交流电缆线路对并行直流电缆线路的电磁感应研究

发布时间：2018-07-30 07:34

【摘要】：随着用电负荷的增加及中国城市化的发展,越来越多的电力负荷需要用电力电缆来输送。同时由于城市的扩张以及对城市建设空间和市容市貌的考虑,越来越多的架空线路被电缆线路取代,使地下电缆输电线路越来越密集,线路互耦合的问题也越来越严重。虽然电缆结构较裸导线而言具有较好的屏蔽性能,但是由于地下电缆隧道空间有限,电缆线路之间的距离较近,线路间互相耦合的作用也较明显,因而引起的问题也不容忽视。并且电缆并行线路互相耦合缺乏研究,需要进一步探索。本文阐述了电磁耦合的基本原理以及感应量,利用PSCAD/EMTDC仿真软件建立双回交流电缆线路与单回直流电缆线路共隧道敷设的耦合模型,研究了交流电缆线路运行电压、交流电缆线路运行电流、交直流电缆线路敷设距离以及交直流电缆线路并行长度对金属护层电磁感应电流、电磁感应电压、静电感应电流、静电感应电压的影响规律。介绍了直流偏磁现象以及导致偏磁直流产生的各类原因,阐述交流回路在双极直流回路中感应出的工频电流经过换流器产生直流分量的原理。利用PSCAD/EMTDC建立单回双拼交流电缆线路与双极直流电缆线路共隧道敷设的耦合模型,计算并比较交流电缆与直流电缆在不同的敷设方案下直流电缆回路中产生的感应电压。根据偏磁电流与感应电压成正比,得出回路中感应电压最小时的敷设组合与相序对应的方案为最佳敷设方案。阐述了金属护层屏蔽的基本原理并分别研究金属护层接地方式、电阻率、厚度以及位置对电磁感应屏蔽的影响。比较交流电缆线路分别在50Hz和60Hz工作频率下金属护层接地方式、电阻率、厚度以及位置对电磁感应屏蔽的影响。
[Abstract]:With the increase of electricity load and the development of China's urbanization, more and more power loads need to be transported by electric power cables. At the same time, more and more overhead lines are replaced by cable lines because of the expansion of cities and the consideration of urban construction space and city appearance, so that the transmission lines of underground cables are more and more dense and the lines are coupled to each other. The problem is more and more serious. Although the cable structure has better shielding performance than the bare wire, the space between the underground cable tunnel is limited, the distance between the cable lines is relatively close, the interaction between the lines is more obvious, and the problems caused by the cables can not be ignored. And the coupling of the cable parallel lines is lack of research, It needs further exploration. This paper expounds the basic principle of the electromagnetic coupling and the induction quantity, and uses the PSCAD/EMTDC simulation software to establish the coupling model of the common tunnel laying with the double circuit AC cable line and the single back DC cable line, and studies the operating voltage of the AC cable line, the running current of the AC cable line and the laying distance of the AC and DC cable lines. The influence of the parallel length on the electromagnetic induction current, electromagnetic induction voltage, electrostatic induction current and electrostatic induction voltage is introduced. The phenomenon of DC bias and the causes of the production of the magnetic bias DC are introduced, and the induction frequency current in the AC circuit is replaced by the commutation of the induction frequency current in the double pole DC circuit. The principle of the DC component is produced by the device. The coupling model of the common tunnel of the single back double spelling AC cable line and the bipolar DC cable line is established by using PSCAD/EMTDC, and the induction voltage produced in the DC cable circuit is calculated and compared with the AC cable and the DC cable in different laying schemes. In this paper, the basic principle of shielding of metal shielded layer is expounded and the influence of metal shield grounding mode, resistivity, thickness and position on electromagnetic induction shielding are discussed respectively. The comparison of AC cable lines at 50Hz and 60Hz frequency is obtained. The influence of the grounding mode, resistivity, thickness and location of metal sheath on electromagnetic induction shielding is studied.
【学位授予单位】：厦门理工学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75

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