CAJ | 학술논문

对于小电流接地系统的35 kV及以下的变电站系统，由于综合自动化的应用，其接地选线可以采用微机保护装置及监控系统实现。提出了利用微机保护装置实现小电流接地选线的检测原理，给出了以Modbus为总线的变电站监控系统的选线方案。应用小波变换方式从暂态故障电流中提取故障特征，可以提高故障选线的精度和可靠性。可以优化变电站的结构，减少二次电缆，节省空间，提高接地选线的正确性。
대우소전류접지계통적35 kV급이하적변전참계통，유우종합자동화적응용，기접지선선가이채용미궤보호장치급감공계통실현。제출료이용미궤보호장치실현소전류접지선선적검측원리，급출료이Modbus위총선적변전참감공계통적선선방안。응용소파변환방식종잠태고장전류중제취고장특정，가이제고고장선선적정도화가고성。가이우화변전참적결구，감소이차전람，절성공간，제고접지선선적정학성。
For 35 kV and below substation system of small current grounding systems,due to the application of integrated automation,the grounding line selection can be realized by the microcomputer protection device and monitoring system.This paper proposes the detection principle of small current grounding line selection realized through the microcomputer protection device,and gives the line selection scheme of the substation monitoring system using Modbus.By using wavelet transform to extract fault characteristics from transient fault current.We can improve the accuracy and reliability of fault line selection.This scheme can optimize the substation structure,reduce secondary cables,save space and improve the correctness of grounding line selection.