Using double manganese copper to design the circuit against external magnetic field interference

Abstract

The invention provides a circuit for resisting external magnetic field interferences by adopting dual-manganese-copper design. The circuit comprises two identically shaped and structural manganese-copper sheets and an insulation spacer, wherein the two manganese-copper sheets are a first manganese-copper sheet and a second manganese-copper sheet respectively; the first manganese-copper sheet is overlapped at the lower side of the second manganese-copper sheet; the insulation spacer is arranged between the first manganese-copper sheet and the second manganese-copper sheet; a first sampling line and a second sampling line are arranged at one side of the first manganese-copper sheet; a third sampling line and a fourth sampling line are arranged at one side of the second manganese-copper sheet; the first sampling line is connected with the fourth sampling line; and the second sampling line is connected with the third sampling line. The circuit provided by the invention has the beneficial effects that backward signals generated by space magnetic fields on the additional second manganese-copper sheet are utilized for offsetting interference signals generated by the space magnetic fields on the first manganese-copper sheet, thus offsetting magnetic field interferences.

Description

technical field [0001] The invention relates to a circuit designed with double manganese copper to resist external magnetic field interference, in particular to a circuit designed with double manganese copper to resist external magnetic field interference in the field of electronic electric energy meters. Background technique [0002] The current sampling part of the current electronic energy meter, especially the single-phase electronic energy meter, generally uses a single manganese-copper element. Because it has the characteristics of good stability and small temperature change, it can be adapted to electric energy meters and related instruments that require large current sampling, and converts large current signals into a small voltage signal through the impedance of manganese copper itself, so as to realize current sampling. . As a current sampling device for electronic watt-hour meters, especially for single-phase watt-hour meters, this device has a history of several...

AI Technical Summary

Problems solved by technology

Due to its inherent eddy current and electromagnetic induction characteristics, the current manganese copper and lead-out method will generate an interference signal superimposed on the actual sampling current in the case of external strong magnetic field interference, especially in the case of magnetic field interference at the same frequency and phase. Cause inaccurate sampling and affect the results of sampling

Due to the uncertainty of the interference, the interference is difficult to filter out by software methods

The current general practice is to reduce the loop area, increase magnetic field shielding, and keep away from magnetic field interference, etc., which cannot fundamentally solve this problem

[0004] Due to the large number of single-phase electric energy meters used in the power grid, there are a large number of similar interference sources in the installation environment of electric energy meters, resulting in abnormal measurement (anti-submarine failure) of electric energy meters when users are not using electricity and error changes under normal electricity consumption , causing a lot of trouble to users

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