冲击电压作用下应力锥位置对高压电缆终端电场分布的影响

Influence of Stress Cone Location on the Electric Field Distribution in HV Cable Terminal Under Impulse Voltage

应力锥的位置对电缆终端电场分布的影响易被设计人员忽视,试验发现应力锥的位置对电缆终端的整体性能起着至关重要的作用,冲击电压作用时影响更甚。针对该现象,笔者采用有限元法,建立了相应的模型,计算了不同应力锥位置的110 kV的电缆终端电场分布情况,证明应力锥的位置对套管表面电场分布的影响,并通过试验对仿真结果进行验证。提醒设计人员应力锥在套管中的位置不可忽视。

The position of the stress cone in cable termination is easy to ignore for designers. It is indicated mrougn testing that the location of the stress cone has great impact on the overall performance of the cable termination, especially under the stress of impulse vohage. Aiming to this phenomenon, the simulation model is built by using the finite element method, and the electric field distribution for different locations of the stress cone in 110 kV cable terminal is computed. The results show that the position of the stress cone has effects on the electric field distribution of the bushing surface. It is verified by test result and the stress cone position in the bushing can not be ignored.