CN113782326A

CN113782326A - Bipolar current transformer

Info

Publication number: CN113782326A
Application number: CN202111186206.4A
Authority: CN
Inventors: 蔡明星
Original assignee: Foshan Ming Fu Xing Metal Materials Co ltd
Current assignee: Foshan Ming Fu Xing Metal Materials Co ltd
Priority date: 2021-10-12
Filing date: 2021-10-12
Publication date: 2021-12-10
Also published as: ZA202110077B

Abstract

A bipolar current transformer includes a casing, an air-core coil, a solid coil, a sponge, a top cover, a first wire and a second wire; the casing is provided with a first through hole, and the air-core coil, the solid coil and the sponge are all arranged in the In the casing, the sponge is located between the hollow coil and the solid coil, and the solid coil is located above the hollow coil; the first wire is connected to the hollow coil, and the second wire is connected to the solid coil; Two through holes. The present invention proposes a bipolar current transformer based on the above content, which solves the problems that the current transformer in the prior art can only monitor large currents or monitor small arcs, and has low monitoring quality and poor versatility.

Description

Bipolar current transformer

Technical Field

The invention relates to the technical field of current transformers, in particular to a bipolar current transformer.

Background

The transformer is a general name of a current transformer and a voltage transformer, can change high voltage into low voltage and change large current into small current, and is used for measuring or protecting a system. The theoretical basis of current transformers is electromagnetic induction, which generally consists of a closed core and windings. However, the current transformer in the prior art can only monitor large current or small electric arc, has low monitoring quality and poor universality, and cannot meet the requirements of people.

Disclosure of Invention

The invention aims to provide a bipolar current transformer, which solves the problems that the current transformer in the prior art can only monitor large current or small electric arc, and has low monitoring quality and poor universality.

In order to achieve the purpose, the invention adopts the following technical scheme:

a bipolar current transformer comprises a shell, an air-core coil, a solid coil, a sponge, a top cover, a first lead and a second lead;

the shell is provided with a first through hole, the hollow coil, the solid coil and the sponge are all arranged in the shell, the sponge is positioned between the hollow coil and the solid coil, and the solid coil is positioned above the hollow coil; the first lead is connected to the air coil, and the second lead is connected to the solid coil; the top cover covers the shell, and a second through hole penetrates through the top cover.

Further, the shell comprises a bottom shell and a limiting boss, the limiting boss is arranged on the bottom surface inside the bottom shell, the first through hole penetrates through the limiting boss, and mounting grooves are formed in the outer side of the limiting boss and the inner side of the bottom shell;

the hollow coil, the sponge with the solid coil install respectively in the mounting groove, the bottom of hollow coil laminate in the inside bottom surface of drain pan, the top surface laminate of hollow coil in the bottom of sponge, the top laminate of sponge in the bottom of solid coil.

Preferably, a clamping groove is formed in the top of the bottom shell in a recessed mode, the top cover is mounted in the clamping groove, and the outer side of the top of the limiting boss is attached to the inner wall of the second through hole.

Specifically, the housing further comprises a lead block, the lead block protrudes out of the outer side of the bottom shell, and a lead hole is formed in the lead block.

In some embodiments, the number of the lead blocks is two, and the two lead blocks are oppositely arranged on two sides of the bottom case.

In some embodiments, the number of the lead blocks is two, and two lead blocks are adjacently arranged.

Further, the top cover is provided with a dismounting groove.

Specifically, the air-core coil comprises a hollow tetrafluoro plastic ring and a copper wire wound on the tetrafluoro plastic ring.

Preferably, the solid coil comprises a solid sendust magnetic core ring and a copper wire wound around the sendust magnetic core ring.

Compared with the prior art, one of the technical schemes has the following beneficial effects:

through hollow coil and solid core coil, can monitor the heavy current, can monitor little electric arc again to it separates to be equipped with the sponge, makes two coils independent work, each other does not influence, reaches the improvement bipolar current transformer commonality and monitoring quality's effect.

