大型发电厂继电保护(毕业设计)

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1、摘要随着电力工业的迅速发展，我国发电机、变压器单机容量不断增大，电力系统正朝着“大机组、超高压、大电网”的方向发展。现今我国大容量发电厂不断增多，它们在电力系统中地位更显重要。为保证整个电力系统的安全经济运行，我们应对电厂配置可靠性、灵敏性、选择性和速动性都很好的保护装置。为实现配置方案的优化，还应充分考虑到大型发电厂的特点。本设计主要对大型发电厂的继电保护配置方案进行了研究。首先，对大容量机组的特点及其保护配置的基本原则进行了阐述。接着，叙述了大型发电厂中母线保护的配置原则，并提出了提高母线保护性能的一些措施。由于当前电厂厂用电系统继电保护的整定计算无规程、导则可用，本设计结合以往的一些

2、工程实践和电厂厂用电设计规定，对厂用电系统保护的配置和整定原则进行了整理，并着重研究了低压厂用电系统保护的有关配合问题。最后，本设计根据厂用电系统的保护配置原则，针对一个实际厂用电系统进行了保护配置方案的设计，包括高厂变、6kV工作段母线、低压厂用变压器以及PC母线所接开关。关键词继电保护发电机变压器组母线厂用电系统65AbstractAlongwiththequickdevelopmentofelectricpowerindustry,thesinglemachinecapacityofthegenerator,transformerinourcountrycontinuouslyenl

3、argesandtheelectricpowersystemisdevelopingtowardthedirectionof"largegeneratingset,extrahighvoltage,largepowergrid".Thebigcapacitypowerplantinourcountrycontinuouslyincreasesatpresent,theyareplayingamoreimportantroleintheelectricpowersystem.Toensurethewholeelectricpowersystemoperatingsafelyandeconom

4、ically,weshouldcollocatethepowerplanttheprotectiondeviceswhichwithmoregoodcredibility,intelligent,selectivityandspeed.Tomaketheschemeachieveoptimization,weshouldalsowellinconsiderationofthecharacteristicsoflargepowerplant.Thisdesignmainlyresearchesontheprotectionschemeinlargepowerplant.First,thear

5、ticleelaboratesthecharacteristicsofthelargecapacitygeneratingsetandthebasicprincipleofitsprotectionallocation.Thenitdescribestheprincipleofthebusbarprotectionallocationinlargepowerplant,andintroducessomemeasurestoraisethepropertyofthebusbarprotection.Becausetheprotectionofstationservicesystematpre

6、senthasnoregulationsandleadstouse,thirdly,thistextcombinesalittlebitformerengineeringfulfillmentandthedesignprovisionsofstationservicesystem,summarizingtheprinciplesofprotectionallocationandsettinginstationservicesystem,andemphaticallydiscussingthepointswhicharerelevanttotheprotectionmatchinginlow

7、-voltagestationservicesystem.Intheend,accordingtotheprincipleofthestationservicesystemprotectionallocation,thispaperdesignsaprotectionschemetoarealstationservicesystem.Keywordsrelayprotectiongeneratortransformeru