大工毕业论文110kv变电站电气部分设计

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网络教育学院本科生毕业论文(设计)题目:110kv变电站电气部分设计学习中心:层次:专科起点本科专业:电气工程及其自动化年级:年春季学号:学生:指导教师:完成日期:年月日110kv变电站电气部分设计I内容摘要电力工业是国民经济建设的基础工业,与人民生活息息相关,随着经济的发展和人民生活水平的提高,社会对电网供电可靠性、电压合格率等要求越来越高。变电站作为当地的工农业生产、生活供电基地,其设计的合理性将直接影响到当地的经济发展。本变电站根据所处地理位置、周边经济、生活、农业用电情况,结合本区域电力公司电网发展规划等因素进行设计。首先通过负荷计算及供电范围确定了主变压器台数,容量及型号。其次,根据设计任务要求,假定所给系统与线路及所有负荷的参数,分析负荷发展趋势。从负荷增长方面阐明了建站的必要性,然后通过对拟建变电站的概括以及出线方向来考虑,并通过对负荷资料的分析,安全,经济及可靠性方面考虑,确定了110kV,35kV,10kV用电的主接线方案。最后,根据最大持续工作电流及短路计算的计算结果,对高压断路器、隔离开关、母线、电压互感器、电流互感器等进行了选型,从而完成了110kV电气一次部分的设计。关键词:变电所;变压器;主接线;负荷;短路电流110KV变电站电气部分设计II目录内容摘要·····························································································I1绪论·······························································································11.1110KV变电站的发展现状与趋势···················································11.2110kV变电所的研究背景····························································11.3本次论文的主要工作·································································12变电站电气设计的主要内容·································································32.1变电所的总体分析及主变选择·····················································32.2电气主接线的选择····································································32.3短路电流计算··········································································32.4主要电气设备和载流导体的选择··················································32.5各级电压配电装置布置······························································42.6所用电及直流系统····································································42.7防雷接地················································································42.8主变保护的配置·······································································43变电站的总体分析及主变选择·····························································53.1变电站的总体情况分析······························································53.2主变压器容量的选择·································································63.3主变压器台数的选择·································································84电气主接线设计················································································94.1引言·······················································································94.2电气主接线设计的原则和基本要求···············································94.3电气主接线设计说明·································································95短路电流计算·················································································135.1短路计算的目的······································································135.2变电站短路电流计算································································136主要电气设备和载流导体的选择·························································146.1母线的选择············································································146.2断路器的选择与校验································································14110KV变电站电气部分设计III6.3隔离开关的选择与校验·····························································156.4互感器的选择·········································································167各级电压配电装置布置·····································································198所用电及直流系统···········································································208.1所用电源引线·········································································208.2直流系统···············································································209防雷接地·······················································································219.1防雷保护···············································································219.2避雷针的选择配置···································································219.3避雷器的选择配置···································································2110主变保护的配置·············································································2311结论····························································································24参考文献····························································································26附录1主要电气设备汇总表(附表)····················································27附录2110KV变电站一次接线图(附图)·············································28110KV变电站电气部分设计11绪论1.1110KV变电站的发展现状与趋势随着我国小城市和西部地区经济的不断发展,对电能资源的要求也越来越高,西部主要是高原地带,在高海拔的条件下,农村现有的变电技术远达不到经济的快速发展,这也在一定程度上影响了西部地区和中小城市变电技术的推广和应用技术的深化。因此,一方面需要创造条件有针对性地提高对小城市以及农村的变电站的建设,加强专业知识的培训来提高变电技术;另一方面,可以以此为媒介积极开展技术交流,通过实践去体验、探索。当今世界各方面因素正冲击着全球电力工业,在国外变电所技术有十分剧烈的竞争,而世界范围内的变电所都采用了新技术;其次,不同的环境要求给所有的电力供应商增加了额外的责任,使电力自动化设备尤其是高压大功率变电站的市场开发空间大大拓展。另外高压变电所的最终用户对变电站的自动控制、节能、环保意识越来越强烈,迫使其上游提供者尤其是系统集成商更加重视地区性电能分配技术方面的需要,所以变电所在世界上飞速的发展,从而要求我国变电技术上也要加入世界先进的变电技术行业。1.2110kV变电所的研究背景110kV变电所是电力配送的重要环节,也是电网建设的关键环节。变电所设计质量的好坏,直接关系到电力系统的安全、稳定、灵活和经济运行,为满足城镇负荷日益增长的需要,提高对用户供电的可靠性和电能质量。随着国民经济的发展,工农业生产的增长需要,迫切要求增长供电容量,拟新建110kV变电所。变电站是电力系统的重要组成部分,它直接影响整个电力系统的安全与经济运行,是联系发电厂和用户的中间环节,起着变换和分配电能的作用。电气主接线是发电厂变电所的主要环节,电气主接线的拟定直接关系着全所电气设备的选择、配电装置的布置、继电保护和自动装置的确定,是变电站电气部分投资大小的决定性因素。随着变电所综合自动化技术的不断发展与进步,变电站综合自动化系统取代或更新传统的变电所二次系统,继而实现“无人值班”变电所已成为电力系统新的发展方向和趋势。1.3本次论文的主要工作本次论文主要研究110kv变电站的一次部分的电气设计,着重对以下方面进行110KV变电站电气部分设计2详细研究。①主变压器选择:包括台数、容量、型式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