摘要
电缆中间接头温度与运行状态密切相关,测量该温度可以为电缆状态检修及动态增容提供依据。为此,在10kV电缆中间接头冷缩预制件表面、保护铜壳、本体铜屏蔽层、线芯等典型测量点安装温度传感器,对比分析不同形式阶跃电流作用下各测量点温度响应曲线与电流之间的关系。研究结果表明,冷缩预制件表面温度受环境温度影响小,暂态电流作用下与线芯温度变化的延时较小,适合作为中间接头的温度测量点。以冷缩预制件表面温度测量值为原始数据,使用ANSYS软件构建中间接头的温度场仿真模型,在校正模型不确定参量的基础上计算线芯的稳态温度,计算值与实测值之间的计算相对误差最大值为3.9%;基于BP神经网络算法,以冷缩预制件表面温度测量值作为输入量预测线芯温度,计算值与实测值之间的计算绝对误差最大值为3.3°C,满足工程应用的要求。
For a power cable,the temperature of its joint is closely related to its running state,thus measuring the temperature provides the basis for the cable’s state maintenance and dynamic capacity enhance.We installed temperature sensors on different parts of a 10 kV cable,including the surface of prefabricated joint,the copper shell,the copper shield of cable body,and the conductor core,and the temperature response curves of these sensors with different step current forms were obtained and comparatively analyzed.The results show that the temperature of the surface of the prefabricated cable joint is less influenced by environmental temperature,and can react faster to the temperature change of conductor core,therefore,it is more suitable to install temperature sensors on the surface of prefabricated cable joint.Then a temperature model of cable joint was established by the software ANSYS with some uncertain parameters calibrated,and the steady state temperature of conductor core was calculated with measured surface temperature as raw data;the maximum error between calculated value and measured value was 3.9%.Moreover,with the measured temperature of the surface of prefabricated cable joint as input,the transient temperature of conductor core was estimated based on the BP neural network algorithm,and the maximum error between the estimated value and the measured value was 3.3°C,meeting requirements of engineering application.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2013年第5期1156-1162,共7页
High Voltage Engineering
基金
国家重点基础研究发展计划(973计划)(2009CB724508)~~
关键词
中间接头
阶跃电流
温度测量
传感器
稳态温度
暂态温度
cable joint
step current
temperature measurement
sensor
the steady state temperature
transient temperature
