Hard-connection anti-interference shunt and electric energy meter

Abstract

The invention discloses a hard-connection anti-interference diverter and an electric energy meter, and solves the problem that in the prior art, due to the fact that a twisted pair is adopted to interfere induced current, the metering precision of the electric energy meter seriously deviates, and the hard-connection anti-interference diverter is characterized in that a sampling resistor disc is provided with a first sampling pin, a second sampling pin and a third sampling pin; the first sampling pin and the second sampling pin are arranged on the same side of the sampling resistor disc; the first sampling pin is formed by upwards protruding and extending a sampling resistor disc, the sampling resistor disc upwards protrudes and extends a first L-shaped structure, and then the first L-shaped structure upwards protrudes and extends a longitudinal structure parallel to the first sampling pin to form a second sampling pin. Space size matching design improvement is carried out, it is ensured that the magnetic fluxes of the two areas in the magnetic field are equal all the time under the condition that the flow passing area of the shunt does not need to be changed, induced currents offset each other, and the measurement precision of an instrument is truly guaranteed.

Description

technical field [0001] The invention relates to the technical field of electric energy meters, in particular to a hard-connected anti-interference shunt and an electric energy meter. Background technique [0002] At present, there are many types of shunts, and the anti-interference products are all made by symmetrically designing holes in the shunt to offset the magnetic field interference of the shunt itself. Although it can achieve a certain effect, the flow area of ​​the shunt is affected. Certain impact, and the link between the shunt and the metering equipment is a twisted pair, the number of turns and symmetry of the twisted pair are very important, and there is also asymmetry at the link point at both ends of the twisted pair, which will cause greater interference The space cannot be offset. In the case of external magnetic field interference, the sampling value of the metering equipment will be affected, the metering accuracy will decrease, and even serious deviation...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to overcome the problem that the interference of the twisted pair wires to the induced current in the prior art causes serious deviations in the metering accuracy of the electric energy meter, and provides a hard-connected anti-interference shunt and electric energy meter to reduce the uncertainty introduced by the twisted pair wires Factors and through the improvement of space size matching design, the magnetic flux in the two areas in the magnetic field is always equal without changing the flow area of ​​the shunt, and the induced currents cancel each other out, so as to truly guarantee the measurement accuracy of the instrument

[0005] The second purpose of the present invention is to overcome the problem that the structure of the two sampling pins in the prior art makes it difficult to install in the electric energy meter, and the installation process will also affect its accuracy. Through the improvement of the space size matching design, the structure is compact, After the circuit board is installed, the space is fixed, there are no uncertain and unstable factors, and the installation process is simple

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