本文關(guān)鍵詞： 中間接頭 kV電纜線路 載流能力 熱路法 溫升實(shí)驗(yàn) 軸切面幾何模型　出處：《高電壓技術(shù)》2017年05期 　論文類型：期刊論文

【摘要】：為了評(píng)估110 kV電壓等級(jí)電纜中間接頭的載流能力,采用熱路法分析了中間接頭與電纜本體的徑向?qū)岵町?及中間接頭軸向傳熱的影響范圍�；诶碚摲治�,建立了有限長(zhǎng)中間接頭1/2軸切面幾何模型,利用有限元仿真工具,迭代計(jì)算了中間接頭載流量。模擬空氣敷設(shè)環(huán)境,進(jìn)行了大電流溫升實(shí)驗(yàn),得到了中間接頭局部溫度分布規(guī)律。研究結(jié)果表明:中間接頭徑向溫差大于電纜本體徑向溫差,對(duì)應(yīng)中間接頭徑向熱阻大于電纜本體徑向熱阻;中間接頭軸向傳熱影響范圍小,靠近中間接頭的電纜本體導(dǎo)體溫度軸向分布均勻;隨著負(fù)荷增大,中間接頭與電纜本體的導(dǎo)體溫差增大;空氣敷設(shè)環(huán)境下,考慮中間接頭的110 kV電纜線路載流量降低145 A;采用有限長(zhǎng)軸切面幾何模型仿真計(jì)算中間接頭導(dǎo)體溫度,計(jì)算相對(duì)誤差小于6%。該研究結(jié)果可以為電力調(diào)度及運(yùn)行維護(hù)部門考量電纜中間接頭對(duì)110 kV電纜線路載流量的限制作用提供參考。
[Abstract]:In order to evaluate the current carrying capacity of 110kV voltage grade cable intermediate joints, the radial heat conduction difference between the intermediate joints and the cable body was analyzed by using the hot path method. Based on the theoretical analysis, the geometric model of the 1/2 axis section of the finite-length intermediate joint is established, and the finite element simulation tool is used. The load flow rate of the intermediate joint is calculated iteratively. The temperature rise experiment of high current is carried out by simulating the air laying environment. The results show that the radial temperature difference of the intermediate joint is larger than the radial temperature difference of the cable body, and the radial thermal resistance of the intermediate joint is larger than that of the cable body. The influence range of axial heat transfer of the intermediate joint is small, and the temperature distribution of the conductor of the cable body near the intermediate joint is uniform. As the load increases, the conductor temperature difference between the intermediate joint and the cable body increases. Under the condition of air laying, the carrier current of 110kV cable line with intermediate connection is reduced by 145A; The conductor temperature of the intermediate joint is simulated by using the finite axial tangent geometry model. The calculated relative error is less than 6. The research results can be used as a reference for power dispatching and operation maintenance departments to consider the limiting effect of cable intermediate connection on the current carrying capacity of 110 kV cable lines.
【作者單位】： 華南理工大學(xué)電力學(xué)院;廣州供電局有限公司輸電管理所;廣東省電機(jī)工程學(xué)會(huì)電纜專委會(huì);
【基金】：國(guó)家高技術(shù)研究發(fā)展計(jì)劃(863計(jì)劃)(2015AA050201)~~
【分類號(hào)】：TM75
【正文快照】： 0引言1中間接頭是電纜線路必備附件之一,其性能好壞關(guān)系到電纜線路的安全穩(wěn)定運(yùn)行[1-3]。溫度是反映電纜中間接頭運(yùn)行狀況的重要參數(shù)。過熱運(yùn)行不僅會(huì)加速交聯(lián)聚乙烯(XLPE)絕緣老化,縮短接頭使用 壽命,而且會(huì)降低硅橡膠應(yīng)力錐電氣性能,導(dǎo)致接頭內(nèi)部電場(chǎng)分布集中,增大接頭電擊

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