Self-heating and electric field distribution are the primary factors affecting the accuracy of the Ultra High Voltage Direct Current(UHVDC)resistive divider.Reducing the internal temperature rise of the voltage divide...Self-heating and electric field distribution are the primary factors affecting the accuracy of the Ultra High Voltage Direct Current(UHVDC)resistive divider.Reducing the internal temperature rise of the voltage divider caused by self-heating,reducing the maximum electric field strength of the voltage divider,and uniform electric field distribution can effectively improve the UHVDC resistive divider’s accuracy.In this paper,thermal analysis and electric field distribution optimization design of 1200 kV UHVDC resistive divider are carried out:(1)Using the proposed iterative algorithm,the heat dissipation and temperature distribution of the high voltage DC resistive divider are studied,and the influence of the ambient temperature and the power of the divider on the temperature of the insulating medium of the divider is analyzed;(2)Established the finite element models of 1200 kV and 2×600 kV DC resistive dividers,analyzed the influence of the size of the grading ring and the installation position on the maximum electric field strength of the voltage divider,and calculated the impact of the shielding resistor layer on the vicinity of the measuring resistor layer.The research indicates that:(1)The temperature of the insulating medium is linearly related to the horsepower of the voltage divider and the ambient temperature;(2)After the optimized design of the electric field,the maximum electric field strength of the 1200 kV DC resistive divider is reduced to 1471 V/mm,which is about 24% lower than that of the unoptimized design;(3)Installing the shielding resistor layer can significantly improve the electric field near the measuring resistor layer.This paper has an important reference function for improving the accuracy of the UHVDC resistive divider.展开更多
针对扫描电子显微镜(Scanning Electron Microscopy,SEM)高分辨率和全天候工作的严格要求,提出并研制了具备高稳定度以及绝缘性能优良的200 kV高稳定性高压直流电源。实验表明该系统能达到3.42‰的开关纹波和2.45‰的工频纹波,每小时的...针对扫描电子显微镜(Scanning Electron Microscopy,SEM)高分辨率和全天候工作的严格要求,提出并研制了具备高稳定度以及绝缘性能优良的200 kV高稳定性高压直流电源。实验表明该系统能达到3.42‰的开关纹波和2.45‰的工频纹波,每小时的长期稳定性达到0.093‰~0.158‰,能够满足SEM对纹波和稳定性的要求。展开更多
基金supported by the Science and Technology Project of China Electric Power Research Institute,Research on 1200 kV DC Voltage Proportional Metering Technology with Weak Environmental Sensitivity and Development of Standard Devices(JL83-21-002).
文摘Self-heating and electric field distribution are the primary factors affecting the accuracy of the Ultra High Voltage Direct Current(UHVDC)resistive divider.Reducing the internal temperature rise of the voltage divider caused by self-heating,reducing the maximum electric field strength of the voltage divider,and uniform electric field distribution can effectively improve the UHVDC resistive divider’s accuracy.In this paper,thermal analysis and electric field distribution optimization design of 1200 kV UHVDC resistive divider are carried out:(1)Using the proposed iterative algorithm,the heat dissipation and temperature distribution of the high voltage DC resistive divider are studied,and the influence of the ambient temperature and the power of the divider on the temperature of the insulating medium of the divider is analyzed;(2)Established the finite element models of 1200 kV and 2×600 kV DC resistive dividers,analyzed the influence of the size of the grading ring and the installation position on the maximum electric field strength of the voltage divider,and calculated the impact of the shielding resistor layer on the vicinity of the measuring resistor layer.The research indicates that:(1)The temperature of the insulating medium is linearly related to the horsepower of the voltage divider and the ambient temperature;(2)After the optimized design of the electric field,the maximum electric field strength of the 1200 kV DC resistive divider is reduced to 1471 V/mm,which is about 24% lower than that of the unoptimized design;(3)Installing the shielding resistor layer can significantly improve the electric field near the measuring resistor layer.This paper has an important reference function for improving the accuracy of the UHVDC resistive divider.
文摘针对扫描电子显微镜(Scanning Electron Microscopy,SEM)高分辨率和全天候工作的严格要求,提出并研制了具备高稳定度以及绝缘性能优良的200 kV高稳定性高压直流电源。实验表明该系统能达到3.42‰的开关纹波和2.45‰的工频纹波,每小时的长期稳定性达到0.093‰~0.158‰,能够满足SEM对纹波和稳定性的要求。
