Abstract: A flexible current sensor comprising a sensing coil wound on a cylindrical flexible core where the sensing coil comprises two in series connected overlapping windings wound along the cylindrical flexible core in mutually opposite direction. The cylindrical flexible core comprises a plurality of individual fibers from a nonmagnetic material arranged into the nearest approximation of a cylindrical shape and the sensing coil is equipped with a nonconductive separation layer located between its windings.

Abstract: A sensor of electric current including a fiber (1) from a soft magnetic material with a uniform cross-sectional area and uniform magnetic properties along its whole length, equipped with an excitation coil (2) wound on said fiber (1) with a uniform winding density along the substantially whole length and possibly equipped with a sensing coil (3) wound on said fiber (1) with uniform winding density along the substantially whole length, where said fiber (1) ends are mechanically joined to form a loop enclosing the measured current carrying conductor (4) by said fiber (1), wherein said excitation coil (2) is connected to the current output of a current source (5) through a current transducer (6) generating a current signal corresponding to the excitation current flowing through said excitation coil (2) wherein the sensor is equipped with a voltage transducer (7) generating a voltage signal corresponding to the voltage on the possibly present sensing coil (3) or on the excitation coil (2) wherein said voltage sig

Abstract: A flexible current sensor including a sensing cable with a sensing coil wound on a cylindrical flexible core and electrical shielding located over said sensing coil and an outer isolation coat. The electrical shielding includes a plurality of individually isolated shielding wires arranged into groups wound in mutually opposite directions and/or the sensing coil includes a plurality of individually isolated sensing wires arranged into groups wound in mutually opposite directions.

Abstract: A flexible current sensor including a sensing cable with a sensing coil wound on a cylindrical flexible core and electrical shielding located over said sensing coil and an outer isolation coat. The electrical shielding includes a plurality of individually isolated shielding wires arranged into groups wound in mutually opposite directions and/or the sensing coil includes a plurality of individually isolated sensing wires arranged into groups wound in mutually opposite directions.

Abstract: Circuit arrangement for simultaneous testing of electricity meters with interconnected current and voltage circuits comprising plurality of said meters having all voltage terminals associated with the same phase connected parallel to respective voltage source and each of the current terminal pairs of the meters connected to the output of individual zero flux current transducer (ZFCT). The inputs (IW) of the zero flux current transducer, the outputs of which are associated with the same phase of individual meters, are connected in series to a respective current source (I). The zero flux current transducer consists of an input winding (IW), an output winding (OW), a sense winding (SW), a drive winding (DW), a sense core (SC), a drive core (DC) and an amplifier (A). The drive winding comprises the drive core only and the input, output and sense windings comprise both sense core and drive core.

Abstract: Circuit arrangement for simultaneous testing of electricity meters with interconnected current and voltage circuits comprising plurality of said meters having all voltage terminals associated with the same phase connected parallel to respective voltage source and each of the current terminal pairs of the meters connected to the output of individual zero flux current transducer (ZFCT). The inputs (IW) of the zero flux current transducer, the outputs of which are associated with the same phase of individual meters, are connected in series to a respective current source (I). The zero flux current transducer consists of an input winding (IW), an output winding (OW), a sense winding (SW), a drive winding (DW), a sense core (SC), a drive core (DC) and an amplifier (A). The drive winding comprises the drive core only and the input, output and sense windings comprise both sense core and drive core.

Abstract: A thermoelectric measurement converter is disclosed, which forms the output signal as the product of the instantaneous values of two input signals; wherein the measurement converter comprises at least one electronic resistor and at least one temperature sensor, both being disposed on a common base which is heat insulated with respect to the environment.