电缆动态载流量分析与研究

发布时间：2018-08-03 21:12

【摘要】：随着科技进步,人民生活水平不断提高,全社会对电能的需求日益增长。电缆作为电能在传输与应用过程中最重要的载体,其负载电流的最大值被称为电缆载流量,有关电缆载流量的研究一直以来都备受重视。迄今为止绝大部分与电缆载流量相关的研究都是围绕稳态载流量展开,针对动态载流量的研究起步较晚,缺乏系统成果。综合分析电缆动态载流量的研究成果可以得出:电缆导体的温度是研究动态载流量的重中之重,如果能够获得运行状态下电缆导体的实时温度数据,就可以根据数据对电缆的运行状态进行监测和控制;根据导体温升特性,指导增加瞬间电缆负荷的安全调度问题;同时有利于电缆负荷的优化和电缆运行的维护。文章在传统电缆载流量计算方法基础上,开展了对电缆动态载流量热路模型的研究,主要工作如下:首先,进行电缆温度场的动态计算。详细论证了电缆温度场模型的构建及计算方法,通过引入传热学经典理论将电缆热路模型与电路模型进行类比。在传统电缆载流量计算方法基础上对电缆温度场计算进行探究,编写Matlab程序实现稳态载流量与动态变化载流量两种情况下电缆各层温度的实时计算。既验证了计算值相对保守的经典载流量,又得出电缆可拓展的实际载流量。然后,探究了外部热源对电缆载流量的影响。根据IEC60287-3-3(2005)标准中介绍的交叉热源条件下电缆载流量计算公式,结合电缆周围热源对环境温度的影响,依据Kennelly原理,利用迭代法,分别计算得出单个交叉热源与多个交叉热源所引起的载流量降低因数。最后,设计电缆动态载流量与温度场的分析系统。结合辽宁勘察设计院对雁昌甲线13#和雁昌乙线13#的工程建设概况,在已知电缆数据参数和基本敷设情况下,应用Matlab中的GUI功能设计电缆动态载流量温度场分析系统。实现了复杂情况下电缆温度场数据的动态分析并预测相应情况下电缆实际负载,为电缆动态载流量预测和温度场分析的工程应用打下基础。
[Abstract]:With the progress of science and technology, the standard of living of the people is improving, and the demand for electric energy is increasing day by day. As the most important carrier of electric energy transmission and application, the maximum load current of cable is called cable current. Up to now, most of the researches related to cable current are focused on steady current, but the research on dynamic current starts late and lacks of systematic results. It is concluded that the temperature of the cable conductor is the most important part of the research on the dynamic load current of the cable. If the real-time temperature data of the cable conductor can be obtained, It can monitor and control the running state of the cable according to the data, direct the safe dispatch problem of increasing the instantaneous cable load according to the characteristic of conductor temperature rise, and be beneficial to the optimization of cable load and the maintenance of cable operation at the same time. Based on the traditional cable load calculation method, this paper studies the hot circuit model of cable dynamic carrier current. The main work is as follows: firstly, the dynamic calculation of cable temperature field is carried out. The construction and calculation method of cable temperature field model are discussed in detail. By introducing the classical theory of heat transfer, the cable thermal circuit model is compared with the circuit model. Based on the traditional cable load calculation method, the cable temperature field calculation is studied, and the Matlab program is written to realize the real-time calculation of the cable temperature under the condition of steady load current and dynamic change carrier current. It not only verifies the classical carrier current which is relatively conservative in calculation, but also obtains the extensible actual load current of the cable. Then, the influence of external heat source on cable current is explored. According to the calculation formula of cable load under the condition of cross heat source introduced in IEC60287-3-3 (2005) standard, combined with the influence of heat source around cable on environmental temperature, according to the principle of Kennelly, the iterative method is used. The carrier flow reduction factors caused by single cross heat source and multiple cross heat sources are calculated respectively. Finally, the analysis system of cable dynamic load current and temperature field is designed. Combined with the general situation of the engineering construction of Yanchang A Line 13# and Yanchang B Line 13# in Liaoning Prospecting and Design Institute, under the known cable data parameters and the basic laying conditions, the GUI function in Matlab is used to design the cable dynamic carrier temperature field analysis system. The dynamic analysis of cable temperature field data under complex conditions and the prediction of cable actual load under corresponding conditions are realized, which lays a foundation for the engineering application of cable dynamic load prediction and temperature field analysis.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75

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