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

作     者：Claudius Freye Frank Jenau 

作者机构：Institute of High Voltage EngineeringTU Dortmund University44227 DortmundGermany 

出 版 物：《High Voltage》 (高电压（英文）)

年 卷 期：2018年第3卷第3期

页      面：217-225页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：the federal ministry for economic affairs and energy of Germany for the support of this work as a part of the E2HGÜproject(FKZ 03ET7514) 

主　　题：electrode conductivity determination 

摘      要：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.