With the rapid development of modern power grids

there is an urgent need for intelligent

miniaturized

and low-power sensing devices. Voltage is a key characteristic quantity for power grid state assessment

fault identification and positioning

and system energy measurement

and it is one of the important parameters for evaluating the state of the power system. Non-invasive voltage sensing technology does not require direct contact with primary equipment

has low insulation requirements

and has broad development prospects. Therefore

this article mainly summarizes the principles of voltage measurement based on capacitive voltage division

voltage measurement based on electro-optic effect

and voltage measurement based on micro deformation force electrical signal conversion; Analyzed the factors affecting the accuracy of non-invasive voltage sensing devices and intelligent calibration methods; The development trend and application challenges of non-invasive voltage sensing technology have been clarified

laying the foundation for practical engineering applications.