摘要
当电缆线路发生短路故障时,在短路电动力的作用下,会对电缆支架及金具的机械性能造成威胁。传统计算电缆短路电动力的方法为公式法,公式法只能计算最大短路电动力,存在求解对象单一、无法体现力随时间变化等局限性。采用基于电磁耦合的有限元计算方法,建立电缆短路电动力有限元计算模型;基于麦克斯韦电磁理论和高斯散度定理,对电缆进行瞬态电磁场分析,得到电缆上的短路电动力随时间变化情况。与公式法计算结果进行对比,仅有2.11%的误差。研究结果表明,基于有限元电磁仿真的短路电动力计算方法,能直观得到短路期间各个时刻电动力的分布情况和振动频率。可将有限元电磁仿真的电动力计算方法运用至其他故障类型的短路分析中。
When a short-circuit fault occurs in the cable line,the mechanical properties of the cable bracket and hardware will be threatened under the action of short-circuit electric power.The traditional method of calculating cable short-circuit electric force is formula method.The formula method can only calculate the maximum short-circuit electric force,and there are limitations such as single solution object and inability to reflect the change of force with time.In this paper,the finite element calculation method based on electromagnetic coupling is used to establish the finite element calculation model of cable short-circuit electrodynamic force.Based on Maxwell's electromagnetic theory and Gauss divergence theorem,the transient electromagnetic field analysis of the cable is carried out,and the change of short-circuit electrodynamic force on the cable with time is obtained.Compared with the calculation results of the formula method,there is only 2.11%error.The results show that the calculation method of short-circuit electrodynamic force based on finite element electromagnetic simulation can intuitively obtain the distribution and vibration frequency of electrodynamic force at each moment during short circuit.The electrodynamic calculation method of finite element electromagnetic simulation can be applied to short-circuit analysis of other fault types.
作者
徐斌兵
陈梓尧
刘宇彬
雷佳成
秦睿
杨鑫
XU Binbing;CHEN Ziyao;LIU Yubin;LEI Jiacheng;QIN Rui;YANG Xin(Hunan Jingyan Electric Power Design Co.,Ltd.,Changsha 410007,China;School of Electrical and Information Engineering,Changsha University of Technology,Changsha 410114,China)
出处
《湖南电力》
2023年第1期23-29,共7页
Hunan Electric Power
基金
国家自然科学基金(52177015)
湖南经研电力设计有限公司科技项目(FJS21030)。
关键词
电缆支架
电动力
有限元法
三相短路
公式法
cable bracket,electrodynamic force,finite element method
three-phase short circuit
formula method
