Contact break discharges generated by electrical equipment in potentially explosive atmospheres are typically obtained at low voltages below 30 V and low currents between 30 mA and 100 mA are a relevant ignition source. The electrical characteristics of these discharges, which are dominated by metal vapor, have been presented in previous works. However, the transition phase from a discharge to a thermochemical ignition has not yet been properly analyzed. This prevents a multiphysical model from being developed and evaluation criteria from being defined for the non-ignition or ignition of a discharge. Here, the correlation between the electrical power of the discharge and the ignition is analyzed and estimated with the aim of correcting this shortcoming. The development of the discharge and its ignition, which depend on the electrical power input and its temporal and spatial distribution, are monitored and data for the ignition limit is determined. Initial estimations are made for the ignition limit by considering two models. The first model computes the ignition limit in a simplified manner by using the measured power input and certain empirical coefficients, while the second approaches regards the discharge in a more physical manner and implements a simplified but more detailed thermodynamic model. However, further investigations are necessary in order to ensure statistical significance for the results presented here.

电气设备在潜在爆炸性环境中产生的接触断路放电通常在低于 30 V 的低电压下获得，30 mA 至 100 mA 之间的低电流是相关的点火源。这些以金属蒸气为主的放电的电气特性已在以前的工作中提出。然而，尚未正确分析从放电到热化学点火的过渡阶段。这阻止了开发多物理模型和为放电的未点燃或点燃定义评估标准。在此，分析和估计放电电功率与点火之间的相关性以纠正该缺点。放电及其点火的发展，这取决于电力输入及其时间和空间分布，受到监控并确定点火极限数据。通过考虑两个模型对点火极限进行初步估计。第一个模型通过使用测量的功率输入和某些经验系数以简化的方式计算点火极限，而第二个方法以更物理的方式考虑排放并实施简化但更详细的热力学模型。但是，为了确保此处提供的结果具有统计显着性，还需要进一步调查。第一个模型通过使用测量的功率输入和某些经验系数以简化的方式计算点火极限，而第二个方法以更物理的方式考虑排放并实施简化但更详细的热力学模型。但是，为了确保此处提供的结果具有统计显着性，还需要进一步调查。第一个模型通过使用测量的功率输入和某些经验系数以简化的方式计算点火极限，而第二个方法以更物理的方式考虑排放并实施简化但更详细的热力学模型。但是，为了确保此处提供的结果具有统计显着性，还需要进一步调查。