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18 June 2014 Performance analyses for fast variable optical attenuator-based optical current transformer
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Abstract
In this paper, we analyze the performance of the electro-optic hybrid optical current transformer (HOCT) proposed by ourselves for high-voltage metering and protective relaying application. The transformer makes use of a fast variable optical attenuator (FVOA) to modulate the lightwave according to the voltage from the primary current sensor, such as low-power current transformer (LPCT). In order to improve the performance of the transformer, we use an optic-electro feedback loop with the PID control algorithm to compensate the nonlinearity of the FVOA. The linearity and accuracy of the transformer were analyzed and tested. The results indicate that the nonlinearity of the FVOA is completely compensated by the loop and the ratio and phase errors are under 0.07% and 5 minutes respectively, under the working power of less than 1 mW power. The transformer can be immune to the polarization and wavelength drift, and also robust against the environmental interference.
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Pu Wei, Chen Chen, Xuefeng Wang, Xuekang Shan, and Xiaohan Sun "Performance analyses for fast variable optical attenuator-based optical current transformer", Proc. SPIE 9098, Fiber Optic Sensors and Applications XI, 90980Z (18 June 2014); https://doi.org/10.1117/12.2050371
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