摘要
绝缘子表面积聚的电荷会畸变电介质表面电场进而引发沿面闪络。为研究空气氛围中绝缘介质表面在沿面流注放电发展过程中动态电荷积聚情况,在自主开发的二维流体沿面放电仿真模型中增加化学反应体系,模拟了正负极性沿面放电在起始及发展过程中流注自身特性以及介质表面电荷分布特性的演化过程。研究发现施加电压为负极性时,介质表面始终累计负电荷,沿面流注头部累积电荷量极高,流注头部后方界面处电场极性反转,正离子向介质表面运动;施加电压为正极性时,沿面流注头部累积正电荷,尾部电子朝介质表面扩散,介质表面总电荷量为负值。
The surface charge accumulated on insulating materials could distort the electric field along dielectric surfaces and further cause flashover.In order to study the dynamic charge accumulation on a dielectric surface in the air during the discharge,chemical reactions were added to a 2D fluid model for surface discharge simulations,and then the surface charge evolution during discharge inception,attachment to the dielectric and propagation over the surface were simulated for cases which positive and negative voltages are applied,respectively.We found that when the applied voltage is negative,the accumulated charges are always negative.The peak value is around the streamer head for a surface streamer;the polarity of the electric field at the interface would reverse when the streamer head passed by,then positive ions would move to the surface.When the applied voltage is positive,positive charges are accumulated at the head of the surface streamer,and at the streamer tail electrons diffuse toward the surface,and the total charge on the dielectric surface turns negative.
作者
李晓冉
张雅琪
郭雨林
孙安邦
LI Xiaoran;ZHANG Yaqi;GUO Yulin;SUN Anbang(State Key Laboratory of Electrical Insulation and Power Equipment,School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Centrum Wiskunde&Informatica,Amsterdam,1098XG,The Netherlands)
出处
《高压电器》
CAS
CSCD
北大核心
2023年第9期84-89,共6页
High Voltage Apparatus
基金
电力设备电气绝缘国家重点实验室资助(EIPE22116)。
关键词
沿面放电
表面电荷
流体仿真
流注仿真
surface discharge
surface charge
fluid simulation
streamer simulation
