Non-contact voltage measurement based on electric field sensing integrated electro-optical sensors

Smart grids are aimed at improving the safety and reliability of grid operation. Smart sensors are the core element in building smart grids, and real-time sensing of voltage strength changes is an important reference indicator to fully grasp the operating status of the power system. Although the traditional contact voltage divider mode of voltage measurement has a high reliability, it has the disadvantages of narrow frequency band, weak immunity to electromagnetic interference and complex and inconvenient use. Based on the electromagnetic induction principle integrated electro-optical sensor as the core, this paper proposes a simplified decoupling method to achieve non-contact overvoltage measurement, effectively expanding the depth of overvoltage waveform information of the power grid, capturing different phase difference information of the distribution lines and obtaining the voltage of three-phase electricity. Applying the method to engineering practice, the no-load line closing transient voltage waveform was measured to be highly consistent with the actual.