鋁合金電纜與銅電纜過(guò)載暫態(tài)溫升過(guò)程對(duì)比分析
劉杰1，梁經(jīng)龍1，郝靜亮1，黃位華1，張延輝2，藍(lán)磊2，王羽2
（1 中國(guó)能源建設(shè)集團(tuán)山西省電力勘測(cè)設(shè)計(jì)院有限公司，山西 太原 030073；2 武漢大學(xué) 電氣與自動(dòng)化學(xué)院，湖北 武漢 430072）
摘 要：以常見(jiàn)的水平排布的直埋單芯電纜為例，采用通過(guò)暫態(tài)熱路法和有限元法，在等載流量情況下，計(jì)算兩種電纜在突然過(guò)載后由90 ℃的穩(wěn)態(tài)運(yùn)行情況暫態(tài)向105 ℃的穩(wěn)態(tài)過(guò)渡過(guò)程中的熱時(shí)間常數(shù)，結(jié)果表明：相同的載流量時(shí)鋁合金電纜的熱時(shí)間常數(shù)大于銅電纜，即通過(guò)相同的時(shí)間，鋁合金電纜的溫升低于銅纜，暫態(tài)熱路法和有限元法計(jì)算結(jié)果接近，過(guò)載情況下鋁合金電纜具有較為優(yōu)良的性能。
關(guān)鍵詞：鋁合金電纜；銅電纜；暫態(tài)過(guò)程；熱時(shí)間常數(shù)
中圖分類(lèi)號(hào)：TM247 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1007-3175(2020)02-0027-04
Comparative Analysis of Transient Temperature Rise Process of Aluminum Alloy Cable and Copper Cable
LIU Jie1, LIANG Jing-long1, HAO Jing-liang1, HUANG Wei-hua1, ZHANG Yan-hui2, LAN Lei2, WANG Yu2
（1 Shanxi Electric Power Survey and Design Institute Co., Ltd, China Energy Engineering Group Co., Ltd, Taiyuan 030073, China;
2 School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China）
Abstract: Taking a common horizontally-displaced single-core cable for example, this paper adopted the steady-state thermal path method and the finite element method to calculate the thermal time constant of two kinds of cables in the transition process from the steady-state operation at 90 °C to the steady-state operation at 105 °C after the sudden overload under the same current carrying capacity conditions. The result shows that the thermal time constant of the aluminum alloy cable is greater than that of the copper cable under the same current carrying capacity, that is, the temperature rise of the aluminum alloy cable is lower than that of the copper cable through the same time. The calculation results of transient thermal path method are close to the finite element method and the aluminum alloy cable has better performance under overload conditions.
Key words: aluminum alloy cable; copper cable; transient process; thermal time constant
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