Abstract:
Bobina de Rogowski y procedimiento para medir la corriente que circula por un conductor mediante dicha bobina, comprendiendo la bobina de Rogowski(10) un tubo (1) de sección sustancialmente constante, con un primer extremo y un segundo extremo, estando adaptado el tubo (1) para que sus extremos puedan aproximarse entre sí para formar un lazo toroidal en una situación de uso, y una pluralidad de conductores eléctricos (2, 3), comprendiendo cada conductor eléctrico (2, 3) al menos un hilo conductor (2A, 3A), estando los hilos conductores aislados eléctricamente entre sí, en donde los conductores eléctricos (2, 3) verifican que están arrollados sobre la superficie exterior del tubo (1), con el mismo número de conductores arrollados en sentido horario (2) y en sentido anti-horario (3), que están distribuidos uniformemente sobre el tubo (1), y que están entretejidos los conductores arrollados en sentido horario (2) con los conductores arrollados en sentido anti-horario (3).
Abstract:
The invention is about an arrangement for measuring a current, with a current transducer of the Rogowski type (9) and a transducer electronics (13), wherein the current transducer (9) has a primary conductor winding (14) having a first number of loops (N1) for carrying the rated current (i R (t)) to be measured, a secondary conductor winding (16) having a pair of second terminals (17, 18) and a helical shape and a second number of loops (N2), said secondary conductor winding (16) encircling the primary conductor (14) in a toroidal manner, characterised by a third conductor winding (10) having a pair of third terminals (11, 12) with a third number of loops (N3), wherein the third conductor winding is adapted to receive a calibration current signal (i cal (t)), wherein the secondary conductor winding (16) is adapted to induce between its pair of second terminals (17,18) a voltage signal V S ' said voltage signal V S ' containing the coil sensitivity S and being a superposition of a rated current voltage signal (V S ), in response to the derivative of the rated current (di R (t)/dt), and an additional calibration signal (V cal ) in response to the derivative of the calibration current signal (i cal (t)), and the transducer electronics (13) being adapted to amplify both the current voltage signal (V S ) and the calibration signal (V cal ) in the same amplifier and to divide the amplified current voltage signal by that part of the amplified calibration signal that contains the coil sensitivity and the gain.
Abstract:
A method for machine diagnosing and condition monitoring of a machine set mechanically coupled with an alternating-current electric machine, comprising the steps of sensing at least one parameter of the electric machine by using a Rogowski coil (RC) looped on at least one of the feed wires of the electric machine (EM) as a sensor; evaluating the sensed parameter by measuring a so called magnetic tension signal being proportional to the derivative of the current of the alternating-current electric machine (EM) at the output of the Rogowski coil (RC); analyzing said signal in time and frequency domains; providing the magnetic tension spectra; and on basis of the magnetic tension spectra, identifying fault frequencies characteristic for the operation of the electric machine (EM) and the coupled machine set. In the apparatus for machine diagnosing and condition monitoring of a machine set mechanically coupled with an alternating-current electric machine the feed wires of the electric machine (EM) are surrounded by Rogowski coils (RC) and the apparatus comprises a signal processing unit (DSP) producing a DFT/FFT spectra of the magnetic tension signal of the Rogowski coil (RC) looped around the feeding cables of the AC machine.
Abstract:
A sensor assembly includes an electrical conductor, at least one of a voltage sensor and a current sensor disposed about the electrical conductor, and a first insulator molded about the electrical conductor. The first insulator includes a plurality of structures structured to maintain concentricity between the electrical conductor and the at least one of the voltage sensor and the current sensor. A second insulator is molded about the first insulator and the at least one of the voltage sensor and the current sensor.
Abstract:
A device and method are provided for monitoring voltage and current in a continuous conductor. A current sensor is configured to sense current in the continuous conductor. A voltage sense conductor is provided and a guided path is configured to bring the voltage sense conductor into contact with the continuous conductor at a pre-determined orientation. A communication interface is configured to receive information about a common reference voltage from a source, the source being external to the device. A voltage measuring circuit is configured to estimate voltage between a voltage sensed by the voltage sense conductor and the common reference voltage using the information about a common reference voltage.e
Abstract:
A sensor assembly includes an electrical conductor, at least one of a voltage sensor and a current sensor disposed about the electrical conductor, and a first insulator molded about the electrical conductor. The first insulator includes a plurality of structures structured to maintain concentricity between the electrical conductor and the at least one of the voltage sensor and the current sensor. A second insulator is molded about the first insulator and the at least one of the voltage sensor and the current sensor.
Abstract:
Current measuring device (1) for electric lines, comprising: a supporting structure (3) provided with at least one through opening (4', 4"), and a first solenoid (5) and a second solenoid (6) of conductive material arranged on the supporting structure (3), developing as a ring around the through opening (4', 4") and electrically connected in series. The first solenoid (5) is obtained with first turns (7) wound around a first core (1 1) of the supporting structure (3) developing as a ring around the opening (4', 4"), and with second turns (8) wound around a second core (12) of the supporting structure (3) developing as a ring around the opening (4', 4") parallel to the development in the form of a ring of the first core (1 1). Moreover, the second solenoid (6) is obtained with third turns (9) wound around the first core (11) of the supporting structure (3), and with fourth turns (10) wound around the second core (12) of the supporting structure.
Abstract:
The present invention relates to a Rogowski coil assembly (1) for measurement of high frequency electrical currents comprising coil segments (3) disposed in series with retrospective impedance influence reduction coupling.
Abstract:
A current sensing mechanism for use in an integrated circuit is described. In one embodiment, the integrated circuit comprises a voltage supply rail and a current sensor coupled to that voltage supply rail such that the current sensor determines the current passing through the voltage supply rail. Leads attached to the current sensor can be monitored to obtain measurements that permit determination of the current.
Abstract:
Capteur de courant à boucle Rogowski comprenant un bobinage (4) s'étendant entre deux extrémités (14, 16) configuré pour pouvoir être disposé autour d'un conducteur primaire dans lequel un courant à mesurer circule en séparant et en rapprochant lesdites extrémités. Le capteur comprend en outre un mécanisme de fermeture (18) disposé aux extrémités du bobinage, comprenant un corps (20) ayant une grande perméabilité magnétique s'étendant entre lesdites extrémités quand la boucle est fermée.