CN221040789U - High-precision small-volume current transformer - Google Patents
High-precision small-volume current transformer Download PDFInfo
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- CN221040789U CN221040789U CN202322759285.4U CN202322759285U CN221040789U CN 221040789 U CN221040789 U CN 221040789U CN 202322759285 U CN202322759285 U CN 202322759285U CN 221040789 U CN221040789 U CN 221040789U
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 85
- 230000004308 accommodation Effects 0.000 claims description 2
- 238000010030 laminating Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 10
- 230000005674 electromagnetic induction Effects 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 206010063385 Intellectualisation Diseases 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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Abstract
The utility model relates to a high-precision small-volume current transformer which comprises a shell, an iron core arranged in the shell, a quick saturation coil arranged at one end of the iron core, and a rogowski coil arranged at the other end of the iron core, wherein the quick saturation coil comprises a coil framework arranged at one end of the iron core, a coil arranged on the coil framework, the rogowski coil comprises a circuit board arranged at the other end of the iron core, an insulating bracket which is arranged on the circuit board and takes the shape of an elliptical ring, and enameled wires which are uniformly wound on the insulating bracket and are electrically connected with the circuit board, a matched threading hole is arranged at a position, corresponding to the threading hole, of the iron core, a square hole is arranged at a position, corresponding to the threading hole, of the shell, and a jack is arranged at a position, corresponding to the threading hole. The utility model has the advantages of simple structure, stable and reliable performance, wide measurement range, high precision and small volume.
Description
Technical Field
The utility model relates to the technical field of current transformers, in particular to a high-precision small-volume current transformer.
Background
The circuit breaker is a switching device capable of closing, carrying and breaking a current under normal circuit conditions and capable of closing, carrying and breaking a current under abnormal circuit conditions for a prescribed time. The circuit breaker can be used for distributing electric energy, the asynchronous motor is not frequently started, the power supply circuit, the motor and the like are protected, and the circuit can be automatically cut off when serious overload or short circuit, undervoltage and other faults occur. Along with the higher reliability and automation requirements of a power system, the requirements of automation and intellectualization in the aspects of monitoring, control, protection and the like are provided for power transmission and distribution. At present, low-voltage circuit breakers are continuously developed towards the direction of intellectualization, miniaturization and high precision, and the accurate measurement of various electrical parameters, especially the current is more important. The traditional low-voltage circuit breaker adopts the technical scheme that an iron core current transformer is used for simultaneously carrying out current detection and self-generated power supply, and because the primary working current of the low-voltage circuit breaker is as small as a few amperes and as large as thousands of amperes, the scheme that the iron core current transformer is used for carrying out current detection has the problem that the output signal is nonlinear distorted due to heavy current saturation, and has the defects of narrow measurement range and low measurement accuracy. And the iron core current transformer is large in size and cannot meet the requirement of miniaturization of the intelligent circuit breaker.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide the small-volume current transformer with simple structure, stable and reliable performance, wide measurement range and high precision.
In order to achieve the above purpose, the utility model adopts a high-precision small-volume current transformer, which comprises a shell, an iron core arranged in the shell, a quick saturation coil arranged on one end of the iron core and a rogowski coil arranged on the other end of the iron core, wherein the quick saturation coil comprises a coil framework arranged on one end of the iron core and a coil arranged on the coil framework, the rogowski coil comprises a circuit board arranged on the other end of the iron core, an insulating support arranged on the circuit board and in an elliptical ring shape, and enameled wires uniformly wound on the insulating support and electrically connected with the circuit board, a matched threading hole is arranged at a position, corresponding to the threading hole, on the iron core, a matched square hole is arranged at a position, corresponding to the threading hole, on the shell, and a jack is arranged at a position, corresponding to the threading hole.
