±800 kV特高压换流站换流阀组安装施工技术研究

Study on Installation and Construction Technology of Converter Valve Group of ±800 kV UHV Converter Station

为了解决现有施工技术应用后受到进闸导电率不稳定、进闸温度高等不稳定因素影响存在的安装效果差的问题,开展±800 kV特高压换流站换流阀组安装施工技术研究。首先使用升降车在阀塔顶部安装吊耳和悬挂支架,维持主水管构架稳定。利用电动葫芦将组装后的主水管部分运送到指定顶层位置,并与顶层装置绑扎。然后安装顶屏蔽罩支撑件并通过连接螺栓进行绑紧,确保光纤桥架衔接平滑。选择适当的屏蔽罩将阀组组装到绝缘子位置,并核对绝缘子编号与吊耳位置。安装主水管的固定块,连接上下固定块的分支路水管。最后利用测量工装确定每个绝缘子所需的调整垫厚度。安装底部绝缘螺杆,将底屏蔽罩调整至第一层阀模块下侧,并用螺钉固定在外侧绝缘子上。吊装过程中将底屏蔽罩吊至适当高度,并固定水管与阀层间水管的连接。安装避雷器,调整绝缘子上部螺栓长度,使其自然下垂后拧紧螺钉,从而完成换流阀组安装。测试结果表明,在11:12到13:10时间段内,进闸导电率稳定在0.2~0.25之间,进闸温度保持恒温,进闸流量显示稳定,换流阀的安装效果达到最优,可保证工程换流阀的应用安全。

In order to solve the problem of poor installation effect caused by unstable inlet conductivity and high inlet temperature after applying existing construction technology,the installation and construction technology of converter valve group in±800 kV UHV converter station is studied.First the lift truck is used to install the lifting lugs and suspension brackets on top of the valve tower to maintain the main water pipe frame.The electric hoist is used to transport the assembled main water pipe to the designated top position and tie it with the top device.Then the top shield support is installed and tied tightly by connecting bolts to ensure smooth connection of the optical fiber bridge.The valve block is assembled to the insulator position by selecting appropriate shield,and the insulator number and the lifting lug position are checked.The fixing blocks for the main water pipe are installed and the branch water pipes on the upper and lower fixing blocks are connected.Finally a measuring tool is used to determine the required adjustment pad thickness for each insulator.And the installation of bottom insulation screw,the adjustment and fastening of bottom shield to the lower side of the first layer valve module and to the outer insulator with screws,are performed.During the hoisting process,the bottom shield is lifted to the appropriate height,and the connection between the water pipe and valve interlayer pipe is fixed.The arrester is installed and the length of insulator upper bolt is adjusted to make it sag naturally and tighten the screw to complete the installation of the converter valve group.The test results show that during the time period from 11:12 to 13:10,the inlet conductivity is stable between 0.2 and 0.25,the inlet temperature is kept constant,the inlet flow is displayed stable,and the installation effect of the converter valve is optimized,which can ensure the application safety of the engineering converter valve.