Single-phase Grounding Fault Section Locating Technology for Distribution Network Based on Rough Set Algorithm

With the continuous development of distribution networks, the proportion of the power electronic equipment that accesses distribution networks is increasing, which increases the system capacitance current, making the probability of single-phase grounding fault via intermittent arc in the system significantly increased. However, most traditional locating technologies are suitable for single grounding fault type via stable resistance, and cannot locate the fault above, which seriously impairs the reliability of the power supply of distribution networks. In order to solve the problem above, this paper puts forward the single-phase grounding fault section locating technology for the distribution network based on a rough set algorithm. This technology is able to obtain the phase current signals in the system for judgment, and analyze multiple characteristics of current signals with a rough set algorithm, thus determining the fault types in the system correctly. Moreover, it is also able to determine fault sections with proper section locating algorithms based on different fault types. Furthermore, it is able to locate sections of various fault types, such as resistance fault and fault via intermittent arc, with an expanded feasible region. Besides, it only makes a judgment based on phase current without collecting the zero-sequence voltage of the system, ensuring adaptability. Additionally, it is able to supplement and optimize fault type identification categories by adding condition attributes of fault characteristic analysis in the rough set algorithm, having certain engineering application values. In the end, the feasibility of this locating technology was verified with ATP power system simulation software.