Du Jian-Hua, Tu Ran, Zeng Yi, Pan Leng, Zhang Ren-Cheng
College of Mechanical Engineering and Automation, Huaqiao University, Xiamen, Fujian, China.
College of Tourism, Huaqiao University, Quanzhou, Fujian, China.
PLoS One. 2017 Aug 10;12(8):e0182811. doi: 10.1371/journal.pone.0182811. eCollection 2017.
The characteristics of a series direct current (DC) arc-fault including both electrical and thermal parameters were investigated based on an arc-fault simulator to provide references for multi-parameter electrical fire detection method. Tests on arc fault behavior with three different initial circuit voltages, resistances and arc gaps were conducted, respectively. The influences of circuit conditions on arc dynamic image, voltage, current or power were interpreted. Also, the temperature rises of electrode surface and ambient air were studied. The results showed that, first, significant variations of arc structure and light emitting were observed under different conditions. A thin outer burning layer of vapor generated from electrodes with orange light was found due to the extremely high arc temperature. Second, with the increasing electrode gap in discharging, the arc power was shown to have a non monotonic relationship with arc length for constant initial circuit voltage and resistance. Finally, the temperature rises of electrode surface caused by heat transfer from arc were found to be not sensitive with increasing arc length due to special heat transfer mechanism. In addition, temperature of ambient air showed a large gradient in radial direction of arc.
基于电弧故障模拟器，研究了串联直流（DC）电弧故障的特性，包括电气和热参数，为多参数电气火灾探测方法提供参考。分别对三种不同初始电路电压、电阻和电弧间隙的电弧故障行为进行了测试。解释了电路条件对电弧动态图像、电压、电流或功率的影响。此外，还研究了电极表面和周围空气的温度升高情况。结果表明，首先，在不同条件下观察到电弧结构和发光有显著变化。由于电弧温度极高，发现电极产生的蒸汽形成了一层薄的橙色外燃层。其次，在放电过程中，随着电极间隙的增加，对于恒定的初始电路电压和电阻，电弧功率与电弧长度呈现非单调关系。最后，由于特殊的传热机制，发现由电弧传热引起的电极表面温度升高对电弧长度增加不敏感。此外，周围空气的温度在电弧径向方向上显示出很大的梯度。
