Miniature current transformer

Abstract

The utility model discloses a miniature current transformer in the field of transformers, which comprises a shell and an annular iron core, the iron core is mounted in the shell, a cross rod penetrating through the middle of the iron core is mounted in the shell, the iron core is suspended in the shell, a primary coil and a secondary coil are respectively wound on the iron core, and the primary coil and the secondary coil are wound on the shell. The primary coil and the secondary coil are distributed at the two ends of the iron core, one end, close to the primary coil, of the shell is provided with a primary wiring terminal used for being connected with the primary coil to conduct electricity, and one end, close to the secondary coil, of the shell is provided with a secondary wiring terminal used for being connected with the secondary coil to conduct electricity. The primary wiring terminal and the secondary wiring terminal are respectively provided with a wire hole used for being connected with a wire and a welding groove used for being welded with the wire. The iron core and the coil are all mounted in the shell, so that the transformer forms a more miniature structure, the cost is reduced, the wiring terminal of the transformer forms a detachable and non-detachable structure through two different connection modes of the wire hole and the welding groove, and flexible use by a user is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to a mutual -inductor technical field, specifically is a micro current transformer. BACKGROUND

[0002] The current transformer is a kind of special transformer, it is the instrument that the primary side large current is converted into secondary side small current to measure according to electromagnetic induction principle, in power generation, power transformation, power transmission, distribution and the line of electricity plays the role of current transformation and electrical isolation, is widely used in the measurement, protection and control of power system.

[0003] However, the position of the current transformer internal core and the position of the wiring terminal are far apart, so that the internal coil needs to be pulled for a long distance after winding, causing the shell of the mutual inductor to be large, and the internal space is wasted, in addition, when the wiring terminal of the current transformer is connected with the wire, the connection mode is single, and basically only the wire hole opened in the wiring terminal can be connected, after long-term use, the wire is easy to fall off, causing internal power failure. UTILITY MODEL CONTENTS

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a micro current transformer, which can effectively solve the technical problems of large size of current transformer and single connection mode with wire.

[0005] The utility model solves the technical problems by adopting the technical scheme that

[0006] A micro current transformer, comprising a shell and a circular ring-shaped core, the core is installed in the interior of the shell, a cross bar is installed in the shell and passes through the middle part of the core, so that the core is suspended in the interior of the shell, the core is wound with a primary coil and a secondary coil respectively, and the primary coil and the secondary coil are distributed at both ends of the core, a primary wiring terminal for connecting and conducting electricity with the primary coil is installed at one end of the shell close to the primary coil, a secondary wiring terminal for connecting and conducting electricity with the secondary coil is installed at one end of the shell close to the secondary coil, the primary wiring terminal and the secondary wiring terminal are both provided with a wire hole for connecting the wire and a welding groove for welding with the wire.

[0007] Further, the inner wall of the shell is provided with two protrusions for connecting with the protrusions at both ends of the cross bar, and the protrusions are provided with a slot for inserting the cross bar at one end close to the cross bar.

[0008] Further, the protrusions are close to the outer side of the core at one end close to the cross bar, so that the core is suspended in the interior of the shell.

[0009] Further, the primary coil is wound on the upper part of the core, the secondary coil is wound on the lower part of the core, and the number of turns of the primary coil is greater than that of the secondary coil.

[0010] Further, the welding groove is V-shaped, and one end of the welding groove is in communication with the side of the primary / secondary terminal.

[0011] Further, the bottom of the shell is provided with a mounting plate for fixing position, the mounting plate is provided with mounting holes with fixed two ends, and the bottom of the mounting plate is provided with a glue layer.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] The utility model discloses a shell, iron core, primary coil, secondary coil, primary terminal and secondary terminal, and the iron core and the coil are all installed in the shell, and the transformer forms a more miniature structure, and the cost is reduced, and simultaneously, when the transformer is connected with the wire, the wiring terminal forms the structure of detachable and unremovable through the two different connection modes of the wire hole and the welding groove, and the user is convenient and flexible to use. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 It is whole structure schematic diagram for the utility model embodiment;

[0015] Fig. 2 It is the structure schematic diagram of installing the iron core in the shell for the utility model embodiment;

[0016] Fig. 3 It is the structure schematic diagram of the shell for the utility model embodiment;

[0017] Mark in drawing:

[0018] 1-shell, 2-iron core, 3-cross bar, 4-primary coil, 5-secondary coil, 6-primary terminal, 7-secondary terminal, 8-wire hole, 9-welding groove, 10-protruding portion, 11-slot, 12-mounting plate, 13-mounting hole, 14-glue layer. DETAILED DESCRIPTION

[0019] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings of the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor belong to the scope of protection of the utility model.

[0020] As Figs. 1-3The utility model provides a micro current transformer mainly for electrical equipment based on electromagnetic induction principle, which converts high current into low current in proportion, and its structure mainly comprises a shell 1, an iron core 2 installed inside the shell 1, and a primary coil 4 and a secondary coil 5 wound on the iron core 2, and high voltage current is connected from one end of the primary coil 4, and low voltage current is output from one end of the secondary coil 5 through electromagnetic induction principle.