The structure has the beneficial effects that the Rogowski coil is arranged on the iron core, the insulating support of the Rogowski coil is made of nonmagnetic plastic, the enameled wire is wound on the insulating support to form a winding, the enameled wire is spliced on the circuit board through the wire harness, the winding provides a measuring signal, and the Rogowski coil is not easy to saturate due to the fact that the structure design without the magnetic core is adopted, can be used for measuring in a larger range, and is higher in measuring precision. And the insulating support adopts oval annular structural design, and the enameled wire is evenly wound on the insulating support, and electromagnetic induction is even, and is good in linearity, smaller in volume, and particularly suitable for the intelligent circuit breaker with very compact space, and can meet the requirement of miniaturization of the intelligent circuit breaker. Therefore, the current transformer has the advantages of simple structure, stable and reliable performance, wide measurement range, high precision and small volume.
Particularly, the iron core include the first iron core that is U type, be the second iron core of I type form, first iron core have two bellying of symmetric distribution, be formed with between two bellying and the first iron core the through wires hole, the laminating of second iron core on the open end of first iron core, coil skeleton suit on the second iron core, two bellying and second iron cores between be formed with the accommodation space that is used for placing fast saturation coil. The iron core adopts the first iron core of U type form and is the second iron core of I type form and assemble to the assembly of this iron core of being convenient for, production efficiency is higher, and the electromagnetic conversion efficiency of this structural design's iron core is higher.
In particular, the through hole of the insulating bracket is in a rectangular shape, and cambered grooves are formed at four corners of the through hole. The through hole of insulating support designs into rectangular shape, and the enameled wire can evenly twine on insulating support, and electromagnetic induction is even, and is linear good to can reach high measurement accuracy's purpose, and adopt oval annular structural design, the volume is littleer, the assembly of the conducting plate of this insulating support of being convenient for and circuit breaker.
Particularly, a limiting lug is arranged at the two ends of the coil framework corresponding to the first iron core respectively, a clamping space is formed between the limiting lug and the first iron core, and one end of the circuit board is provided with an inserting piece part inserted in the clamping space. The limiting lug of the coil framework can compress the circuit board on the first iron core, so that the circuit board is convenient to assemble with the first iron core and the coil framework, and the assembly efficiency is higher.
Particularly, the casing include the base, set up the lid on the base, lid and base between be formed with the holding chamber of placing the iron core, rogowski coil, fast saturation coil set up in the holding intracavity, base, lid on have respectively and alternate first sleeve pipe portion, the second sleeve pipe portion in through wires hole, square hole, through-hole, first sleeve pipe portion and second sleeve pipe portion insert relatively, and be formed with between first sleeve pipe portion and the second sleeve pipe portion the jack. The iron core, the rogowski coil and the fast saturation coil are arranged in the accommodating cavity between the base and the cover body, so that the iron core, the rogowski coil, the fast saturation coil and the shell are convenient to assemble, and the assembling efficiency is high.
Particularly, the two sides of the base are respectively provided with a clamping column, the cover body is provided with a clamping hole matched with the clamping columns, and the clamping columns are clamped in the clamping holes and form clamping fit between the base and the cover body. The base and the cover body are connected in a clamping fit mode, so that the base and the cover body are convenient to assemble, and the assembly efficiency is higher.
Particularly, a plug hole is formed between the base and the cover body and corresponds to the other end of the circuit board, and a plurality of pin holes are formed on the other end of the circuit board and correspond to the plug hole. Be provided with the contact pin hole on the circuit board to this circuit board adopts plug-in type connection with the mainboard of circuit breaker, and it is more convenient to assemble.
Drawings
Fig. 1 is a perspective view of an embodiment of the present utility model.
Fig. 2 is an exploded view of an embodiment of the present utility model.
Fig. 3 is a cross-sectional view of an embodiment of the present utility model.
Fig. 4 is a perspective view of an iron core according to an embodiment of the present utility model.
