CN212485123U

CN212485123U - Precise current transformer

Info

Publication number: CN212485123U
Application number: CN202021626878.3U
Authority: CN
Inventors: 蔡峰毅; 刘荣茂; 苏金土; 李金果
Original assignee: Xiamen Ztc Technology Co ltd
Current assignee: Xiamen Ztc Technology Co ltd
Priority date: 2020-08-07
Filing date: 2020-08-07
Publication date: 2021-02-05
Anticipated expiration: 2030-08-07

Abstract

The utility model provides a precise current transformer, which comprises a shell and a transformer coil, wherein a through hole in the middle of the transformer coil is penetrated by a U-shaped primary needle, and the U-shaped primary needle is fixed in the through hole of the transformer coil through a framework; a pin header is fixed outside the mutual inductor coil, and one end of the pin header is electrically connected with the mutual inductor coil; the transformer coil is encapsulated in the shell. Accurate current transformer, have compact structure, small, and assemble swift characteristics.

Description

Precise current transformer

Technical Field

The utility model relates to a current transformer preparation field, especially a precision current transformer with compact structure, small.

Background

The current transformer is an instrument for measuring by converting a large primary side current into a small secondary side current according to the electromagnetic induction principle. In each link of an electric power system, including power generation, power transformation, power transmission and distribution, lines need to be measured, protected and controlled. However, the current in the line is large and small, and the line voltage is also high, which is very dangerous if measured directly, for which reason the current transformer undertakes such a measurement. It can be seen that current transformers are of great importance in power systems.

The precision current transformer is an alternating current detection element, and detects current passing through a main circuit of the transformer during a main function. The primary line of the current for detecting the penetration of the current of the existing current transformer is generally penetrated by a primary lead wire or a primary needle. The transformer which adopts the primary lead to pass through is large in size, inconvenient in threading and high in manufacturing cost; although the transformer through which the primary needle passes is convenient to install, the size and space requirements required by the structural design are larger.

SUMMERY OF THE UTILITY MODEL

The utility model provides an accurate current transformer solves the great, higher problem of cost of manufacture of current transformer structure.

In order to solve the above problem, the utility model provides a technical scheme as follows:

a precise current transformer comprises a shell and a transformer coil, wherein a through hole in the middle of the transformer coil is penetrated by a U-shaped primary needle, and the U-shaped primary needle is fixed in the through hole of the transformer coil through a framework; a pin header is fixed outside the mutual inductor coil, and one end of the pin header is electrically connected with the mutual inductor coil; the transformer coil is encapsulated in the shell.

Furthermore, one end of the framework is a thin surface and is inserted into the shell and fixed; the middle part of the framework is provided with two semicircular shells, and the U-shaped primary needle is inserted into the through hole of the transformer coil to be fixed; the top of the framework is a plane and is provided with a clamping groove for fixing the pin header.

Furthermore, the inner side wall of the shell is provided with a convex edge, and the convex edge is used for fixing the framework and the mutual inductor coil.

Furthermore, the pin header is formed by two L-shaped metal pins which are arranged side by side in a back direction.

Compared with the prior art, the utility model has the advantages of it is following:

accurate current transformer, through designing into the U type with elementary needle to fix the row needle outside the transformer coil, make whole current transformer compact structure, small in size. Furthermore, the framework is ingenious in design, primary pins and pin headers can be fixed simultaneously, the current transformer is simple and convenient to assemble, and production efficiency is effectively improved. Accurate current transformer, have compact structure, small, and assemble swift characteristics.

Drawings

Fig. 1 is a schematic structural view of a precision current transformer according to an embodiment of the present invention.

Fig. 2 is an exploded schematic view of the precision current transformer according to the embodiment of the present invention.

Fig. 3 is a schematic view of a shell of a precision current transformer according to an embodiment of the present invention.

Detailed Description

The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention. Of course, the embodiments described below are only some embodiments of the present invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 and 2, a precision current transformer includes a housing 10, a transformer coil 20, a through hole 201 in the middle of the transformer coil 20 is penetrated by a U-shaped primary pin 21, and the U-shaped primary pin 21 is fixed in the through hole 201 of the transformer coil 20 through a framework 30; a pin header 22 is fixed outside the transformer coil 20, and one end of the pin header 22 is electrically connected with the transformer coil 20; the transformer coil 20 is encapsulated in the housing 10.

Wherein, one end of the framework 30 is a thin surface 31, and is inserted into the shell 10 and fixed; the middle part of the framework is provided with two

semicircular shells

32 and 321, the

semicircular shells

32 and 321 are inserted into the through hole 201 of the transformer coil 20 to fix the U-shaped primary needle 21, so that the U-shaped primary needle 21 stably penetrates through the through hole 201 of the transformer coil; the top 33 of the frame is a plane and has a slot 331 for fixing the pin 22.

The pin header 22 is formed by two L-shaped metal pins arranged side by side in a back direction and fixed by a fixing block to form a component, so that the assembly is facilitated.

As shown in fig. 3, a rib 101 is disposed on an inner side wall of the housing 10, and the rib 101 is used for fixing the bobbin and the transformer coil. The outer wall of the housing 10 is designed with a reinforcing rib 102, so that the strength of the whole housing 10 is improved.

The precise current transformer of the embodiment of the utility model firstly winds and packages the magnetic core to be made into a transformer coil; then, the U-shaped primary needle penetrates through a transformer coil and is fixed by a framework; arranging needles on the top of the framework; and then, putting the whole assembled transformer coil into a shell for fixing, and encapsulating the whole precise current transformer to obtain the product.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make modifications and changes without departing from the spirit and scope of the present invention.

Claims

1. A precise current transformer is characterized by comprising a shell and a transformer coil, wherein a through hole in the middle of the transformer coil is penetrated by a U-shaped primary needle, and the U-shaped primary needle is fixed in the through hole of the transformer coil through a framework; a pin header is fixed outside the mutual inductor coil, and one end of the pin header is electrically connected with the mutual inductor coil; the transformer coil is encapsulated in the shell.

2. The precision current transformer of claim 1, wherein one end of the bobbin is a thin surface, and is inserted into the housing and fixed; the middle part of the framework is provided with two semicircular shells, and the U-shaped primary needle is inserted into the through hole of the transformer coil to be fixed; the top of the framework is a plane and is provided with a clamping groove for fixing the pin header.

3. The precision current transformer of claim 1, wherein the inner side wall of the housing is provided with a rib for fixing the bobbin and the transformer coil.

4. The precision current transformer of claim 1, wherein the pin header is formed by two L-shaped metal pins facing away from each other and side by side.