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Research on the fault mechanism of FOCT and its reliability improvement measures

In this paper, the working principle of fiber-optical current transformer(FOCT) is introduced and its fault mechanism is further studied to provide a more comprehensive review of the operation fault. The results show that the component of second harmonic in the FOCT output is the main cause of the FOCT fault. According to the influencing factors of the second harmonic, the fault cause of FOCT can be divided into the optical path fault and modulation signal fault. Simulation is carried to show the changing relationship between the two causes and the component of second harmonic. Finally, the improvement measures to promote the reliability of FOCT are proposed from the aspects of operation and maintenance. The researches provide important guidelines for the mechanism fault of FOCT and its operation reliability.