Alternating magnetic field-resistant manganin current divider

Abstract

The invention designs an alternating magnetic field-resistant manganin current divider, which mainly comprises a manganin resistor and sampling end points of a current divider, wherein a wire is arranged on one side of the current divider; a sampling end point is arranged on both sides of the current divider and is connected with a sampling line; the sampling line on one side is pulled to the other side; and the manganin resistor is divided into two regions of the same area; meanwhile, the sampling line is fixed with the sampling line on the side and the two sampling lines are spirally stranded to extend. In the alternating magnetic field-resistant manganin current divider, the sampling line on the side close to the manganin resistor is pulled to the other side close to the manganin resistor, and the manganin resistor is averagely divided into two regions of the same area, so that induction voltage and electromotive force are produced on the sampling line on the other side close to the manganin resistor according to faraday law of electromagnetic induction when the current divider is interfered by an external alternating magnetic field and are balanced with the induction voltage and the electromotive force produced on the manganin resistor, namely the interference of the alternating magnetic field on the current divider can be prevented.

Description

technical field [0001] The invention relates to electrical measuring components, in particular to a manganin shunt against alternating magnetic field. Background technique [0002] Shunts are widely used to expand the measuring current range of instruments, and can be used for backflow, current limiting, and current equalization sampling detection of communication systems, electronic complete machines, and automatic control power supplies. The main feature of the shunt is a low resistor on which the sampling terminal is placed. The traditional shunt uses the sampling line to sample the voltage and current flowing through the manganin shunt, and there is no special requirement for the winding method of the sampling line and the position of the sampling terminal. Under normal circumstances, using this method for voltage and current sampling has no effect, but this shunt is easily disturbed by the external alternating magnetic field, which greatly affects the sampling accuracy...

AI Technical Summary

Problems solved by technology

Under normal circumstances, using this method to sample voltage and current has no effect, but this shunt is easily disturbed by the external alternating magnetic field, which greatly affects the accuracy of sampling and cannot work normally.

[0003] Manganin shunts are widely used in high-precision components for voltage and current sampling in various instruments and meters, especially manganin shunts used for sampling components used in electronic energy meters to measure electric energy; The voltage generated by the power drop is measured and sampled by the energy meter, and the generated voltage is generally in the millivolt level, which is particularly susceptible to interference by the transformer and transformer alternating magnetic field in the electric energy meter; and the external alternating magnetic field interference causes the sampling signal Electric energy cannot be accurately measured, especially some criminals who steal electricity use alternating magnetic fields to interfere with the normal operation of electric energy meters, thereby stealing electricity

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