The impedance of foamed cement is lower compared to conventional cement. It may lead to wrong results to assess the coupling be - tween foamed cement and pipe from the amplitude of CBL.
与常规水泥相比，泡沫水泥声阻抗值较低，用CBL中的常规声幅曲线评价泡沫水泥与套管的胶结质量，可能会得出错误的解释结果。
Conventional impedance relay will refuse to trip according to an analysis of measuring impedance by means of impedance locus method when wrong-phase-coupling of traction power supply system occurs.
首先通过测量阻抗轨迹法对异相短路故障的测量阻抗的进行分析，得出牵引网发生异相高阻电弧短路故障时，常规原理的阻抗保护将拒动的结论。
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