02-Session2_00-NEXAN-Miroir_SEE_oct_2012.pdf

22/10/2012
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OAI : oai:www.see.asso.fr:2991:3105
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02-Session2_00-NEXAN-Miroir_SEE_oct_2012.pdf

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1 Space charge and mirror method Pierre Mirebeau 2 The technical challenge Live breakdown Isothermal case Space charges at work Space charge motion non isothermal case calculation Known synthetic insulation systems cannot match the space charge stress 3 The technical challenge Live breakdown Isothermal case Space charges at work Space charge motion non isothermal case calculation Known synthetic insulation systems cannot match the space charge stress Breakdown 4 The technical challenge Live breakdown Isothermal case Space charges at work Space charge motion non isothermal case calculation Known synthetic insulation systems cannot match the space charge stress 5 The technical challenge Live breakdown Isothermal case Space charges at work Space charge motion non isothermal case calculation Known synthetic insulation systems cannot match the space charge stress 6 The innovation steps Development tool: the dielectrometer The electrode is the electron beam Development of a space charge tolerant insulation Development of the semiconductive electrodes 7 SEM Mirror Method : “The Dielectrometer”  Output of Mirror Method :  Trapping ability of (Qp, Vd, radial extension of trapped charge…)  Maximum “local” amount of charge : characterisation of a “local” breakdown strength  Characterisation of key properties regarding HVDC expectations 8 equipotential vacuum insulator Electron beam 0.1-5 keV Scanning Electron Microscope 1st step Injection vacuum insulator Gun aperture 2nd step Observation Trapped charge Electron beam 10-40 keV Dark spot diameter d as a function of potential d’ d’ Principle of Mirror Method 9 • multipolar development of potential 1 4 2 0 2 3 d L d V AQ R V AQP P' Linear part 0 500 1000 1500 2000 2500 3000 3500 0,00 0,05 0,10 0,15 0,20 1/d(m -1 ) V (volts) Vd Non-linear part Classical optics / electrostatics 1 4 d L d V AQP' • charge spreading • implantation depth A o r 1 2 1( ) with … Analysis of the Mirror curve R0 Hemispheric distribution 10 Some results Samples : Ø 12 mm and 4.2 mm thick, press moulded - Qi = 13 pC 0 1000 2000 3000 0.00 0.05 0.10 0.15 0.20 0.25 1/d(m) V (volts) material A material B material C material D Mirror curves obtained on 4 insulating materials at room temperature (every data point corresponds to 5 measurements). A B C D Qt (pC) 10 10.4 10.6 11.1 Vd (V) 2850 2900 2150 2450 R0 (µm) 26 30 36 37 (C/m3) 254 184 100 105 • A matrix concentrates charge (deep traps) whereas C and D matrixes spread charges (evidence of shallow traps). Material B exhibits an intermediate behaviour. Extracted parameters from the Mirror curves 11 Mirror as a function of temperature Mirror measurement of the temperature stability of the charge which has been trapped at room temperature for three different insulation materials 12 Thank you!