In the background of modern smart grid, fiber optic current transformer (FOCT) has become a research hotspot in power system because of its high accuracy, good dynamic performance and other excellent advantages. However, lower temperatures can easily lead to failures and shutdowns, which are extremely detrimental to the safety of the grid. In this paper, the optical frequency domain reflectometry (OFDR) technology is employed to investigate the scattering characteristic of fibers used in FOCT in massively variable temperature environments. The experimental results present the variation of optical loss of various optical fibers at different temperatures, which is particularly useful for further analyzing and investigating the low-temperature failure mechanisms of FOCT.
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