초록 ▼

In an optical current transformer, an optical sensor is made up of two optical sensor units which are independent of each other. Incident light beams are applied to the optical sensor units, and the emergent light beams from the latter are subjected to addition, to obtain a measurement signal which

In an optical current transformer, an optical sensor is made up of two optical sensor units which are independent of each other. Incident light beams are applied to the optical sensor units, and the emergent light beams from the latter are subjected to addition, to obtain a measurement signal which is proportional to a current under test which flows in a conductor. The optical sensor units are substantially U-shaped bars, which are Faraday effect glass bars which are rectangular in cross section and have 45.degree. reflecting surfaces at the corners.

대표청구항 ▼

[ What is claimed is:] [1.] An optical current transformer comprising:an optical sensor made up of Faraday effect glass bars, thus forming a rectangular optical path which surrounds a conductor in which a current to be measured flows;a light emitting unit for emitting a light beam, the light beam be

[ What is claimed is:] [1.] An optical current transformer comprising:an optical sensor made up of Faraday effect glass bars, thus forming a rectangular optical path which surrounds a conductor in which a current to be measured flows;a light emitting unit for emitting a light beam, the light beam being converted into a linearly polarized light beam through a polarizer and being applied to said optical sensor; anda detector which receives an emergent light beam through an analyzer from said optical sensor, and outputs an electrical signal proportional to the current to be measured, whereinthe optical path is divided into parts,said optical sensor including at least two optical sensor units which form the parts of the optical path thus divided,a linearly polarized light beam is applied to each optical sensor unit, andpolarized components proportional to the current which are included in the output light beams of said optical sensor units are subjected to addition, to obtain a measurement signal.