Study on Long-Term Operation Stability of Fiber Optical Current Transformer Based on Faraday Effect

The long-term operation stability of fiber optical current transformer (FOCT) is a concern, with its wide use in smart grid. The FOCT long-term operation stability is related to whether FOCT can accurately measure the current in the smart grid, which affect the performance of the related equipment. In this paper, the long-term operation stability test results of the FOCTs in an 110kV smart substation will be an example to analyze the long-term operation stability problems, such as ratio error and phase error. And then the treatments can be proposed.