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Model-based accuracy enhancements for guarded conductivity measurements:determination of effective electrode areas utilising numerical field simulation

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High Voltage 2018年第3期3卷 217-225页

作者： Claudius Freye frank jenau Institute of High Voltage Engineering TU Dortmund University44227 DortmundGermany

Methods utilising current measurements for conductivity and permittivity determination require precise knowledge of the effective electrode area in order to obtain accurate *** to field distortions(*** by fringing)in guarded electrode setups,the effective electrode area differs significantly from the geometrical *** on guarded electrode setups for conductivity determination,a generic method based on numerical field simulation is presented allowing a convenient determination of the relevant effective electrode *** this purpose,a brief overview of yet existing normative guidelines and related research work is ***-of-the-art conductivity measurement setups are presented in order to identify parameters which affect the field distribution within the measurement *** description of the implemented method and its realisation in COMSOL multiphysics is followed by its validation using analytical fringing ***,presented method is used for the evaluation of fringing effects and additional field distortion caused by design aspects of the measurement cell itself and potential imbalances related to the measurement ***,dependencies on conductivity of the surrounding environment are *** model-based accuracy enhancements are calculated and are leading to a gain in precision for conductivity determination of up to 25%compared to yet existing approaches.

关键词： electrode conductivity determination

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Transient voltage stresses in MMC-HVDC links-impulse analysis and novel proposals for synthetic laboratory generation

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High Voltage 2018年第2期3卷 115-125页

作者： Claudius Freye Simon Wenig Max Goertz Thomas Leibfried frank jenau Institute of High Voltage Engineering TU Dortmund University44227 DortmundGermany Institute of Electrical Energy Systems and High-Voltage Technology Karlsruhe Institute of Technology(KIT)76131 KarlsruheGermany

To evaluate and optimise insulation coordination concepts for state of the art high-voltage direct current(HVDC)transmission systems,appropriate test voltage shapes are required for laboratory imitation of occurring *** especially transient voltages in the monopolar modular multilevel converter(MMC)-HVDC links show an extensive deviation from commonly applied switching impulse shapes,this study focusses on the analysis of over-voltages subsequent to direct current pole to ground ***,novel methods for synthetic laboratory test voltage generation are *** on simulated transients occurring during fault scenarios in different symmetrical monopolar±320 kV MMC-HVDC schemes,curve fitting,and related analysis techniques are used in order to compare simulated over-voltages with standard test voltage ***,these techniques further allow the identification of novel relevant impulse ***,design considerations for the generation of non-standard impulses based on single-stage circuits are derived and *** synthetically generated voltages may,later on,provide the basis for future investigations on related dielectric effects caused by those non-normative over-voltages.

关键词： analysis insulation transient

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