CAJ | 학술논문

谐振接地系统单相接地故障特征信息微弱,现有采用单一故障特征信号的选线方法难于实现可靠选线.综合考虑暂态零序电流能量比、零序有功功率比、负序电流变化量比等三种单一故障特征选线方法的互补性,针对谐振接地系统提出采用多人工神经网络对单相接地暂稳态信息进行融合的选线方法.区分稳定接地及非稳定接地,分别采用不同的融合方案.大量仿真验证该选线方法受接地位置、接地发生时刻、接地过渡电阻大小等因素的影响较小,适用于各种单相接地情况,具有较高的选线鲁棒性.
해진접지계통단상접지고장특정신식미약,현유채용단일고장특정신호적선선방법난우실현가고선선.종합고필잠태령서전류능량비、령서유공공솔비、부서전류변화량비등삼충단일고장특정선선방법적호보성,침대해진접지계통제출채용다인공신경망락대단상접지잠은태신식진행융합적선선방법.구분은정접지급비은정접지,분별채용불동적융합방안.대량방진험증해선선방법수접지위치、접지발생시각、접지과도전조대소등인소적영향교소,괄용우각충단상접지정황,구유교고적선선로봉성.
@@@@The feature information of single phase grounding fault occurring in resonant grounding system is weak. The existing line selection based on single-fault-characteristic is difficult to achieve reliable line detection. The complementarity of three kinds of line selection methods based on single-fault-characteristic such as energy ratio of zero-sequence current, zero-sequence active power ratio and variation ratio of negative-sequence current is comprehensively considered. A new method using multiple neural networks to fuse transient and steady-state characteristics is proposed for fault line detection in the resonant grounding system. Different integration programs have been taken respectively to distinguish the differences between stable and unstable ground fault. Lots of simulation results verify that the proposed method for fault line detection is less affected by grounding location, grounding time and grounding resistance. With good robustness, it can be applied to detect fault line under all kinds of single phase grounding conditions.