CN210692317U

CN210692317U - Socket type measuring protection current transformer

Info

Publication number: CN210692317U
Application number: CN201921866344.5U
Authority: CN
Inventors: 张丽丽; 刘春生
Original assignee: Nanjing Gwdr Power Technology Co ltd
Current assignee: Nanjing Gwdr Power Technology Co ltd
Priority date: 2019-11-01
Filing date: 2019-11-01
Publication date: 2020-06-05
Anticipated expiration: 2029-11-01

Abstract

The utility model provides a protection current transformer is measured to socket formula, include: the winding comprises a shell, a component with an insulating iron core and a secondary winding, a primary winding and a spring socket, wherein the component with the insulating iron core and the secondary winding, the primary winding and the spring socket are arranged in the shell, the primary winding penetrates through holes in the component with the insulating iron core and the secondary winding, and two ends of the primary winding are connected with the spring socket. The utility model provides a take spring socket's current transformer, simple structure and compactness avoid the loaded down with trivial details threading work when using the mutual-inductor, practice thrift man-hour, save space, can also be suitable increase mutual-inductor rated current value simultaneously, and the application scenario is extensive.

Description

Socket type measuring protection current transformer

Technical Field

The utility model belongs to the technical field of electric power automation, a protection current transformer is measured to socket formula is related to.

Background

The current transformer consists of a closed iron core and a winding and works according to the electromagnetic induction principle. The winding (the number of turns is N1) of the current transformer connected with the current to be measured is called a primary winding (or a primary winding and a primary winding); the winding (N2 turns) that receives the measurement is called the secondary winding (or secondary winding, secondary winding). The current transformer has the function of converting primary current with a larger value into secondary current with a smaller value through a certain transformation ratio for protection, measurement and other purposes. Such as a current transformer with a transformation ratio of 400/5, can convert the current of 400A into 5A.

At present, a plurality of measuring and protecting current transformers are needed for current sampling applied to various functional instruments of electric power automation. The current transformers have different shapes, and the connection mode of a primary winding and a measured circuit lead is roughly divided into 2 types, wherein some primary windings (leads) directly penetrate through an iron core to be connected with the leads of a measured current loop, and the threading is troublesome in the mode; some primary windings and secondary windings are respectively led out of wiring pins and packaged together, and although the mode is convenient for the installation and fixation of the current transformer and does not need threading, the insulation and voltage resistance and the current application range are limited, and a circuit board needs to be thickened and coated with copper during application. Therefore, the existing current transformer structures have defects.

Disclosure of Invention

In order to solve the problem, the utility model discloses a protection current transformer is measured to socket formula, wherein the threading part of primary winding links together with spring socket, not only can save the vexation of threading, can also be appropriate increase mutual-inductor rated current value.

In order to achieve the above purpose, the utility model provides a following technical scheme:

a socket type measurement protection current transformer comprises a shell, an assembly with an insulating iron core and a secondary winding, a primary winding and a spring socket, wherein the assembly with the insulating iron core and the secondary winding, the primary winding and the spring socket are arranged in the shell; the assembly with the insulated iron core and the secondary winding comprises an insulated shell, an iron core and a secondary winding wound on the iron core, wherein the secondary winding is connected with a secondary winding lead-out pin exposed out of the surface of the shell; the iron core is cylindrical, the insulating shell comprises an upper shell and a lower shell which are respectively fixed at two ends of the iron core, the lower shell comprises an annular end part and a connecting shaft connected with the end part, a through hole for the primary winding to pass through is formed in the connecting shaft, and the connecting shaft is connected with the annular lower shell after penetrating through the through hole in the formed iron core; the spring socket comprises a spring moving sheet and a spring fixed sheet which can be connected in a welding mode, one end of the spring socket is connected with the primary winding, and the other end of the spring socket is exposed out of the surface of the shell.

Furthermore, a hollow pin is fixed on the surface of the shell.

Furthermore, the outer diameter of the connecting shaft is matched with the inner diameter of the through hole of the iron core.

Compared with the prior art, the utility model has the advantages of as follows and beneficial effect:

the utility model provides a take spring socket's current transformer, simple structure and compactness avoid the loaded down with trivial details threading work when using the mutual-inductor, practice thrift man-hour, save space, can also be suitable increase mutual-inductor rated current value simultaneously, and the application scenario is extensive.

Drawings

Fig. 1 is a schematic view of the overall structure of the socket type measurement protection current transformer provided by the present invention, wherein (a) is a front view, (b) is a left side view of (a), and (c) is a bottom view of (a).

Fig. 2 is a schematic structural diagram of the inside of a socket type measurement protection current transformer shell.

Fig. 3 is another angular view of fig. 2.

Fig. 4 is a schematic structural diagram of an assembly with an insulated iron core and a secondary winding.

