摘要
近年由于绝缘裕度设计不足和工艺存在细微缺陷导致南方电网3支网侧套管发生爆炸,对换流变压器套管进行改进。针对改进后套管下瓷套长度及其截面积发生明显变化,且改进型套管接地法兰的直径与原套管不同,为了将改进型套管在换流变原有的接口上顺利安装,文中重新对套管升高座及其CT的尺寸进行设计。利用ANSYS有限元软件,建立二维轴对称有限元模型,对套管及升高座进行电场分布仿真,最后对改进型套管进行绝缘性能测试,仿真和试验结果表明:改进型套管最大场强均小于原套管,新套管在绝缘性能方面更具优越性。改进型套管及升高座运行可靠,至今未发生任何绝缘故障,验证了套管改进措施的有效性,该处理方法对其它直流工程同类型套管改造具有指导作用。
The poor design of insulation and the slight defect of process lead to the explosions of the China Southern Power Grid＇s 3 grid side bushings in recent years. Therefore, the converter transformer＇s bushings have been modified. According to the improved bushing＇s below length, cross-sectional area and diameter of grounded flange have been changed significantly, and in order to install the improved bushing into the original interface successfully, the bushing＇s ascending flange and current transformer are redesigned in this paper. The two-dimensional axial symmetry models of the bushing and bushing＇s ascending flange are given by ANSYS, and the potential distributions of bushing and bushing＇s ascending flange are studied. Finally,the improved bushing＇s insulation performances are tested. The results of simulation and test show that the new bushing has superiority in terms of insulation performance. The improved bushing and bushing＇s ascending flange are running reliably, and the improved bushing have never occurred any insulation fault as yet, therefore, the improvement measures for the bushing are effective. The improvement measures play a guiding role in transformation of the same type of bushings in other HVDC projects.
出处
《高压电器》
CAS
CSCD
北大核心
2015年第12期162-167,共6页
High Voltage Apparatus
关键词
换流变压器
改进型套管
升高座
有限元法
电场仿真
绝缘试验
converter transformer
improved bushing
bushing＇s ascending flange
finite element method
electric field simulation
insulation test