Detailed Description
As shown in fig. 1 to 4, the embodiment of the utility model is a high-precision small-volume current transformer, which comprises a shell 10, an iron core 40 arranged in the shell 10, a fast saturation coil 20 arranged on one end of the iron core 40, and a rogowski coil 30 arranged on the other end of the iron core 40, wherein the fast saturation coil 20 comprises a coil framework 21 arranged on one end of the iron core 40, and a coil 22 arranged on the coil framework 21, the rogowski coil 30 comprises a circuit board 31 arranged on the other end of the iron core 40, an insulating bracket 32 arranged on the circuit board 31 and in an elliptical ring shape, and enameled wires 33 uniformly wound on the insulating bracket 32 and electrically connected with the circuit board 31, wherein a matched threading hole 401 is arranged on the iron core 40 corresponding to the through hole 321 of the insulating bracket 32, a matched square hole 311 is arranged on the circuit board 31 corresponding to the threading hole 401, and a jack 101 is arranged on the shell 10 corresponding to the threading hole 401.
As shown in fig. 2 and 4, the iron core 40 includes a first U-shaped iron core 41 and a second I-shaped iron core 42, the first iron core 41 has two symmetrically distributed protrusions 411, the threading hole 401 is formed between the two protrusions 411 and the first iron core 41, the second iron core 42 is attached to the open end of the first iron core 41, the bobbin 21 is sleeved on the second iron core 41, and a containing space 402 for placing the fast saturation coil 20 is formed between the two protrusions 411 and the second iron core 41. The iron core adopts the first iron core of U type form and is the second iron core of I type form and assemble to the assembly of this iron core of being convenient for, production efficiency is higher, and the electromagnetic conversion efficiency of this structural design's iron core is higher.
As shown in fig. 1 to 3, the through hole 321 of the insulating bracket 32 has a rectangular shape, and the four corners of the through hole 321 are provided with cambered grooves 322. The through hole of insulating support designs into rectangular shape, and the enameled wire can evenly twine on insulating support, and electromagnetic induction is even, and is linear good to can reach high measurement accuracy's purpose, and adopt oval annular structural design, the volume is littleer, the assembly of the conducting plate of this insulating support of being convenient for and circuit breaker. The two ends of the coil frame 21 corresponding to the first iron cores 41 are respectively provided with a limiting bump 211, a clamping space 212 is formed between the limiting bump 211 and the first iron cores 41, and one end of the circuit board 31 is provided with an inserting piece part 312 inserted into the clamping space 212. The limiting lug of the coil framework can compress the circuit board on the first iron core, so that the circuit board is convenient to assemble with the first iron core and the coil framework, and the assembly efficiency is higher. The shell 10 comprises a base 11 and a cover body 12 arranged on the base 11, a containing cavity 100 for containing the iron core 40 is formed between the cover body 12 and the base 11, the iron core 40, the rogowski coil 30 and the fast saturation coil 20 are arranged in the containing cavity 100, the base 11 and the cover body 12 are respectively provided with a first sleeve part 111 and a second sleeve part 121 which are inserted in a threading hole 401, a square hole 311 and a through hole 321, the first sleeve part 111 and the second sleeve part 121 are inserted oppositely, and an inserting hole 101 is formed between the first sleeve part 111 and the second sleeve part 121. The iron core, the rogowski coil and the fast saturation coil are arranged in the accommodating cavity between the base and the cover body, so that the iron core, the rogowski coil, the fast saturation coil and the shell are convenient to assemble, and the assembling efficiency is high. The two sides of the base 11 are respectively provided with a clamping column 112, the cover 12 is provided with a clamping hole 122 matched with the clamping column 112, and the clamping columns 112 are clamped in the clamping holes 122 to form clamping fit between the base 11 and the cover 12. The base and the cover body are connected in a clamping fit mode, so that the base and the cover body are convenient to assemble, and the assembly efficiency is higher. A plugging hole 102 is formed between the base 11 and the cover 12 at the other end corresponding to the circuit board 31, and a plurality of pin holes 313 are formed at the other end of the circuit board 31 corresponding to the plugging hole 102. Be provided with the contact pin hole on the circuit board to this circuit board adopts plug-in type connection with the mainboard of circuit breaker, and it is more convenient to assemble.
