长春工业大学学士学位论文PAGEII摘要变电所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。本文设计的是66/10kV降压变电所的电气部分。是为了保证供电的可靠性、安全性以及满足远期负荷需要的要求，按照远期负荷规划进行初步设计，达到能够保证变电所长期可靠供电的目的。设计内容包括变电所的负荷计算、变电所主接线设计、短路计算、变压器的继电保护设计、防雷设计等。根据负荷计算，确定主变的型号及台数。选定容量10000kVA，两台并列运行；通过对主接线预选方案的经济和技术比较，确定主接线的接线方式；短路计算时先将其改为标幺值再计算其短路电流；变压器的继电保护根据变压器的容量，确定继电保护的保护种类和方式，过流保护保护和差动保护为变压器的主保护，瓦斯保护作为其后备保护；防雷设计根据变电所的大小确定避雷针的个数和高度。本文设计是针对生产实践，通过分析、计算、比较和论证等设计步骤完成了变电所电气部分设计，能够满足变电所稳定安全供电的要求。关键词：变电所，主接线，短路计算，继电保护66kVStep-downTransformerSubstationDesignAbstractTransformersubstationistheconnectionofpowerplantsandusers,playingaroleoftransforminganddistributingelectricenergy.Thisarticledesignedthesubstationis66/11KVSubstationelectricalpartdesign.Forthesakeofdependablethatguaranteethepowersupplywitharequestthatcontentedlong-termburthen,carriesaccordingtotheforwardtheprogrammingproceedingdesigndevelopments,frombutguaranteetochangetogiveorgetanelectricshockcanlong-termdependablepowersupply.Designisthemaincontentsofthesubstationload,short-circuit,thewiringdesignofthemainsubstation,Transformerrelaydesign,minedesign.Thedesignforthemajorpartoftheelectricalsubstationdesign,completepowersubstationsecurityandstability.Substationknownunderconditionsoftheload,todeterminethemaintransformerandtheModelNumber.Capacityof10,000KVAselected,twoparalleloperation;Throughthemainwiringprimariesprogramofeconomicandtechnicalaspectsofdeterminingthemainwiringconnection;short-circuitthecalculationofitsfirst11tosubscriptcalculatethevalueofitsshort-circuitcurrent;Accordingtothetransformerrelaytransformercapacity,overcurrentprotectionandformsandgasdifferentialprotectionandtheprotectionofthemaintransformerprotection,theprotectionrelaydeterminethetypesasitsbackupprotection;minedesignbasedonthesizeofsubstationstodeterminethenumberoflightningandhighThisarticleismainlyforthepractice,morecalculating,thenumericalcalculationtomeettheelectricitysubstationstabilizationofthesecurityrequirementsKeywords：TransformerSubstation;MainWiring;Short-circuitCalculation