3-phase Faraday optical current sensor assembly
AssigneePowersense A/S
InventorFreddy Sørensen
Life of this patent
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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.
Claims21
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.
A system for measuring the currents in a 3-phase cable comprising 3 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 the 3-phase cable and a radial dimension perpendicular to the longitudinal dimension, the system comprising:
- a frame located outside of the insulator and spaced apart from the insulator;
- a Faraday optical current sensor arrangement comprising three Faraday optical current sensors, each operable for measuring a magnetic field value, each Faraday optical current sensor being fixed in a specific position on the frame outside of the insulator and spaced apart from the insulator;
- and
- a processing unit operable for calculating a current value in each of the section-shaped phase conductors in response to the input thereto of the magnetic field values from the three Faraday optical current sensors.
Dependencies are inferred from the claim text.