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电缆隧道内的电力电缆会对巡检机器人用漏泄通信电缆产生电磁影响,然而国内外关于该领域的研究尚属于空白,因此根据电缆隧道的实际情况研究了巡检机器人通信线路在高压电缆隧道中的容性耦合影响。从电磁场基本理论出发,基于镜像法建立了1种计算电缆隧道内电力电缆线路对通信电缆线路电场干扰的方法,研究了单线电力电缆线路、三相电力电缆线路与通信线路间的容性耦合,并计算分析了单线电力电缆线路和典型布线方式下三相电力电缆线路对通信电缆线路的危险影响,最后以北京某地区一回地下电缆隧道为例,对通信线路感应电流进行了理论分析与现场测试,验证了该方法的正确性。结果表明:单线电力线路对通信线路的容性耦合影响较大,三相电力线路对通信线路的容性耦合影响较单线电力线路有所降低,但均超过国标规定的容许值,因此有必要将通信电缆外皮层进行接地处理,起到静电屏蔽的作用。通过分析两线路间的容性耦合,能够为电缆隧道通信线路的设计提供依据,对电缆隧道机器人巡检自动化的发展提供指导。
However, the researches in this area are still blank in the world. Therefore, according to the actual situation of the cable tunnel, it is studied that the inspection robot communication line is in the tunnel of high voltage cable The capacitive coupling effect. Based on the basic theory of electromagnetic field, a method for calculating the electric field interference of cable lines in telecommunication tunnels based on image method is established. The capacitive coupling between single-line power cable lines, three-phase power cable lines and communication lines is studied. Finally, taking the first underground cable tunnel in a certain area of Beijing as an example, the induced current of the communication line is analyzed theoretically and the on-site analysis of the three-phase power cable line in the single cable power line and the typical wiring mode is given. Test, verify the correctness of the method. The results show that the capacitive coupling of single-line power lines has a greater impact on the capacitive coupling of communication lines. The capacitive coupling effect of three-phase power lines on the communication lines is lower than that of single-line power lines, but all exceed the allowable values stipulated by the national standard. Therefore, Grounding of the communication cable outer layer, play the role of electrostatic shielding. By analyzing the capacitive coupling between two lines, it can provide a basis for the design of cable tunnel communication lines and provide guidance for the automation development of cable tunnel robot inspection.