带电作业时同塔四回输电线路电场仿真分析

发布时间：2017-12-27 00:04

本文关键词：带电作业时同塔四回输电线路电场仿真分析　出处：《长沙理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着社会经济的飞速发展和城镇工业化进程的加快,电能需求也快速增长,特别是人口稠密、经济发达的中东部地区,建设用地资源日益匮乏,如何实现电力需求与电力输送的均衡发展成为亟需解决的问题。为有效解决电力输送与输电线路走廊紧缺、实现经济高效的电力能源输送,同塔并架双回、同塔多回、特高压交流、交直流混合输送等电力输送方案得到了广泛关注和采用。论文结合同塔多回输电线路的特点,以220/110kV同塔四回混压输电线路为研究对象,利用ATP-EMTP和ANSYS软件对检修线路上感应电压、电流以及检修作业人员周围电场强度进行仿真分析。首先绪论部分介绍了课题研究背景及意义、国内外关于同塔多回输电线路以及带电作业的发展和研究现状,并对检修作业中需要考虑的感应电压、电流以及作业人员体表场强的理论及其原理进行详细介绍;建立模型时,充分考虑同塔多回输电线路的实际情况,根据作业人员、线路及杆塔的实际参数建立仿真模型;研究停运方式、线路运行电流、导线相序排列、导线水平间距、导线回路间距等因素对检修线路感应电压、电流大小的影响,临时接地线间距对流过作业人员感应电流大小的影响,以及不同运行工况下杆塔典型作业位置的作业人员周围场强分布及其变化规律。研究结果表明,线路运行电流主要影响检修线路的电磁感应分量,对静电感应分量基本无影响;同相序时检修线路感应电压、电流值最大,逆相序次之,异相序最小;随着导线水平间距和回路间垂直间距的增大,线路间耦合程度减小,感应电压、电流均会降低;当检修位置两侧挂临时接地线时,作业人员仍要承受较大的感应电流,为保证人员安全需在检修点挂临时接地线;对于同塔多回输电线路,当部分回路进行检修、其他回路正常运行时,部分作业位置的场强远高于人体皮肤感知水平,应严格按照等电位方法进行检修,穿戴全套屏蔽服,进入等电位时采用绝缘软梯、硬梯、吊篮等工器具。根据上述结果,对选择合适的接地开关、带电作业时安全防护措施的制定以及作业方法有一定参考意义。
[Abstract]:With the rapid development of social economy and urban industrialization, energy demand is also growing rapidly, especially in densely populated and economically developed eastern regions, construction land increasingly scarce resources, how to realize the power demand and power transmission of the balanced development becomes an urgent problem to solve. In order to effectively solve the shortage of power transmission and transmission line corridors, and achieve economic and efficient power and energy transmission, power transmission schemes such as the same tower, double circuit, multi tower, ultra high voltage AC, AC and DC hybrid transmission have been widely concerned and adopted. Based on the characteristics of multi circuit transmission lines on the same tower, taking the 220/110kV four tower mixed transmission line on the same tower as the research object, ATP-EMTP and ANSYS software are used to simulate and analyze the induced voltage and current and the electric field intensity around maintenance workers. First, the introduction part introduces the research background and significance, at home and abroad on the multi circuit transmission lines on same tower and live working on the development and research status quo, and carries on the detailed introduction to the need to consider the maintenance of induction voltage, current and operating personnel surface field strength theory and its principle; to set up the model, fully consider the actual situation with the transmission line back to the tower, simulation model is established according to the actual parameters of line and tower operators, the effect of operation; line operation, current, wire, wire sequence level spacing, wire loop spacing and other factors on the maintenance of the line induced voltage and current, temporary grounding line spacing effect on the current through the operating personnel the electric field distribution and its variation around and under different operating conditions of tower typical work site workers. The results show that the electromagnetic induction component maintenance line line running current main influence, no influence on the electrostatic induction component; the same phase induction voltage and current maximum line maintenance, reverse phase sequence of minimum phase sequence; with the increase of the vertical spacing between the horizontal spacing and wire loop line, the coupling degree between induction decreases. The voltage and current will be reduced; when the maintenance position hanging off the sides of temporary grounding line, workers still under induction current is large, to ensure the safety of personnel in the maintenance point hanging temporary grounding line; for multi circuit transmission lines on same tower, when the circuit overhaul and other circuits during normal operation, part of the job position the field is much higher than that of the human skin perception level, should be strictly in accordance with the potential method for maintenance, wearing full shield clothing, into the insulating ladder, rigid ladder and basket work with potential Out. According to the above results, it is of certain reference significance for the selection of appropriate grounding switches, the formulation of safety protection measures in live work and the operation methods.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM75;TM743

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