CONFERENCE PROCEEDINGS

^^^M^^HB/TIB Hannover

VOLUME 2

DIELECTRICS AND

INSULATION

J Tabl e of Contents

DIELECTRICS AND INSULATION

Influence of Voltage Shape on Electrification of an Insulating Plate Due toSurface Discharge in SFe

Osamu Yamamoto, Masu Takuma, Takehisa Ma, K. Yasui, S. FujinoA Study on Breakdown Characteristics of Hybrid Gas Insulated TransmissionLine (H-GIL)

Masafumi Yashima, Tadashi Kawamoto, Hideo Fujinami, Tadasu Takuma

High Voltage Performance of a Gas Insulated Cable with Uz and Nz/SFs Mixtures 9Harold I. Marsden, S.J. Bale, M.B. Hopkins, C.R. Eck III

Discussion of an Approach Based on an Energy Model for Assessment of

Particles in GIS Based on Their Acoustic Signature 13

Lars E. Lundgaard, R.S, SigmondCorona Stabilisation and Prebreakdown Development in SFs for InhomogeneousFields Stressed with Very Fast Transient Voltages 19

Christoph lender, D. Schoen, Wolfgang Pfeiffer

The Influence of Partial Discharges on Aging of Epoxy Resin under DC Stress 23

Udo Fromm

Influence of Thermal Aging on the Properties of Cross-linked Polyethylene Used

as Electrical Insulation of Medium Voltage Cables 27

Ahmed Boutakeur, Abdallah Uedjdoub, Mahmoud Boumenoug

High Field Conductivity of Polyethylene 31

Steun Boggs, Grace Ge Jiang

Thermal Bubble-triggered Breakdown of a Plane-to-cylinder Electrode PartiallyCovered with Thin Insulation Film in Liquid Nitrogen 35

Koji lakano, Sknsuke Matsuura, Jiang Yan, MasanoriHara

Evaluation of Insulation Performance of Liquid Helium under Quench Environmentfor Superconducting Power Apparatus 39

Hitoshi Okubo, Shunji Cbigusa, Yoichiro Taniguchi, Haoki HapkanaEffect of Carbon Particles on the Flashover Behaviour of a Solid/Liquid Interface

in a Non-uniform Field 43

Matthias Krins, Hossein Borsi, Ernst Gockenbach

Insulation Characteristics of Vacuum Gaps Between Electro-grade GraphiteElectrodes after Pulsed Electron Beam Surface Modification 47

Sergey A. Korener

Proposal on Test Methods for Measuring Breakdown Strength of CompositeInsulating Materials 51

Kenji Ichikawa, Tatsuo Motoyama, Michio Tan, Kenzo Kadotani

Behavior of Surface Discharges along a Polymer Foam Insulator in Air 55

Udo Fromm, Li Ming, Mats Leijon, Dan Wmdmar

Modeling Pulse Propagation in High Voltage Machines 57

J. Leonardo Guardado, V. Venegas, E. Melgoia, Jose' Luis Haredo

Anomalous Dielectric Dispersion in Laminated Dielectrics 61

Olga S. Gelle, Sergei M. Lebedet

Service Life of Pulsed Capacitors Operated under Increased Gradients of

65Electrical Field OBnm Hannover

mj v. Rudakov mmm

Tracking Degradation of Silicone Rubber

Nobuhiro Fujioka, Sadahiko Ohgaki

89

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Effect of Normal Hexane Treatment on DC Treeing Breakdown and Space ChargeFormation in Linear LDPE 73

Hideaki Kawamura, Masahito Namla

Partial Discharge Behaviour during Electrical Treeing in Polyethylene with Barriers 79Gerhard Salge

Polymer Insulation Field Aging and Its Service Life 83

Vasily Y. Ushakor, U. Skvizskaya, B.l Shmakov

Characterization of Moving Particles in GIS by Acoustic and Electrical Partial

Discharge Detection 87Hans-Dieter Schlemper, Kurt Feser

Evaluation of Non-standard Lightning Surge Waveforms in GIS 91

Shigemitsu Okabe, Masanori Koto

Insulation Characteristics of GIS for Non-standard Lightning Surge Waveforms 97Mio Yamagiwa, Shigemitsu Okabe, Masanori Koto, Tosfiio Ishikawa

