| Rachmawat, Rachmawati, Kojima, H., Kato, K., Zebouchi, N. and Hayakawa, N. 2022. Application of SiC-Filled permittivity and conductivity graded material (ε/σ-FGM) in HVDC GIS spacer. Presented at: 22nd International Symposium on High Voltage Engineering (ISH 2021), Xi'an, China, 21-26 November 2021. IET Conference Proceedings. , vol.2021 (15) pp. 1244-1248. 10.1049/icp.2022.0264 |
Abstract
The size reduction of HVDC GIS is needed for reduction of SF6 gas use. The challenge concerning the insulating material in HVDC GIS is to reduce the high electric field strength in gas around the solid insulators (spacers). Our previous works have shown the effectiveness of the functionally graded material (FGM) with graded permittivity (ε) and conductivity (σ) in controlling the high electric field strength under various DC operating conditions. However, ε/σ distributions were independent of each other. For practical implementation of FGM to HVDC GIS, the flexible mixture casting (FMC) method so far allows us to create a material whose ε/σ distributions are interdependent. In this paper, based on the measured dependence between ε and σ in SiC-filled epoxy composites, the electric field relaxation effect is evaluated under three different ε/σ distributions (U-type, grading-to-higher conductivity (GHC)-type and grading-to-lower conductivity (GLC)-type) applied to a 320 kV HVDC GIS spacer model. The results show that GLC-type ε/σ-FGM has effectively and constantly reduced the maximum electric field strength under the time-varying voltage application from DC-on to DC-steady state and against temperature differences between the high voltage and ground sides up to 70 K.
| Item Type: | Conference or Workshop Item (Paper) |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Engineering |
| Last Modified: | 25 Nov 2024 13:59 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/174206 |
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