numerical_spacechg - Numerical Analysis ofPEA Signal in...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Numerical Analysis ofPEA Signal in Line-plate Electrode System MasumiFukuma,TakanobuItogaandShinjiFujikawa DepartmentofElectricalEngineering,MatsueNationalCollegeofTechnology, Nishiikuma,Matsue,690-8518,JAPAN Email:fukuma i)matsue-ctjp Abstract: Thetreeingphenomena arewellknown asa initiationprocessofelectricalbreakdown intheelectric powercables.Itisdiscussedthattheinjectedchargefrom electrode isrelatedtothegrowth ofthetree [1]. The spacechargemeasurementtechniquebythepulsedelec- troacoustic(PEA)methodiswidelyused.However,the space charge measurement inthenon-uniform electric fieldhasnotbeenrealized.Fromtheviewpoint,itiscon- sideredthatthemeasurementtechniqueofspacecharge distributionundernon-uniformelectricfieldisimportant fortheinvestigationoftheelectricalbreakdownphenom- ena.Althoughthemeasurementofthespacechargesig- nal(PEAsignal)intheneedle-plateelectrodesystemhas beencarriedout,thePEA signalcouldnotbedetectedin theneedle-plateelectrodesystem.Inordertomeasurethe spacechargedistributioninnon-uniformelectricfield,a numerical analysis model ofacoustic wave generation and propagation in a line-plate electrode system have been developed. Inthispaper, theexperimentalresults andnumericalanalysisresultsintheline-plateelectrode systemhavebeenreported. INTRODUCTION The space charge measurement technique by PEA methodiswidelyusedtoinvestigatedielectricproperties andtheelectricalbreakdownphenomena inainsulating materials[2].Thetreeingphenomenaarewellknown as ainitiationprocessofelectricalbreakdownoftheelectric power cables. It is considered that the space charge behaviorundernon-uniform electricfieldrelatestothe progressofthetree.However,ithasnotbeenclarifiedon thespacechargebehavior intheneedle-plateelectrode system. The measurement techniques ofspace charge distribution under non-uniform electric field is also important inthepracticaluse.As an electrode system which gives non-uniform electric field,there are the needle-plate and line-plate electrode systems. In line- plate electrode systems, acoustic wave signal (PEA signal) form tip of line electrode can measure in a siliconerubber sample. To determinethespacecharge distributionintheline-plateelectrodesystem,ananalysis ofacousticwavegenerationandpropagationisnecessary inthePEA method. EXPERIMENTAL PEA signalinline-plateelectrodesystem We havetriedmeasurementofthePEA signalinaneedle- plateelectrodesystem,howeverPEA signalfromthetipof needleelectrodecouldnotbedetected.Schematicdiagramof PEAsignalmeasurementsystemintheline-plateelectrodesys- temisshowninFig.1.Theacousticwaveisgeneratedinthe specimenandattheinterfacebetweenelectrodeandspeci- men due to appliedpulsevoltage inPEA method. The acousticwaveisgeneratedinthespecimenandpropagated inthelowerelectrode,andreachesthepiezoelectricdevice (sensor).Intheexperiment,asiliconerubberwasusedasa sample,thatofsizeis50mm x 50mm width,and 10mm thickness,ablade(FETHER)insertedinthesampleasaline electrodeasshowninFig.1.Thespecimenwas setonthe PEA system,andthedcvoltage,0to15kVwasappliedto...
View Full Document

This note was uploaded on 06/08/2011 for the course ELECTRICAL 124 taught by Professor Ghjk during the Spring '11 term at Institute of Technology.

Page1 / 4

numerical_spacechg - Numerical Analysis ofPEA Signal in...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online