CAJ | 학술논문

谐振接地系统不同类型单相接地故障的暂态过程差异性较大，难有普适的暂态选线方法。分析谐振接地系统在三种典型故障条件下的暂态特征，将单相接地故障类型分为强接地故障、小角度接地故障和弱接地故障；定义频谱能量比例因子P、暂态因子T和Hilbert时频熵S等故障特征量，并采用支持向量机对故障进行分类。对不同类型的故障构造相应的选线判据，实现有针对性的接地选线。仿真结果表明，该选线方法能适应各种故障条件及影响因素，具有选线准确、裕度高等特点。
해진접지계통불동류형단상접지고장적잠태과정차이성교대，난유보괄적잠태선선방법。분석해진접지계통재삼충전형고장조건하적잠태특정，장단상접지고장류형분위강접지고장、소각도접지고장화약접지고장；정의빈보능량비례인자P、잠태인자T화Hilbert시빈적S등고장특정량，병채용지지향량궤대고장진행분류。대불동류형적고장구조상응적선선판거，실현유침대성적접지선선。방진결과표명，해선선방법능괄응각충고장조건급영향인소，구유선선준학、유도고등특점。
The transient processes of different types signal-phase-to-earth fault in resonant grounded system are dif-ferent, thus it is very difficult to find a generally applicable method .By analyzing the transient characteristic of res-onant grounded system in three special fault conditions , the single-phase-to-earth fault is divided into strong ground-ed fault, small-angle grounded fault and weak grounded fault .Define spectrum energy scaling factor P, transient factor T and Hilbert time-frequency entropy S as the fault characteristics , and use support vector machine to classify fault category .Build up the proper line detection criterions for different fault categories to achieve targeted ground-ing line detection .Simulation results show that the proposed approach for fault line detection could adapt to various fault conditions and influence factors and has the characteristics of high margin and veracity .