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

Wang, Xishi; Zhu, Paikun; Xu, Hongli; Fan, Minghao

doi:10.1007/s10973-016-5717-y

Cited by 15 publications

(10 citation statements)

References 23 publications

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“…Meanwhile, black smoke was gradually observed in this stage. At the steady burning stage, 19 0.128 heat capacity (J/(kg K)) 22 1960 effective heat of combustion (MJ/kg) 6 40 the burning rate and the flame height are nearly constant for a relatively long period of time. In this period, the heat feedback from the flame to the fuel surface and the heat-transfer process are nearly constant.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, the effects of the thickness of transformer oil on the ignition characteristics were also discussed in the paper . Wang et al performed experiments on the autoignition characteristics of pure and oil-impregnated transformer insulating paper board and analyzed the ignition time, heat release rate, and gas concentrations during fuel burning. It is worthwhile to note that in these studies, ,, , the equivalent diameter of the fire ( , where S is the pool area) is all less than 10 cm, for which conduction is the dominant heat-transfer mode, in comparison to radiation in real pool fire scenarios or experiments. , Clearly, there is a lack of experimental data for the quantitative thermal hazard analysis and corresponding firefighting for transformer fire accidents.…”

Section: Introductionmentioning

confidence: 99%

“…Wang et al performed experiments on the autoignition characteristics of pure and oil-impregnated transformer insulating paper board and analyzed the ignition time, heat release rate, and gas concentrations during fuel burning. It is worthwhile to note that in these studies, ,, , the equivalent diameter of the fire ( , where S is the pool area) is all less than 10 cm, for which conduction is the dominant heat-transfer mode, in comparison to radiation in real pool fire scenarios or experiments. , Clearly, there is a lack of experimental data for the quantitative thermal hazard analysis and corresponding firefighting for transformer fire accidents.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on the Burning Characteristics of Transformer Oil Pool Fires

et al. 2020

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This paper examines experimentally the burning behaviors of transformer oil pool fires. A series of transformer oil pool fire tests with different pool diameters (0.2~1m) was conducted. The mass burning rate, flame height, liquid layer temperature, flame temperature, and radiative heat flux were measured and analyzed.A new correlation for the mass burning rate as a function of pool diameter is deduced.The experimental flame height is compared to existing correlations and it is found that the present result is in better agreement with those deduced for heavy oils. The liquid temperature results show that the fuel layer consists of a boiling layer and a gradient layer, and the thickness of the boiling layer is found to be around 2.6 mm independent of the pool diameter. The flame temperature is also analyzed and three zones are observed, for which a piecewise function is deduced. The radiation fraction and the emissive power of the flame are determined respectively based on the source flame model and solid flame model, and an exponential decay of the radiation fraction as a function of pool diameter is obtained. The present results are important for estimation of thermal radiation from a pool fire on the surrounding objects in practical transformer oil fires.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Study on the Burning Characteristics of Transformer Oil Pool Fires

et al. 2020

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“…For the gasoline immersed paperboard, there were obviously two combustion processes: the combustion of gasoline and the carbonization of paperboard. Wang et al investigated the auto‐ignition characteristics of pure and oil‐impregnated transformer insulating paper boards. The comparisons of ignition time, HRR and gas yields of the pure and oil‐impregnated transformer insulating paper boards were conducted.…”

Section: Introductionmentioning

confidence: 99%

“…In the study of Yang , the external heat environment was not considered. There were three external radiation heat fluxes considered in Wang's study . However, only the external radiation heat fluxes of 25 and 50 kW/m 2 were investigated in the analysis of the HRR and gas yields.…”

Section: Introductionmentioning

confidence: 99%

Effects of external radiation heat flux on combustion characteristics of pure and oil‐impregnated transformer insulating paperboard

Zhang

Fan

et al. 2017

Process Safety Progress

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The effects of external radiation heat flux on the combustion characteristics of pure transformer insulating paperboard (PTIP) and oil‐impregnated transformer insulating paperboard (OITIP) were investigated experimentally. The experiments were conducted with the cone calorimeter using five external radiation heat fluxes that ranged from 25 to 80 kW/m2. The results showed that the ignition time decreased with the external radiation heat flux, and the ignition time of PTIP was much longer than that of OITIP. Both the PTIP and OITIP are thermal thick materials, and the critical radiation heat flux of the PTIP was larger than that of the OITIP. For the PTIP, the peak of the heat release rate (HRR) and toxic gas productions had no significant difference, while those of the OITIP increased with the external radiation heat flux. The HRR peak of the PTIP was larger than that of the OITIP with the external radiation heat fluxes of 25, 35, 50, and 65 kW/m2. When the radiation heat flux increased to 80 kW/m2, the HRR peak of the OITIP became higher. From the perspective of the CO production rate, the hazard of PTIP fires was more severe than that of OITIP fires under the external radiation heat fluxes of 25 and 35 kW/m2. The CO production rate of the PITP was lower than that of the OITP with the high external radiation heat fluxes of 50, 65 and 80 kW/m2. © 2017 American Institute of Chemical Engineers Process Process Saf Prog 37:362–368, 2018

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Effect of immersion time on the combustion characteristics of oil‐impregnated transformer insulating paperboard

et al. 2022

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Transformer insulating paperboard is an insulating material commonly used in the oil-filled equipment in substations, which is usually immersed in the transformer oil.In this study, the effects of immersion time on the combustion characteristics of oil-impregnated transformer insulating paperboard are studied using the thermogravimetric, UL94 vertical flammability, and cone calorimeter experiments. The experimental results show that the total oil content increases with increasing immersion time and reaches the saturation state in 240 h, with a saturation content of 14.7% ± 0.5%. However, the distribution of oil content inside the paperboard is uneven. At the saturation state, the surface oil content is 35.5%, being about 3 times of the core oil content. The results of UL94 vertical flammability experiments show that the flame spread rate increases with increasing immersion time and is controlled by the total oil content. In the cone calorimeter experiments, the time to ignition is significantly reduced compared to the clean paperboard. Unlike the flame spread rate, the ignition time is controlled by the surface oil content and barely varies with immersion time. The critical heat flux of oil-impregnated transformer insulating paperboard is found as 3.9 kW/m 2 , being only 1/3 of clean paperboard. With increasing immersion time, the peak heat release rate increases, while the total heat release, fire growth index, and effective heat of combustion present linear correlations with the total oil content. The CO yield increases with increasing immersion time, and the released CO mainly comes from the combustion of transformer oil.

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

Cited by 15 publications

References 23 publications

Experimental Study on the Burning Characteristics of Transformer Oil Pool Fires

Experimental Study on the Burning Characteristics of Transformer Oil Pool Fires

Effects of external radiation heat flux on combustion characteristics of pure and oil‐impregnated transformer insulating paperboard

Effect of immersion time on the combustion characteristics of oil‐impregnated transformer insulating paperboard

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