The new power system incorporates a large number of renewable energy generation systems

thus higher requirements on the real-time performance

accuracy

and reliability of measurement technologies are put forward. High-voltage metrology

as a critical underpinning for ensuring the safe and stable operation of power systems

is confronted with new development opportunities and challenges. This paper reviews the current state of research in high-voltage metrology and provides an in-depth analysis of the mainstream technical approaches in areas including novel techniques for quantity traceability and dissemination

online metrology in complex electromagnetic environments

and ultra-high-voltage (UHV) testing. Furthermore

specific key techniques are summarized

including precise time synchronization

high-voltage remote calibration

integrated calibration platform of analog and digital quantities

ultra-fast transient overvoltage measurement

low power factor loss measurement

and voltage linearity assessment of ultra-high-voltage measurement systems. The advantages and disadvantages of existing technologies and their application scopes are analyzed

and future development trends in high-voltage metrology technologies are elucidated

including more efficient online calibration methods

expanded applications of optical instruments in the high-voltage domain

intelligent measurement based on new sensors

etc. Finally

recommendations are made for further developments of high-voltage metrology technologies oriented toward the new power system

aiming to provide a reference for the research and applications in the related fields.