摘要
西北地区的330 kV线路地处高海拔地区,线路上采用的FD-5型防振锤普遍出现了显著的电晕放电现象,既造成功率损耗,又产生可听噪声和无线电干扰。为此,对防振锤的结构进行优化,以使其在高海拔地区正常运行时无电晕发生,同时保证防振性能满足要求。根据有限元法建立了FD-5型防振锤的三维模型,通过仿真计算,得出了锤头的电场强度分布规律,并对其结构进行优化,使锤头上的最高场强降低了17%。根据优化结果制造试品后,对试品进行低气压下的电晕试验和功率特性试验,结果表明:优化后的防振锤运行在海拔3 500 m时可有效防止电晕放电,谐振频率和功率消耗减小幅度低于6%,但是其峰谷比小于5,防振性能依然良好。
The 330 kV transmission lines in Northwest China are located in high altitude localities. On the surface of the FD-5 type damper installed to 330 kV transmission lines the corona discharge phenomena generally appear, which cause power loss and lead to audible noise and radio interferences. For this reason the structure of the damper was optimized to suppress the corona occurred in 330 kV transmission lines located in high altitude localities, meanwhile its anti-vibration performance should be ensured. Based on finite element method＇ a three-dimensional model of FD-5 type damper was built, and the distribution regularity of electric filed at the damper-head was obtained by simulation and based on the distribution regularity the structure of the damper was optimized to make the highest filed strength reduced by 17 percent. According to optimization results the prototypes with the optimized structure were manufactured and by which the corona test and power characteristic test under low atmosphere pressure were performed. Test results showed that when the dampers with optimized structure were operated at the high altitude locality of 3 500 m, the corona discharge could be effectively prevented; the resonant frequency and power loss of the new dampers were reduced by 6 percent, however their peak to valley ratios were lower than 5, and good anti-vibration performance of the damper was still kept.
出处
《电网技术》
EI
CSCD
北大核心
2012年第6期262-265,共4页
Power System Technology
关键词
防振锤
防晕
电场分布
高海拔
功率特性
damper
anti-corona
electric field distribution
high altitude locality
power characteristic
