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ID:32384903
大小:1.46 MB
页数:8页
时间:2019-02-04
《悬垂线夹内导线断股的超声导波检测方法仿真研究》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、2018第46卷第7期Vol.46No.7GridAnalysis&Study电网分析与研究悬垂线夹内导线断股的超声导波检测方法仿真研究1222211孟晓波,陈文灿,杨代铭,梅红伟,王黎明,廖永力,李锐海(1.南方电网科学研究院有限责任公司,广东广州510663;2.清华大学深圳研究生院,深圳518055)摘要:输电导线断股是电力系统中比较常见的安全隐患。为了实现线夹内断股导线的快速无损检测,提出了利用超声导波检测输电导线方法,并利用有限元仿真软件ANSYS对此进行了仿真研究。首先确定检测导波的模态和频率,接着分别对线夹外及线夹内导线断股情况进行研究。仿真结果表明,对于线
2、夹外的缺陷,L(0,1)模态和T(0,1)模态的导波能够检测出来,利用反射系数和透射系数可以分辨出缺陷的大小;对于线夹内的缺陷,T(0,1)模态导波对此并不敏感,L(0,1)模态导波检测到的缺陷回波叠加在线夹端面发射波上难以识别。分析了导波能检测到的相邻2个缺陷或者截面变化之间的最小距离。由于导线夹的长度小于该最小距离,缺陷回波必然会叠加在端面回波而导致难以识别出来,因此超声导波检测在工程上难以检测线夹内部导线缺陷。关键词:导线断股;导线夹;超声导波;有限元仿真中图分类号:TM755;TB553文献标志码:A文章编号:2096-4145(2018)07-0067-08Si
3、mulationofUltrasonicGuidedWavesDetectingWireBreakageInsideSuspensionClamp1222MENGXiaobo,CHENWencan,YANGDaiming,MEIHongwei,211WANGLiming,LIAOYongli,LIRuihai(1.CSGElectricPowerResearchInstitute,Guangzhou510663,China;2.GraduateSchoolatShenzhen,TsinghuaUniversity,Shenzhen518055,China)Abstract
4、:Transmissionwirebreakageisthecommonsecurityrisksinpowersystem.Inordertorealizethefastnon-destructivetestingofstrandedwireintheclamp,amethodofdetectingthetransmissionwirebyultrasonicguidedwaveisputforward,andthefiniteelementsimulationsoftwareANSYSisusedtosimulatethetransmissionwire.Firstl
5、y,themodalandfrequencyoftheguidedwavearedetermined,andthenthesimulationofthewirebreakageinthewireclampandoutsidethewireclampiscarriedout.ThesimulationresultsshowthattheL(0,1)andtheT(0,1)guidedwavecanbedetectedforthedefectsoutsidetheclamp,andthesizeofthedefectcanbedistinguishedbythereflect
6、ioncoefficientandthetransmissioncoefficient.T(0,1)guidedwavesarenotsensitivetothedefectsintheclamp,andthedefectechoesdetectedbyL(0,1)guidedwavesaredifficulttoidentifyfromthewaveoftheedgeoftheclamp.Theminimumdistancebetweenadjacenttwodefectsorcrosssectionchangesisanalyzed.Asthelengthofthew
7、ireclampislessthanthisminimumdistance,thedefectechoisboundtobesuperimposedontheedgeechoanditisdifficulttoidentifyit.Therefore,itisdifficultfortheultrasonicwavedetectiontodetectthewiredefectinsidetheclampinengineeringpractice.Keywords:transmissionwirebreakage;suspens
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