Small-size current transformer

Abstract

The invention relates to the field of power transformation, in particular to a small-size current transformer. The small-size current transformer comprises a P2 connecting terminal, a primary coil, secondary coils, a P1 connecting terminal and an insert. The P1 connecting terminal of the small-size current transformer is welded with a U-shaped transition panel to connect the primary coil. The primary coil passes through the secondary coils and is welded with the P2 connecting terminal after fulfilling the number of turns. Each secondary coil is of a circular structure and three secondary coils are arranged in the shape like a Chinese character 'Ping', wherein the right secondary coil and the left secondary coil are arranged horizontally, and the lower secondary coil, the right secondary coil and the left secondary coil are vertical to one another; and the secondary coils are uniformly wound by a varnished wire on an iron core. The outgoing lines of the secondary coils are respectively welded on the insert according to polarity and the terminal identifier of the secondary outgoing line is determined according to winding quantity and transformation ratio condition. Epoxy resin is primarily fully-closed poured in the current transformer.

Description

technical field [0001] The invention relates to the field of power transformation, in particular to a small current transformer. Background technique [0002] The current transformer currently used in the switchgear has a large volume and occupies a large space due to its large size. This is mainly caused by the unreasonable arrangement of the iron core positions inside the current transformer and the unreasonable use of space. At the same time, most current transformers of the same type are of semi-closed structure. Semi-closed current transformers have to be coated with semi-conductor paint due to the leakage of the iron core, large magnetic flux leakage, and substandard partial discharge, which greatly shortens the service life of the product. Therefore, it is necessary to develop a new small fully enclosed transformer to solve the existing technical problems. Contents of the invention [0003] In view of the defects in the prior art, the purpose of the present invent...

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Problems solved by technology

[0002] The current transformer currently used in the switchgear is too large to cause the switchgear to be large in size and occupy a large space

This is mainly caused by the unreasonable arrangement of the iron core position inside the current transformer and the unreasonable use of space.

At the same time, most current transformers of the same type are of semi-closed structure. Due to the leakage of the iron core, semi-closed current transformers also need to be painted with semi-conductor paint, resulting in large magnetic flux leakage and substandard partial discharge, which greatly shortens the service life of the product.

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