摘要
最大限度的利用电力电缆的输送容量一直是电缆设计、运行管理和电力调度所关注的问题。为了提高运行电缆的短时负荷载流量,对影响电缆导体温度的环境热阻和环境温度两个因素进行了局部灵敏度分析,并设计了110 kV交联聚乙烯单芯电缆土壤直埋、水中敷设、空气敷设3种条件下的阶跃电流温升试验,对试验数据进行分析发现:3种环境不同电流下,电缆达到稳态时,导体温度的变化受外界环境热阻的变化影响灵敏,3种环境下电缆线芯达到同样的温度,跟空气敷设电缆相比,水中敷设电缆载流量可以提高约33%,跟土壤直埋电缆相比,水中敷设电缆载流量可以提高约20%;导体温度的变化受外界环境温度的变化影响灵敏,降低外界环境温度,可以提高电缆载流量,且降低水中和土壤中的环境温度,电缆载流量提升的更明显。这对电力电缆载流量设计、电缆线路负荷优化和电力电缆运行管理以及相关工程实践具有参考意义。
In order to increase temporary ampacity of single-core cable,we analyzed the local sensitivity of factors（surroundings thermal resistance and ambient temperature）affecting the cable,designed temperature rising test for step current of 110 kV XLPE single-core cable,in which cable was buried in soil,under the water and laid in the air,and analyzed the experimental data.The results show that,under the steady state of the different load current for three kinds of surrounds,conductor temperature changes sensitively with the change of surroundings thermal resistance;for the same temperature response,cable ampacity buried under the water can be increased by 33% than that laid in the air,by 20% than that buried in soil;conductor temperature changes sensitively with the change of surroundings ambient temperature;if surroundings ambient temperature is lower,cable ampacity can be increased;especially if ambient temperature of soil or water is lower,cable ampacity will be elevated obviously.The conclusion can give a reference value for the design of power cable capacity,optimal load of cable lines,power cable operation and management,and related engineering practice.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2011年第5期1288-1293,共6页
High Voltage Engineering
基金
国家重点基础研究发展计划(973计划)(2009CB724507)~~
关键词
单芯电缆
线芯温度
试验研究
提高载流量
数据分析
局部灵敏度分析
single-core cable
conductor temperature
experimental research
ampacity elevation
data analysis
local sensitivity analysis