Particle-initiated Surface Discharges in SFs under Fast Oscillating ImpulseVoltages 101

Stefan Tenbofilen

N2-SF6 Mixtures for High Voltage Gas Insulated Lines 105M. Guillen, Tieco B. Diarra, Abderrahmane Beroual, Francois Buret, E. Thuries, Philippe Roussel

Breakdown Characteristics of Polyethylene Insulations Under DC Voltage and withSuperimposed Impulse Voltage 109

Uwe Riechert, Martin Eberhardt, Jose! Kindersberger, Joachim SpeckPartial Discharges in Various Voids in XLPE 113

Atsushi Top, Yoshitsugu Sudo

Feasibility Study of Extruded Polymer Insulated DC Superconducting Cable 117Masamitsu Kosaki, Atsushi Minoda, Masayuki Hagao

Thermally Accelerated Corona Ageing of Silicone Rubber Surface Insulation 121S.M. Reynders, P. Hendey, Jan Peters Reynders

Insulation of High Critical Temperature Superconducting Power Equipment withLiquid Nitrogen 125

Juergen Gerhold, Masanori Hara

Long Term Performance of GIS in Relation to the Quality of Spacers 129E. Colombo, Ulojciech Koltunowici, Alberto Pigini, G. Tronconi

Ion Diffusion in Polyethylene Films133

R. Penteado, R. Robert, I. Mondini

Prebreakdown Current in an Air Gap with Dielectric Barrier Stressed by 50 Hz Voltage 137M.A. Handala, M. Moudoud

Use of Functionally Graded Material in the Manufacture of a Variable-permitivityType Insulator, and the Effect and Electric Field Relaxation 141

Shigeo Watanabe, Yasuo Hobo, Toshihiro Ishikura, Kazuhiko Takai, Niichi Hayashi, Yoshiyuki Ucfiida, David Dykes, Girard Touchard, Masayuki leda

Propagation Characteristics of a Surface Discharge on Covered Conductors andCylindrical Dielectric Materials

145Takahiko Yamashita, Goichi Satoh, Tomoyuki Fujishima, Hisao Matsuo, Tetsuya Shibata

Pulsed Laser Trigged Discharge in a Homogeneous Electric Field 149Lan Gao, Viktor Scuka

Investigations of Pseudospark Switch with High Holdoff Voltage 153HI. Ihao, S.M. Wang, Q. Ihang, Chengmu Luo

Microwave Heating of Electric Cable Insulated Wires before Their Impregnationwith a Hydrophobic Material

157Dumitru Niculae, A. Mihailescu, D. liaianomi, D. Martin

Attenuation Measurements of Ultra High Frequency Partial Discharge Signals inGas-insulated Substations 161

Rolf Kurrer, Kurt Feser

The Effect of Conducting Particles Adhering to Spacers in Gas Insulators Switchgear 165

R. Schurer, Kurt Feser

Current Variation and NO Concentration Change for a Negative Corona Discharge in Nz 169

Motosbige Yumoto, K Hagatake, T Sakai

VPI-stator-bar Insulation with Very Low Partial Discharge Level 173

F. Kielmann, H Schbnthier, Wolfgang Golbig

Investigation of Partial Discharge Mechanism in SFe Gas by SimultaneousMeasurement of Current Waveform and Light Emission 177

Hitoshi Okubo, Masanobu Yoshida, Toshihiro Takahashi, Masayuki Hikita, Hiroyuki Watanabe, Naomi Hashimoto

Leader Step Time Measured in a Point/Plane Gap in SFe Gas Using a Photomultiplier Tube 181

Wenguo Gu, Qiaogen lhang, Yuchang Qiu

Influence of Wavefront Duration on Particle-initiated Flashover Characteristics of

