Design and simulation of all-fiber direct current transformer system based on Diamond NV color center

With the development of Ultra High Voltage(UHV) technology in China, the power system requires higher safety and reliability of current transformer. In recent years, the Diamond NV color center current transformer based on quantum precision measurement has attracted the attention of researchers due to its high precision and high sensitivity. In this paper, a system scheme of all-fiber direct current transformer based on Diamond NV color center is proposed, and the structure of the key device magnetic shielding ring is designed and simulated, the simulation results show that the three-layer magnetic shielding structure designed in this paper can make the theoretical accuracy of current measurement better than 0.2% without affecting the system range, thus providing a strong support for the development of all-fiber DC transformer based on diamond NV color center.