Experimental study on the autoignition characteristics of pure and oil-impregnated transformer insulating paper board

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• 作者：Xishi Wang ; Pei Zhu ; Hongli Xu ; Minghao Fan
• 关键词：Autoignition time ; Insulating paper ; Transformer oil ; Combustion characteristics ; Cone calorimeter
• 刊名：Journal of Thermal Analysis and Calorimetry
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：127
• 期：3
• 页码：2489-2497
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Physical Chemistry; Analytical Chemistry; Polymer Sciences; Inorganic Chemistry; Measurement Science and Instrumentation;
• 出版者：Springer Netherlands
• ISSN：1588-2926
• 卷排序：127

文摘

In order to deepen the knowledge of transformer fire dynamics and its fire prevention, an experimental study on autoignition and combustion characteristics of pure insulating transformer paper board (PIPB) and oil-impregnated transformer insulating paper board (OIIPB) were performed. Ignition time, heat release rate (HRR), O₂, CO and CO₂ concentrations were obtained by a cone calorimeter under different external radiant heat fluxes. The results show that two peaks of HRR occurred during the burning process of PIPB, where three peaks occurred for the OIIPB. The first peak of the OIIPB occurred earlier than that of PIPB, which indicates that OIIPB is more ignitable, but the maximum HRR of PIPB is higher than that of OIIPB, which indicates that the combustion intensity of PIPB is larger. The PIPB has a relatively higher CO and CO₂ yield and O₂ consumption. The results demonstrate that both the tested 3-mm-thick PIPB and OIIPB samples in this study can be considered as thermally thick materials. Autoignition time of OIIPB and PIPB under external heat fluxes could be predicted based an empirical model, and the critical heat fluxes were obtained based on the models and the ignition data.