Fig. 5 is a schematic view of a spring socket structure.

Description of reference numerals:

1-assembly with an insulating iron core and a secondary winding, 101-iron core, 102-secondary winding, 103-upper shell, 104-lower shell, 2-primary winding, 3-spring socket, 301-spring moving plate, 302-spring fixed plate, 4-shell, 5-hollow pin and 6-secondary winding leading-out pin.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings and embodiments, which are to be understood as illustrative only and not limiting the scope of the invention.

A socket type measurement protection current transformer is shown in figures 1, 2 and 3 and comprises a shell 4, an assembly 1 with an insulating iron core and a secondary winding, a primary winding 2 and a spring socket 3, wherein the assembly 1, the primary winding 2 and the secondary winding are arranged in the shell 4. The middle part of the primary winding 2 passes through the assembly 1 with the insulating iron core and the secondary winding, and the two ends of the primary winding are connected with the spring socket 3.

Specifically, as shown in fig. 4, the assembly 1 with an insulated iron core and a secondary winding includes an insulated housing, an iron core 101 and a secondary winding 102 wound around the iron core 101, the iron core is cylindrical, a through hole is formed in the center of the iron core, the secondary winding 102 has a plurality of turns and is wound around the periphery of the iron core 101, the insulated housing includes an upper housing 103 and a lower housing 104 fixed at two ends of the iron core, respectively, wherein the lower housing 104 includes a circular end portion and a connecting shaft connected to the end portion, the connecting shaft is cylindrical and has a through hole therein, the outer diameter of the through hole is adapted to the inner diameter of the through hole of the iron core, the connecting shaft is assembled with the circular upper housing 103 after penetrating through the through hole in the molded iron core, and the requirement. Therefore, a threading hole for the primary winding to pass through is formed in the assembly 1 with the insulating iron core and the secondary winding.

As shown in fig. 5, the spring socket 3 includes a spring moving piece 301 and a spring fixed piece 302, and the spring moving piece 301 and the spring fixed piece 302 are made of beryllium bronze and are formed by stamping, so as to ensure both elasticity and conductivity. The spring moving plate 301 and the spring fixed plate 302 are welded at the position b. The opposite surfaces of the spring moving plate 301 and the spring fixed plate 302 are provided with small bulges, so that the elasticity and the friction force of the spring moving plate and the spring fixed plate can be increased.

The primary winding 2 is in a wire form, and after the primary winding passes through the threading hole, two ends of the primary winding are firmly welded with the position a of the spring socket. After the assembly with the insulating iron core and the secondary winding assembly 1, the primary winding 2 and the spring socket 3 are connected as shown in fig. 2, the assembly is assembled into a shell formed by a mold, a limiting structure is preset in the shell according to the structure and the size of parts in the shell to play a role in fixing, and an opening for exposing the spring socket is formed in the shell. And the secondary winding copper wire is welded with a lead-out copper needle which is fixed on the shell and is firm after glue pouring to form two secondary winding lead-out pins 6. The spring socket is assembled to the reserved opening of the shell, glued and sealed. And (5) after glue pouring, packaging and curing are carried out inside the shell, and assembling is finished. The shell is also provided with a hollow foot 5 for fixing.

The technical means disclosed by the scheme of the present invention is not limited to the technical means disclosed by the above embodiments, but also includes the technical scheme formed by the arbitrary combination of the above technical features. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also considered as the protection scope of the present invention.

Claims

1. A socket type measurement protection current transformer is characterized in that: the transformer comprises a shell, an assembly with an insulating iron core and a secondary winding, a primary winding and a spring socket, wherein the assembly with the insulating iron core and the secondary winding, the primary winding and the spring socket are arranged in the shell; the assembly with the insulated iron core and the secondary winding comprises an insulated shell, an iron core and a secondary winding wound on the iron core, wherein the secondary winding is connected with a secondary winding lead-out pin exposed out of the surface of the shell; the iron core is cylindrical, the insulating shell comprises an upper shell and a lower shell which are respectively fixed at two ends of the iron core, the lower shell comprises an annular end part and a connecting shaft connected with the end part, a through hole for the primary winding to pass through is formed in the connecting shaft, and the connecting shaft is connected with the annular lower shell after penetrating through the through hole in the formed iron core; the spring socket comprises a spring moving sheet and a spring fixed sheet which can be connected in a welding mode, one end of the spring socket is connected with the primary winding, and the other end of the spring socket is exposed out of the surface of the shell.

2. The socket-type measurement protection current transformer according to claim 1, wherein: and a hollow pin is also fixed on the surface of the shell.

3. The socket-type measurement protection current transformer according to claim 1, wherein: the outer diameter of the connecting shaft is matched with the inner diameter of the through hole of the iron core.