional parallel large section parallel cable layingidea. The related research results can be applied effectively to solve the practical productionand? technical? bottlenecks? of? Dalian? and? other? large? and? medium-sized? cities? in? the? face? ofurban? UHP? and? UHV? overhead? transmission? lines.? For? reference,? the? Dalian? area? of? UHVoverhead line into the transformation can provide valuable.

  Key Words:ultrahigh voltage; GIL; parallel large cross section parallel cable; flow rate;life cycle comparison。

  目录

  摘要
  1绪论
  1.1城市电网发展带来的挑战
  1.2?? GIL在城市电网中的发展现状及存在的问题
  1.2.1?? GIL输电技术简介
  1.2.2发展现状
  1.2.3存在的问题
  1.3本文主要研究工作
  2 GIL输电技术
  2.1概述
  2.2?? GIL的结构组织形式
  2.2.1?? GIL结构
  2.2.2?? GIL系统构成
  2.2.3?? GIL的主要特点
  2.2.4?? GIL的敷设方式
  2.2.5?? GIL绝缘介质的选择
  2.2.6?? GIL系统的气体监控
  2.2.7?? GIL的电弧定位
  2.2.8?? GIL线路SF6气体的安全管理措施
  2.2.9?? GIL绝缘介质的回收处理方案
  2.3?? GIL的可靠性分析
  2.4?? GIL的安全性及环境影响
  2.4.1?? GIL构造有利于安全保护
  2.4.2?? GIL对环境的影响
  2.4.3?? GIL的运行情况
  2.5?? GIL输电技术与同相大截面并联电缆的比较
  2.5.1同相大截面并联电缆
  2.5.2技术比较
  2.6本章小结
  3大连500k V架空线路入地改造
  3.1?? 大连地区电网现状
  3.2?? 线路路径及政策分析
  3.3?? 500k V 线路改造的技术要求
  3.4?? GIL 线路路径选择
  3.5?? GIL 进线及敷设方式
  3.5.1?? GIL 方案进线方式
  3.5.2?? 敷设方式
  3.6?? GIL 隧道技术方案
  3.6.1?? 隧道结构设计主要原则
  3.6.2?? 电缆通道技术方案选用
  3.7?? 500k V 线路电缆方案与 GIL 方案的综合比较
  3.8?? 本章小结
  4?? GIL 技术与同相大截面并联电缆的全寿命周期比较
  4.1?? 全寿命周期
  4.2?? 工程规模
  4.3?? 全寿命周期成本比较
  4.4?? 本章小结
  结? 论
  参考文献

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