A Review of the Correlation Between SF6 Decomposition Products and Partial Discharge in Gas-Insulated Switchgear

Najla Alshamsi

Abstract: Gas-insulated switchgear (GIS) relies on sulfur hexafluoride (SF₆) due to its superior dielectric and arc-quenching characteristics. However, partial discharge (PD) activity within GIS leads to SF₆ decomposition, forming gaseous by-products that serve as diagnostic indicators. This technical review synthesizes literature review linking specific PD types-such as corona, voids, moving particle, and floating electrodes-with corresponding SF₆ breakdown products like SO₂, SOF₂, SO₂F₂, and CF₄. Emphasis is placed on correlating these chemical signatures with defect types to enable early fault detection and condition-based maintenance. The paper also identifies limitations in current diagnostic frameworks and proposes future research incorporating multi-parameter analysis and machine learning models.

Keywords: SF₆ decomposition, partial discharge, gas-insulated switchgear, fault diagnostics, predictive maintenance

How to Cite?: Najla Alshamsi, "A Review of the Correlation Between SF6 Decomposition Products and Partial Discharge in Gas-Insulated Switchgear", Volume 14 Issue 12, December 2025, International Journal of Science and Research (IJSR), Pages: 2229-2231, https://www.ijsr.net/getabstract.php?paperid=SR251223120221, DOI: https://dx.doi.org/10.21275/SR251223120221