[0021] The iron core 2 is installed inside the shell 1, a crossbar 3 is installed in the shell 1 to pass through the middle part of the iron core 2, so that the iron core 2 is suspended inside the shell 1, the primary coil 4 and the secondary coil 5 are wound on the iron core 2 respectively, and the crossbar 3 makes the iron core 2 suspended in the shell 1, avoiding the primary coil 4 and the secondary coil 5 wound from touching the inner wall of the shell 1, so that the primary coil 4 and the secondary coil 5 can better perform electromagnetic induction.

[0022] Inside the shell 1, two protrusions are arranged on the inner wall of the shell 1 to connect with the protrusion parts 10 at both ends of the crossbar 3, and a slot 11 is arranged on one end of the protrusion part 10 close to the crossbar 3 for inserting the crossbar 3, after the crossbar 3 passes through the inside of the iron core 2, the inside of the iron core 2 is not a fully closed structure, and there is still space provided for the primary coil 4 and the secondary coil 5 to be wound on the inside of the iron core 2. When the iron core 2 is fixed through the crossbar 3, the protrusion parts 10 at both ends close to the crossbar 3 are simultaneously attached to the outside of the iron core 2, which can prevent the iron core 2 from moving and ensure that the iron core 2 is suspended and installed in the shell 1.

[0023] When the primary coil 4 and the secondary coil 5 are wound on the iron core 2, the primary coil 4 and the secondary coil 5 are distributed and wound at both ends of the iron core 2, wherein the primary coil 4 is wound on the upper part of the iron core 2, and the secondary coil 5 is wound on the lower part of the iron core 2, and in order to form the effect of converting high current into low current through electromagnetic induction, the number of turns of the primary coil 4 is greater than the number of turns of the secondary coil 5.

[0024] In order to better connect electricity, two primary wiring terminals 6 for connecting conductive primary coils 4 at both ends are installed on the end of the shell 1 close to the primary coil 4, two secondary wiring terminals 7 for connecting conductive secondary coils 5 at both ends are installed on the end of the shell 1 close to the secondary coil 5, and in the structure of the primary wiring terminal 6 and the secondary wiring terminal 7, different ways are adopted to connect with the external wire, on the one hand, the wire hole 8 for connecting the wire is provided on the primary wiring terminal 6 and the secondary wiring terminal 7, the wire can be connected by screwing through the wire hole 8, this way is detachable, convenient for replacing the wire later, on the other hand, the welding groove 9 for welding with the wire is provided on the primary wiring terminal 6 and the secondary wiring terminal 7, the wire can be directly welded and fixed by being placed on the welding groove 9, this way is not detachable. Among them, in order to facilitate the position fixing of the wire during welding, and the wire does not move during welding, the welding groove 9 adopts a V-shaped structure, and one end of the welding groove 9 is in conductive with the side of the primary wiring terminal 6 / secondary wiring terminal 7, which facilitates balanced placement of the wire.

[0025] In addition, in order to facilitate the fixing of the position of the mutual inductor, an installation plate 12 for fixing the position is installed at the bottom of the shell 1, the installation plate 12 is provided with two fixed installation holes 13, and the bottom of the installation plate 12 is also provided with a glue layer 14, so that the user can choose different ways to install and fix the mutual inductor.

[0026] Compared with the prior art, the technical scheme installs the iron core 2 and the coil 4 in the shell 1, so that the mutual inductor has a more miniature structure and reduces the cost, and when the mutual inductor is connected with the wire, the wiring terminal has two different connection modes of the wire hole 8 and the welding groove 9, forming a detachable and non-detachable structure, which is convenient for the user to use flexibly.

[0027] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application, any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A miniature current transformer comprising a housing and a toroidal core mounted inside the housing, characterized by: The shell is internally provided with a crossbar passing through the middle of the iron core, so that the iron core is suspended in the shell, the iron core is respectively wound with a primary coil and a secondary coil, the primary coil and the secondary coil are distributed at two ends of the iron core, the shell is provided with a primary terminal near one end of the primary coil, the primary terminal is used for electrically connecting with the primary coil, the shell is provided with a secondary terminal near one end of the secondary coil, the secondary terminal is used for electrically connecting with the secondary coil, the primary terminal and the secondary terminal are respectively provided with a wire hole used for connecting a wire and a welding groove used for welding the wire.

2. A micro current transformer according to claim 1, characterized in that: The inner wall of the shell is provided with two protrusions used for connecting with the two ends of the crossbar, the protrusions are provided with an insertion slot used for inserting the crossbar near one end of the crossbar.

3. A micro current transformer according to claim 2, characterized in that: The protrusions are close to the outer side of the iron core near one end of the crossbar, so that the iron core is suspended in the shell.

4. A micro current transformer according to claim 1, characterized in that: The primary coil is wound on the upper part of the iron core, the secondary coil is wound on the lower part of the iron core, and the number of turns of the primary coil is greater than that of the secondary coil.

5. A micro current transformer according to claim 1, characterized in that: The welding groove is V-shaped, and one end of the welding groove is in conductive connection with the side of the primary terminal / secondary terminal.

6. A micro current transformer according to any one of claims 1 to 5, characterized in that: The bottom of the shell is provided with a mounting plate used for fixing the position, the mounting plate is provided with two mounting holes fixed at two ends, and the bottom of the mounting plate is provided with a glue layer.

Images