Current sampling power frequency anti-magnetic electric energy meter

Abstract

The invention relates to a current sampling power frequency anti-magnetic electric energy meter, which comprises a manganin shunt (1), a first current sampling module (21) connected with the manganinshunt (1) for acquiring current signals formed on the manganin shunt (1) and a control module (4) receiving the information acquired by the first current sampling module (21) for analysis and processing, and is characterized in that the manganin shunt (1) and the first current sampling module (21) are connected through a cross loop B. In comparison with the prior art, the magnetic field generateddue to the self structure of the electric energy meter in the case of interference of an external power frequency magnetic field can be effectively reduced, accurate sampling is thus ensured, and themetering precision is improved.

Description

technical field [0001] The invention relates to an electric energy meter, in particular to an electric energy meter with current sampling power frequency antimagnetic technology. Background technique [0002] The energy meter is a commonly used instrument for measuring electricity, but the magnetic field interference of the alternating current makes the counting accuracy of the energy meter not high, making it impossible to accurately measure the user's electricity consumption. In order to solve the above problems, researchers have made a lot of improvements to the energy meter. [0003] For example, a manganin shunt disclosed in patent 1 invention CN202661496U, the patent improves the manganese-copper connection structure in the electric energy meter accessories, two lead wires are respectively welded to the two terminals on the manganese-copper sheet, and the two lead wires are wound. Arrangement is carried out to reduce the area of ​​the current loop loop between the two...

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Problems solved by technology

[0005] Although the above-mentioned patents have reduced the magnetic field interference to a certain extent, since the conventional electric energy meter manganese-copper sheet has three terminals, the area between terminal 2 and terminal 3 will form the loop area of ​​the manganese-bronze sheet itself, which will generate electromagnetic interference. The helical structure of the lead wire of the first one cannot offset the magnetic field of this part, and at the same time, the loop area of ​​the manganin sheet will be increased due to the gap between the lead wire and the terminal, resulting in unsatisfactory anti-interference effect; although the second patent can avoid manganese to a certain extent The magnetic field interference of the copper sheet itself has high requirements for the design and structure of the manganin sheet, which is not universal and increases the manufacturing cost

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