矿用钢丝绳监测系统电磁干扰性耦合规律研究

针对目前矿用钢丝绳监测系统的抗干扰技术，缺乏可以参考和实施的电磁兼容性标准和规范，不能满足煤矿安全的技术发展需求，提出矿用钢丝绳监测系统电磁干扰性耦合规律研究。分析了矿用监测系统产品的测试项目和标准，得出要进行系统产品的抗干扰测试，首先要分析干扰源。为此建立了干扰源多导体传输线计算模型，运用有限差分法分别求解了传输线长度、动力电缆与监测信号线的间距等参数改变时信号回路S，L两端的差模干扰电压。结果表明：矿井电力电缆耦合到信号线上的干扰随传输导体长度的增加而增大；随动力电缆与信号线间距的增加而减小；随两信号线间距的增加而近似线性增大；随传输导体离地面间距的增加先增大后逐渐减小，存在一个最大干扰极值拐点。

Research on the coupling of electromagnetic interference in the monitoring system of coal mine wire rope

At present,there are no reference implementation standards of coal mine electromagnetic compatibility on the anti-interference technology of coal mine wire rope monitoring system,which cannot meet the technical requirements of coal mines.The research on the coupling of electromagnetic interference in the monitoring system of coal mine wire rope is proposed in this study.First of all,the testing items and standards of the products of the monitoring system are analyzed.And it is found that to test the anti-electromagnetic interference of the system,an interference source must be found.So the multi-conductor transmission line model of system interference source is established.The differential mode interference voltage of the S,L ends of signal loop is calculated respectively,when the length of the transmission line,the distance between power cable and signal line spacing and other parameters change.The results show that:the interference of coal mine power cable coupled to the signal line magnifies rapidly with the increase of the length of the transmission conductor；the interference coupled to the monitoring signal line decreases with the increase of the distance between the power cable and signal line；the interference linear approximation increases with the increase of the two signal line spacing；the interference increases firstly and then decreases with the increase of the distance of the transmission conductor from the ground,and there is a maximum interference inflection point.