基于线路参数灵敏度的EMTR配网故障定位性能影响分析OA

In this paper,an an electromagnetic time reversal fault location method based on the minimum mirror value of fault current energy is proposed.However,this method currently requires that the simulation model set up during the reverse stage to be consistent with the actual line model parameters at the time of the fault during the for-ward stage,which limits its practical application.Therefore,based on the discrepency in model parameters between the forward and reverse stages of this method,the PSCAD simulation software is used in this paper to set up a 10 kV dis-tribution network line model and its frequency-domain theoretical derivation is conducted.Through simulation,the loalization performance of this method under different line parameter sensitivities is analyzed,and a coaxial cable ex-perimental model is constructed for validation.The results show that:① When the line inductance parameters in the reversed stage are adjusted in the range of 0.95 times to 1.1 times compared to the line inductance parameters in the di-rect stage,the method is able to accomplish ground fault location with high resistance.②The method can achieve ac-curate location of the real occurrence of an unknown ground fault resistance,and it is suggested that a high-resistance fictitious ground fault can be set in the line's lateral branch in the reversed stage so to increase its overall location per-formance.③Using the constructed coaxial cable test model,the impact of unknown fault impedance on the fault loca-tion performance of the method is analyzed,with a maximum comprehensive fault localization error of 5 m.