Abstract: A method and a system are provided for fixing a Faraday optical current sensor in a suitable measurement position for measuring the current in a 3-phase cable that includes 3 individual section-shaped phase conductors insulated in relation to one another and encapsulated inside an insulator. The method includes providing a Faraday optical current sensor arrangement having 3 Faraday optical current sensors, each of which is fixed in a specific position outside the insulator; and providing a processing unit for calculating a current value from a magnetic field value. The method is performed by measuring 3 magnetic field values using each of the 3 sensors and calculating the current in each of the section-shaped phase conductors using the processing unit and the 3 magnetic field values.

Abstract: The object of the invention is to provide a method and a system for fixating a Faraday optical current sensor (12a, 12b, 12c) in a suitable measurement position for measuring the current in a 3-phase cable (14). The 3-phase cable (14) comprises 3 individual section-shaped phase conductors (16a, 16b, 16c) insulated in relation to one another and encapsulated inside an insulator (18). The method comprises the provision of a Faraday optical current sensor arrangement comprising 3 Faraday optical current sensors (12a, 12b, 12c), each Faraday optical current sensor being fixated in a specific position outside the section-shaped phase conductors (16a, 16b, 16c), and the provision of a processing unit for calculating a current value from a magnetic field value.

Abstract: A Faraday optical current sensor arrangement for measuring the current through a power line comprises a Faraday optical current sensor (38) having an elongated and substantially cylindrical shape defining a first end and a second end opposite the first end. The Faraday optical current sensor has a first optical conduit (48) extending from the first end and a second optical conduit (48) extending from the second end. Furthermore, the Faraday optical current sensor arrangement comprises a hollow housing (12,14) enveloping the Faraday optical current sensor and fixating the Faraday optical current sensor in a specific measurement position relative to the hollow housing. The hollow housing defines a channel for accommodating the Faraday optical current sensor and the first and second optical conduits and an opening (15) for communicating with the channel.