高压直流导线表面粗糙度与电晕放电时粗糙系数的关系  

Relationship Between the HVDC Conductor Surface Roughness and the Roughness Coefficient of Corona Discharge

作　　者：王东来[1] 卢铁兵[1] 林耀煜 卞星明[1] 甄永赞[1] WANG Donglai;LU Tiebing;LIN Yaoyu;BIAN Xingming;ZHEN Yongzan(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学新能源电力系统国家重点实验室

出　　处：《高压电器》2019年第6期192-197,共6页High Voltage Apparatus

基　　金：国家自然科学基金资助项目(51307056);国家电网公司科技项目(GY71-18-008)~~

摘　　要：高压输电线路表面磨损会对线路电晕放电造成影响。粗糙系数是根据导线表面状态预测起晕场强的重要参数。文中研究了表面粗糙度与高压直流导线起晕场强以及粗糙系数之间的关系,基于触针法测量了圆截面导线的表面粗糙度,利用圆柱电晕笼获得了导线正负极直流起晕电压,得到了粗糙系数与导线表面粗糙度之间的变化规律。导线粗糙度在0.5μm到2.5μm的范围内变化时,粗糙系数随表面粗糙度增大而减小。与正极相比,表面粗糙度对负极电晕放电影响更大。表面粗糙度越大,粗糙度变化对粗糙系数的影响越明显。The surface wear of high voltage transmission lines will influence the corona discharge characteristics.The roughness coefficient is an important parameter to predict the corona initial electric field according to the surface condition of conductors.In this paper,the relationship between the conductor surface roughness and the DC corona initial electric field or the roughness coefficient is researched.The surface roughness of conductors with circular cross-section is measured with contact stylus method.Positive and negative corona initial voltages of conductors are analyzed by using a cylindrical corona cage.The functional relation between surface roughness and roughness coefficient is presented.It is revealed that the roughness coefficient decreases with the increase of the surface roughness from 0.5μm to 2.5μm.Compared with positive corona discharge,the surface roughness has a stronger effect on negative corona discharge.The influence of surface roughness on roughness coefficient is more significant with the surface roughness becoming larger.

关 键 词：高压直流输电 电晕放电 表面磨损 粗糙系数 起晕场强 

分 类 号：TM75[电气工程—电力系统及自动化]