Research On Novel Leakage Protection For Mine Power

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.