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Determination of the Spatial Impulse Response of Compensating Electrostatic Voltmeters

Löwe, Jens-Michael and Engelhardt, Jan and Secklehner, Maximilian and Hinrichsen, Volker (2020):
Determination of the Spatial Impulse Response of Compensating Electrostatic Voltmeters.
27, In: IEEE Transactions on Dielectrics and Electrical Insulation, 2020 (1), pp. 47-52. IEEE, ISSN 0018-9367; 1070-9878, e-ISSN 1557-962X; 1558-4135,
DOI: 10.1109/TDEI.2019.008305,
[Article]

Abstract

The accumulation of surface charges is a crucial challenge, especially for HVDC components. Accumulated surface charges can change the electric field distribution and generate weak points, especially in case of superimposed transient voltages and, therefore lower the performance e.g. of insulators. Hence, an accurate measurement of the surface potential and so the surface charges is necessary to optimize these components. Commonly, the surface potential is measured with an electrostatic voltmeter. In this study a procedure for determining the spatial impulse response of a compensating electrostatic voltmeter depending on only the surface to probe distance is presented. Based on the performed measurements a mathematical model is developed to describe the capacitive influence and significance of the local surface potential on the measurement result. The actual measurement value is a weighted and averaged value given by the actual position and its surrounding, which is also confirmed by numerical simulations. The performed procedure enables high accuracy of the measurement of surface potentials and so of surface charges using different types of electrostatic voltmeters and shows the limitation of the measurement procedure. This knowledge increases the possibility to design optimized components for HVDC systems.

Item Type: Article
Erschienen: 2020
Creators: Löwe, Jens-Michael and Engelhardt, Jan and Secklehner, Maximilian and Hinrichsen, Volker
Title: Determination of the Spatial Impulse Response of Compensating Electrostatic Voltmeters
Language: English
Abstract:

The accumulation of surface charges is a crucial challenge, especially for HVDC components. Accumulated surface charges can change the electric field distribution and generate weak points, especially in case of superimposed transient voltages and, therefore lower the performance e.g. of insulators. Hence, an accurate measurement of the surface potential and so the surface charges is necessary to optimize these components. Commonly, the surface potential is measured with an electrostatic voltmeter. In this study a procedure for determining the spatial impulse response of a compensating electrostatic voltmeter depending on only the surface to probe distance is presented. Based on the performed measurements a mathematical model is developed to describe the capacitive influence and significance of the local surface potential on the measurement result. The actual measurement value is a weighted and averaged value given by the actual position and its surrounding, which is also confirmed by numerical simulations. The performed procedure enables high accuracy of the measurement of surface potentials and so of surface charges using different types of electrostatic voltmeters and shows the limitation of the measurement procedure. This knowledge increases the possibility to design optimized components for HVDC systems.

Journal or Publication Title: IEEE Transactions on Dielectrics and Electrical Insulation
Volume: 27
Journal volume: 2020
Number: 1
Publisher: IEEE
Uncontrolled Keywords: electric potential, electric charge, insulation, surface charging, electrostatic voltmeter, transient response
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Fluid Mechanics and Aerodynamics (SLA)
18 Department of Electrical Engineering and Information Technology
18 Department of Electrical Engineering and Information Technology > Institute for Electrical Power Systems > High Voltage Technology
18 Department of Electrical Engineering and Information Technology > Institute for Electrical Power Systems
DFG-Collaborative Research Centres (incl. Transregio)
DFG-Collaborative Research Centres (incl. Transregio) > Transregios
DFG-Collaborative Research Centres (incl. Transregio) > Transregios > TRR 75 Droplet Dynamics Under Extreme Ambient Conditions
Date Deposited: 13 Dec 2019 08:03
DOI: 10.1109/TDEI.2019.008305
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