CAJ | 학술논문

首先从理论上分析了中性点经消弧线圈接地的小电流接地系统(谐振接地系统)发生单相接地故障时,故障暂态持续时间内健康馈线和故障馈线的零序电荷与零序电压的关系特征.其次通过仿真分析了不同接地电阻、不同故障距离、混合线路和噪声干扰等各种工况对零序电荷-零序电压关系特征的影响.仿真结果表明,健康馈线零序电荷-零序电压呈直线关系,故障馈线则不满足直线关系.利用零序电荷-电压关系特征可以快速明显地区分健康馈线和故障馈线,为选线提供有效依据.
수선종이론상분석료중성점경소호선권접지적소전류접지계통(해진접지계통)발생단상접지고장시,고장잠태지속시간내건강궤선화고장궤선적령서전하여령서전압적관계특정.기차통과방진분석료불동접지전조、불동고장거리、혼합선로화조성간우등각충공황대령서전하-령서전압관계특정적영향.방진결과표명,건강궤선령서전하-령서전압정직선관계,고장궤선칙불만족직선관계.이용령서전하-전압관계특정가이쾌속명현지구분건강궤선화고장궤선,위선선제공유효의거.
When a single-phase ground fault takes place in small current grounding system with neutral point grounding through the arc suppression coil, namely a resonant grounding system, the charge-voltage relationship of sound feeder and faulty feeder in fault transient time is analyzed. This characteristics’ performance under various working conditions such as different grounding resistance, different fault distance, mixed lines and noise is analyzed by simulation. The results show that the zero-sequence charge is linear with the zero-sequence voltage in sound feeders while there is no linear relationship in fault feeders. In addition, these characteristics of the charge-voltage relationship can be used to distinguish sound feeder from faulty feeder rapidly and evidently. It provides an effective basis for the line selection.