Insulators in SFe 185

Qiaogen Zhang, Wenguo Gu, Yuchang Qiu

Physically Based Interpretation of Partial Discharges in Flat Cavities 189

Katrm Engel, Dirk Peter

Fundamental Ageing Mechanisms of Fibre Reinforced Polymer (FRP) Insulators 193

Carsten Schrijw, Astnd Herden, Hermann Christian Kirner

Metalclad Switchgear with Vacuum Circuit Breaker 197

Joze Pihler, Joze Vorsic, Dimitnj Kos

Conditions of Discharges from Moving Particles Between Impacts in GIS 201

Magnus Holmberg, Mose Akyuz, Siamslaw M. Gubanski

Analysis of Insulating Reliability According to Additives in Epoxy Composites usingWeibull Distribution Equation 205

C.G. Shin, G.H Park, KM Jang, K.H Kim, YP. Park, Joon-Ung Lee

Investigations of Oil-paper Insulated Current Transformers 209

Stefan Halin, I Heimams, A Kozlorskis, S.M. Gubanski

A Study of Prebreakdown Phenomena in Two Dielectric Fluids Used in All-film

Capacitor Technology: Phenylxylylethane and Mono/Dibenzyl Toluene 215

Abderrahmane Beroual, C. Brosseau

Discharge Current of Free Moving Particles in GIS 219

GOnther Wannmger

Breakdown Characteristics of Oil-polymer Film Insulation under Steep-frontImpulse Voltages 223

K.D. Srmslaia, A. John l/andermaar, May G Wang, J.B Neilson

Microdischarge Activity in Vacuum Insulating System with Cu-coated Ceramic Spacer 227

Waldemar liomek, Hanna Moscicka-Grzesiak, Edmund Kuffel

Optical Character of Partial Discharge in Transformer Oil 231

Guangnu Wang, Wenjun Ihou

The Effect of Gas Density on Corona Characteristics 235

Shmu Chen, Cixuan Chen, Guangrun Xie

Risk Assessment for Moving Particles in Gas Insulated Systems 239

Michael Yl/ohlmuth

Breakdown Characteristics of Solid Insulation under the Presence of Non-uniform

Transverse Electric Fields 243

A Nosseir, Abd-ElatiefM El-Em, K Abu-Elabbas

Influence of DC and DC/AC Superimposed Fields on the Flow Electrification

of Transformer Oil 247

Hiroshi Miyao, Y Ohue, K Yamaji, M Hatano, H Kojima, S Furukatta, M. Kadowaki, T Obata

Synergy Between SFe and Other Gases to Enhance Dielectric Strength 251M. Ihou, Jan Peter Reynders

Decomposition Products of Epoxy Castings During the Early Aging Period 255

Uwe Kaltenborn, Josef Kindersberger, Joachim Speck

Electroluminescence Due to Impulse Voltage in Unaged and Aged XLPE 259

Soli S. Bamji, Alexander I Bulinski, Y. Kammura

Effect of Crosslinking By-products on DC Polarization of Cross-linked Polyethylene 265

M. Abou-Dakka, Soli S. Bamji, Alexander I Bulinski

Changes of Surface Morphology Caused by PD in SFe Gas-insulated Systems 269

F.S. Abouzakhar, TrewR. Blackburn

Effects of Crystallization Temperature on High-field Conduction and Breakdown

on LDPE Films 273

Tatsuo Mori, C. Banmongkol, Teruyosbi Mizulani, M. Ishioka, I. Ishino

Experimental Evidence of Transformer Insulation Design Methods 277

Daniel J. Tschudi, K. Schulti, T. Prinst, W, Ashton, M. Franchek

Encapsulated Test Systems Insulated with SFe 281

M, Gamlin, Roger Gleynd, Peter Mohaupt, Gunter VoigtThe Effect of Aspect Ratio on PD Patterns in Artificial Single Channels 285

Kai Wu, Y. Suzuoki, Teruyosbi Mizulani, H.K. Xie

Impulse Breakdown in Point-Plane Gaps in SFe-Nz Mixtures 289

Xarier Waymel, V. Delmon, Thierry Reess, Pierre Domens, Alain Gibert

Optical & Electric Study of the Avalanche and Streamer Formation in Sulfurhexafluoride 293

