【摘要】：隨著用電負(fù)荷的增加及中國城市化的發(fā)展,越來越多的電力負(fù)荷需要用電力電纜來輸送。同時(shí)由于城市的擴(kuò)張以及對城市建設(shè)空間和市容市貌的考慮,越來越多的架空線路被電纜線路取代,使地下電纜輸電線路越來越密集,線路互耦合的問題也越來越嚴(yán)重。雖然電纜結(jié)構(gòu)較裸導(dǎo)線而言具有較好的屏蔽性能,但是由于地下電纜隧道空間有限,電纜線路之間的距離較近,線路間互相耦合的作用也較明顯,因而引起的問題也不容忽視。并且電纜并行線路互相耦合缺乏研究,需要進(jìn)一步探索。本文闡述了電磁耦合的基本原理以及感應(yīng)量,利用PSCAD/EMTDC仿真軟件建立雙回交流電纜線路與單回直流電纜線路共隧道敷設(shè)的耦合模型,研究了交流電纜線路運(yùn)行電壓、交流電纜線路運(yùn)行電流、交直流電纜線路敷設(shè)距離以及交直流電纜線路并行長度對金屬護(hù)層電磁感應(yīng)電流、電磁感應(yīng)電壓、靜電感應(yīng)電流、靜電感應(yīng)電壓的影響規(guī)律。介紹了直流偏磁現(xiàn)象以及導(dǎo)致偏磁直流產(chǎn)生的各類原因,闡述交流回路在雙極直流回路中感應(yīng)出的工頻電流經(jīng)過換流器產(chǎn)生直流分量的原理。利用PSCAD/EMTDC建立單回雙拼交流電纜線路與雙極直流電纜線路共隧道敷設(shè)的耦合模型,計(jì)算并比較交流電纜與直流電纜在不同的敷設(shè)方案下直流電纜回路中產(chǎn)生的感應(yīng)電壓。根據(jù)偏磁電流與感應(yīng)電壓成正比,得出回路中感應(yīng)電壓最小時(shí)的敷設(shè)組合與相序?qū)?yīng)的方案為最佳敷設(shè)方案。闡述了金屬護(hù)層屏蔽的基本原理并分別研究金屬護(hù)層接地方式、電阻率、厚度以及位置對電磁感應(yīng)屏蔽的影響。比較交流電纜線路分別在50Hz和60Hz工作頻率下金屬護(hù)層接地方式、電阻率、厚度以及位置對電磁感應(yīng)屏蔽的影響。
[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.
【學(xué)位授予單位】：廈門理工學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM75

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