OPTICAL CURRENT TRANSFORMER

摘要

Provided is an optical current transformer which inhibits the mechanical stress applied to the glass fiber wire of an optical sensor fiber and which has little current measurement errors. An optical sensor fiber (10) of which the glass fiber wire (10A) is covered with a protective covering material (10B) is arranged on the periphery of a conductive body (1). The optical sensor fiber (10) is provided with a polarizer/analyzer part (11) on one end. Meanwhile, on the other end of the optical sensor fiber (10), a ferrule (15) is adhered to the end of the glass fiber wire (10A), from which the protective covering material (10B) is removed, and a reflection member (12) is disposed on the end of the glass fiber wire (10A) to which the ferrule is adhered. A thermal stress absorption part (20) for making the end of the glass fiber wire (10A) a free end capable of moving in the optical axis direction is disposed on the other end of the optical sensor fiber (10). The thermal stress absorption part (20) is configured from: a protective cover (21) formed by closing the reflection member (12) side and for surrounding the end of the optical sensor fiber (10); and an adhesive part (22) for adhering the protective cover (21) to the outer circumferential surface of the protective covering material (10B).