Wideband voltage sensing and measurement can provide important information for energy metering

intelligent control and relay protection of power system

which has an essential position in the fields of overvoltage online monitoring

fault warning

fault location and protection

and real-time monitoring of equipment status in grid. In the face of the ever-expanding smart grid in the future

voltage measurement has been transformed from traditional electromagnetic voltage transformers to electronic voltage transformers and optical voltage sensors

and measurement devices continue to be low-cost

low-power

miniaturized

and easy to install. Based on the current research status of broadband voltage sensing methods

this paper first introduces the contact measurement methods based on voltage dividers and optical voltage sensors and the non-contact measurement methods based on the stray capacitance-voltage division principle

GIS built-in electrode

and capacitance leakage current. Secondly

the applications of the broadband voltage sensing data in system protection

including statistics and research on typical fault waveforms

transient fault analysis of power equipment and protection means of power grid are emphatically expounded. At the same time

its applications in equipment intelligence

which is mainly divided into two parts such as line fault location and equipment insulation diagnosis

are summarized. On this basis

the challenges faced by broadband voltage sensing in terms of sensing methods

frequency and amplitude characteristics

temperature and humidity compensation

device miniaturization

and conformal integration with equipment are pointed out. Finally

further development prospects for broadband voltage sensing technology in the application in power system protection and equipment intelligence are made.