Experimental Study on Current Measurement of Rogowski Coil in a Cryogenic Environment

The Rogowski coil current sensor consists of a Rogowski coil and an integrator. The coil output voltage is proportional to the derivative of the primary current, and the integrator converts the differential into a normal state. Its advantages of good linearity and light weight arc gaining more and more attention in the current sampling of smart grids and new electrical equipment, but Rogowski coils have different requirements in different application scenarios. In order to meet the practical needs of current measurement of parallel superconducting units in high temperature superconducting devices, a Rogowski coil can be designed and fabricated from use for cryogenic environments. The Rogowski coil bobbin is made of Fiber Reinforced Plastic (FRP), which has a small deformation in a cryogenic environment and can ensure the accuracy of current measurement. The experimental results show that the linearity of the Rogowski coil is well, and the linear scale factor of the normal temperature environment and the cryogenic environment is well, which can be used to measure the current of the superconducting parallel unit.