Assessment of Thermal Condition and Current Rating of Underground Power Cables Installed in Duct Banks
摘 要
为了保证地下电缆可靠运行,电力部门通常的做法是在电缆表面安装温度传感器,对电缆的热状态进行直接监测。但是对于管道群中安装的电缆,如在安装时打碎已有管道既不安全也不经济,使温度传感器不得不安装在管道群的外表面,带来如何从远离电缆安装的温度传感器的数据中推测出电缆绝缘温度的问题。对此,提出了一种通过土壤热参数的估算来评估电缆绝缘热状态的方法,主要涉及有限元法和优化方法。通过实际应用于220 kV变电站入线的3条220 kV/250 MVA地下管道群电缆线路,对热状态进行精确评估,预测结果与实际测量值具有很好的一致性,证明了所提方法的有效性。
Abstract
For reliable operation of underground power cables, it has been a common practice that power utilities mount thermal sensors on cable surface to directly measure temperature and then assess the thermal conditions and ratings. However, this method could not be applied readily to those cables installed in duct banks due to the inconvenience in mounting sensors on cable surface. To solve the problem, an alternative manner of mounting sensors outside the duct banks is proposed and a technique is developed to assess the cable thermal condition by matching the computed temperature to that measured with sensors in this paper. The matching process involves two methods: the finite element method (FEM) and an optimization method. Good consistency between prediction results and the actual measured values of network application proves its effectiveness in accurate assessment of thermal condition of three 220 kV/250 MVA underground cable circuits installed in duct banks entering a 220 kV substation.
中图分类号 TM85
所属栏目 研究与探索
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收稿日期 2014/2/6
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备注刘斌(1963-),男,高级工程师,研究方向为电力系统规划与管理。
引用该论文: Liu Bin,Zhang Long,Sun Zhenquan,Chen Xiping,Zhang Wei. Assessment of Thermal Condition and Current Rating of Underground Power Cables Installed in Duct Banks[J]. Power & Energy, 2014, 35(2): 152~155
刘斌,张龙,孙振权,陈西平,张伟. 地下管道群中安装电缆的热状态及载流量评估[J]. 电力与能源, 2014, 35(2): 152~155
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参考文献
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【3】梁永春,孟凡凤,王正刚,等.土壤直埋电缆群额定载流量的计算[J].高压电器,2006(04):244-246.
【4】罗俊华,周作春,李华春,等.电力电缆线路运行温度在线检测技术应用研究[J].高电压技术,2007,33(1):169-172.
【5】彭超,赵健康,苗付贵.分布式光纤测温技术在线监测电缆温度[J].高电压技术,2006,32(8):23-24.
【6】Garrido C, Otero A F and Cidras J. Theoretical model to calculate steady-state and transient ampacity and temperature in buried cables[J]. IEEE Trans. on Power Delivery, 2003,18(3):667-678.
【7】Nelson R J, Brennan T F and Engelhardt J S. The application of real-time monitoring and rating to HPOF pipe cable systems[J]. IEEE Trans. on Power Delivery,1989,4(2):850-856.
【8】Neher J H. The transient temperature rise of buried power cable systems[J]. IEEE Trans. Power Apparatus and Systems,1964,83(2):102-111.
【9】孔祥谦.有限单元法在传热学中的应用[M].北京:科学出版社,1998.
【10】凌永祥,陈明逵.计算方法教程[M].西安:西安交通大学出版社,2005.
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