CN215834393U

CN215834393U - Current transformer

Info

Publication number: CN215834393U
Application number: CN202121245165.7U
Authority: CN
Inventors: 王路明; 王一瑭
Original assignee: Deqing Gig Electronic Co ltd
Current assignee: Deqing Gig Electronic Co ltd
Priority date: 2021-06-04
Filing date: 2021-06-04
Publication date: 2022-02-15
Anticipated expiration: 2031-06-04

Abstract

A current transformer belongs to the technical field of current transformers. The utility model comprises an annular iron core, a coil winding arranged on the annular iron core, an annular shell arranged outside the annular iron core and the coil winding, and two output wires electrically connected to two ends of the coil winding and extending out of the annular shell, wherein at least one insulating partition plate is arranged in a middle hole of the annular shell, and the insulating partition plate uniformly divides the middle hole into at least two mutually insulated threading holes. The utility model has simple structure and convenient use, and can effectively meet more secondary load current regulation requirements.

Description

Current transformer

Technical Field

The utility model relates to the technical field of current transformers, in particular to a current transformer.

Background

The current transformer generally comprises a primary winding, a secondary winding, an iron core, a framework, a shell, a connecting terminal and the like which are insulated from each other. The working principle of the transformer is basically the same as that of a transformer, the number of turns of a primary winding is small, the primary winding is directly connected in series in a power supply circuit, and when primary load current passes through the primary winding, the generated alternating magnetic flux induces to generate secondary current which is reduced in proportion; the secondary winding has more turns and is connected with secondary loads of current coils such as instruments, relays, transmitters and the like in series to form a closed loop, and because the primary winding and the secondary winding have equal ampere turns, the load impedance in the actual operation of the current transformer is very small, and the secondary winding is close to a short-circuit state and is equivalent to a transformer in short-circuit operation.

The structure of the straight-through current transformer is not provided with a primary winding, and a load current lead penetrates through the annular iron core to play a role of the primary winding. The secondary winding is directly and uniformly wound on the circular iron core and is connected with secondary loads of current coils such as instruments, relays, transmitters and the like in series to form a closed loop, and because the straight-through current transformer is not provided with the primary winding, the transformation ratio of the straight-through current transformer is determined according to the number of turns of the primary winding penetrating through the iron core of the transformer, and the more the straight-through turns are, the smaller the transformation ratio is; conversely, the smaller the number of feed-through turns, the larger the transformation ratio.

The conventional feed-through current transformer can only adjust the size of secondary load current by changing the number of feed-through turns of a primary load current lead, on one hand, the conventional feed-through current transformer needs to be repeatedly disconnected and connected with the primary load current lead so as to adjust the number of the feed-through turns, and on the other hand, the conventional feed-through current transformer is complex and inconvenient to operate, has a limited adjusting range or gradient and cannot meet various use requirements.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems in the prior art, and provides a current transformer which is simple in structure and convenient to use and can effectively meet more secondary load current regulation requirements.

The purpose of the utility model is realized by the following technical scheme:

the utility model provides a current transformer, includes annular iron core, locates the coil winding on the annular iron core, locates annular iron core and coil winding outer annular casing, electricity and is connected to coil winding both ends and stretches out two output wires of annular casing, be equipped with an at least insulating barrier in the mesopore of annular casing, insulating barrier will mesopore evenly cut apart into two at least through wires holes of mutual insulation.

According to the utility model, the insulating partition plate is used for dividing the middle hole of the mutual inductor into a plurality of mutually insulated threading holes, so that a plurality of different primary load current wires can be threaded at the same time, and the selectivity and the convenience of selection of the primary load current are improved. Taking only one insulating partition plate as an example, the middle hole is divided into two threading holes, and a 5A primary load current lead and a 10A primary load current lead respectively penetrate through the two threading holes, so that the primary load currents of 5A and 10A can be switched rapidly by respectively communicating the loops where the two primary load current leads are located, or the loops where the two primary load current leads are located are communicated simultaneously, so that the primary load current of 15A can be obtained. Of course, if the number of the insulating spacers is larger, that is, the number of the threading holes is larger, the selectivity is higher. Therefore, the current transformer can rapidly switch different primary load currents only by operating the circuit switch, and meets various secondary load current regulation requirements.

