An electromagnetic induction power generator includes: a current transformer attached to a power transmission line; a rectifier circuit for rectifying an AC voltage output from the current transformer; and a regulator circuit for regulating a DC voltage output from the rectifier circuit. The current transformer has a magnetic core attached to the power transmission line serving as a primary winding and a secondary winding magnetically coupled to the power transmission line through the magnetic core. The magnetic core is configured to start to be magnetically saturated around the minimum value within the fluctuation range of a current flowing through the power transmission line.

A sensor for measuring current flow includes a power generation circuit, a current measurement circuit and a microcontroller. The power generation circuit includes a current transformer that harvests energy from a load applied to the conductor and uses the harvested energy to power the current measurement circuit and microcontroller. The current measurement circuit includes a Hall effect sensor that outputs a voltage signal in response to detecting a magnetic flux generated by the flow of current through the conductor. The microcontroller calculates a current measurement based on the voltage signal received from the current measurement system. The Hall effect sensor is able to generate the voltage signal used to measure current flow at the same time that the current transformer harvests energy from the current flowing through the conductor. A fault detection system is able to alert a user to problems with the current transformer and/or the Hall effect sensor.

A sensor for measuring current flow includes a power generation circuit, a current measurement circuit and a microcontroller. The power generation circuit includes a current transformer that harvests energy from a load applied to the conductor and uses the harvested energy to power the current measurement circuit and microcontroller. The current measurement circuit includes a Hall effect sensor that outputs a voltage signal in response to detecting a magnetic flux generated by the flow of current through the conductor. The microcontroller calculates a current measurement based on the voltage signal received from the current measurement system. The Hall effect sensor is able to generate the voltage signal used to measure current flow at the same time that the current transformer harvests energy from the current flowing through the conductor. A fault detection system is able to alert a user to problems with the current transformer and/or the Hall effect sensor.

A current transformer (10) includes a magnetic core, a first primary-side winding, a second primary-side winding, and a first secondary-side winding. The magnetic core includes a first magnetic core structure, a second magnetic core structure, and a third magnetic core structure. The first magnetic core structure is connected to the second magnetic core structure to constitute a first closed magnetic circuit, the first magnetic core structure is connected to the third magnetic core structure to constitute a second closed magnetic circuit, and the first magnetic core structure is a magnetic core structure common to the first closed magnetic circuit and the second closed magnetic circuit.

A current transformer (10) includes a magnetic core, a first primary-side winding, a second primary-side winding, and a first secondary-side winding. The magnetic core includes a first magnetic core structure, a second magnetic core structure, and a third magnetic core structure. The first magnetic core structure is connected to the second magnetic core structure to constitute a first closed magnetic circuit, the first magnetic core structure is connected to the third magnetic core structure to constitute a second closed magnetic circuit, and the first magnetic core structure is a magnetic core structure common to the first closed magnetic circuit and the second closed magnetic circuit.

A current detection device is configured by a current path through which a first current flows, a current path through which a second current flows, a switching element that switches the current paths and allows the first current and the second current to flow alternately, a common coil section through which an induction current flows by the first current and the second current, and a turn current path that alternates a first induction current flowing through the coil section by the first current and a second induction current flowing through the coil section by the second current.

A current detection device is configured by a current path through which a first current flows, a current path through which a second current flows, a switching element that switches the current paths and allows the first current and the second current to flow alternately, a common coil section through which an induction current flows by the first current and the second current, and a turn current path that alternates a first induction current flowing through the coil section by the first current and a second induction current flowing through the coil section by the second current.

A current converter with fluid or oil paper insulation for high voltage, with a head housing through which a primary conductor passes. A measurement device through which the primary conductor passes is arranged in the head housing. The primary conductor includes two different primary conductor types, more specifically an outer tube primary conductor as the first type and one or more inner conductor primary conductors as the second type. The outer tube primary conductor surrounds an interior that is designed to receive the inner conductor primary conductor, and the inner conductor primary conductors can be inserted into the interior. The outer tube primary conductor is used to transmit power and creates an encasement for the inner conductors. Only the outer tube primary conductor needs to be sealed with respect to the head housing. Inner conductors therefore can be easily inserted or re-moved subsequently, without the need for sealing measures.

A current converter with fluid or oil paper insulation for high voltage, with a head housing through which a primary conductor passes. A measurement device through which the primary conductor passes is arranged in the head housing. The primary conductor includes two different primary conductor types, more specifically an outer tube primary conductor as the first type and one or more inner conductor primary conductors as the second type. The outer tube primary conductor surrounds an interior that is designed to receive the inner conductor primary conductor, and the inner conductor primary conductors can be inserted into the interior. The outer tube primary conductor is used to transmit power and creates an encasement for the inner conductors. Only the outer tube primary conductor needs to be sealed with respect to the head housing. Inner conductors therefore can be easily inserted or re-moved subsequently, without the need for sealing measures.

An electric current transformer including a first coil and a second coil, which are produced with a first printed circuit including a first positioning device, and a second positioning device; and a first magnetic part including a first holding device and a second magnetic part including a second holding device, the positioning device being arranged to join together with the holding device so as to hold reference faces of the magnetic parts a predetermined distance away from the turns of the first and second coils. A current measurement unit includes such a current transformer.