A finite element method for the determination of space charge distributions in complex geometry

Paris, O.; Lewiner, J.; Ditchi, Thierry; Holé, Stephane; Alquié, C.

doi:10.1109/94.868077

Cited by 16 publications

(6 citation statements)

References 11 publications

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“…Bulk techniques can be subdivided into a few major groups: (i) methods based on thermal diffusion [35], such as thermal pulse (TP) [36], thermal step pulse (TSP) [37] and laser intensity modulation (LIMM) [38,39]; (ii) methods that monitor propagation of pressure waves [40], e.g. laser induced pulse pressure (LIPP) [41], pressure wave propagation (PWP) [42], piezoelectrically induced pressure step (PIPS) [43], pulsed electroacoustic (PEA) [44], non-structured acoustic pulse (NSAPM) [45] and acoustic probes [46]; and (iii) electro-optic methods based on the Pockels [47] and Kerr [48] effects.…”

Section: Charge Detection Methods For Insulatorsmentioning

confidence: 99%

Detection of charge distributions in insulator surfaces

Rezende¹,

Gouveia²,

Silva³

et al. 2009

J. Phys.: Condens. Matter

106

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Charge distribution in insulators has received considerable attention but still poses great scientific challenges, largely due to a current lack of firm knowledge about the nature and speciation of charges. Recent studies using analytical microscopies have shown that insulators contain domains with excess fixed ions forming various kinds of potential distribution patterns, which are also imaged by potential mapping using scanning electric probe microscopy. Results from the authors' laboratory show that solid insulators are seldom electroneutral, as opposed to a widespread current assumption. Excess charges can derive from a host of charging mechanisms: excess local ion concentration, radiochemical and tribochemical reactions added to the partition of hydroxonium and hydronium ions derived from atmospheric water. The last factor has been largely overlooked in the literature, but recent experimental evidence suggests that it plays a decisive role in insulator charging. Progress along this line is expected to help solve problems related to unwanted electrostatic discharges, while creating new possibilities for energy storage and handling as well as new electrostatic devices.

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Section: Charge Detection Methods For Insulatorsmentioning

confidence: 99%

Detection of charge distributions in insulator surfaces

Rezende¹,

Gouveia²,

Silva³

et al. 2009

J. Phys.: Condens. Matter

106

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“…This was achieved by using a simulation based on the method of finite element already presented for similar geometries [23].…”

Section: Divergent Fieldmentioning

confidence: 99%

Electroluminescence excitation mechanisms in an epoxy resin under divergent and uniform field

Griseri

Dissado

Fothergill

et al. 2002

IEEE Trans. Dielect. Electr. Insul.

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This is the unspecified version of the paper.This version of the publication may differ from the final published version. Permanent repository link: ABSTRACTElectroluminescence excitation mechanisms have been investigated in epoxy resin under divergent and uniform field situations. Metallic wires embedded in the resin were used to produce field divergence whereas film samples were metallised to obtain a uniform field. Electroluminescence under divergent field was stimulated by an impulse voltage. Light was emitted on the positive and negative fronts of the square pulses when the field exceeded 20 kV/mm at the wire surface, with equal intensity and without polarity dependence. There was evidence of space charge accumulation around the wires in multiple-pulse experiments. Charge injection and extraction occurring at both fronts of the pulse provide the condition for EL excitation. Further excitation of the EL during the plateau of the voltage pulse is prevented by the opposite field of the trapped charge. Field computation with and without space charge supports the proposed interpretation. A DC voltage was used for the uniform field experiments. A continuous level of electroluminescence is found at 175 kV/mm. Charging/discharging current measurements and space charge profile analyses using the pulsed electro-acoustic (PEA) technique were performed at different fields up to the EL level. Dipolar orientation generates a long lasting transient current that prevents the conduction level being reached within the experimental protocol (one hour poling time). The continuous EL emission is nevertheless associated with a regime where the conduction becomes dominant over the orientational polarization. Polarization and space charge contribute to the PEA charge profiles. Homo-charge injection at anode and cathode is seen at 20 kV/mm and a penetration of positive space charge in the bulk is detected above 100 kV/mm, suggesting an excitation of the continuous EL by bipolar charge recombination.2 INTRODUCTIONElectroluminescence (EL) will be defined in our context as the light emitted from a solid material when subjected to an electric stress. It results from the radiative relaxation of excited states that are created by the application of the field. These states can be delocalized when dealing with EL of semiconducting materials [1,2], or highly localized when dealing with large band gap materials such as polymers used as insulation in electrical engineering [3]. In the latter case, it has been known for a long time that the existence of internal gas-filled cavities can also be at the origin of a light emission due to the excitation of gaseous molecules accompanying discharge occurrence [4]. In this paper, we will focus on the investigation of the light emitted by the material by taking care not to introduce any internal cavities of a size suitable to sustain partial discharges. This needs careful control during sample preparation.EL detection in a given material is evidence of the generation of excited states of energy bet...

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“…When the material is submitted to a divergent field, until now only a simulation approach has been used to retrieve the charge distribution from the signal [21].…”

Section: Signal Analysismentioning

confidence: 99%

Space Charge Distribution Measurement in Complex Insulating Structures

Holé

2010

IEEJ Transactions Elec Engng

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Electrical insulation involves more and more complex structures in which the electric field or the material can be heterogeneous. For testing space charge buildup in such structures, one-dimensional measurements are still often used owing to their simplicity. The sample complexity may, however, induce spurious effects that can be confused with space charge. In this paper, from the underlying physics of the pressure-wave propagation (PWP) and the electro-acoustic (PEA) methods, limitations of the one-dimensional model are shown and an analysis procedure is given. 

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A finite element method for the determination of space charge distributions in complex geometry

Cited by 16 publications

References 11 publications

Detection of charge distributions in insulator surfaces

Detection of charge distributions in insulator surfaces

Electroluminescence excitation mechanisms in an epoxy resin under divergent and uniform field

Space Charge Distribution Measurement in Complex Insulating Structures

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