Patent ID: 8558535

Claim:
A method of measuring the current in a 3-phase cable comprising three individual section-shaped phase conductors insulated in relation to one another and encapsulated inside an insulator, the 3-phase cable defining a diameter, a longitudinal dimension along said 3-phase cable, and a radial dimension perpendicular to the longitudinal dimension, the method comprising: providing a frame located outside of the insulator and spaced apart from the insulator; providing a Faraday optical current sensor arrangement comprising three Faraday optical current sensors, each Faraday optical current sensor being fixed in a specific position on the frame outside of the insulator and spaced apart from the insulator; providing a processing unit operable for calculating a current value from a magnetic field value input thereto; measuring three magnetic field values by using each of the three Faraday optical current sensors; and calculating a current value in each of the section-shaped phase conductors by using the processing unit with the three magnetic field values input thereto.