Impedance matching element for voltage and/or current sensing devices
First Claim
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1. A current and/or voltage sensing device for integration with electric systems, the sensing device comprising:
- at least one magnetic field sensor and/or at least one electric field sensor, the electric field sensor and/or the magnetic field sensor being connected with an impedance matching element configured for connection to an independent analogue measuring device; and
an energy harvester for providing a stable power supply to the impedance matching element as part of the impedance matching element;
wherein the energy harvester is part of a cable connection connecting the sensing device with the measuring device; and
wherein the energy harvester comprises a primary capacitance between a primary conductor and a first capacitive electrode and a secondary capacitance between the first capacitive electrode and a second capacitive electrode.
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Abstract
An impedance matching element is disclosed which can be used for voltage and/or current sensing or indicating devices used in medium voltage systems in order to improve signal integrity of output signals in comparison with known sensing devices. To enhance sensing accuracy and provide higher output signal immunity against interferences and impedance mismatches, the electric field sensor and/or the magnetic field sensor can be connected to the impedance matching element which allows connection to an independent analog measuring device and is powered from an energy harvester, with an impedance matching electronic board.
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Citations
20 Claims
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1. A current and/or voltage sensing device for integration with electric systems, the sensing device comprising:
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at least one magnetic field sensor and/or at least one electric field sensor, the electric field sensor and/or the magnetic field sensor being connected with an impedance matching element configured for connection to an independent analogue measuring device; and an energy harvester for providing a stable power supply to the impedance matching element as part of the impedance matching element; wherein the energy harvester is part of a cable connection connecting the sensing device with the measuring device; and wherein the energy harvester comprises a primary capacitance between a primary conductor and a first capacitive electrode and a secondary capacitance between the first capacitive electrode and a second capacitive electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification