Small novel current transformer with wide input range

Abstract

The invention provides a small novel current transformer with a wide input range, which comprises at least two frameworks with a cavity inside, wherein the frameworks are provided with a spacing therebetween and connected by alloy sheets, each framework is provided with a winding, and the windings forms a closed magnetic circuit together with the alloy sheets. Compared with the existing current transformers, the alloy sheets are connected to the frameworks, and the internal part of each framework is a cavity, thereby playing a role of an air magnetic core. The whole small novel current transformer with the wide input range is low in magnetic conductivity, and the magnetic flux is not easy to reach the saturation point, so that the measurement range of the novel current transformer is larger than that of the traditional current transformer, and the volume is smaller. The magnetic flux of air in the cavities is enhanced due to the application of the alloy sheets, thereby enhancing the output of small current signals, and improving the accuracy of the small current signals.

Description

Technical field [0001] The invention relates to the technical field of transformers, in particular to a new type of current transformer with a small size and wide input range. Background technique [0002] The current transformer is made on the principle of electromagnetic induction. At present, the current transformers in the instruments used to measure current on the market are composed of closed-loop magnetic cores and windings. The use of high permeability magnetic core materials can effectively transmit current signals. When the magnetic core is not saturated, the current mutual inductance There is a good linear relationship between the input signal in the device and the output signal transmitted, and the current conversion accuracy is high, but the magnetic core with high permeability is easy to reach the magnetic saturation state. Once the magnetic core reaches saturation, the input signal and output signal It is no longer a linear ratio, and the larger the range of value...

AI Technical Summary

Problems solved by technology

At present, the current transformers in the instruments used to measure current on the market are composed of closed-loop magnetic cores and windings. The selection of high-permeability magnetic core materials can effectively transmit current signals. When the magnetic core is not saturated, the current mutual inductance There is a good linear relationship between the input signal in the converter and the transmitted output signal, and the current conversion accuracy is high, but the magnetic core with high magnetic permeability is easy to reach the magnetic saturation state. Once the magnetic core reaches saturation, the input signal and output signal It is no longer linearly proportional, and the larger the value range to be measured, the larger the volume of the magnetic core, so that the existing current transformer has a large size

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