摘要
根据电场和温度场的相似性,提出了用于计算地下电缆群稳态温度场的模拟热荷法。利用热路的方法将电缆金属套损耗和铠装层损耗归算到电缆导体。利用调和平均法对电缆导体外的多层介质进行处理,最终将电缆等效为导体和外护层的2层结构。根据换热量相等的原则,将地表空气对流换热系数等效为一定厚度的土壤。在电缆线芯和空气中用模拟热荷代替原来的线芯损耗和空气对土壤温度场的影响。然后根据镜像法,按照地表空气等温、导体等温以及外护层和土壤边界温度梯度相同列出约束方程组。利用高斯法求解方程组,求得地下电缆群稳态温度场的分布。试验和有限元仿真验证了模拟热荷法在地下电缆群稳态温度场计算中的有效性。
Heat charge simulation method which was derived from comparison of electric and thermal field was presented to calculate the static temperature field of underground cables. Losses in cable sheath and armor were moved into cable conductor by thermal circuit method. The cable which was composed of multiple layers was equivalent to two layers, conductor and outer layer, by harmonic mean method. The coefficient of air convection on ground was substituted by equivalent depth of soil based on the equivalent quantity of heat exchanged between ground and air. Some heat charges were used to simulate the loss in cable core and the temperature of air. The constraint equations of isothermal and the same temperature gradient were established by mirror method. Gauss method was used to solve these equations and calculate the static temperature field of underground cables. The test and finite dement method （FEM） simulation have proved that heat charge simulation method is effective to calculate the static temperature field of underground cables.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2008年第16期129-134,共6页
Proceedings of the CSEE
关键词
地下电缆群
稳态温度场
热路
调和平均法
模拟热荷法镜像法
高斯法
underground cables
static temperature field
thermal circuit method
harmonic mean method
heat charge simulation method
mirror method
Gauss method