Preferably, both ends of the insulating partition plate extend out of the middle hole of the annular shell to ensure the insulating effect.

Preferably, the length of the insulating partition plate extending out of the middle hole of the annular shell is 3mm-5mm, so that the insulating effect is ensured, and meanwhile, the obvious interference to the outside is avoided.

Preferably, at least two pairs of clamping strips are arranged on the inner wall of the middle hole of the annular shell, a clamping groove is formed between each pair of clamping strips, and the insulating partition plate is inserted into the two opposite clamping grooves. The structure can effectively guarantee the accuracy of insulating barrier mounted position on the one hand, and on the other hand also is convenient for insulating barrier's dismantlement to use as ordinary single-hole mutual-inductor.

Preferably, the middle part of each pair of opposite side surfaces of the clamping strips is provided with a positioning bulge, and the insulating partition plate is provided with a positioning groove matched with the positioning bulge. The structure effectively ensures the position accuracy of the insulating partition plate in the axial direction of the middle hole, and the bulges slide into the positioning grooves through the elasticity of the clamping strips so as to realize axial positioning.

Preferably, an introduction port inclined away from the back is formed at the end of each pair of the clamping strips, so that the convenience of the insertion operation of the insulating partition plate is improved.

Preferably, the thickness of the insulating partition plate is 1.3-1.5mm, so that the structural strength of the insulating partition plate is considered, and transitional occupation of a central hole space is avoided.

Preferably, the two output wires are respectively coated with insulating layers with different colors; the two output wires are mutually wound, and a section of transparent heat-shrinkable tube is arranged outside the two output wires. The electrodes are convenient to distinguish by different colors, the orderliness of the output wires is improved by mutual winding, and the transparent heat-shrinkable tube can fix the wound part and avoid shielding the color of the insulating layer.

The utility model has the advantages that:

1. the structure is simple, the use is convenient, and more secondary load current regulation requirements can be effectively met;

2. the splicing structure of the insulating partition plate is convenient to disassemble and assemble and accurate in positioning.

Drawings

FIG. 1 is a schematic structural view of example 1 of the present invention;

FIG. 2 is a front view of embodiment 1 of the present invention;

FIG. 3 is a schematic view of a structure of a locking strip on the inner wall of the hole in the present invention;

FIG. 4 is a front view of embodiment 2 of the present invention;

FIG. 5 is a front view of embodiment 3 of the present invention;

in the figure: 1-an annular housing; 2-output wires; 3-an insulating spacer; 41-clamping strip; 42-card slot; 43-positioning protrusions; 44-an introduction port; 5-transparent heat-shrinkable tube.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Example 1

As shown in fig. 1-3, a current transformer includes an annular iron core, a coil winding disposed on the annular iron core, an annular casing 1 disposed outside the annular iron core and the coil winding, and two output wires 2 electrically connected to two ends of the coil winding and extending out of the annular casing, wherein an insulating partition plate 3 is disposed in a central hole of the annular casing, and the insulating partition plate 3 divides the central hole into two mutually insulated threading holes.

According to the utility model, the middle hole of the mutual inductor is divided into two mutually insulated threading holes through the insulating partition plate, so that two different primary load current wires can be threaded at the same time, and the selectivity and the convenience of selection of the primary load current are improved. For example, two threading holes respectively penetrate one primary load current conducting wire of 5A and one primary load current conducting wire of 10A, and at this time, the primary load current of 5A and the primary load current of 10A can be switched rapidly by respectively communicating the loops where the two primary load current conducting wires are located, or the loops where the two primary load current conducting wires are located can be communicated at the same time, so that the primary load current of 15A can be obtained. Of course, if the number of the insulating spacers is larger, that is, the number of the threading holes is larger, the selectivity is higher, as described in

embodiments

2 and 3. Therefore, the current transformer can rapidly switch different primary load currents only by operating the circuit switch, and meets various secondary load current regulation requirements.

