CN215834346U - Three-phase current transformer with magnetic shielding and direct-current component resistance - Google Patents
Three-phase current transformer with magnetic shielding and direct-current component resistance Download PDFInfo
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- CN215834346U CN215834346U CN202121245181.6U CN202121245181U CN215834346U CN 215834346 U CN215834346 U CN 215834346U CN 202121245181 U CN202121245181 U CN 202121245181U CN 215834346 U CN215834346 U CN 215834346U
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Abstract
A miniature three-phase current transformer with magnetic shielding and direct-current component resistance belongs to the technical field of current transformers. The current transformer unit comprises a metal shell and a direct-current component resistant double-iron-core structure arranged in the metal shell; the metal shell is cylindrical, the three metal shells are sequentially hinged, and the hinged positions of the adjacent metal shells are provided with locking structures. The utility model can effectively adapt to the installation requirement in a narrow space and improve the installation convenience and efficiency.
Description
Technical Field
The utility model relates to the technical field of current transformers, in particular to a miniature three-phase current transformer with magnetic shielding and direct-current component resistance.
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.
Need use the miniature current transformer that the volume is less in the narrow and small space, for example in the ammeter, and general miniature current transformer is single-phase monomer, when using in the three-phase instrument, because its monomer structure, need install three miniature current transformer respectively, greatly increased the work load and the inconvenience of installation. If a conventional three-phase current transformer in the current market is adopted, such as a three-phase conjoined miniature current transformer with magnetic shielding and direct-current component resistance disclosed by the prior art with the application number of 200920151620.X, due to the fixed structure that three current transformer monomers are arranged in a line, the three current transformer monomers are easy to interfere with other structures in a narrow space, so that the installation difficulty is increased, and the installation efficiency is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems in the prior art, and provides a miniature three-phase current transformer with a magnetic shielding function and a direct-current component resistance function, which can effectively meet the installation requirement in a narrow space and improve the installation convenience and efficiency.
The purpose of the utility model is realized by the following technical scheme:
a miniature three-phase current transformer with magnetic shielding and direct-current component resistance comprises three current transformer units, wherein each current transformer unit comprises a metal shell and a direct-current component resistance double-iron-core structure arranged in the metal shell; the metal shell is cylindrical, three metal shells are sequentially hinged, and a locking structure is arranged at the hinged position of the adjacent metal shells.
According to the utility model, the whole appearance structure of the current transformer unit is adjusted by adjusting the holding degree of the three transformer units through the hinge structure between the adjacent current transformer units, so that the current transformer unit is more easily adapted to different narrow spaces, and the convenience and efficiency of installation are effectively improved. Meanwhile, the locking structure can ensure the structural stability after adjustment and also ensure the stability after installation.
Preferably, the hinge structure between the adjacent metal shells comprises two first sleeves arranged on the metal shell on one side at intervals, a second sleeve arranged on the metal shell on the other side and clamped between the two first sleeves, and adjusting shafts respectively inserted into the second sleeves from two ends of the two first sleeves, which are opposite to each other; and threads are arranged at one end of the adjusting shaft and on the inner side wall of the second sleeve. The hinge structure is reliable in stability and convenient to disassemble and assemble.
Preferably, the locking structure comprises a fastening head arranged at one end of the adjusting shaft far away from the threads, and a rubber ring arranged at one side of the fastening head facing the first sleeve. The locking structure realizes the fastening between the adjusting shaft and the first sleeve through the compression effect between the rubber ring on the fastening head and the end surface of the first sleeve, and the adjusting shaft is in threaded connection with the second sleeve, so that the locking of the whole hinge structure is realized, and the state after the adjustment is stably maintained. Meanwhile, when the integral structure needs to be adjusted, only the adjusting shaft needs to be loosened.
