矿井电力线对信号电缆串扰的不确定度量化

Uncertainty quantification of crosstalk between coal mine power lines and signal cables

煤矿井下大型电气设备在正常和异常运行下产生的浪涌骚扰会在监控系统的信号电缆上感应出电压和电流,可能覆盖来自各传感器的监控信号,导致信息失真,严重时可能会给电气设备及人员的安全带来威胁。本文建立了电力线对信号电缆的电磁干扰计算模型,应用时域有限差分方法(FDTD)分别计算了电缆布置方式和电缆参数对信号电缆首末端干扰电压的影响规律。考虑输入参数的不确定性,基于多项式混沌展开法(PCE)构建了信号电缆串扰响应的不确定度量化模型,以蒙特卡罗方法(MC)的结果为参考,验证了PCE方法的有效性。基于不确定度量化模型计算得到了信号电缆首末端响应电压最大值的95%置信区间、均值和方差等统计信息,最后基于PCE的方差分解法研究了响应电压对各输入参数的敏感度。研究结果可为煤矿井下监控系统信号电缆浪涌干扰的防护提供一定的指导。

Surge disturbance caused by large-scale electrical equipment in coal mines will induce voltage and current on the signal cables.The monitoring signals of each sensor may be covered by the induced voltage and current,which will result in information distortion,and in serious cases,the safety of electrical equipment and personnel will be threatened.In this paper,the calculation model of the electromagnetic interference of the power line to the signal cable is established.The influence of parameters,such as cable layout and cable parameters,on the interference voltage of the signal cable are analyzed based on the time-domain finite difference method(FDTD).The uncertain quantization model of the crosstalk response is constructed based on the polynomial chaotic expansion method(PCE).Compared with the results calculated by Monte Carlo method(MC),the validity of the PCE is verified.The 95%confidence interval,mean value and variance of the interference voltage on the signal cable are obtained,and the sensitivity of the interference voltage to each parameter is studied by the variance decomposition method.The results can provide some guidance for the protection of signal cable surge interference in coal mine monitoring system.