A Development of a Capacitive Voltage Divider for High Voltage Measurement as Part of a Combined Current and Voltage Sensor

Authors

  • Roman Hrbac Faculty of Electrical Engineering and Computer Science, VSB-Technical University of Ostrava
  • Vaclav Kolar Faculty of Electrical Engineering and Computer Science, VSB-Technical University of Ostrava
  • Mikolaj Bartlomiejczyk Faculty of Electrical and Control Engineering, Gdansk University of Technology
  • Tomas Mlcak Faculty of Electrical Engineering and Computer Science, VSB-Technical University of Ostrava
  • Petr Orsag Faculty of Electrical Engineering and Computer Science, VSB-Technical University of Ostrava
  • Jakub Vanc Faculty of Electrical Engineering and Computer Science, VSB-Technical University of Ostrava

DOI:

https://doi.org/10.5755/j01.eie.26.4.25888

Keywords:

Voltage measurement, Capacitive divider, Temperature dependence, Error compensation

Abstract

This article deals with the development of capacitive voltage divider for high voltage measurements and presents a method of analysis and optimization of its parameters. This divider is a part of a combined voltage and current sensor for measurements in high voltage power networks. The sensor allows continuous monitoring of the network distribution status and performs a quick diagnosis and location of possible network failures. Deployment of these devices will support semi-autonomous control of power networks and it can be considered as a step from traditional power grids toward smart grids. This is a worldwide trend connected with increasing number of renewable energy sources and plug-in electric vehicles as described in. In this way, it contributes to the reliability of the distribution network. Together with automated control techniques and fault location methods, it enables its self-healing capability. The following characteristics required for the sensor include: current measurement error up to 2 %, voltage measurement error up to 0.5 %, and power measurement error up to 5 %. At the same time, it is necessary that the sensor is cost-effective - relatively cheap. There were selected capacitors made in series production for the capacitive divider designing. The capacitive voltage divider was tested in terms of time and temperature stability; the results are described in the paper. Then, the method of mathematical correction of a temperature dependence of the capacitive voltage divider was suggested and tested.

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Published

2020-08-07

How to Cite

Hrbac, R., Kolar, V., Bartlomiejczyk, M., Mlcak, T., Orsag, P., & Vanc, J. (2020). A Development of a Capacitive Voltage Divider for High Voltage Measurement as Part of a Combined Current and Voltage Sensor. Elektronika Ir Elektrotechnika, 26(4), 25-31. https://doi.org/10.5755/j01.eie.26.4.25888

Issue

Section

ELECTRONIC MEASUREMENTS