Electrical current transducer to measure the current flowing in a primary conductor, the transducer including an outer casing, a magnetic core comprising a magnetic circuit gap, a magnetic field detector comprising a sensing portion positioned in the magnetic circuit gap, an insulating core housing, a secondary coil formed from a wire wound around a coil support portion of the insulating core housing, and an electrostatic shield. The electrostatic shield is positioned between secondary coil and a radially inner wall portion of the outer casing, the radially inner wall portion defining a passage configured to receive said primary conductor therethrough. The electrostatic shield comprises a skirt portion formed by a plurality of flexible strips extending axially from an edge of the shield, the flexible strips configured to elastically bias against a base wall portion of the outer casing.

A current sensor arrangement for measuring an effective primary current in a primary conductor having a magnetic core for magnetic coupling of the primary conductor to a secondary conductor and a controlled voltage source connected to the secondary conductor and configured to apply a voltage with adjustable polarity to the secondary conductor so that a secondary current passes through the secondary conductor. A measurement and control unit is coupled to the secondary conductor and configured to generate a measuring signal that represents the secondary current, to continuously detect the occurrence of magnetic saturation in the core, and to reverse the polarity of the voltage upon the detection thereof in order to reverse magnetization of the core. Furthermore, the measurement and control unit is configured to evaluate a spectrum of the measuring signal and determine a frequency of a current passing through the primary conductor based on the spectrum.

A current leakage detector for detecting current leakage between a power source and a load including a first sensing coil and a second sensing coil positioned opposite the first sensing coil. The current leakage detector further includes a magnetic field sensor proximate the first sensing coil and the second sensing coil and the magnetic field sensor has a response range. The current leakage detector also includes a bias circuit configured to adjust the response range of the magnetic field sensor. A method for detecting current leakage includes providing a first sensing coil and a second sensing coil. The method continues with the steps of providing a magnetic field sensor in proximity to the first and second sensing coils and providing a bias circuit. The method continues with the step of utilizing the bias circuit to place the response of the magnetic field sensor within a preferred response range.

A current leakage detector for detecting current leakage between a power source and a load including a first sensing coil and a second sensing coil positioned opposite the first sensing coil. The current leakage detector further includes a magnetic field sensor proximate the first sensing coil and the second sensing coil and the magnetic field sensor has a response range. The current leakage detector also includes a bias circuit configured to adjust the response range of the magnetic field sensor. A method for detecting current leakage includes providing a first sensing coil and a second sensing coil. The method continues with the steps of providing a magnetic field sensor in proximity to the first and second sensing coils and providing a bias circuit. The method continues with the step of utilizing the bias circuit to place the response of the magnetic field sensor within a preferred response range.

The present disclosure provides an improved Rogowski-type current sensor. The current measurement coil, and the compensation coil are provided on the same board. The measurement coil and the compensation coil are arranged such that they at least partially overlap by virtue of each repeatedly changing side of the board. This arrangement makes the current sensor far better at rejecting interference than certain other PCB Rogowski type coil arrangements.

The present disclosure provides an improved Rogowski-type current sensor. In order to allow the sensing coil and the compensation wire to overlap, the sensor is produced using two boards. The current sensing coil is provided on one board, and the compensation wire is provided on another board. The coil and the wire are arranged such that they at least partially overlap, and ideally the compensation wire is formed entirely within the area defined by the coil, albeit in a different plane. This arrangement makes the current sensor far better at rejecting interference than prior art PCB arrangements. In addition, the coil may be formed on a two-sided board. The board has upper radial elements formed on an upper surface, and lower radial elements formed on lower surface. The radial elements are connected using vias formed in the board. The upper radial elements are arranged in a first plane, and the lower radial elements are formed in a second parallel plane. The upper radial elements are arranged so that they are aligned with the lower radial elements, such that a pair of radial elements form a radial plane that is perpendicular to the board surface. This symmetry ensures excellent sensitivity to currents in a conductor.

An installation fixture for installing a device on a power line is disclosed. The fixture includes a lower cradle that may receive one part of the device, an upper cradle that may receive another part of the device, and a base. The installation fixture may be installed on a worker carrier for a boom truck or the like. The orientation of the lower cradle may be adjusted relative to the base to facilitate the installation on the power line. The upper cradle may be moved between an open position (where the parts may be loaded into the fixture) and a closed position (where the power line is captured between the two parts of the device) and at which time that parts can be secured together.

A first coil is wound around a first core, and have one end that is connected to ground and the other end that is connected to one end of a second coil. The second coil is wound around a second core, and has the one end that is connected to the first coil, and the other end that is connected to an excitation unit via a current-limiting resistor. A magnetic flux is generated in the first core by an excitation signal outputted from the excitation unit. Induced electromotive force is generated in the conductor due to the magnetic flux generated in the first core. The direction of the magnetic flux generated in the second core is opposite to the direction of the magnetic flux generated in the first core, and the induced electromotive forces of them generated in the conductor are cancelled each other out.

Electrical current transducer including a magnetic core comprising a magnetic circuit gap, a magnetic field detector comprising a sensing portion positioned in the magnetic circuit gap, an insulating support body comprising a coil support portion and a coil terminal connection portion, and a secondary coil formed from a wire wound around the coil support portion. The coil support portion has a generally U-shaped cross-sectional profile comprising a base wall, a radially inner wall extending from the base wall and a radially outer wall extending from the base wall, the radially inner and outer walls having a height configured such that open end edges thereof extend slightly beyond an axial thickness of the magnetic core including any manufacturing tolerances such that the open end edges are folded inwards around corners of the magnetic core by the coil wound around the magnetic core housing.

Individual coils as well as two or more coils arranged one over the other or one coil in combination with a sensor, which can be integrated into planar semiconductor technology are described. A coil comprises a turn and two supply lines for supplying current to the coil. The turn and the supply lines are formed from a metal layer. One of the two supply lines is connected to a first end of the turn and the other of the two supply lines is connected to a second end of the turn.