高海拔地区高压直流屏蔽金具电晕特性
发布时间：2019-06-19 03:02
【摘要】：随着高压直流屏蔽金具国产化的推进,越来越多的国产金具如屏蔽环等逐渐应用到换流站中,而屏蔽环电晕起始特性随自身尺寸变化规律目前尚不清楚。为研究屏蔽环的电晕特性,依据±500 k V木家换流站和昭通换流站阀厅典型屏蔽环的尺寸,设计了环径分别为600、800、1 000 mm的3组屏蔽环,在昆明南网特高压试验基地(海拔约为2 100 m)开展试验,采用阶梯升压方式对屏蔽环加载电压,通过紫外成像仪判断屏蔽环是否发生电晕,以确定对应的电晕起始电压,并根据试验布置建立3D电场仿真模型,采用有限元数值仿真方法,计算出各屏蔽环对应的电晕起始场强。通过对屏蔽环电晕特性的分析研究得出屏蔽环电晕起始电压与场强随环径、管径的变化趋势,并给出各典型尺寸屏蔽环在高海拔地区的电晕起始控制场强,其中最小的起晕场强控制值21k V/cm,这为实际工程提供了校核参考数据,并为屏蔽金具的国产化设计和选型提供参考。
[Abstract]:With the development of localization of HVDC shielded fittings, more and more domestic gold tools, such as shielding rings, are gradually applied to converter stations, but the variation of corona initiation characteristics of shielded rings with their own size is not clear at present. In order to study the corona characteristics of the shield ring, according to the size of the typical shielding ring in the valve hall of 卤500kV Mujia converter station and Zhaotong converter station, three groups of shielding rings with ring diameters of 600 and 800 and 1000 mm were designed. The test was carried out at Kunming Nanquan UHV Test Base (altitude about 2 100 m). The voltage of the shield ring was loaded by step boost mode, and whether the shielding ring occurred or not was judged by UV imager to determine the corresponding corona starting voltage. According to the experimental arrangement, the 3D electric field simulation model is established, and the corona initiation field strength corresponding to each shielding ring is calculated by using the finite element numerical simulation method. Through the analysis and study of the corona characteristics of the shielding ring, the variation trend of the initial voltage and field strength of the shielding ring corona with the ring diameter and pipe diameter is obtained, and the corona initial control field strength of each typical size shielding ring in the high altitude area is given, in which the minimum halo field intensity control value is 21kV 鈮，
本文编号：2502019
[Abstract]:With the development of localization of HVDC shielded fittings, more and more domestic gold tools, such as shielding rings, are gradually applied to converter stations, but the variation of corona initiation characteristics of shielded rings with their own size is not clear at present. In order to study the corona characteristics of the shield ring, according to the size of the typical shielding ring in the valve hall of 卤500kV Mujia converter station and Zhaotong converter station, three groups of shielding rings with ring diameters of 600 and 800 and 1000 mm were designed. The test was carried out at Kunming Nanquan UHV Test Base (altitude about 2 100 m). The voltage of the shield ring was loaded by step boost mode, and whether the shielding ring occurred or not was judged by UV imager to determine the corresponding corona starting voltage. According to the experimental arrangement, the 3D electric field simulation model is established, and the corona initiation field strength corresponding to each shielding ring is calculated by using the finite element numerical simulation method. Through the analysis and study of the corona characteristics of the shielding ring, the variation trend of the initial voltage and field strength of the shielding ring corona with the ring diameter and pipe diameter is obtained, and the corona initial control field strength of each typical size shielding ring in the high altitude area is given, in which the minimum halo field intensity control value is 21kV 鈮，
本文编号：2502019
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