Fluxgate current transducer including a fluxgate device comprising a saturable soft magnetic core and an excitation coil, and a processing circuit comprising a control circuit and a voltage generator connected to the control circuit for generating an alternating current in the excitation coil, the voltage generator generating a voltage oscillating between a maximum positive voltage (+U) and a maximum negative voltage (−U) configured to alternatingly saturate the soft magnetic core. The signal processing circuit comprises an overload circuit portion connected to the control circuit, configured to generate overload currents through the excitation coil over time windows (Tn) after detection of the excitation coil current reaching positive and negative threshold currents (+S3, −S3) representative of saturation of the magnetic core, during at least one of a plurality of alternating voltage periods (P).

The present disclosure provides an arcing detection device. The arcing detection device may include a detection coil and a processing circuit operably connected to the detection coil. The detection coil may be configured to detect a current variation of a system. The processing circuit may be configured to determine information of an arcing event of the system based on the current variation of the system. The information of the arcing event of the system may include a position where the arcing event occurs in the system.

A switching method for a half bridge power converter includes at least a pair of power switches in legs of the convertor providing upper and lower branch power switches and first and second gate control circuits for the upper and lower branch power switches. The switching method includes sensing the current derivative in the upper and lower branches during switching of the pair of power switches to provide a first signal and a second signal proportional to the current derivative of the power current in the upper and lower power switches, summing the first and second signals to provide a summed current derivative signal, and adding the summed current derivative signal to the power switch command signal of the first and second gate control circuits causing the summed derivative signals to modulate the gate commutation signals of the gate control circuits.

The present disclosure pertains to systems and methods for monitoring a capacitance-coupled voltage transformer (CCVT) in electrical communication with the electric power delivery system, the CCVT comprising a stack of capacitors and an electrical contact to a first ground connection. A first current transformer is disposed between the stack of capacitors and the first ground connection. The current transformer provides an electrical signal corresponding to a current associated with the CCVT. A second transformer is disposed to provide a second electrical signal related to the CCVT. The second signal may be a voltage signal or a current signal. An intelligent electronic device (IED) in electrical communication with the current measurement devices monitors a health factor comprising a ratio of magnitudes or a difference between phases from the transformers at a single frequency. The health factor is compared against an acceptable range and an alarm is generated when the range is exceeded.

A current detection circuit capable of compensating for detection accuracy of a switching current through switching of a connection state of a resistor even when the switching current has a component in a direction opposite to a predetermined direction is provided. A current detection circuit for detecting a value of a component in a predetermined direction of a switching current using a current transformer, wherein, when the switching current flowing in a primary side of the current transformer has a component in a direction opposite to the predetermined direction, a connection state of reset elements on a secondary side of the current transformer is switched such that an impedance of a magnetic reset on the secondary side of the current transformer is decreased.

A current detection circuit capable of compensating for detection accuracy of a switching current through switching of a connection state of a resistor even when the switching current has a component in a direction opposite to a predetermined direction is provided. A current detection circuit for detecting a value of a component in a predetermined direction of a switching current using a current transformer, wherein, when the switching current flowing in a primary side of the current transformer has a component in a direction opposite to the predetermined direction, a connection state of reset elements on a secondary side of the current transformer is switched such that an impedance of a magnetic reset on the secondary side of the current transformer is decreased.

An electric circuit for measuring a current flowing in a conductor comprising: 2×N coils, N being an integer greater than or equal to 2, connected in series together; and a common mode filtering element associated with each of the 2×N coils, each filtering element being placed in parallel with the associated coil and being able to accomplish common mode filtering of the 2×N coils, a core of the 2×N coils having a relative permeability less than 10, and among the 2×N coils, N coils being wound in a direction opposite to the winding direction of the N other coils.

Electrical circuit for measuring a current flowing in a conductor comprising: a first pair of Rogowski-type coils connected in series, the Rogowski-type coils of the first pair being able to operate in a first frequency band; a second pair of Rogowski-type coils connected in series, the Rogowski-type coils of the second pair being able to operate in a second frequency band, the second frequency band comprising at least partly frequencies higher than the frequencies of the first frequency band; and a means for electrically shielding the first pair of coils, and wherein a core of the Rogowski-type coils of the first and second pairs has a relative permeability of less than 10 and wherein one coil of each pair comprises at least one multi-turn winding, the other coil of the pair comprising at least one multi-turn winding.

Electrical circuit for measuring a current flowing in a conductor comprising: a first pair of Rogowski-type coils connected in series, the Rogowski-type coils of the first pair being able to operate in a first frequency band; a second pair of Rogowski-type coils connected in series, the Rogowski-type coils of the second pair being able to operate in a second frequency band, the second frequency band comprising at least partly frequencies higher than the frequencies of the first frequency band; and a means for electrically shielding the first pair of coils, and wherein a core of the Rogowski-type coils of the first and second pairs has a relative permeability of less than 10 and wherein one coil of each pair comprises at least one multi-turn winding, the other coil of the pair comprising at least one multi-turn winding.

An electrical power generating assembly for a wind turbine. The electrical power generating assembly comprises a gearbox comprising a gearbox output shaft, a generator comprising a rotor that is coupled to the gearbox output shaft; and a current measuring module located between the gearbox and the generator. The current measuring module comprises: an electrical pickup mounted to the electrical power generating assembly, wherein the electrical pickup includes an electrical contact that engages with a slip ring associated with the rotor. The current measuring module further comprises: a first current measuring device mounted with respect to the electrical pickup to detect current flowing at least through the electrical pickup; and a second current measuring device mounted with respect to the electrical pickup to detect current flowing through at least a component associated with the gearbox output shaft.