三绕组变压器纵差动保护的设计与仿真分析研究 机械制造专业VIP免费

摘要目前国内电力工业得到良好的发展成果，特高压输电线路创建完成，超大容量发电机组也开始产生，其中跨地区电网互联时期随之到来。现在，电网系统更加复杂，综合规模稳步扩张，对电力系统稳定运作提出更加严苛的要求。在电网中作为最重要的电力系统装置之一，变压器承担了电力系统中功率调节的功能，提升变压器保护的灵敏度和可靠性尤为关键。但与其他一次性设备如母线等相比，变压器保护误动次数处于较高水平。随着智能电站项目内开始使用电子变压器，我们也开始寻找到全新分析角度。尤其是为此领域纵差保护的研究提出了一个新的方向。关键词：三绕组；变压器；继电SummaryWiththedevelopmentandprogressofelectricpowerinourcountry,thecontinuousconstructionofUHVtransmissionlines,theincreaseofsuper-capacityunits,theeraofinterconnectionbetweenregionshasbeengraduallyrealized,andthecomplexityofpowergridisgraduallydeepening.Andthescaleexpandsunceasingly,putforwardthenewrequesttothesafeoperationoftheelectricpowersystem.Asoneofthemostimportantelectricalequipmentinpowersystem,transformeriscarryingtheroleofpowerporterinthepowernetwork,soitisveryimportanttoimprovethesensitivityandreliabilityoftransformerprotection.However,comparedwithotherdisposableequipmentsuchasbusbar,thestatisticsofmisoperationtimesoftransformerprotectionhasalwaysbeenatarelativelyhighlevel,andwiththegradualuseofelectronictransformersinintelligentpowerplantprojects,Thisbringsanewresearchideatotransformerprotection,especiallytheresearchdirectionoftransformerlongitudinaldifferentialprotection.Keywords:threewindings;Transformer;Relay目录摘要.................................................................11变压器保护Θ........................................................51.1励磁涌流.....................................................72继电保护装置原理...................................................92.1纵差动保护...................................................92.2变压器瓦斯保护...............................................92.3平行双回线路横联方向差动保护................................102.4复合电压启动的过电流........................................102.5变压器中性点直接接地零序电流保护工作原理....................102.6过电流保护的构成及工作原理..................................123短路电流计算......................................................133.1基本参数....................................................133.2画出短路等值电路..............................................143.3短路电流计算的过程............................................153.4保护装置的配置................................................164各保护装置的整定计算..............................................174.1纵差保护的整定计算............................................174.2110kV侧复合电压启动过电流保护整定计算........................194.338.5kV侧方向过流保护........................................204.4110kV零序过电流保护.........................................204.5变压器气体保护的整定........................................205差动元件基本原理..................................................215.1差动元件的动作方程...........................................215.2差动电流及制动电流的取得.....................................225.3电流互感器二次接线进行相位补偿（外转角）.....................235．4用保护内部算法进行相位补偿（内转角）........................245.5CT二次断线...................................................265.6逻辑构成框图.................................................2...