110kV电缆在典型敷设条件下的温升特性试验研究

Experimental Study on Temperature Rise Characteristics of 110kV Cable under Typical Laying Conditions

为分析电缆在隧道、排管及直埋等典型敷设方式下线路温升及载流量的差异性,首先分析了电缆结构的发热特性及电缆典型敷设条件下的散热特性,随后通过试验分析在隧道、直埋和排管敷设条件下,同一根110kV电缆在相同试验电流条件下导体及外护套温升,比对分析隧道、直埋和排管敷设条件下电缆温升的差异性。试验结果表明,24h稳态电流条件下,排管敷设的电缆温升最高,散热效果最差;隧道条件下的电缆散热效果最好,排管中电缆的导体温升约为隧道中的2倍。由此可知,排管通常是电缆线路载流量的主要瓶颈点。

In order to analyze the difference between the temperature rise and the discharge of the cable lines in the typical laying modes of the cables,such as tunnel,pipe row and directly buried etc.,this paper first analyzed the heating characteristics of the cable structure and the characteristics of the cable heat dissipation in the typical laying conditions.The test was carried out to verify and analyze the same 110 kV cable under the conditions of tunnel,direct buried and pipe laying.The cable conductor and outer sheath temperature rise test under the same test current condition were compared to analyze the difference of the temperature rise of the cable,the direct buried and the pipe laying conditions.The experimental results showed that under the condition of 24h steady current,the temperature rise of the cable laying was the highest and the heat dissipation was the worst.The heat dissipation effect of the cable under the tunnel condition was the best.The temperature rise of the conductor in the tube was about 2 times than that of the tunnel.Therefore,piping was usually the main bottleneck for carrying capacity of cable lines.