Be provided with the rogowski coil on the iron core, the insulating support of rogowski coil adopts nonmagnetic plastics to make, and the enameled wire twines on insulating support in order to form the winding, and the enameled wire passes through the pencil grafting on the circuit board, and the winding provides measuring signal, because this rogowski coil adopts no magnetic core structural design, is difficult for saturation, can carry out the measurement of great scope, and measuring accuracy is higher. And the insulating support adopts oval annular structural design, and the enameled wire is evenly wound on the insulating support, and electromagnetic induction is even, and is good in linearity, smaller in volume, and particularly suitable for the intelligent circuit breaker with very compact space, and can meet the requirement of miniaturization of the intelligent circuit breaker. Therefore, the current transformer has the advantages of simple structure, stable and reliable performance, wide measurement range, high precision and small volume.
Claims (7)
1. A high-precision small-volume current transformer is characterized in that: including the casing, set up iron core in the casing, set up the fast saturation coil on iron core one end, set up the rogowski coil on iron core other end, fast saturation coil including set up the coil skeleton on iron core one end, set up the coil on the coil skeleton, rogowski coil including set up circuit board on iron core other end, set up on the circuit board and be oval annular insulating support, evenly wind on insulating support and with the enameled wire that the circuit board electricity is connected, the iron core on correspond insulating support's through-hole department and be provided with matched with through wires hole, the circuit board on correspond through wires hole department and be provided with matched with square hole, the casing on correspond through wires hole department and be provided with the jack.
2. The high precision small volume current transformer of claim 1, wherein: the iron core including be the first iron core of U type form, be the second iron core of I type form, first iron core have two bellying of symmetric distribution, be formed with between two bellying and the first iron core the through wires hole, the laminating of second iron core on the open end of first iron core, coil skeleton suit on the second iron core, two bellying and second iron cores between be formed with the accommodation space that is used for placing fast saturation coil.
3. The high precision small volume current transformer of claim 1 or 2, wherein: the through holes of the insulating support are rectangular in basic shape, and cambered surface grooves are formed in four corners of each through hole.
4. The high precision small volume current transformer of claim 1 or 2, wherein: the coil framework is characterized in that two ends of the coil framework are respectively provided with a limiting lug corresponding to the first iron core, a clamping space is formed between the limiting lug and the first iron core, and one end of the circuit board is provided with an inserting piece part inserted in the clamping space.
5. The high precision small volume current transformer of claim 1 or 2, wherein: the shell include the base, set up the lid on the base, lid and base between be formed with the holding chamber of placing the iron core, rogowski coil, fast saturation coil set up in the holding intracavity, base, lid on have respectively and alternate first sleeve pipe portion, the second sleeve pipe portion in through-hole, square hole, through-hole, first sleeve pipe portion and second sleeve pipe portion insert relatively, and be formed with between first sleeve pipe portion and the second sleeve pipe portion the jack.
6. The high precision small volume current transformer of claim 5, wherein: the base both sides on be provided with the joint post respectively, the lid on be provided with joint post matched with joint hole, the joint post block in the joint hole, and constitute the joint cooperation of base and lid.
7. The high precision small volume current transformer of claim 5, wherein: and a plurality of pin holes are formed between the base and the cover body and correspond to the other end of the circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322759285.4U CN221040789U (en) | 2023-10-14 | 2023-10-14 | High-precision small-volume current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322759285.4U CN221040789U (en) | 2023-10-14 | 2023-10-14 | High-precision small-volume current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221040789U true CN221040789U (en) | 2024-05-28 |
Family
ID=91173242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322759285.4U Active CN221040789U (en) | 2023-10-14 | 2023-10-14 | High-precision small-volume current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221040789U (en) |
-
2023
- 2023-10-14 CN CN202322759285.4U patent/CN221040789U/en active Active
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