【摘要】 基于高压电力计量系统阻抗检测模型,针对负荷较大时测量互感器发生饱和问题进行研究.在电路其他参数相同情况下,选取发生饱和程度最小的高品质工频铁心测量互感器.对测量互感器的二次回路进行调试,通过大量试验确定了电路的最优参数,优化了检测电路,最大限度地减小测量互感器二次回路阻抗,以降低测量互感器铁芯中主磁通,减弱饱和现象.通过设计FIR滤波器,将检测信号从受测量互感器饱和影响的故障信号中提取出来,实际测试表明通过提取的检测信号能够准确有效地判别故障.更多还原

【Abstract】 According to the resistance model of high voltage electric power metering system,and aiming at the occurrence of the saturation of CT when the load is high,we do research on the saturation of the measuring CT.Under the same condition of other circuit parameters,we do experiments on the secondary side of measuring current transformers and choose high-quality power frequency magnetic core of the least saturation.Through many experiments we determine optimal circuit parameters to optimize detecting circuits and reduce the resistance of the secondary side of CT to the utmost to weaken saturation.Through designing FIR digital filter we extract detection signal from the fault signal affected by the stauration of measuring CT to diagnose the fault.The practical test shows the extracted detection signal can accurately judge the faults.更多还原