Preferably, one side of the fastening head facing the first sleeve is provided with a conical structure, one end of the first sleeve is provided with an opening matched with the conical structure, and the conical structure is provided with a rubber sleeve. The structure greatly increases the contact area of the fastening head and the first sleeve, thereby further improving the stability of the locking action.
Preferably, the fastening head has a hexagonal shape matched with the socket wrench, so that the tightness of the adjusting shaft can be adjusted by the socket wrench.
Preferably, the length of the second sleeve is greater than that of the first sleeve, so that the connection length of the adjusting shaft and the second sleeve is increased, the stability of connection is ensured, and the adjusting shaft is prevented from accidentally disengaging from the threaded connection relationship with the second sleeve when being loosened.
Preferably, the two ends of the metal shell are provided with insulating linings, and the double-iron-core structure resisting direct-current components is arranged between the insulating linings at the two ends, so that the metal shell is prevented from contacting with the iron core to influence the normal function of the metal shell.
Preferably, the double iron core structure resisting direct current component and the insulating lining are hermetically connected through epoxy resin, so that the stability and the sealing performance of connection are ensured.
The utility model has the advantages that:
1. the installation requirement in a narrow space can be effectively met, and the installation convenience and efficiency are improved;
2. the locking structure is simple, locking and releasing can be realized only by adjusting the tightness of the adjusting shaft, and the convenience of adjusting the whole structure is improved;
3. the metal shell effectively avoids the interference of an external magnetic field, and the direct-current component resisting double-iron-core structure improves the accuracy of the instrument.
Drawings
FIG. 1 is a cross-sectional view of a miniature three-phase current transformer with magnetic shielding and DC component resistance according to the present invention;
FIG. 2 is a schematic view of the structure of an adjusting shaft according to the present invention;
in the figure: 1-a metal housing; 2-a double iron core structure resisting direct current component; 31-a first sleeve; 32-a second sleeve; 33-an adjustment shaft; 331-fastening head; 3311-tapered structure; 4-insulating lining.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
A miniature three-phase current transformer with magnetic shielding and direct-current component resistance comprises three current transformer units, wherein each current transformer unit comprises a metal shell 1 and a direct-current component resistance double-iron-core structure 2 arranged in the metal shell 1; the metal shell 1 is cylindrical, three metal shell 1 is articulated in proper order, and adjacent metal shell 1 is articulated to be equipped with locking structure. The dc component resistant dual core structure 2 is a conventional structure, and therefore will not be described herein.
Specifically, the hinge structure between adjacent metal shells 1 includes two first sleeves 31 arranged on one side of the metal shell at intervals, a second sleeve 32 arranged on the other side of the metal shell and clamped between the two first sleeves 31, and adjusting shafts 33 respectively inserted into the second sleeves 32 from two opposite ends of the two first sleeves 31; and threads are arranged at one end of the adjusting shaft 33 and on the inner side wall of the second sleeve 32. The hinge structure is reliable in stability and convenient to disassemble and assemble.
The locking structure comprises a fastening head 331 arranged at one end of the adjusting shaft 33 far away from the thread, and a rubber ring arranged at one side of the fastening head 331 facing the first sleeve 31. The locking structure realizes the fastening between the adjusting shaft and the first sleeve through the compression effect between the rubber ring on the fastening head and the end surface of the first sleeve, and the adjusting shaft is in threaded connection with the second sleeve, so that the locking of the whole hinge structure is realized, and the state after the adjustment is stably maintained. Meanwhile, when the integral structure needs to be adjusted, only the adjusting shaft needs to be loosened.
Further, a tapered structure 3311 is arranged on one side of the fastening head 331 facing the first sleeve, an opening matched with the tapered structure 3311 is arranged at one end of the first sleeve 31, and a rubber sleeve is arranged on the tapered structure 3311. The structure greatly increases the contact area of the fastening head and the first sleeve, thereby further improving the stability of the locking action.
