Abstract:
A current sensor includes one or more inductors that generate a sensed output current responsive to a current in a conductor when the one or more inductors are inductively coupled to the conductor. The current sensor includes an integrated circuit die including an integrator circuit coupled to the one or more inductors for generating a sensed voltage responsive to the sensed current, the sensed voltage indicative of the first current in the conductor. The inductors may be formed in the integrated circuit and the conductor may incorporated into the package holding the die.
Abstract:
Flexible current sensor in form of sensing cable consisting of sensing coil wound on cylindrical flexible core, electrical shielding located over said sensing coil and outer isolation coat equipped with mechanical coupling system for either fixing or releasing said sensor cable ends to and from mutually closed position, wherein said electrical shielding consist of plurality of individually isolated shielding wires arranged into groups wound in mutually opposite direction and/or said sensing coil consist of plurality of individually isolated sensing wires arranged into groups wound in mutually opposite directions. Said shielding wires are mutually electrically interconnected in parallel, wherein each shielding wire has only one connection point. Said sensing wires, respective to voltages induced in sensing wires by magnetic field of sensed current, are electrically interconnected in series or in parallel or combination of series and parallel or some sensing wires are idle, wherein interconnection configuration of sensing wires is determined by required sensitivity, impedance and frequency range of said current sensor.
Abstract:
An apparatus for the detection of a current in a protection and metering current range comprises one current sensor (1), which generates a voltage signal, and a voltagelimited electronic element (7). For metering voltage signals exceeding the upper metering voltage limit of the electronic element or for protection voltage signals exceeding the upper protection voltage limit of the electronic element an attenuation element (3) with an attenuationn factor being larger than unity is electrically connected to the current sensor (1). The attenuation factor is chosen in such a way that the metering voltage signal divided by the attenuation factor is smaller than or equal to the upper electronic element metering voltage limit or the protection voltage signal divided by the attenuation factor is smaller than or equal to the upper electronic element protection voltage limit.
Abstract:
Bei einem Ringkern-Stromwandler mit einem Primärleiter, der den Ringkern durchquert, sowie mit einer um den Ringkern gewickelten Sekundärwicklung, ist sekundärseitig ein Messshunt (R sh ) oder eine Bürde ( Z b ) vorgesehen. Zur Kompensation des Phasenfehlers (φ) zwischen Primärstrom ( I p ) und dem Sekundärstrom ( I s ) ist sekundärseitig eine Kompensationsschaltung (K) vorgesehen, deren Kapazität (C) im wesentlichen nach der Gleichung (I) bzw. (II) bemessen ist, wobei C die Kapazität der Kompensationsschaltung, ω die Kreisfrequenz, φ den Phasenfehler zwischen Primär- und Sekundärstrom, R sh den Widerstand eines allfälligen Messshunts und Z b die Impedanz einer allfälligen Bürde bedeuten.
Abstract translation:与横穿环形磁芯,并与周围的环形磁芯次级缠绕的线圈在次级侧绕组的测量分流(R SH SUB>)或负担(Z B'/ SUB初级导体的环形空心电流互感器 >)
Abstract:
A method and apparatus for determining a voltage potential in a power switching device. The method and apparatus uses a conductive shield surrounding a coil positioned around a connector in a power switching device. The coil is used to provide a current measuring device within the power switching device. The combination of the shield, connector and the dielectric between them forms a capacitor, which is the high voltage leg of a capacitive voltage divider circuit. The capacitive voltage divider has a low voltage leg made of one or more capacitors. The capacitors of the low voltage leg may be removed in order to adjust the output of the capacitive voltage divider. The output of the voltage divider circuit is measured, converted and displayed to a user.
Abstract:
Current testing/measuring apparatus (10) comprises a flexible member (12) having a first end (14) and a second end (16). In use, the flexible member (12) is arranged to locate around a conductor (11) carrying a current to be measured. In particular, the current measuring apparatus (10) comprises a Rogowski coil. The ends of the flexible member (12) are coupled together in use but a gap is created between the ends. This distance can generate errors in the current measurement and the present invention provides compensation means (28) in the form of a compensation windings. The compensation windings (30) comprise a planar spiral conductor provided on a printed circuit board to compensate for the separation distance between the first end and the second end.
Abstract:
Es wird eine Umrichterschaltung mit einem für jede Phase (R, S, T) vorgesehenen und über eine Verschienung (1) parallel zu einem Gleichspannungskreis geschalteten Zweigpaar angegeben, wobei jedes Zweigpaar aus mindestens zwei in Serie geschalteten Leistungshalbleiterschaltern gebildet ist. Zur Kurzschlussstromdetektion umfasst die Umrichterschaltung eine Einrichtung, wobei die Einrichtung eine Erfassungseinheit und eine für jedes Zweigpaar vorgesehene und mit der Erfassungseinheit verbundene Messschleife (7) aufweist. Die Messschleife (7) ist derart angeordnet, dass ein durch einen in der Verschienung (1) und in den Leistungshalbleiterschaltern des zugehörigen Zweigpaares fliessenden Strom (I) erzeugtes Magnetfeld (H) eine von einer Windung (8) der Messschleife (7) eingeschlossene Fläche (A) zumindest teilweise durchdringt.
Abstract:
A method and/or apparatus for measuring current in a high voltage (HV) current carrier generates a low voltage signal proportional to the current in the HV carrier and applies this signal to an integrated-optic voltage sensor located in the HV environment adjacent to the HV current carrier to produce a modulated optical signal representative of the current being measured. The optical signal from the integrated-optic voltage sensor is conducted to a low voltage (LV) environment insulated from said HV environment and processed to provide a second electrical signal. One of the electrical signals is integrated so that an output signal of the required accuracy is available form the system.
Abstract:
A Rogowski coil measures a current in a conductor and includes first and second loops electrically connected in series with each other. The first loop is wound with a substantially constant winding density in a first direction around a first core that has a substantially constant cross section. The second loop is wound with a substantially constant winding density in a second direction around a second core that has a substantially constant cross section. A direction of the first loop cross section is substantially perpendicular to the normal of the first core cross section. Moreover, a direction of the second loop cross section is substantially perpendicular to the normal of the second core cross section.
Abstract:
The invention concerns a coil comprising an insulating support (1) and a conductor wire (3) coiled on the support of an initial end (1l) to a terminal end (1F) to form a first winding (5) with contiguous turns (5A). The conductor wire is then coiled on the insulating support (1) of the terminal end (1F) towards the initial end (1l) of the support to form a second winding (7) with contiguous turns (7A) superposed on the first winding (5). The second winding (7) is centred relative to the choking coil centre to compensate the large turn formed by the choking coil itself, thereby protecting the choking coil against stray magnetic fields. Advantageously, a second conductor wire (4) is coiled around the support to form a third winding (9) with turns (9A) superposed on the first and second windings, and for injecting a test current to calibrate the choking coil in laboratory or in situ simply and economically.