發(fā)布時(shí)間：2018-12-25 07:54

【摘要】：為使電纜線路長期穩(wěn)定運(yùn)行，且能充分發(fā)揮其傳輸能力，準(zhǔn)確計(jì)算其載流量至關(guān)重要。影響電纜載流量的因素較多，尤其在多回路電纜集群敷設(shè)時(shí)，按照國際電工委員會(huì)（IEC）和國家標(biāo)準(zhǔn)應(yīng)用解析法計(jì)算電纜的載流量往往誤差較大。因此，研究基于計(jì)算機(jī)技術(shù)的電纜載流量核定新方法意義重大。 本文建立了基于有限元法的電力電纜電磁場和溫度場模型，考慮到導(dǎo)體電阻率與溫度有關(guān)，在計(jì)算功率損耗體密度的基礎(chǔ)上，建立了“電—熱”間接耦合二維有限元模型，并以此模擬仿真電力電纜的載流量。首先仿真計(jì)算了單回路電纜在不同敷設(shè)條件下的載流量，通過將仿真結(jié)果與解析法計(jì)算（按IEC－60287標(biāo)準(zhǔn)）比較，驗(yàn)證了采用有限元法計(jì)算電力電纜載流量有效、可行，結(jié)果準(zhǔn)確。在此基礎(chǔ)上，仿真分析了空氣溫度、土壤溫度、土壤熱阻系數(shù)、電纜埋設(shè)深度、相鄰電纜軸間距等因素對電纜的溫度場分布以及載流量的影響。然后，以集群敷設(shè)的兩回路和三回路電纜為研究對象，，仿真計(jì)算了在多回路平面排列和豎直排列時(shí)各電纜的載流量，對比了彼此間及與單回路敷設(shè)電纜間載流量的差異，分析了相關(guān)機(jī)理。 采用有限元法模擬仿真電纜的載流量，可以全面考慮諸多復(fù)雜的影響因素，計(jì)算結(jié)果對保證電纜的安全、經(jīng)濟(jì)運(yùn)行具有實(shí)際意義。
[Abstract]:In order to make the cable line run stably for a long time and give full play to its transmission capacity, it is very important to calculate the carrier current accurately. There are many factors affecting the cable load, especially in the multi-loop cable cluster laying, according to the (IEC) and the national standards of the International Electrotechnical Commission of the application of analytical method to calculate the cable load error is often large. Therefore, it is of great significance to study the new method of cable current checking based on computer technology. In this paper, the electromagnetic field and temperature field model of power cable based on finite element method is established. Considering that the resistivity of conductor is related to temperature, a two-dimensional finite element model of "electric-thermal" indirect coupling is established on the basis of calculating the volume density of power loss. The load current of power cable is simulated by this method. First, the load current of single loop cable under different laying conditions is calculated by simulation. By comparing the simulation results with analytical method (according to IEC-60287 standard), it is proved that the finite element method is effective and feasible to calculate the load current of power cable. The result is accurate. On this basis, the effects of air temperature, soil thermal resistance coefficient, cable embedding depth and the distance between adjacent cable axes on the temperature field distribution and load flow of the cable are simulated and analyzed. Then, taking the two-loop and three-loop cables laid in cluster as the research object, the load current of each cable in the multi-loop plane arrangement and vertical arrangement is simulated and calculated, and the difference of the carrier current between each other and between the single-loop laying cable is compared. The related mechanism is analyzed. The finite element method (FEM) is used to simulate the load current of the cable, and many complicated factors can be considered. The calculation results are of practical significance to ensure the safety and economic operation of the cable.
【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TM744

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