复杂环境地埋电缆群暂态温升热路模型适应性仿真验证研究  

Research on Adaptability Simulation Validation of Transient Temperature Rise Thermal Circuit Model for Buried Cable Group Under Complex Environment

作　　者：傅晨钊 司文荣 杨剑[2] 梁永春[3] FU Chenzhao;SI Wenrong;YANG Jian;LIANG Yongchun(State Grid Shanghai Electrical Power Research Institute,Shanghai 200437,China;Xi’an Jiaotong University,Xi’an 710049,China;Hebei University of Science and Technology,Shijiazhuang 050018,China)

机构地区：[1]国网上海市电力公司电力科学研究院,上海200437 [2]西安交通大学,西安710049 [3]河北科技大学,石家庄050018

出　　处：《高压电器》2024年第8期139-146,共8页High Voltage Apparatus

基　　金：国家电网公司科技项目(地埋(直埋、排管)电缆群温升快速算法研究与示范应用)。

摘　　要：简易可行、快速准确地评估电缆实时温升,是释放潜在输送能力,提高运行效率的基础。目前,评估电缆线芯温升的方法主要有测量方法与计算方法,借鉴热电比拟的方法,提出了引入平衡热阻与平衡热感的电缆群暂态温升热路模型。然而实际运行中,电缆的运行环境更为复杂,电缆回数多少、负荷波动程度等因素也可能影响模型的准确性。为充分验证热路模型的适应性,文中通过构建一个复杂环境、工况条件下的电缆群暂态温升有限元算例,并与热路模型结果进行比较。验证结果表明,针对不同影响因素,原有热路模型可进行灵活调整扩展,参数求解方法不变,模型的便捷性与准确性不受影响;电缆回数数量、介质均匀性、负荷波动程度、日照与环温变化幅度均不明显降低模型的准确性。研究成果不仅验证了模型的适应性,而且可为类似模型的检验方法提供重要参考。Simply,feasibly,quickly and accurately assessing the real time temperature rise of cable is the base to release potential transmission capacity and improve operation efficiency.At present,the methods for assessing the temperature rise of cable core mainly includes measurement and calculation methods.The thermal circuit model of transient temperature rise of cable group introducing balance thermal resistance and thermal sensitivity is proposed with reference to the thermoelectric analogy method.However,in practical operation,the operating environment of the cable is much more complex.Such factors as the number of cable loop number and magnitude of load fluctuation may likely affect the accuracy of the mode.For fully validating the adaptability of the thermal circuit model,a finite element calculation example of the transient temperature rise of cable group is constructed at a complex environment and condition in this paper and compared with the thermal circuit model result.The verification result shows that,for different impact factors,the original thermal circuit model can be adjusted and extended flexibly without change of the parameter solving method and both convenience and accuracy of the model are free from influence.The loop number of cable,medium uniformity,load fluctuation magnitude,sunshine and environmental temperature variation do not remarkably reduce the accuracy of the model.The research results not only verify the model,but also provide an important reference for the test method of similar models.

关 键 词：电缆群 暂态温升 热路模型 

分 类 号：TM75[电气工程—电力系统及自动化]