High voltage ratio standard device is key to calibrate the high voltage measurement devices

and represents the highest measurement ability in the field of high voltage ratio measurement. Consequently

based on the current development of the high voltage ratio measurement technology around the world

the research achievements in the power frequency high-voltage series instrument transformer

two-stage instrument transformer

and active voltage divider are introduced.The technology comparison indicates that the rated voltage of inductive voltage ratio standard has been higher than 1 000 k V

and the capacitive ratio standards have been replaced completely. Moreover

the direct current voltage standard dividers developed by different national metrology institutes are introduced based on the DC ratio traceability methods. It is pointed out that the resistive voltage divider is still regarded as the first choice

and the schematic and structure will be different based on the traceability methods. Furthermore

the pulse voltage ratio standard devices including low damped divider

capacitive divider are introduced

and the main research has been changed from main impulse voltage divider to accurate measurement of the voltage signal of divider

however

anti-interference and uncertainty are the major challenges. In the end

the development trend and the key technologies of high voltage ratio standard devices are discussed.