CAJ | 학술논문

指出了现有变电站直流电源绝缘监测没有直流电源系统历史信息等不足之处,提出基于智能传感器、零点滤波器等技术的直流电源绝缘在线监测新方法.该方法提出在各供电回路装设智能传感器检测故障漏电流,利用通信网络采集各漏电流信号送至监控主机,经过零点滤波器等数字信号处理手段去除干扰成分后,可有效地确定接地回路和接地点.监控主机还可实时监测各支路直流绝缘的变化,根据历史数据对绝缘下降趋势做出预测.提出了对漏电流采样值越限报警和电流变化量越限报警的判据,并对零点数字滤波进行了仿真,通过现场试验验证了所提出方法的正确性.
지출료현유변전참직류전원절연감측몰유직류전원계통역사신식등불족지처,제출기우지능전감기、영점려파기등기술적직류전원절연재선감측신방법.해방법제출재각공전회로장설지능전감기검측고장루전류,이용통신망락채집각루전류신호송지감공주궤,경과영점려파기등수자신호처리수단거제간우성분후,가유효지학정접지회로화접지점.감공주궤환가실시감측각지로직류절연적변화,근거역사수거대절연하강추세주출예측.제출료대루전류채양치월한보경화전류변화량월한보경적판거,병대영점수자려파진행료방진,통과현장시험험증료소제출방법적정학성.
The disadvantages of present insulation monitoring of substation DC power supply system are pointed out and an online insulation monitoring method based on intelligent sensor and zero-crossing filter is proposed for DC power supply.The fault leakage current is detected by the intelligent sensors installed on every power supply circuits,and then sent to the monitoring computer via communication networks,which are processed by zero-crossing filter to eliminate the interference components.The grounding circuit and point are then effectively determined.The DC insulation variation of each branch is also monitored in real time and its downward trend is forecasted based on the historical data.The alarm criteria of instantaneous current limit violation and current change rate violation are put forward.The zero-crossing filter is also simulated.The validity of the proposed method is proved by on-site test.