An investigation of the ignition hazards associated with various materials in the breakflash apparatus

Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting Pub Date : 1991-09-28 DOI:10.1109/IAS.1991.178023

J. Peterson

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Abstract

The US Bureau of Mines Pittsburgh Research Center has completed an investigation of the degree to which various disk materials affect the probability of igniting a methane-air atmosphere using the breakflash machine. Data were generated for estimating currents (resistor or inductor circuits) and voltages (capacitor circuits) associated with a particular ignition level. Further analysis of these data was used to assign hazard levels for each material, with cadmium used as a reference material. From this, a safety factor was associated with each material. Presently, there are no construction requirements with regard to materials of construction. The worst case is always assumed (i.e., cadmium). Laboratory test results confirmed cadmium as the worst-case material among those tested for resistor and inductor circuits but not for capacitor circuits. In fact, aluminum testing illustrated lower ignition voltages than cadmium at 107 and 1310 mu F. For capacitor circuits, little, if any, safety was gained by using certain materials other than cadmium.<>

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对断路器中各种材料的着火危险进行了调查

美国矿业局匹兹堡研究中心已经完成了一项调查，调查了各种圆盘材料对使用断路器点燃甲烷-空气环境的可能性的影响程度。产生的数据用于估计电流(电阻或电感电路)和电压(电容电路)与特定的点火水平有关。通过对这些数据的进一步分析，确定了每种材料的危害等级，并以镉作为参考材料。由此得出了与每种材料相关的安全系数。目前对建筑材料没有施工要求。总是假设最坏的情况(例如，镉)。实验室测试结果证实，在电阻器和电感电路测试中，镉是最坏的材料，而在电容器电路测试中则没有。事实上，铝测试表明，在107 μ f和1310 μ f时，铝的点火电压比镉低。对于电容器电路来说，使用镉以外的某些材料几乎没有获得安全性。

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Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting

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