Drawings

FIG. 1 is a schematic structural diagram of one embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a cross-sectional view of a bottom case of one embodiment of the present invention;

FIG. 3 is a schematic diagram of a cross-sectional view of a bipolar current transformer in accordance with one embodiment of the present invention;

FIG. 4 is a schematic diagram of a lead block according to one embodiment of the present invention;

FIG. 5 is a schematic structural view of a top cover of one embodiment of the present invention;

wherein: the coil assembly comprises a shell 1, a bottom shell 11, a clamping groove 111, a limiting boss 12, a first through hole 121, a mounting groove 13, a lead block 14, a lead hole 141, an air core coil 2, a solid coil 3, a sponge 4, a top cover 5, a second through hole 51, a dismounting groove 52, a first lead 6, a second lead 7 and a wiring terminal 8.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features for distinguishing between descriptive features, non-sequential, non-trivial and non-trivial. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In one embodiment of the present invention, as shown in fig. 1 to 5, a bipolar current transformer includes a case 1, an air coil 2, a solid coil 3, a sponge 4, a top cover 5, a first lead 6 and a second lead 7; the shell 1 is provided with a first through hole 121, the hollow coil 2, the solid coil 3 and the sponge 4 are all arranged in the shell 1, the sponge 4 is positioned between the hollow coil 2 and the solid coil 3, and the solid coil 3 is positioned above the hollow coil 2; the first lead is connected to the air coil 2, and the second lead is connected to the solid coil 3; the top cover 5 covers the housing 1, and a second through hole 51 penetrates through the top cover 5. In this embodiment, the bipolar current transformer is applied to fire-fighting monitoring detection products and small circuit breakers, for example, when the bipolar current transformer is used in cooperation with fire-fighting monitoring detection products and small circuit breakers, when the bipolar current transformer detects that current is too large or too small, the bipolar current transformer trips, and the first lead 6 and the second lead 7 are electrically connected to the same connecting terminal 8 respectively, so that the bipolar current transformer is convenient for customers to install; during operation, specifically, a line to be detected passes through the first through hole 121 and the second through hole 51, because the inside of the air-core coil 2 is hollow, and no magnetic core is arranged inside the air-core coil 2, the current passing through the air-core coil 2 is not limited by the magnetic core, that is, the air-core coil 2 can pass through a relatively large current without saturation, so that the air-core coil 2 can monitor a current with a relatively large current; the solid coil 3 is internally provided with the magnetic core, so that the solid coil 3 can monitor weak electric arcs and improve the safety performance of a circuit; and solid coil 3 with hollow coil 2 passes through sponge 4 separates, makes solid coil 3 with can not electrically conduct between the hollow coil 2 to make solid coil 3 with can not produce the interference between the hollow coil 2, make solid coil 3 with hollow coil 2 independent work, the bipolar current transformer of this embodiment can monitor the heavy current, can monitor little electric arc again to two coils independent work, each other do not influence, reach the improvement bipolar current transformer commonality and monitoring quality's effect.

As shown in fig. 3, the housing 1 includes a bottom shell 11 and a limiting boss 12, the limiting boss 12 is disposed on a bottom surface inside the bottom shell 11, the limiting boss 12 penetrates through the first through hole 121, and mounting grooves 13 are formed on an outer side of the limiting boss 12 and an inner side of the bottom shell 11; hollow coil 2 sponge 4 with solid coil 3 install respectively in mounting groove 13, the bottom of hollow coil 2 laminate in the inside bottom surface of drain pan 1, the top surface of hollow coil 2 laminate in the bottom of sponge 4, the top of sponge 4 laminate in the bottom of solid coil 3. In this embodiment, hollow coil 2 sponge 4 with solid coil 3 respectively spacing install in mounting groove 13 makes hollow coil 2 sponge 4 with solid coil 3 can't the off normal by a wide margin, avoids hollow coil 2 sponge 4 with solid coil 3 influences the monitoring result because of the off normal by a wide margin in the testing process to guarantee the accuracy of testing result, reach the improvement bipolar current transformer detection quality's effect.

As shown in fig. 2, a clamping groove 111 is recessed in the top of the bottom case 11, the top cover 5 is mounted in the clamping groove 111, and the outer side of the top of the limiting boss 12 is attached to the inner wall of the second through hole 51. In this embodiment, when the top cover 5 is installed, specifically, the top cover 5 is installed in the clamping groove 111, so that the outer side of the top cover 5 is attached to the inner wall of the clamping groove 111, the bottom surface of the top cover 5 is attached to the bottom surface of the clamping groove 111, and the outer side of the top of the limiting boss 12 is attached to the inner wall of the second through hole 51, so that the top cover 5 is firmly installed, the sealing performance is good, and the effect of improving the installation stability of the top cover 5 is achieved.

