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The effects of high electric fields on an Epoxy resin

By Virginie Griseri


The aim of this work was to determine some of the effects caused by the application of a high electric field on a filler-free epoxy resin material.\ud Two types of sample geometry were moulded. Films (55 to 300μm) were prepared to work under uniform field configurations. A frame of parallel wires (5 to 25μm radius) was introduced into the bulk to work under divergent fields.\ud Three non-destructive complementary methods of investigation were used. In all cases the first measurements were performed before the application of thermal-electric stress to define the properties of the material itself. Measurements were repeated after a controlled period of stress. Dielectric spectroscopy measurements were used to determine the main relaxation processes. To evaluate the impact of charge injection and localise the build up of space charge, the pulsed-electro acoustic method was chosen. Luminescence experiments were carried out to investigate the luminescence excitation parameters and pathway of radiative relaxation that are found to be directly linked with the charge injection and extraction phenomena. In addition spectral analysis was performed to complete the investigation. Light emission is associated with relaxations dependent on the chromophores that are present and that are likely to be affected by an external stress.\ud After thermal-electric stress one relaxation processes was detected by dielectric spectroscopy that was dependent on the stress. This was associated with a change in the local arrangement of the chemical network, which is altered by the field. A mechanism of trapping and de-trapping of charge was determined by the analysis of the PEA response, light emission analysis coupled with external current. The studies were completed by a computer simulation of the effect of injected charge on the electric field.\ud The three techniques were found to be useful complementary tools to determine the effects of stress on this insulation material

Publisher: University of Leicester
Year: 2000
OAI identifier: oai:lra.le.ac.uk:2381/9231

