河南机电高等专科学校毕业设计/论文I摘要根据设计任务书的要求,本次设计为110kV变电站电气一次部分初步设计,并绘制电气主接线图及其他图纸。该变电站设有两台主变压器,站内主接线分为110kV、35kV和10kV三个电压等级。各个电压等级分别采用单母线分段接线、单母线分段接线和单母线分段接线。本次设计中进行了电气主接线的设计、短路电流计算、主要电气设备选择及校验(包括断路器、隔离开关、电流互感器、电压互感器、母线等)、各电压等级配电装置设计、直流系统设计以及防雷保护的配置。关键词:变电站设计防雷保护ABSTRACTFromtheguideofengineeringdesignassignment,wehavetodesignprimarypower-systemof110kVsubstationanddrawmainelectricalone-linediagramandothers.Therearetwomaintransformerinthesubstationinwhichmainelectricalconnectioncanbedividedintothreevoltagegrades:110kV,35kVwith10kV.Itdepositssectionalizedsinglebusbarscheme,sectionalizedsingleandsectionalizedsinglebusbarschemepergrade.Thereisalsoadesignformainelectricalconnectioninthisngineering,thecalculationforshort-circuitelectriccurrent,theselectionofelectricaldeviceandcalibration(includingcircuitbreaker,isolator,current,transformer,potentialtransformer,busbaretc.)andthedesignfordistributioninstallationper.voltagegrade,directcurrentsystemandlightningprotectionisalsoincluded.KeyWords:substationdesignlightningprotection河南机电高等专科学校毕业设计/论文II目录绪论..................................................................................................................................1第1章变电站总体分析..............................................................................................21.1变电站总体分析....................................................................................................2第2章负荷分析计算与主变压器的选择...................................................................42.1负荷分析计算...........................................................................................................42.2主变选择...................................................................................................................62.3无功补偿..................................................................................................................8第3章电气主接线设计................................................................错误!未定义书签。3.1主接线的设计原则和要求.....................................................................................113.2主接线的设计步骤...................................................................错误!未定义书签。3.3电气主接线设计......................................................................错误!未定义书签。第4章短路电流计算及电气设备选择.......................................错误!未定义书签。4.1短路电流的危害......................................................................错误!未定义书签。4.2电气设备选择...........................................................................错误!未定义书签。4.3高压断路器的选择.................................................................................................184.4隔离开关的选择.....................................................................................................194.5电压互感器选择.....................................................................................................194.6电流互感器选择.....................................................................................................204.7绝缘子和穿墙套管...................................................................错误!未定义书签。4.8电气设备表...............................................................................错误!未定义书签。第5章配电装置及电气总平面布置设计...................................错误!未定义书签。5.1概述..........................................................................................错误!未定义书签。5.2配电装置的确定......................................................................错误!未定义书签。5.3电气总平面布置..................................................................................................................25第6章防雷保护设计................................................................................................276.1变电站的防雷保护特点.........................................................................................276.2变电站直击雷防护...............................................................................................................276.3侵入波过电压防护.................................................................................................27第7章避雷针保护范围的计算方法........................................................................28第8章展望………………………………………………………………….…….29致谢................................................................................................................................30参考文献...........................................................................................错误!未定义书签。河南机电高等专科学校毕业设计/论文III附录Ⅰ短路电流的计算.................................................................错误!未定义书签。附录Ⅱ电气设备的选择..............................................................................................38附录Ⅲ避雷针保护范围计算..................................................................................................58河南机电高等专科学校毕业设计/论文1绪论本文首先根据任务书上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以及站用电的主接线,然后又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,同时也确定了站用变压器的容量及型号;最后,根据最大持续工作电流及短路计算的计算结果,对高压熔断器、隔离开关、母线、绝缘子和穿墙套管、电压互感器、电流互感器进行了选型,从而完成了110kV电气一次部分的设计。按照先行的原则,依据远期负荷发展,决定在本区兴建一所中型110kV变电站。本设计属中间变电站该变电所建成后,,它的主要任务是把110KV变成35kV和10kV电压供周边城乡使用。WH市郊110kV变电站是地区性城市变电站,它由系统1和系统2供电,同较为紧密,在整个系统