In addition, the length of the second sleeve 32 is greater than that of the first sleeve 31, so that the connection length of the adjusting shaft 33 and the second sleeve 32 is increased, the stability of connection is ensured, and the adjusting shaft is prevented from being accidentally separated from the threaded connection relation with the second sleeve when being loosened. And the fastening head 331 has a hexagonal shape to be fitted to a socket wrench so as to allow the adjustment shaft to be easily tightened or loosened by the socket wrench.
Both ends all are equipped with insulating inside lining 4 in the metal casing 1, anti direct current component double iron core structure 2 locates both ends between the insulating inside lining 4 to avoid metal casing and iron core to take place to contact and influence its normal function. And the direct-current component resistant double-iron-core structure 2 and the insulating lining 4 are hermetically connected through epoxy resin, so that the connection stability and the sealing property are ensured.
In conclusion, the whole appearance structure of the current transformer unit is adjusted by adjusting the holding degree of the three transformer units through the hinge structure between the adjacent current transformer units, so that the current transformer unit is more easily adapted to different narrow spaces, and the installation convenience and efficiency are effectively improved. Meanwhile, the locking structure can ensure the structural stability after adjustment and also ensure the stability after installation.
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 (8)
1. A miniature three-phase current transformer with magnetic shielding and direct-current component resistance comprises three current transformer units, wherein each current transformer unit comprises a metal shell and a direct-current component resistance double-iron-core structure arranged in the metal shell; the metal shell is cylindrical, the number of the metal shells is three, the metal shells are sequentially hinged, and a locking structure is arranged at the hinged position of the adjacent metal shells.
2. The miniature three-phase current transformer with the magnetic shielding function and the direct-current component resistance function according to claim 1, wherein the hinge structure between the adjacent metal shells comprises two first sleeves arranged on the metal shell on one side at intervals, a second sleeve arranged on the metal shell on the other side and clamped between the two first sleeves, and adjusting shafts respectively inserted into the second sleeves from two opposite ends of the two first sleeves; and threads are arranged at one end of the adjusting shaft and on the inner side wall of the second sleeve.
3. The miniature three-phase current transformer with magnetic shielding and direct-current component resistance as claimed in claim 2, wherein the locking structure comprises a fastening head arranged at one end of the adjusting shaft far away from the threads and a rubber ring arranged at one side of the fastening head facing the first sleeve.
4. The miniature three-phase current transformer with magnetic shielding and direct-current component resistance as claimed in claim 3, wherein a side of the fastening head facing the first sleeve is provided with a conical structure, one end of the first sleeve is provided with an opening matched with the conical structure, and the conical structure is provided with a rubber sleeve.
5. A magnetically shielded miniature three-phase current transformer against dc components as claimed in claim 3, characterized in that said fastening head has a hexagonal shape to fit a socket wrench.
6. The magnetically shielded miniature three-phase current transformer as claimed in claim 2, wherein said second sleeve has a length greater than a length of said first sleeve.
7. The miniature three-phase current transformer with magnetic shielding and direct-current component resistance as claimed in claim 1, wherein insulating linings are arranged at two ends of the metal shell, and the direct-current component resistance double-iron-core structure is arranged between the insulating linings at the two ends.
8. The miniature three-phase current transformer with magnetic shielding and direct-current component resistance as claimed in claim 7, wherein the direct-current component resistance double iron core structure and the insulating lining are hermetically connected through epoxy resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121245181.6U CN215834346U (en) | 2021-06-04 | 2021-06-04 | Three-phase current transformer with magnetic shielding and direct-current component resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121245181.6U CN215834346U (en) | 2021-06-04 | 2021-06-04 | Three-phase current transformer with magnetic shielding and direct-current component resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215834346U true CN215834346U (en) | 2022-02-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121245181.6U Active CN215834346U (en) | 2021-06-04 | 2021-06-04 | Three-phase current transformer with magnetic shielding and direct-current component resistance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215834346U (en) |
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2021
- 2021-06-04 CN CN202121245181.6U patent/CN215834346U/en active Active
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