摘要
运用有限元法,研究了电缆终端应力锥安装错位时的高压静电场的分布和数值大小,计算了加载110 kV恒定电压于电力电缆上时,其终端的静电场分布与数值。应力锥正确安装时,覆盖电缆半导电层为60 mm,分析了应力锥覆盖电缆半导电层50、46、73 mm的电场分布和半导电层末端周围的电场畸变。最后对不同模型的仿真结果进行了比较,得出,应力锥安装过盈时,即覆盖半导电层超过60 mm,电场畸变严重,在工频下存在剧烈的局部放电现象。通过现场试验,验证了有限元分析结果的正确性。
The electrostatic field intensity and distribution around the power cable terminal with 110 kV constant voltage are computed with the finite element method.When the power cable terminal is installed correctly,the stress cone covers the outer semi-conducting layer of 60 mm.Three models of mis-installed power cable terminal are computed for the stress cone covering outer semi-conducting layer of respective 50 mm,46 mm,and 73 mm with the finite element method to analyze the distortion of electrostatic field.The results show that when stress cone covers the outer semi-conducting layer more than 60 mm,the local electrostatic field is distorted obviously and the electrostatic field intensity increases significantly.Over-coverage of the stress cone harms insulation materials.Field test verifies the analysis based on the finite element method.
出处
《高压电器》
CAS
CSCD
北大核心
2010年第6期86-88,共3页
High Voltage Apparatus
关键词
有限元
电缆终端
静电场
应力锥
安装错位
finite element method
power cable’s terminal
electrostatic field.