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  1. (1963). A Concise guide to Plastics, second edition,
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  4. Acoustic and Optical Methods for Measuring Electric Charge Distributions in Dielectrics", doi
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  9. An Examination of the Effect of Mechanical Stress on Electrical Breakdown in Synthetic Resin Insulators ", doi
  10. (1963). An Introduction to Polymer Chemistry, doi
  11. Analysis of the luminescence Decay Following Excitation of Polyethylene Naphialate Films by an Electric Field", doi
  12. Brancato "Ageing of Equipment in the Electric Utilities",
  13. Calibration of the Pulse Electroacoustic Method. for Measuring Space Charge Density ",
  14. (2000). Characterisation of Charge farrier Traps in Polymeric Insulators ", Annual report CEIDP, doi
  15. Charge carrier detrapping
  16. Charge Distribution and Transport in Polymers ", doi
  17. (1998). Contribution ä /'Etude des Mecansimes d'Electroluminescence dans les Isolants Polymeres ", these de Doctorat, Universite Paul-Sabatier,
  18. Dependence of Electroluminescencelintensity and Spectral Distribution on Ageing Time in Polyethylene Naphthalate as Modelled by Space Charge Modified Internal I 'field ", doi
  19. Derivation of Accurate Glass Transition Temperatures by Scanning Calorimetry ", doi
  20. Detection of IX' threshold of Polyethylene Materials Through Space Charge and Electroluminescence Measurements", doi
  21. Determination des densites de charge d 'espace dans les isolants solides par la methode de l 'onde thermique ", doi
  22. Determination of Dielectric Behavior at Low Frequencies from Measurements of Anomalous Charging and Discharging Currents", doi
  23. Determination of the Polarisation Depth Distribution in Poled Ceramic Ferroelectrics Using Thermal and Pressure Pulse Technique", doi
  24. Dielectric and Conduction Processes in Polyetherether Ketone (PEEK) ", doi
  25. Dielectric Spectrometer - User Guide ", Private issue provided with the system of measurements
  26. Dielectric Spectroscopy of Polymeric Materials, doi
  27. Dielectrics, London Butteworths,
  28. Direct Measurement of Space Charge 11 jection from a Needle Electrode into Dielectric ", doi
  29. Dynamic Bipolar Charge Recombination Model for Electroluminescence in Polymer Based Insulation during Electrical Tree Initiation", doi
  30. Effect of Charge Injection and Extraction on Tree Initiation in Polyethylene ", doi
  31. (1994). Effect of Physical Aging on Dielectric, Thermal and Mechanical Properties of Cast-Epoxy Insulators ", doi
  32. Electrical Aging of Extruded Dielectric (ahles, A Physical model", doi
  33. Electrical Aging of Extruded Dielectric cables A Physical Model", doi
  34. Electrical Conduction and Carrier Traps in Polymeric Materials ", doi
  35. (1992). Electrical Degradation and Breakdown doi
  36. Electrical Properties of Polymers,
  37. Electrofracture Mechanics of Dielectric Aging", doi
  38. (1963). Electroluminescence and Related Effects, doi
  39. Electronic conduction in Polyethylene Naphthalate at High Electric Fields", doi
  40. Evidence of Near-Ultraviolet Emission during Electrical-Tree Initiation in Polyethylene ", doi
  41. Evolution Techniques for the Study of the Electrical Properties of Insulating Materials", doi
  42. (1994). Experimental Determination of the Dynamics of Space Charge Development in Insulators ", annual report,
  43. (1938). Fluorescence and Phosphorescence, doi
  44. Fluorescence of Benzoic Acid in Aqueous Acidic Media", doi
  45. (1255). Frequency Response Analyser, Operating Manuel, Solatron Instruments, Issue 2a, Part No.
  46. Handbook of Epoxy Resins, doi
  47. High field Conduction and Breakdown in Insulating Polymers", doi
  48. High Resolution PEA Charge Distribution Measurement System ", doi
  49. High Resolution PTA Charge Distribution Measurement System ", doi
  50. (1968). High-Voltage Technology edited by
  51. Identification of Space Charge in Cable Insulation: a New Approach Using Molecular Simulation " doi
  52. (1968). Instructions Specific Heat Kit 219-0136, Perkin Elmer Corporation,
  53. International Plastics Handbook, doi
  54. Les Resins Epoxydes ",
  55. Long-term Light Emission Measurement and Imaging during the Early Stages of Electrical Breakdown in Epoxy Resin", doi
  56. Materials Science, chapter 12, Third Edition, London Chapman & Hall,
  57. (1990). Materials Science, Third Edition, Chapman & Hall, doi
  58. Measurement of Spatial Charge Distribution in Thick Dielectrics Using the Pulse Electroacoustic Method", doi
  59. Modelling of Dielectic Relaxation Spectra of Polymers
  60. Nanoscopic Aspect of Electronic Aging in Dielectrics ", doi
  61. Nondestructive Laser Method for Measuring Charge Profiles in Irradiated Polymer Films", doi
  62. Observation of Dielectric Breakdown Sites in Polyethylene thin Film ", doi
  63. On the Nature of the Luminescence Emitted by a Propylene film after Interaction with a Cold Plasma at Low Temperature", doi
  64. Optical Emission due to Space ('harge Effects in the Electrically Stressed Polymers ", doi
  65. Optical Emission due to Space Charge Recombination in Insulating Polymers: an Insight into Electrical Ageing", Space Charge
  66. Optical Pre-Breakdown Warning in Insulating Polymers ",
  67. Partial Empirical Model of the Multifactor Aging of High Voltage Insulation ",
  68. (1978). Phase Transitions in Solids, London doi
  69. Physical Model of Electric Aging and Breakdown of Extruded Polymeric Insulated Power Cables ", doi
  70. Polymer Chemistry: an Introduction, doi
  71. (1995). Polymer Science and Technology, doi
  72. (1995). Polymer Sciences and Technology, London:
  73. Precision Differential Calorimetry and the Heat of Fusion of Polyethylene", doi
  74. Pulsed Electroacoustic Method for Measurement of Charge Accumulation in Solid Dielectrics", doi
  75. Quantitative Measurement of'Light Emission During the Early Stages of Electrical Breakdown in Epoxy and Unsaturated Polyester Resins", doi
  76. Review Article: Dielectric Relaxation in Solids",
  77. Review of Space Charge Measurements in Dielectrics",
  78. Review: Aging and Related Phenomena in Modern Electric Power Systems", doi
  79. (1981). Self-healing Breakdown at Spherulite Boundaries of Polyethylene Thin Films", doi
  80. Space Charge as a Trigger for electrial Ageing of Polymeric Insulation ", Space charge in Solid Dielectrics edited by
  81. Space Charge Characterisation for the 21th Century", doi
  82. Space Charge Injection and Extraction doi
  83. Space Charge Injection and Extraction in High Divergent Fields", doi
  84. Space Charge Measurement Techniques and Space Charge it, doi
  85. Spectral Analysis of Optical Emission Due to Isothermal Charge Recombination in Polyoleftns ", doi
  86. (2000). Spectroscopy Methods it, Organic Chemistry,
  87. Structural Evolution of Dimethacrylate Networks Studied by Dielectric Spectroscopy ", doi
  88. Study of Charge Injection in Insulators Submitted to Diverging Fields ", doi
  89. (1998). Study of Charge Injection it, Insulators Submitted to Diverging Fields", doi
  90. (1996). The Effect of Absorbed Water on Electrical Treeing in Epoxy Resins", doi
  91. The effect of Voltage and Material Age on the Electrical Tree Growth and Breakdown Characteristics of P poxy Resins ", doi
  92. The Morphology of Cross-linked PE", doi
  93. The Role of Trapped Space Charges in the Electrical Aging in Insulating Materials ", doi
  94. (1979). The Statistical Analysis of a High Voltage Endurance Test on an Epoxy", doi
  95. The Universal Dielectric Response and its Physical Significance", doi
  96. The Validation of the Thermal Step Method", doi
  97. Theory of Electroluminescence", doi
  98. Thermally Stimulated Measurements in Solid Dielectrics", doi
  99. (2000). These de Doctorat, Universite Paris VI, "Etude d'Isolants Soumis ä des
  100. (2000). These de Doctorat, Universite Paris VI, "Etude d'Isolants Soumis a des Champs Divergents par une
  101. (1999). Thin Film, High Voltage AC'/DC Pulsed Electra-Acoustic Apparatus ", 2nd biannual report,
  102. Time Domain Dielectric Spectroscopy: an Advanced Measuring System ", doi
  103. TSDC Measurements on Miniature and Full-Size Polymeric Cables ", Space charge in Solid Dielectrics edited by
  104. Understanding Optical Emissions . from Electrically Stressed Insulating Polymers: Electroluminescence in Polyethylene terephtalate) and Poly(ethylene 2,6-naphthalate) Films", doi
  105. Universal Relaxation law, London: Chelsea Dielectrics Press,

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