Anti-interference intelligent electric meter and anti-interference method of intelligent electric meter

Abstract

The invention provides an intelligent electric meter which is capable of effectively reducing outer magnetic field interference, and provides a method of reducing the outer magnetic field interference of the intelligent electric meter. The anti-interference intelligent electric meter comprises a relay, a diverter and an electricity meter circuit board, the diverter comprises conducting plates on the two sides of the diverter and a manganin sampling plate, the relay is connected with the conducting plate on one side of the diverter, the conducting plates on the two sides are respectively connected at the two ends of the manganin sampling plate, binding posts are respectively arranged at the two ends of the manganin sampling plate, the binding posts at the two ends of the manganin sampling plate are respectively connected with the electricity meter circuit board through two-strand sampling wire, the manganin sampling plate is provided with three base planes which are perpendicular to each other in the space, the two ends of the mangnin sampling plate is distributed in a bilateral symmetry mode centering on one base plane, projected area of the mangnin sampling plate on the center base plate is larger than the projected area of the mangnin sampling plate on the other two base planes.

Description

technical field [0001] The invention relates to an anti-jamming smart meter and an anti-jamming method for the smart meter. Background technique [0002] Since manganese copper is a metal with a small temperature coefficient (that is, the change of the resistance value of manganese copper with temperature is basically negligible, for example, the resistance value of copper copper increases by four thousandths when the temperature rises by one degree). According to U=I*R, the R of manganese copper is constant, then the manganese copper sampling piece can be connected in series to the circuit, and the voltage value at both ends of the manganese copper sampling piece can be measured to feedback the magnitude of the current. We generally design the resistance of manganese copper The value is about 100 micro-ohms to 1000 micro-ohms, so the voltage across the shunt made of manganin is only 8 micro-volts to 80 micro-volts, and this micro-volt level signal can be used in metering a...

AI Technical Summary

Problems solved by technology

The existing shunt includes conductive strips on both sides and manganese-copper sampling strips. The two ends of the manganese-copper sampling strip are respectively provided with binding posts for connecting the sampling lines, and the binding posts at both ends are respectively connected to the electric meter line through two stranded sampling lines. The two ends of the manganese-copper sampling sheet are respectively connected to the conductive sheets on both sides, and the conductive sheet on one side is connected to the lead-out end of the relay. The manganese-copper sampling sheet is a whole plate structure. When there is external magnetic field interference, the sampling of manganese copper to microvolt signals is inaccurate. Even when there is no current, if there is external magnetic field interference, there will be signals at both ends of the sampling line, resulting in inaccurate measurement of the ammeter.

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