摘要
以110 kV电缆接头为例,提出采用非线性电导绝缘材料替代固定电导材料,实现材料参数关于空间的自匹配,进而实现对电缆接头局部高场强的抑制作用。仿真结果发现,应力锥采用非线性电导材料与采用固定电导时电缆接头场强分布几乎一致,而电缆绝缘采用非线性电导材料情况下对局部场强集中抑制效果较为明显。为获取最佳非线性参数,建立电缆接头COMSOL-MATLAB联合仿真模型,通过有限元仿真和数值计算结合的方法分析电缆接头内部场强分布随参数变化的情况,并基于遗传算法实现快速寻优。结果表明,当线性系数、非线性系数分别为3.850 1×10^(-12)和3.209 6×10^(-6)时效果最优,此时最大场强为5.931 5 kV/mm,对应的场强畸变因子为13.72%。选取合适的非线性电导材料作为电缆绝缘材料,对于均匀电缆接头内部场强有较好效果,为发展高电压等级电缆附件提供了思路。
Taking 110 kV cable joint as an example, the approach that replacing the fixed conductivity materials by non-linear conductivity insulating materials is proposed, which is expected to control the high local electric field strength by regulating the materials performance with space. The initial physics simulation results show that the effect of making the electric field strength distribution uniform is more obvious using nonlinear materials for cable insulation than using nonlinear materials for stress cone. In order to obtain the best non-linear parameters,a COMSOL&MATLAB simulation model of the cable joint is established. The field strength distribution of the cable joint is analyzed by means of combining finite element simulation and numerical calculation. Moreover, genetic algorithm is taken to realize rapid optimization. The co-simulation results show that the optimization stops when linear factor reaches 3.850 1×10^(-12) and nonlinear factor reaches 3.209 6×10^(-6), while the maximum electric field strength and the distortion factor of field strength are 5.931 5 kV/mm and 13.72% respectively. In conclusion, selecting suitable nonlinear conductivity material has a better effect on the uniform electric field strength distribution of the cable joint, which provides an feasible approach for the development of high-voltage cable accessories.
作者
罗智奕
詹威鹏
陈腾彪
胡力广
吕启深
LUO Zhiyi;ZHAN Weipeng;CHEN Tengbiao;HU Liguang;LV Qishen(Shenzhen Power Supply Bureau Co.,Ltd.,Shenzhen 518001,China)
出处
《电气应用》
2022年第2期36-41,I0007,I0008,共8页
Electrotechnical Application
基金
2021深圳供电局有限公司重点科技项目(0913002021030103SDAS00017)。
关键词
110
kV电缆接头
非线性电导
均匀电场
联合仿真
遗传算法
110 kV cable joint
nonlinenar conductivity
uniform electric field
co-simulation
genetic algorithm
