| Abstract | This paper proposes ultra-high frequency detection of the eroding dry band arcing as a non-intrusive and online detection technique of erosion failure during the DC inclined plane test. Tests are performed on silicone rubber composites, while conducting leakage current, surface temperature and ultra-high frequency measurements using a horn antenna. No ultra-high frequency detection is evident during mild dry-band arcing, which does not lead to erosion. Whereas, the detection is evident during stable dry-band arcing, particularly when the intensity becomes remarkable. Thermogravimetry, differential thermal analysis and Fourier Transform spectroscopy are conducted to elucidate temperature measurements and visual observations. The eroding dry-band arcing is shown leading to depolymerization of silicone rubber at 400°C, thereby leading to combustion and erosion failure, and stimulating a radical-based crosslinking reaction at temperatures exceeding 500°C. The intensity of the ultra-high frequency detection is also shown to be sensitive to the severity of the eroding dry-band arcing as it increased with time during the test or with higher applied test voltages. |
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