E.H.R. Gaxiola, J.M. totzer

Study of Space Charge Behaviour in XLPE Power Cable Insulation under High Pressure 297

Se-Ondoua Mbarga, Nabila lebouchi, D. Make, The-Giam HoangPartial Discharge Degradation at EPR-Epoxy Resin Interface with Simple Foil

Electrode System 301

Hiroshi Kuno, Yasuo Suzuoki, Teruyoshi Mizulani, Katsumi Uchida

Influence of Barrier on Breakdown Characteristics of Transformer Oil under

Different Voltage Profiles 305

R. Sarathi, C. Venkataseshaiah, Vitek Krishnan

Investigations on the Gassing Characteristics of Synthetic Insulating Liquids 309

Knut Dumke, Hossein Borsi, Ernst Gockenbach

The Partial Discharge Behavior of Gas-filled Granular Porous Material 313

JBrgen Girlner, Ernst Gockenbach, Hossein Borsi

Partial Discharge Behavior of Cast Resin Coils under Stress with HighFrequency High Voltages 317

Thomas Koschnitzki, Hossein Borsi, Ernst Gockenbach

Aging of the Model Capacitors to the PP Impregnes 321

A. Gadoum, L. liii

Tank Inner Side Dielectric Coating Effect on the Particle Movement for Improvingof GIS Insulation Reliability 325

Ja-Yoon Koo, Bang Utook Lee, U.K. Kim, Ik-Soo Kim

Effect of Waveshapes on the Breakdown Voltage of Dielectric Interfaces 329

Chinh Dang

Interpretation of the Direct Breakdown Mechanism in Long Gaps in Transformer Oil 333

A*. Giao Trinh, A. Saker

The Deformation of the Gas Bubbles in the Dielectric Liquids under High Field 339

Man Gao, Yonghui lou, Fuyi Liu

Ageing of Epoxy/Polyester Mica Insulation under Radiation and Thermal Stresses 343

Yogendra D. Vashishtha, QiSu, R.C. Tychsen, AX i/erma, AX Gupta, P.B. Kulkarni

Pulse-Phase Analysis of Partial Discharge Patterns in an Oil-pressboardInsulation System

K Raja, M.H. Narayanacbar, R.S Hema

Determination of the Breakdowns in the Insulation Materials by the Kirlian PhenomenonMarian Patlik, Ladislat Peska, Boleskr Gross

Lightning Impulse Study of the Spacer with a Conducting Particle on the

Surface in Relevance to Gas Insulated SystemsB HageshmrRao, K umkanath, Motaganahalli C Siddagangappa

A Multi-stress Aging Method for Fibre Reinforced Insulation MaterialsHerbert Gram, Klaus FrShlich

Preliminary Investigations of Positive-impulse Discharges in SFeS Bhutt, Ian Robert Jandrell, JP Reynolds

Theoretical Studies on Secondary Breakdowns in a GIS

M Mohan Rao, Sarma Satyanarayana, M.S. Naidu

Thermoreactive Insulation U-t Curve of Life as a Nonlinear Regression ModelYuri D Gngorm, Nikolai V. Tsbegloi V.S. Karmanot

Charge Decay on Polymeric Barriers in SFeFlam H. t/asconcelos, Keith J Comtek

Swarm Parameters Measured in SFe and Carbon Dioxide Gas Mixtures Usingthe Time-resolved Discharge Method

Dengmmg Xiao, H. Gao, Q.X. Ihu

Experimental and Numerical Investigation of Treeing Processes in Polyethylene Insulation

Marina M. Rezinkina

Direct Measurement of Cathode and Anode Electric Field up to Electrical Breakdownin Low-Density Polyethylene Film

Masayuki Hagao, Masumi Fukuma, Masamitsu Kosaki

New 72/84 kV Vacuum Interrupter for C-GIS

Iwao Ohshima, H. Somet, H. Sasage, T. Shion, M Honma

Design Optimisation of Gas Insulated Busduct by Electrostatic ShieldingSambu Satyanarayana, R Rajaraman, Angula Bhoomaiah, K.R. Sulaiman Sheriff, D Saryanarayana