基于DSP的矿井低压电网快速断电安全技术的研究

低压电缆电气故障产生的电弧、电火花是造成煤矿瓦斯爆炸事故的主要点火源。为保证低压电缆在受到外部机械损伤造成电气故障时不至于释放出足以引燃引爆瓦斯的能量,本文提出了以IGBT为主元件的快速断电中性点固态断路器拓扑结构,并针对矿井低压系统的特点提出基于模式识别法的选择性超快速单相接地保护算法以及基于电流变化率的超快速短路保护算法,从软硬件两方面提高开关的断电速度,缩短电弧、电火花持续时间。实验表明,基于该拓扑结构的快速断电SSCB配合单相接地保护和短路保护,能够实现全断电时间不大于3ms的目标。

Research on ultra-high-speed interruption safety technology for mine low-voltage power system based on DSP

The electric arc or spark originating from the low voltage cable fault is the major source of the coal mine gas explosion accident.In order to limit the energy detonating gas which is caused by the fault,the topology of neutral solid state circuit breaker is put forward in this paper in which IGBTs work is the main components of this device.Directed against the mine low-voltage power system,selective and ultra-high-speed single-phase electric leakage protection based on pattern recognition method and ultra-high-speed short circuit protection based on current rate of change are proposed to meet the requirements of full fault time,in which the fault duration should be shortened to no more than 3ms.Results of the experiments show its satisfactory performance.