Electric field grading and discharge inception voltage improvement on HVDC GIS/GIL spacer with permittivity and conductivity graded materials (ε/σ-FGM)

Rachmawati, Kojima, Hiroki, Kato, Katsumi, Zebouchi, Nabila and Hayakawa, Naoki 2022. Electric field grading and discharge inception voltage improvement on HVDC GIS/GIL spacer with permittivity and conductivity graded materials (ε/σ-FGM). IEEE Transactions on Dielectrics and Electrical Insulation 29 (5) , pp. 1811-1817. 10.1109/TDEI.2022.3194489

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Abstract

Functionally graded materials (FGM) application with graded permittivity and conductivity is promising as an effective technique for electric field relaxation in SF6 gas around HVDC gas insulated switchgear (GIS)/gas insulated transmission line (GIL) spacers. To approach the practical application of FGM to HVDC GIS/GIL spacers, this article investigates the electric field reduction effect given by permittivity and conductivity graded materials ( ε/σ -FGM) based on actual measured permittivity ( ε ) characteristics of SrTiO3-filled epoxy composites and conductivity ( σ ) characteristics of SiC-filled epoxy composites. In addition, theoretical discharge inception voltage (TDIV) of ε/σ -FGM spacer is calculated under standard lightning impulse (LI) voltage based on the volume–time theory. The results show that the ε/σ -FGM spacer with grading to lower permittivity (GLP) ( εr from 12.7 to 4) containing 0–26.9-vol% SrTiO3-filled epoxy composite and U-shaped graded conductivity containing 5–10-vol% SiC-filled epoxy composite is effective for electric field relaxation under DC steady state (DC-SS) and LI voltage where both resistive and capacitive fields present. It is attributed to the higher ε and σ of FGM spacer near the HV conductor/spacer interface. TDIV under LI voltage is also estimated to be 26% higher at 0.5 MPa-abs, compared with the conventional spacer without ε/σ grading.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Publisher:	Institute of Electrical and Electronics Engineers
ISSN:	1070-9878
Last Modified:	28 Sep 2022 12:15
URI:	https://orca.cardiff.ac.uk/id/eprint/152356

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