Electromagnetic Transient Simulation and Electromagnetic Simulation for Conductivity of Pure Optical CT in UHVDC Project

The flexibility and straightness engineering has high requirements for the response time, dynamic range and accuracy of the measurement system. The traditional electronic current measurement device cannot meet the requirements, while the pure optical current measurement device (pure optical CT) has faster response speed and wider measurement range, which is widely used in Kunliulong and Zhangbei flexibility and straightness engineering. However, more than 30 measurement abnormalities caused by internal discharge of optical fiber insulators have occurred in the pure optical CT of Kunliulong Project since it was put into operation, seriously affecting the stable operation of the project. This project carries out simulation research on UHV pure optical CT, which is generally divided into two parts: one is the electromagnetic transient simulation research on UHV pure optical CT, and the other is the research on the allowable conditions of components and materials of pure optical CT. At present, the electromagnetic transient simulation research on conductivity of UHV pure optical CT and the refined simulation research on impurity defects of pure optical CT have been completed.