This paper reviews the development of the optical current sensor (OCS). OCSs based on different schemes are presented and introduced in detail. Principles and configurations are described to emphasize the advantages and disadvantages of each type. The development situations of each kind of OCSs are analyzed. Existing problems are discussed while related approaches to solve them are summarized. To promote the realistic engineering of the OCS in the electric power system, we propose some hopeful research directions in the end of the paper.
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