DEVICE OF ELECTRIC CURRENT MEASUREMENT Russian patent published in 2014 - IPC G01R15/24 

FIELD: measurement equipment.

SUBSTANCE: electric current measurement device comprises a signal processing circuit, which includes optic fibre for a sensor, a polarisation separation unit, a Faraday rotation device, a source of light and a photoelectric converting element. At the same time the optic fibre for the sensor is provided along the periphery of an electric conductor, via which the measured electric current flows, and has one end, onto which the linearly polarised light falls, and the other end, from which the falling linearly polarised light is reflected. The unit of polarisation separation is provided at one end of the optic fibre for the sensor, the Faraday rotation device is located between one end of the optic fibre for the sensor and the unit of polarisation separation. The Faraday angle of rotation of the Faraday rotation device at magnetic saturation is set as 22.5°+α° at temperature of 23°C so that the range of oscillations of the relative error of measured electric current value produced from the signal processing circuit, is set in the range of ±0.5%, besides, the temperature range, in which the range of oscillations is set within ±0.5%, amounts to 100°C.

EFFECT: improved accuracy of measurements.

9 cl, 23 dwg, 5 tbl