【摘要】 对于煤矿电网单相接地故障,各种保护原理有自身适用的范围和缺陷,并且上下级保护的整定难以配合,导致煤矿高压电网单相接地保护无选择性。智能变电站能实现全站信息的共享,这为解决接地保护无选择问题提供了新的契机。将各支路零序全电流所在象限作为判断依据,对多支路信息综合保护判据进行了研究,PSCAD软件建模仿真证明了该方法能保证接地保护的横向选择性。对电网拓扑节点优化矩阵算法实现故障区段定位进行了研究,构造网络结构矩阵和故障信息矩阵,得到故障判断矩阵来判断故障所在区段,算例和PSCAD软件建模仿真证明了该方法的优越性。论述了基于煤矿智能变电站实现选择性接地保护的方案,包括区域集控式煤矿智能变电站结构和实现选择性接地保护的过程。更多还原

【Abstract】 Forsingle-phase grounding faults in coalmine high-voltage power network,application and deficiencies exist in grounding protection principles,also the valuation and time limit coordination of selective protection are not easy to be satisfied between upper-stage and lower-stage,so grounding protection act without selectivity. A share of the underlying data of the whole station can be realized by intelligent substation,which providing a new opportunity to resolve the problem of grounding protection act without selectivity. Using quadrants which the zero-sequence total currents in as judgment basis,comprehensive protection criterion using fault information collected from multi branches was studied in this paper,PSCAD simulation results have verified that this method can ensure the transverse selectivity. A fault section location method based on optimal matrix algorithm was studied in this paper,network structure matrix and fault information matrix were constructed first,then fault judgment matrix was calculated to judge fault section,the superiority of this method was proved by the numerical example and PSCAD simulation. The implementation scheme of selective grounding protection based on coalmine intelligent substation was discussed,including the structure of multi-area centralized control coalmine intelligent substation and the process of selective grounding protection realization.更多还原