漏电不仅是低压矿井电网产生故障的主要形式之一，而且是影响工矿企业安全供电以及人身安全的重要因素。因此，在矿井电网特殊环境下准确可靠地判定漏电支路是亟待解决的问题。由于漏电机理较为复杂，影响因素较多，且漏电信号微弱，特征不明显，故矿井电网漏电保护一直是一个很难解决的课题。本论文基于对故障过程分析的基础上，探寻一种矿井电网漏电保护的新途径。 针对矿井电网漏电特征机理不甚明确的问题，本论文搭建了附加直流源低压矿井电网漏电模型，对附加直流源低压矿井模型暂态特征进行了详细的分析，揭示了附加直流源系统故障暂态过程中的部分特征规律，分析给出了交流作用下各个支路的故障瞬时零序电流、直流作用下各个支路的故障瞬时零序电流、交直流共同作用下各个支路的故障瞬时零序电流等单相漏电特征数学动态表达式，从而使附加直流源矿井低压电网故障瞬时得到了定量的估计。理论分析以及大量的仿真分析得出结论，在故障初始阶段，故障支路与非故障支路零序电流中的直流分量差别较大，在复杂的暂态信号中提取直流分量，需研究快速可靠的合适方法。 针对复杂的暂态零序电流，需要准确可靠地提取其中的直流分量，本论文提出了利用最小二乘矩阵束算法来满足课题的要求。同时对选漏方法进行了构建，利用最小二乘矩阵束算法准确地得到各个支路在故障初始状态下零序电流中的直流分量，根据得到的直流分量来得到各个支路的绝缘电阻值，进而根据绝缘电阻值的大小来判定故障支路。从而达到了故障选漏的快速、准确可靠性以及普适性。 为了验证本论文提出故障选漏方法的可靠性，因此，本论文利用Matlab软件搭建附加直流源低压矿井仿真模型验证，本论文不仅仿真验证而且进行了试验验证，搭建模拟的附加直流源低压矿井实验平台，结果表明，该选漏方法快速、准确可靠以及普适性。

Leakage is not only one of the main forms in low-voltage power grid failure, And it is an important factor affecting the safety of power supply and personal safety in industrial and mining enterprises security .Therefore, it is urgent to solve the problem of accurate and reliable determination of leakage branch in the mine grid special environmental. Due to the leakage mechanism is more complicated, more influencing factors , and the leakage signal is weak ,feature is not obvious, Therefore, the leakage protection of mine power network is a difficult problem. In this paper, Based on the analysis of failure process, to explore a new way of mine power leakage protection. Because the leakage characteristic mechanism of mine power network is not obvious, in this paper, set up an additional source of low-voltage direct current grid mine leakage model, to analysis the additional low-voltage DC source mine transient model features of the characteristics during failure, It reveals some characteristics of the transient process of the additional DC source system. the analysis shows the role of each branch of the AC instantaneous zero sequence fault current, fault transient zero sequence current role of each branch of DC, AC-DC interaction at each branch Road instantaneous fault zero sequence current leakage characteristics of single-phase dynamic mathematical expression, so that additional low voltage DC source grid fault of mine get instantaneous quantitative estimates. Theoretical analysis and lots of simulation analysis concluded that, in case of failure the initial state, the difference between the DC component of the fault slip and non-slip fault zero sequence current is greater, extract the DC component in a complex transient signals, the need to study fast reliable suitable method. For complex transient zero sequence current, the need for accurate and reliable to extract the DC component, in this paper proposed the use of the least squares matrix beam algorithm to meet requirements of the subject. At the same time, the method of selecting leakage is constructed, based on the least square matrix algorithm beam accurately get the slip under fault condition of the zero sequence current of dc component, According to the dc component for each branch of the insulation resistance value, So as to achieve the rapid and accurate reliability of fault selection leakage and universality. In order to verify this thesis proposes Faulty drain reliability of the method, therefore, this paper use Matlab software to build additional low voltage DC source mine simulation model, This paper not only simulation and test verification, Analog build additional low voltage DC source mine experimental platform, the results show that the selected leakage method is rapid, accurate and reliable, and universality.