摘要
计算了40.5kV真空断路器开断空载变压器时由复燃和截流引起的暂态过电压。通过离散的傅里叶变换获得暂态过电压的三个主要频率分量,以此作为真空断路器的边界条件,首次对真空断路器灭弧室内的暂态电场采用有限元方法进行了计算。给出了灭弧室内的暂态电场分布,电场强度的最大值、发生时间及典型位置的电场强度随时间变化的曲线。讨论了暂态电场的一些特征,为真空断路器的绝缘设计提供参考。
The transient over-voltage between electrodes of 40.5 kV vacuum interrupter caused by current chopping and reignition when it switches off unload transformer is calculated. Three main frequency components of the steep-front transient over-voltage are obtained from Discrete Fourier Transform (DFT), which are regarded as boundary excitation. FEM is adopted to calculate the transient electric field of vacuum interrupter. The potential distribution curves at representative time are investigated and the electric field intensity distribution curves are also given. Some distinguishing features of the transient field are also discussed. It provides reference for insulation design of vacuum circuit breakers.
出处
《电工技术学报》
EI
CSCD
北大核心
2004年第4期52-55,75,共5页
Transactions of China Electrotechnical Society