Specifically, both ends of the insulating partition plate 3 extend out of the central hole of the annular shell 1, so as to ensure the insulating effect. The length of the insulating partition plate 3 extending out of the hole in the annular shell is 3-5 mm, so that the insulating effect is ensured, and the obvious interference to the outside is avoided. The thickness of the insulating partition plate 3 is 1.3-1.5mm, so that the structural strength of the insulating partition plate is considered, and the transitional occupation of the space of the centering hole is avoided.

In addition, two pairs of clamping strips 41 are arranged on the inner wall of the middle hole of the annular shell 1, a clamping groove 42 is formed between each pair of clamping strips 41, and the insulating partition plate 3 is inserted into the two opposite clamping grooves 42. The structure can effectively guarantee the accuracy of insulating barrier mounted position on the one hand, and on the other hand also is convenient for insulating barrier's dismantlement to use as ordinary single-hole mutual-inductor. Meanwhile, a positioning bulge 43 is arranged in the middle of the opposite side surface of each pair of the clamping strips 41, and a positioning groove matched with the positioning bulge 43 is arranged on the insulating partition plate 3. The structure effectively ensures the position accuracy of the insulating partition plate in the axial direction of the middle hole, and the bulges slide into the positioning grooves through the elasticity of the clamping strips so as to realize axial positioning. Moreover, an introduction port 44 inclined back to the back is arranged at the end of each pair of the clamping strips 41, so that the convenience of the insertion operation of the insulating partition is improved.

Finally, two output wires 2 are respectively coated with insulating layers with different colors; the two output wires are mutually wound, and a section of transparent heat-shrinkable tube 5 is arranged outside the two output wires. The electrodes are convenient to distinguish by different colors, the orderliness of the output wires is improved by mutual winding, and the transparent heat-shrinkable tube can fix the wound part and avoid shielding the color of the insulating layer.

Example 2

As shown in fig. 4, unlike embodiment 1, the insulating spacer 3 has three pieces integrally formed at 120 ° to divide the central hole into three through holes, and three different primary load current wires can be simultaneously passed through the through holes, and the primary load current thereof can be selected by seven kinds at most.

Example 3

As shown in fig. 5, unlike

embodiments

1 and 2, the insulating spacer 3 has two pieces formed integrally and perpendicular to each other to divide the central hole into four threading holes, and four different primary load current wires can be threaded simultaneously, and at most fifteen choices of primary load current can be made.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, and any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a current transformer, includes annular iron core, locate the coil winding on the annular iron core, locate annular iron core and coil winding outer annular casing, electricity and connect to coil winding both ends and stretch out two output wires of annular casing, its characterized in that, be equipped with an at least insulating barrier in the mesopore of annular casing, insulating barrier will mesopore evenly is cut apart into two at least through wires holes of mutual insulation.

2. The current transformer of claim 1, wherein the insulating barrier extends beyond the central opening of the annular housing at both ends.

3. The current transformer according to claim 2, wherein the insulating partition extends from 3mm to 5mm from the hole in the annular housing.

4. The current transformer according to claim 1, wherein at least two pairs of locking strips are disposed on an inner wall of the central hole of the annular housing, a locking groove is formed between each pair of locking strips, and the insulating partition is inserted into two opposite locking grooves.

5. The current transformer according to claim 4, wherein each pair of said locking strips has a positioning protrusion at a middle portion of opposite sides thereof, and said insulating partition plate has a positioning groove for engaging said positioning protrusion.

6. The current transformer according to claim 4, wherein each pair of said clip strip ends has an entrance opening inclined away from each other.

7. The current transformer according to claim 1, wherein the thickness of the insulating spacer is 1.3-1.5 mm.

8. The current transformer according to claim 1, wherein the two output wires are respectively coated with insulating layers of different colors; the two output wires are mutually wound, and a section of transparent heat-shrinkable tube is arranged outside the two output wires.