Abstract：For single-phase earth fault in non-utility grounded system of distribution network, a single protection algorithm can not fully meet the reliability and sensitivity requirements of the status of line selection. Thus fuzzy theory is applied to the fault line selection in the paper. First it analyzes the electrical characteristics of single-phase earth fault. Then it choices a comprehensive line selection criterion as following: zero sequence current amplitude method, the basis of the fifth harmonic method, the zero-order energy method and the Wave Wavelets maximum value method. Furthermore it establishes each line selection method fault measures and combinational weight using least-squares. Eventually it uses the method based on fuzzy comprehensive multi-criterion decision-making to choose fault line. At last, a 10 kV distribution networks simulation model is set up by Matlab. Fault location, fault close initial angles and transition resistance are simulated to demonstrate the feasibility and improvement of selection accuracy in the theory.
吴文胜, 聂一雄. 基于模糊综合评价的小电流接地故障选线研究[J]. 电气技术, 2013, 14(04): 11-15.
Wu Wensheng, Nie Yixiong. Research on Single-phase Earth Fault Line Selection in Non-utility Grounded System Based on Fuzzy Comprehensive Evaluation Algorithm. Electrical Engineering, 2013, 14(04): 11-15.
2013, Vol. 14 