As shown in fig. 1, the housing 1 further includes a lead block 14, the lead block 14 protrudes out of the bottom case 1, and the lead block 14 is provided with a lead hole 141. In this embodiment, the number of the lead blocks 14 is two, each lead block 14 is provided with two lead holes 141, the first lead 6 and the second lead 7 are respectively connected to the hollow coil 2 and the solid coil 3 through the lead holes 141 of the two lead blocks 14, so that the first lead 6 and the second lead 7 can be conveniently led out to the outer side of the bottom case 11, and after a product is molded, only a small amount of epoxy resin needs to be coated to fix the first lead 6 and the second lead 7, unlike a conventional inductor, a large amount of epoxy resin is poured, so as to reduce interference when an arc is detected. The number of the lead blocks 14 is two, and the two lead blocks 14 are oppositely arranged on two sides of the bottom shell 1. The two lead blocks 14 are respectively arranged at two ends of the bottom shell 1, so that the phenomena of wrong connection and the like caused by the fact that the first lead 6 is connected with the second lead 7 too close to each other can be avoided.

As shown in fig. 4, the number of the lead blocks 14 is two, and two lead blocks 14 are adjacently disposed. In this embodiment, the two lead blocks 14 are arranged adjacently, so that the first lead 6 and the second lead 7 can be conveniently arranged and distributed in a unified manner, a customer can conveniently connect the first lead 6 and the second lead 7 to the same connecting terminal 8 in a unified manner, and the plugging efficiency of the leads can be improved; the first conducting wire 6 and the second conducting wire 7 are distinguished by different colors, for example, the first conducting wire 6 is black, and the second conducting wire 7 is red, so that the phenomenon of wrong wire connection is prevented.

As shown in fig. 5, the top cover 5 is provided with a removal groove 52. In this embodiment, when the top cover 5 needs to be disassembled, a tool can be inserted into the disassembling groove 52, and then the top cover 5 is tilted, so that the quick disassembling is realized, and the effect of improving the disassembling efficiency of the top cover 5 is achieved.

The hollow coil 2 comprises 6 hollow tetrafluoro plastic rings and copper wires wound on the tetrafluoro plastic rings. In this embodiment, the tetrafluoro plastic ring is resistant to high temperature and is not easily deformed, thereby achieving the effect of prolonging the service life of the air-core coil 2.

The solid coil 3 comprises a solid iron-silicon-aluminum magnetic core ring and a copper wire wound on the iron-silicon-aluminum magnetic core ring. In the embodiment, the sendust magnetic core ring has the following characteristics that the full magnetic flux density of sendust cannot be reduced under the high-temperature condition; the sendust has soft and full characteristics, the bearable current value is higher, and if the current value exceeds the safe current value, the monitoring quality effect of the solid coil 3 can be improved.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A bipolar current transformer, characterized in that: comprising a casing, an air-core coil, a solid coil, a sponge, a top cover, a first wire and a second wire;

The casing is provided with a first through hole, the hollow coil, the solid coil and the sponge are all arranged in the casing, the sponge is located between the hollow coil and the solid coil, and the solid coil is located above the hollow coil; The first wire is connected to the hollow coil, and the second wire is connected to the solid coil; the top cover is covered with the casing, and the top cover is provided with a second through hole.

2 . The bipolar current transformer according to claim 1 , wherein the housing comprises a bottom shell and a limit boss, and the limit boss is arranged on the bottom surface inside the bottom shell, 2 . The first through hole is penetrated by the limiting boss, and a mounting groove is formed on the outer side of the limiting boss and the inner side of the bottom case;

The air-core coil, the sponge and the solid coil are respectively installed in the installation slots, the bottom of the air-core coil is attached to the bottom surface inside the bottom case, and the top surface of the air-core coil is attached to the The bottom of the sponge, the top of the sponge is attached to the bottom of the solid coil.

3 . The bipolar current transformer according to claim 2 , wherein the top of the bottom case is recessed with a clamping groove, the top cover is installed in the clamping groove, and the limiting convex The outer side of the top of the stage is attached to the inner wall of the second through hole.

4 . The bipolar current transformer according to claim 2 , wherein the casing further comprises a lead block, the lead block protrudes from the outer side of the bottom case, and the lead block is provided with a lead wire. 5 . hole.

5 . The bipolar current transformer according to claim 4 , wherein the number of the wire blocks is two, and the two wire blocks are oppositely arranged on both sides of the bottom case. 6 .

6 . The bipolar current transformer according to claim 4 , wherein the number of the wire blocks is two, and the two wire blocks are arranged adjacent to each other. 7 .

7 . The bipolar current transformer according to claim 1 , wherein the top cover is provided with a dismounting slot. 8 .

8 . The bipolar current transformer according to claim 1 , wherein the hollow coil comprises a hollow tetrafluoroplastic ring and a copper wire wound around the tetrafluoroplastic ring. 9 .

9 . The bipolar current transformer according to claim 1 , wherein the solid coil comprises a solid FeSiAl magnetic core ring and a copper wire wound around the FeSiAl magnetic core ring. 10 .