Abstract:
The invention relates to a directional coupler configured to providing a forward and/or a backward signal derived from a high frequency signal. The directional coupler comprises a coupling element coupled to a main line (2), wherein the main line is configured to transporting the high frequency signal. The directional coupler further comprises a signal line (4) connecting the coupling element (3) to a measuring port (5). The signal line comprises a defected ground structure (6), wherein the defected ground structure is inserted between the coupling element (3) and the measuring port (5).
Abstract:
Die Erfindung betrifft ein Messsystem zur Messung von elektrischen Messgrößen (I1, I2, I3, U12, U23, U13) in einer elektrischen Anlage, insbesondere in einer Mittelspannungsanläge oder in einer Hochspannungsanlage, mit mehreren Sensoren (1-3, 8-10), die jeweils mindestens eine elektrische Messgröße (I1, I2, I3, U12, U23, U13) messen und ein der Messgröße (I1, I2, I3, U12, U23, U13) entsprechendes Messsignal ausgeben, sowie mit einer zentralen Auswertungseinheit (7, 14), welche die Messsignale von den Sensoren (1-3, 8-10) empfängt.
Abstract:
In a, voltage measurement apparatus high - i.e. un-attenuated - voltages are connected to an attenuator (12), which then feeds attenuated voltage waveforms to a microprocessor-based analogue-digital converter/voltage measurement circuit (14). A representative signal voltage signal (16) and: a synchronising signal (18) are then sent across an optical isolation barrier (20), and are then output to metering circuits (22). The metering circuits (22) receive analogue current inputs (24) which are sampled in synchronism with the digital voltage signals for an accurate measurement of power. Safe outputs (26) are provided which are isolated, from any dangerous voltage.
Abstract:
A current monitoring device (CMD) with a set of electromagnetic field sensors located within one or more grounded housings positioned within the combined electromagnetic fields generated by one or more electric power lines. The CMD includes electronics, typically located within the grounded housings, defining impedance networks that combine the measurements received from the field sensors to create output signal indicative of electric current values for the phase conductors. The housings can be conveniently attached and to transmission line towers, distribution line poles, and high voltage power line supports in transmission and distribution substations. The CMD controls response equipment, such as a circuit interrupter that responds to current disturbances detected by the CMD. The CMD may also include communication for sending the current values to a remote controller, such as a central control station, that implements a wide range of response equipment.
Abstract:
A current monitoring device (CMD) with a set of electromagnetic field sensors located within one or more grounded housings positioned within the combined electromagnetic fields generated by one or more electric power lines. The CMD includes electronics, typically located within the grounded housings, defining impedance networks that combine the measurements received from the field sensors to create output signal indicative of electric current values for the phase conductors. The housings can be conveniently attached and to transmission line towers, distribution line poles, and high voltage power line supports in transmission and distribution substations. The CMD controls response equipment, such as a circuit interrupter that responds to current disturbances detected by the CMD. The CMD may also include communication for sending the current values to a remote controller, such as a central control station, that implements a wide range of response equipment.
Abstract:
L'invention concerne un procédé pour déterminer les caractéristiques de la tension électrique d'une installation électrique (1) alimentée par un générateur (2). 10 Ce procédé consiste : - à générer au moins une perturbation électrique entre au moins deux points (7, 8) d'un circuit électrique (6) séparés par une couche diélectrique (9) ; 15 - à relever un premier courant électrique aux bornes d'une première impédance (12) ; - à mettre, ensuite, en contact une électrode (14) avec un point (15) de l'installation électrique (1); - à relever un second courant électrique aux bornes d'une 20 seconde impédance (16) ; - à relever l'évolution du premier courant électrique aux bornes de la première impédance (12) ; - à déterminer les caractéristiques de la tension électrique de l'installation (1) à partir de l'évolution du premier courant 25 électrique et des caractéristiques du second courant électrique. L'invention concerne, également, un dispositif (5) pour mettre en oeuvre ce procédé.
Abstract:
Differently designed measuring systems exist of which most contain a central signal processing unit and a number of electrical measuring components, and in which the measured values furnished by the measuring components are optically transmitted over optical waveguides. The aim of the invention is to provide a measuring system of this type, which has a low power consumption and enables a reliable optical data transmission. To this end, an optical loop is provided between a central measuring unit (MG) and a sensor head (SK). Microprocessors (MP1, MP2), which are situated inside the central measuring unit (MG) and inside the sensor head (SK), carry out transmitting, measuring and monitoring tasks as a distributed controller with bidirectional data communication. A frame synchronization signal serves both for supplying power as well as for deriving a clock signal for block-oriented data transmission. A data communication is carried out for conducting a parameterization and/or programming between the central measuring unit (MG) and the sensor head (SK), and a pre-preprocessing of the measured values is carried out in the sensor head (SK), particularly a measured value correction and/or a range switching and/or a reprogramming of the filtering characteristics and/or an automatic compensation are/is carried out in the sensor head (SK).
Abstract:
A high-voltage divider can be used as a portable or an in-situ device for measuring high voltages under live line conditions, the divider consisting of a high-voltage resistance (42) with a first end (46) connectable to the voltage to be tested or measured and a second end opposite the first end; a low voltage resistance (44) having a first end connected in series with the second end of a high-voltage resistance, and a second end (47) connectable to earth; and a controlling means (43) for controlling the electrical stress within the divider; the controlling means may also mitigate the effect of capacitive coupling.