中文摘要：

直流供电系统中，接头松动、绝缘老化等原因是引起直流串联电弧故障的主要因素，且串联直流电弧不易检测，具有很大的安全隐患，因此提出一种有效的直流电弧故障检测方法具有重大的意义。本文搭建了串联直流电弧试验平台，利用串联直流电弧发生器模拟直流电路中接头松动、绝缘损坏的直流串联电弧故障。通过研究直流电弧电压电流的基本特性，以及国内外的研究现状，研究分析电弧电流波形在一定时间窗内周期均值的变化，提出了一种基于电弧电流周期均值变化率的检测方法。结果表明，发生电弧前后电弧电流周期均值变化率具有明显区别，验证了用电弧电流周期均值变化率识别直流电弧故障的可行性。

英文摘要：

Aging of the insulation and loose joint in the DC supply system are main factors to induce series DC arc.The series DC arc fault is difficult to be detected ,posing a serious risk to the system. Therefore,it is of great significance to find a kind of method of the DC arc fault detection. In this paper, the series DC arc is simulated by the series DC arc generator. And a detection method based on the rate of DC arc current cycle mean is proposed by studying the basic characteristic of the series DC arc current and status quo of research both at home and abroad. The rate of DC arc current cycle mean is quite different when the arc happens or not happen.The result shows that the method is feasible to detect the series DC arc fault.