A directional coupler for partial discharge measurements in gas-insulated substations

Christian Mier*, Armando Rodrigo Mor, Peter Vaessen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

This paper introduces a directional coupler for partial discharge (PD) measurements in gas-insulated substations (GIS). The sensor comprises a combination of magnetic and electric couplers, effectively segregating forward and backward pulses to enhance PD charge estimation and defect location. The sensor's design was supported with finite element method simulations and measurements conducted in a transverse electromagnetic test bench. Comparative analyses were performed against independent magnetic and electric couplers. The charge estimation and the directional coupler's directivity were evaluated in both the test bench and a full-scale GIS with different PD defects. Initially, the combined magnetic and the electric couplers exhibited undesired interactions, prompting corrective measures. Subsequent adjustments included changes to the electric coupler material and modifications to the magnetic coupler construction. The resulting high-voltage directional coupler performed better than the separated couplers in a GIS with discontinuities. This partial discharge sensor emerges as a candidate for future SF6-free alternative GIS.

Original languageEnglish
Article number113996
Number of pages9
JournalMeasurement: Journal of the International Measurement Confederation
Volume225
DOIs
Publication statusPublished - 2024

Keywords

  • Calibration
  • Directional coupler
  • Gas-insulated
  • Partial discharges
  • PD sensors

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