毕业设计

本科生毕业设计（论文）I摘要本设计为建平变电所电气部分的设计（110kV/10kV）。本次设计的变电所是在当前建平县概况的前提下进行的，设计负荷充分的考虑到建平地区的工业及非工业情况，明确在变电所所有供电负荷中，哪些是一级负荷，哪些是二、三级负荷，并对相应的负荷采取不同的供电措施,以保证供电质量和供电的可靠性。因本次设计的110KV变电所属于高压网络，该地区变电站所涉及方面多，考虑问题也多，在分析变电所担负的任务及用户负荷等情况下，慎重的进行选择所址。充分利用用户数据进行负荷的统计和计算，确定对进行用户无功功率补偿装置，同时进行变电所主变压器的选择，使变电所在能满足当前供电负荷的情况下，同时能满足未来5-10年该地区的供电负荷。考虑安全、可靠、灵活和经济，确定变电所的电气主接线的接线方式。再进行短路电流计算，以便选择设计变电所的高低压电气设备和导线，同时对它们进行校验。本变电站的初步设计包括了：（1）总体方案的确定（2）负荷计算（3）主变压器的选择（4）电气主接线的确定（5）高低压配电系统设计（6）继电保护（7）防雷与接地保护等内容。随着电力技术高新化、复杂化的迅速发展，电力系统在从发电到供电的所有领域中，通过新技术的使用，都在不断的发生变化。变电站作为电力系统中一个关键的环节也同样在新的技术领域得到了充分的发展。关键词：变电站；负荷；主变压器；电气主接线；高低压电气设备本科生毕业设计（论文）IIAbstractThisdesignisapartofJianpingelectricalsubstationsexcogitation(110kV/10kV).ThesubstationwasdesignedonthebasisofJianpingelectricalpowersituation,thinkovertheindustryandnon-industrialofJianpingdistricttodesign,accordingtothinkingaboutwhatisthefirstclassload,thesecondclassloadandthethirdclassloadexplicitabouttheloadofthesubstationinJianping.Usingthedifferentmeasuresinlinewiththerelevanttheloadsituationtoensurethequalityofpowersupplyandservicereliabilityofcustomers.Becauseofthisdesignarehigh-voltagenetwork110KVsubstation,substationintheareainmoreinvolved,considertheproblemmore,substationintheanalysistasksanduserloadsuchcircumstances,carefultochoosethesite.Makefulluseofuserdataforstatisticalandcomputingload,determineforreactivepowercompensationdeviceusers,atthesametimethechoiceofmaintransformersubstation,tomeetthecurrentelectricitysubstationinthecaseofload,atthesametimethenext5-10yearstomeettheregion'selectricityload.Considersafety,reliability,flexibilityandeconomy,todeterminetheelectricalsubstationmainconnectionofwiring.Furthershort-circuitcurrentcalculation,inordertochoosethedesignofhighvoltageelectricalsubstationequipmentandwires,checkthematthesametime.Thepreliminarydesignofthesubstationincluding:(1)theoverallschemedetermined(2)loadcalculation(3)thechoiceofmaintransformer(4)DeterminationofMainElectricalWiring(5)Highandlowvoltagepowerdistributionsystemdesign(6)lightningprotectionandgrounding(7)Lightningprotectionandgrounding.Keywords：transformersubstation;load;transformer;mainelectricalconnection;highandlowvoltageelectricalequipment本科生毕业设计（论文）III目录第1章绪论..........................................................................................................11.1概述...........................................................................................................11.2课题来源及设计背景...............................................................................2第2章变电站负荷计算和无功补偿计算............................................................42.1变电站的负荷计算...................................................................................42.2变电站无功补偿计算...............................................................................7第3章主变压器台数和容量的选择....................................................................93.1变压器选择原则.......................................................................................93.2主变压器台数的选择...............................................................................9第4章电气主接线的确定..................................................................................114.1主接线方案比较.....................................................................................114.2电气主接线设计方案.............................................................................12第5章短路计算..................................................................................................165.1短路电流的概述.....................................................................................165.2计算短路电流的目的.............................................................................165.3短路电流计算的步骤.............................................................................18第6章电气设备的选择与校验..........................................................................236.1电气设备选择和校验的原则.................................................................236.2高压断路器的选择.................................................................................246.2.1110kV电压级断路器....................................................................246.2.210kV电压级断路器......................................................................256.3隔离开关的选择.....................................................................................276.3.1110kV侧隔离开关的选择............................................................276.3.210kV侧隔离开关的选择..............................................................286.4互感器的选择.........................................................................................296.4.1电流互感器的选择......................................................................296.4.2电压互感器的选择......................................................................316.5母线的选择.............................................................................................326.6各电气设备选择结果表.........................................................................33第7章主变压器的继电保护设计......................................................................34本科生毕业设计（论文）IV7.1继电保护的目的........................