The present disclosure relates to a capacitor bank control system that uses a combination of line post sensors and wireless current sensors for control operations. For example, a capacitor bank controller may include one or more inputs that electrically couple to a line post sensor to allow the capacitor bank controller to obtain line post sensor measurements. The capacitor bank controller may include a transceiver that receives wireless current sensor measurements from first and second wireless current sensors. The capacitor bank controller may include a processor that controls one or more switching devices of a capacitor bank based at least in part on a combination of line post sensor measurements and wireless current sensor measurements.

A module for detecting an electrical fault includes a housing; a first conductor and a second conductor; a first measurement toroid, positioned around the first conductor and around the second conductor, for measuring a differential current flowing between the first and second conductors; a second measurement toroid, positioned around the first conductor, for detecting an electric arc signal flowing through this conductor; a relay; an electronic processing circuit configured to switch the relay according to the current measured by the measurement toroids. The measurement toroids are aligned with one another and the first toroid takes the shape of an elongated tube and allows the differential protection to operate with its own current.

A current sensor is for determining the level of the current of a conductor of a low-voltage circuit. In an embodiment, it includes a current transformer including a magnetic core. The magnetic core is an annular core having a core inner diameter, a middle diameter and a core outer diameter. The annular core is wound with a secondary winding, including an inner opening with an inner diameter and an outer circumference with an outer diameter. The secondary winding supplies the circuit with electrical energy. The wound annular core is configured such that the difference between the middle diameter as the minuend and the inner diameter as the subtrahend is 0.5 to 0.6 times smaller than the difference between the outer diameter as the minuend and the inner diameter as the subtrahend, to achieve an optimum for supplying energy and determining the level of the current in connection with the circuit.

A monitoring system for sensing electrical parameters including current and voltage can comprise a current transformer and an antenna. The current transformer can be configured to sense current passing through a conductor. The antenna can be configured to sense electrical potential of the conductor by sensing an electric field generated by the conductor. The antenna can sense the electrical potential independent of whether current is present in the conductor. The monitoring system can further comprise a temperature sensor configured to sense a temperature of the conductor. A sensing module can include a housing supporting the current transformer, the antenna, and the temperature sensor for monitoring an electrical power circuit.

A core for an electric current detector comprises a pair of first and second core pieces (20), (23), wherein the first core piece has first opposed surfaces (21), (21) and the second core piece has second opposed surfaces (24), (24), the first and second opposed surfaces face to each other with a spacing between a first gap (26) and a second gap (28), respectively, and the first and second core pieces are covered by a resin-made first partial mold (30) on the area near and inclusive of the first gap and are covered by a resin-made second partial mold (40) on the area near and not inclusive of the second gap, wherein the second partial mold includes a second-1 molded member (41) on the first core piece side and a second-2 molded member (42) on the second core piece side.

The present invention relates to a device for measuring a magnetic field and, more specifically, for measuring direct and/or alternating currents circulating in a primary conductor. The current sensor 1 according to the invention comprises: •at least two magnetic transducers 2, 3, each comprising at least one elongate coil 5, 6, forming a loop surrounding the primary conductor; •at least one loop closure mechanism allowing two ends of the coils 5, 6 of a transducer 2, 3 to be retained while providing: —a negative mechanical gap between the two ends of the coils 5, 6 closing each loop, along a first elongation axis Y of the coils 5, 6; an offset of each end of a coil 5, 6 of a loop relative to the other end of a coil of the loop, along an offset axis X; —a mechanical inversion of the offsets between the loops.

Unique systems, methods, techniques and apparatuses of a power line measurement device are disclosed. One exemplary embodiment is a measurement device comprising a measurement device structured to at least partially surround a segment of a power distribution line, the measurement device including a winding portion spaced apart from the segment of the power distribution line structured to receive magnetic flux from the power distribution line and to output data corresponding to a current flowing through the power distribution line; and a magnetic shield spaced apart from the measurement device and positioned radially outward from the winding portion relative to the segment of the power distribution line, the magnetic shield comprising a first section and a second section coupled to the first section at an obtuse angle, the magnetic shield being structured to reduce an amount of external flux from being received with the measurement device.

A sensing device for monitoring an electrical component or apparatus is described. The sensing device is attachable to an electrical conductor and includes a sensor for measuring at least one physical property, a wireless communication unit for transmitting measurement data to a receiver, an energy harvesting unit configured to harvest energy from a current flowing through the electrical conductor and comprising an electromagnetic coil wound around a core, and a connection mechanism to make the core connectable to a strap comprising a material having a high magnetic permeability. The sensing device is configured to be operable when no strap is connected to the core and energy is harvested via an open magnetic circuit as well as when a strap is connected to the core and energy is harvested via a closed magnetic circuit.

A test lead for an electrical meter is provided. The test lead comprises a flexible elongate member comprising a current sensing coil at least partially disposed about a flexible core along the length of the member. A first connector is disposed at one end of the member for coupling a respective end of the current sensing coil to a test port of an electrical meter. A second connector is disposed at an opposing end of the member for coupling a respective end of the current sensing coil to an electrically conductive member, to provide an electrical path, via the sensing coil, from the electrically conductive member to the first connector.

An open loop electrical current transducer including a primary conductor bar, for carrying a current to be measured, a magnetic core having a U shape formed by an end branch and lateral branches upstanding therefrom to free ends, a magnetic circuit gap formed between inner surfaces of the lateral branches at the free ends of the lateral branches, a magnetic field detector positioned in the magnetic circuit gap, and a housing surrounding the magnetic core and a section of the primary conductor bar extending through the magnetic core and beyond the magnetic core either side thereof. The primary conductor bar includes a central portion having a width (Wc) equal to the width of a magnetic field gap (Wg) such that the central portion is clamped between said lateral branches in an interference force fit.