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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.
Based on the impedance detection model of high-voltage power metering system, aiming at the problem of measuring the saturation of transformer when the load is large, a high-quality frequency-frequency core transformer with minimum saturation is chosen under the same condition of other parameters of the circuit. Of the secondary circuit debugging, through a large number of tests to determine the optimal parameters of the circuit to optimize the detection circuit to minimize the impedance of the transformer secondary circuit to measure the transformer core to reduce the flux, weakening the saturation Phenomenon.According to the design of FIR filter, the detection signal is extracted from the fault signal which is affected by the saturation of the measuring transformer. The actual test shows that the fault can be identified accurately and effectively by the extracted detection signal.