Current transformer and preparation method thereof

Abstract

The invention belongs to the technical field of power equipment, and discloses a preparation method of a current transformer. The method comprises the steps of (1) embedding a magnet into a base for placing an aluminum nameplate in a die cavity, (2) placing the aluminum nameplate on the magnet to allow one side printed with letters of the aluminum nameplate to be contacted with the magnet and placing an iron sheet on the other side of the aluminum nameplate, and (3) assembling and casting a transformer coil and other accessories according to a traditional casting technology of the current transformer. The prepared current transformer comprises a casting housing, the aluminum nameplate with the periphery coated in the casting housing, the iron sheet bonded with the aluminum nameplate, and the transformer coil arranged in the casting housing. The aluminum nameplate is fixed by the magnet and the iron sheet, so that the aluminum nameplate is free from movement and deviation in a casting process, and the production efficiency is high; and a bending end can increase the contact area of the end part of the iron sheet and the casting housing, so that deformation and cracking of the casting housing generated by a thrust force on the casting housing due to addition of the iron sheet are effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of electric equipment, and in particular relates to a current 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. There are many types of current transformers, and their models and other parameters are usually indicated on their aluminum nameplates. The aluminum nameplate of the traditional current transformer is cast and formed, and then the aluminum nameplate is riveted on the surface of the current transformer by rivets. This method of fixing the aluminum nameplate is convenient to produce, but there are relatively many disadvantages. The main disadvantage is that the aluminum nameplate is easy to be lifted and replaced, which affects the billing accuracy of the power supply part and achieves the purpose of stealing electricity; therefore, the power supply par...

AI Technical Summary

Problems solved by technology

This method of fixing the aluminum nameplate is convenient to produce, but there are relatively many disadvantages. The main disadvantage is that the aluminum nameplate is easy to be lifted and replaced, which affects the billing accuracy of the power supply part and achieves the purpose of stealing electricity; therefore, the power supply part Both current transformer and current transformer manufacturers are looking for a way to make the aluminum nameplate of the product and the current transformer cast as a whole, so that the aluminum nameplate of the product cannot be replaced

[0003] In the prior art, it is also about putting the aluminum nameplate into the predetermined position in the mold during the pouring process of the shell, so that the aluminum nameplate is embedded in the shell after the casting is completed, but how to place the aluminum nameplate in the mold and It is a significant disadvantage of this method to ensure that the position of the aluminum nameplate remains unchanged during the casting process of the shell

The aluminum nameplate is fixed by the above pouring molding method, and the aluminum nameplate will move during the pouring process (even if there are positioning holes on the nameplate and matching positioning rods are set on the mold, the nameplate may also move during the pouring process), Often the aluminum nameplate is skewed in the finished product, which greatly affects the appearance of the product, and even causes the shell to crack, causing the product to be scrapped and the production efficiency to drop.

Images