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Manganin current sampling device resisting outside magnetic field interference

A current sampling and magnetic field technology, applied in the direction of measuring current/voltage, instruments, measuring electrical variables, etc., can solve the problems of reducing loop area, uncertain interference, inaccurate sampling, etc., to achieve the effect of magnetic field interference

Inactive Publication Date: 2013-01-02
HANGZHOU SUNRISE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Manganin current sampling device resisting outside magnetic field interference
  • Manganin current sampling device resisting outside magnetic field interference

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Such as figure 1 , 2 As shown, a manganese copper current sampling device resistant to external magnetic field interference includes a manganese copper sheet 1. A closed ring 2 is provided at the center of the symmetry axis of the manganese copper sheet 1, and two sampling points are provided in the closed ring 2 to close The ring includes a square, ring or I-shape, and a sampling point is provided on each of the left and right sides of the closed ring 2. The sampling points on the left and right sides of the closed ring 2 are connected with the metering device 3 through sampling lines.

[0015] The technical method adopted is to use the principle of signal superposition to superimpose an interference signal opposite to the interference signal, so that two signals, one positive and one negative, are superimposed to cancel the interference. The device uses manganese copper as a raw material and makes full use of the advantages of manganese copper. At the same time, the gene...

Embodiment 2

[0018] Test the manganese copper current sampling device against the interference of external magnetic field and ordinary manganese copper current sampling device:

[0019] One. Power frequency magnetic field interference test of 120 ampere-turn coil

[0020] 1 Test requirements:

[0021] Under the magnetic field intensity of 120 ampere-turn power frequency magnetic field interference, the electric energy meter is placed in the most sensitive place of the magnetic field intensity interference for no-load test. The electric energy meter should not produce more than one pulse output;

[0022] 2 Test conditions:

[0023] 2.1 The electric energy meter adds rated voltage, no current;

[0024] 2.2 1m 2 Square magnetic field coil with a magnetic field strength of 120 ampere turns;

[0025] 2.3 The electric energy meter is moved near the wire on one side of the coil, looking for the most sensitive point, and observing the power change;

[0026] 3 Test results:

[0027] Test data of m...

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Abstract

A manganin current sampling device resisting outside magnetic field interference comprises a manganin slice. A seal ring is arranged at the position of the center of the symmetrical axis of the manganin slice, and two sampling points are arranged in the seal ring. The manganin current sampling device has the advantages that an interfering signal opposite to an interfering signal is overlaid against the interfering signal, the interference is offset by mutual superposition of a positive signal and an inverted signal, manganin is utilized to serve as a raw material of the device, a hole is opened along the center of the symmetrical axis of the manganin slice, so that two connected and symmetric manganin components are formed on two sides of the symmetrical axis of the manganin slice similarly, a sampling outgoing line is led out to perform sampling along the symmetrical axis from the position inside the opened hole, the seal ring which is square, annular or in other shapes is arranged at the position of the center of the symmetrical axis of the manganin slice, the two sampling points of small signals are arranged in the seal ring, the whole manganin slice is equivalent to the two components which are consistent in current direct and opposite in eddy and electromagnetic loops, and accordingly offset of the magnetic field interference is achieved.

Description

Technical field [0001] The invention relates to a manganese copper current sampling device resistant to external magnetic field interference, in particular to a manganese copper current sampling device resistant to external magnetic field interference in the field of electric energy meters. Background technique [0002] The current sampling components of current electronic energy meters, especially single-phase electronic energy meters, generally use manganin. 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. The large current signal is converted into a small voltage signal through the impedance of the manganin itself, thereby realizing current sampling . This device has a history of several decades as a current sampling device of an electronic electric energy meter, especially a sampling device of a single-phase electric energy meter, and is ...

Claims

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Application Information

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IPC IPC(8): G01R19/00G01R15/00
Inventor 刘峥嵘姜干才江少辉
Owner HANGZHOU SUNRISE TECH
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