Glue filling method of three-phase current mutual inductor and mutual inductor thereof

Abstract

The invention provides a glue filling method of a three-phase current mutual inductor. An aluminum barrel, seal rings and a plurality of mutual inductor coils are provided, wherein the outer diameter of the aluminum barrel is less than the inner diameter of the mutual inductor coils. The glue filling method includes; a pre-fixing step, stacking the mutual inductor coils on the aluminum barrel, arranging the seal rings between the adjacent mutual inductor coils, arranging the mutual inductor coils, the seal rings and the aluminum barrel concentrically, forming glue clearances between the adjacent mutual inductor coils and between the aluminum barrel and the mutual inductor coils, and forming a circular glue hole for communicating the glue clearances between an inner wall of the top mutual inductor coil and an outer wall of the aluminum barrel; a glue filling step, filling glue in the circular glue hole; a solidifying step, waiting solidification of the glue; and a demoulding step, removing the aluminum barrel and the seal rings from the mutual inductor coils, and forming a three-phase current mutual inductor. The method can improve the stability of the e current mutual inductor.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to a glue filling method for a three-phase current transformer and the transformer. Background technique [0002] The principle of current transformer is based on the principle of electromagnetic induction. A current transformer consists of a closed core and windings. Its primary winding has very few turns, and it is connected in series in the line of the current to be measured, so it often has all the current of the line flowing, and the secondary winding has a large number of turns, connected in series in the measuring instrument and the protection circuit, and the current mutual inductance When the transformer is working, its secondary circuit is always closed, so the impedance of the measuring instrument and the series coil of the protection circuit is very small, and the working state of the current transformer is close to a short circuit, so as to achieve the purpose of ...

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Problems solved by technology

Its primary winding has very few turns, and it is connected in series in the line of the current to be measured, so it often has all the current of the line flowing, and the secondary winding has a large number of turns, connected in series in the measuring instrument and the protection circuit, and the current mutual inductance When the transformer is working, its secondary circuit is always closed, so the impedance of the measuring instrument and the series coil of the protection circuit is very small, and the working state of the current transformer is close to a short circuit, so as to achieve the purpose of detection, and it is generally used in high-voltage current detection The current transformer of the current transformer has a large volume due to the large number of turns, and in order to ensure the stability and isolation of the entire transformer structure, the transformer coils are fixed by the pressing process of the pressure plate, and the process is complicated and costly. High, and the fixing effect is not good, which affects safety

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