±800kV换流站直流电压互感器现场校准试验  

On-site Calibration Test of ±800 kV Convertor Station DC Potential Transformer

作　　者：章述汉[1] 周一飞[2] 李登云[1] 王韬[2] 李前[1] 李鹤[1] 

机构地区：[1]国网电力科学研究院,武汉430074 [2]四川电力科学研究院,成都610072

出　　处：《高电压技术》2011年第9期2119-2125,共7页High Voltage Engineering

基　　金：国家电网公司科技项目(SG0880)~~

摘　　要：直流电压互感器(DCTV)是测量高压直流输电系统电压的重要设备,对保证高压直流输电系统的安全稳定运行具有重要作用。针对±800 kV复龙换流站极线直流电压互感器,研究了直流电压互感器的基本原理,研制了1套用于直流换流站现场校准试验的直流高压标准装置——直流标准分压器和具有同步数据采集系统的测量设备,选择了合适的现场校准试验回路,完成了复龙换流站直流电压互感器的现场校准试验。试验结果表明:在0～500 kV电压范围,标准直流电阻分压器分压比的相对误差<0.05%,线性度为0.03%;在0～800 kV电压范围,标准直流电阻分压器的线性度<0.05%;复龙换流站极Ⅰ直流电压互感器的准确度等级满足0.2级的要求,线性度为0.27%,分压比随着电压的升高而减小。这说明直流高压标准装置已经具备了良好的进行±800 kV特高压直流电压互感器现场校准试验的能力。DC potential transformer（DCTV） plays an important role in HVDC transmission system for its safety and steady operation.Taking the pole bus DCTV in ±800 kV Fulong converter station as an example,we researched the principle of DCTV,and developed a set of HVDC standard setup used in converter station for calibration test on site.The setup was made up of a standard divider and a measurement device with synchronous data acquisition system.Moreover,we constructed an appropriate circuit for calibration test on site,and performed the calibration test on site at rated voltage for the pole bus DCTV in Fulong converter station.Test results reveal that,when voltage range is from 0 to 500 kV,the relatively error of the scale factor of standard resistor DC voltage divider is less than 0.05%,and the linearity is 0.03%;when voltage range is from 0 to 800 kV,the linearity of the scale factor of standard resistor DC voltage divider is less than 0.05%;the scale factor accuracy of DCTV at pole bus Ⅰ in Fulong converter station meets the demands of 0.2 class,the linearity is 0.27%,and the scale factor decreases gradually as the voltage increases.Meanwhile,the setup can well perform the on-site calibration test for ±800 kV UHV DCTV.

关 键 词：直流电压互感器(DCTV) 高压直流输电系统 极线 标准分压器 同步数据采集系统 现场校准试验 

分 类 号：TM451[电气工程—电器]