CN117912806A - Current transformer based on permanent magnet and soft magnetic material - Google Patents
Current transformer based on permanent magnet and soft magnetic material Download PDFInfo
- Publication number
- CN117912806A CN117912806A CN202410228871.2A CN202410228871A CN117912806A CN 117912806 A CN117912806 A CN 117912806A CN 202410228871 A CN202410228871 A CN 202410228871A CN 117912806 A CN117912806 A CN 117912806A
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- Prior art keywords
- magnetic circuit
- iron core
- annular iron
- soft magnetic
- circuit part
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- 239000000696 magnetic material Substances 0.000 title claims abstract description 30
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 51
- 238000004804 winding Methods 0.000 claims abstract description 41
- 230000001052 transient effect Effects 0.000 claims abstract description 12
- 229910001004 magnetic alloy Inorganic materials 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 3
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 claims description 3
- WBWJXRJARNTNBL-UHFFFAOYSA-N [Fe].[Cr].[Co] Chemical compound [Fe].[Cr].[Co] WBWJXRJARNTNBL-UHFFFAOYSA-N 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 229910000828 alnico Inorganic materials 0.000 claims description 3
- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical compound [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 claims description 3
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 claims description 3
- -1 iron-silicon-aluminum Chemical compound 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 229910001172 neodymium magnet Inorganic materials 0.000 claims description 3
- 229910000889 permalloy Inorganic materials 0.000 claims description 3
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 3
- 238000004422 calculation algorithm Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000004075 alteration Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000013528 artificial neural network Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000007637 random forest analysis Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Landscapes
- Transformers For Measuring Instruments (AREA)
Abstract
The invention relates to a current transformer based on permanent magnets and soft magnetic materials, which comprises a complete magnetic circuit part, a first mixed magnetic circuit part, a second mixed magnetic circuit part and a winding part, wherein the complete magnetic circuit part comprises a first magnetic circuit part, a second magnetic circuit part and a first magnetic circuit part, wherein the first magnetic circuit part is a magnetic circuit part, the second magnetic circuit part is a magnetic circuit part, the first magnetic circuit part is a magnetic circuit part, and the second magnetic circuit part is a magnetic circuit part: comprises a first annular iron core made of soft magnetic material; first hybrid magnetic circuit portion: the permanent magnet is coaxially arranged with the complete magnetic circuit part and comprises a second annular iron core and a first permanent magnet, and the first permanent magnet is inserted into the middle of the second annular iron core; a second hybrid magnetic circuit portion: coaxially arranged with the first mixed magnetic circuit part, and comprising a third annular iron core and a second permanent magnet, wherein the second permanent magnet is inserted into the middle of the third annular iron core; winding part: the winding comprises a primary winding and a secondary winding, wherein the primary winding simultaneously passes through three annular iron cores, and the secondary winding is simultaneously wound on the three annular iron cores. Compared with the prior art, the invention has the advantages of excellent transient performance, simple structure, low cost, wide application and the like.
Description
Technical Field
The invention relates to the technical field of current transformers, in particular to a current transformer based on permanent magnets and soft magnetic materials.
Background
Aiming at the problem of poor transient performance of the traditional current transformer, the current research mainly comprises three types of solutions:
The first method mainly compensates or counteracts the core saturation phenomenon by adding hardware devices including but not limited to a switch resistor, controllable power electronics, a power amplifier, a transformer and the like to a secondary circuit of a traditional current transformer. The method can directly refit the existing transformer without the support of digital equipment, but has the problems of complex structure and large volume, and is difficult to engineer and apply;
the second type of method is mainly to implement compensation through various algorithms, such as wavelet algorithm, kalman filter, neural network algorithm, random forest algorithm, etc. The method only needs to insert an algorithm into the host, is quite economical and reliable, is not suitable for a non-digital relay, has larger limitation, and has no universality because the effect of some algorithms depends on the type and parameters of the current transformer;
a third class of methods is to directly use current sensors based on new principles, such as hall current sensors, magnetoresistive current sensors, fluxgate sensors, optical current sensors, etc. However, the novel sensor, in particular to a fluxgate sensor and an optical current sensor, has very high price, complex manufacturing process and high operation and maintenance difficulty, and is not widely used in a power system.
In view of the foregoing, it is necessary to develop a novel current transformer which has a simple principle and structure, is low in cost, and can be widely used in a power system to solve the above problems.
Disclosure of Invention
The invention aims to provide a current transformer based on permanent magnets and soft magnetic materials, which has excellent transient performance and can be widely used.
The aim of the invention can be achieved by the following technical scheme:
a current transformer based on permanent magnets and soft magnetic materials comprises a complete magnetic circuit part, a first mixed magnetic circuit part, a second mixed magnetic circuit part and a winding part,
The complete magnetic circuit portion: comprises a first annular iron core made of soft magnetic material;
the first hybrid magnetic circuit portion: the first mixed magnetic circuit part comprises a second annular iron core and a first permanent magnet, and the first permanent magnet is inserted into the middle of the second annular iron core, so that the first permanent magnet excites the second annular iron core clockwise or anticlockwise;
the second hybrid magnetic circuit portion: the second mixed magnetic circuit part comprises a third annular iron core and a second permanent magnet, and the second permanent magnet is inserted into the middle of the third annular iron core, so that the second permanent magnet excites the third annular iron core clockwise or anticlockwise;
The winding portion: the winding comprises a primary winding and a secondary winding, wherein the primary winding passes through a first annular iron core, a second annular iron core and a third annular iron core simultaneously, and the secondary winding is wound on the first annular iron core, the second annular iron core and the third annular iron core simultaneously.
Further, the complete magnetic circuit portion, the first hybrid magnetic circuit portion, and the second hybrid magnetic circuit portion are closely arranged on the basis of satisfying the insulation distance.
Further, the soft magnetic material comprises one or more of silicon steel sheet, permalloy, amorphous and nanocrystalline soft magnetic alloy, iron-nickel soft magnetic alloy, ferrite, iron-silicon-aluminum and iron-silicon.
Further, the second toroidal core and the third toroidal core are each made of a soft magnetic material.
Further, the secondary winding may be directly connected to a protection device.
Further, the number of the first permanent magnet and the second permanent magnet inserted is in the range of 1 to 5 segments.
Further, the manufacturing materials of the first permanent magnet and the second permanent magnet comprise one or more of neodymium iron boron, samarium cobalt alloy, alnico and iron chromium cobalt.
Further, the turns ratio between the primary winding and the secondary winding is 1:8 to 1:10.
Further, the positions and winding directions between the primary winding and the secondary winding are symmetrically arranged.
Further, the use condition of the current transformer comprises that the primary current is steady-state current, the primary current is forward transient short-circuit current and the primary current is reverse transient short-circuit current.
Compared with the prior art, the invention has the following beneficial effects:
(1) The annular iron core is made of soft magnetic materials and is used for improving the current measurement precision and the measurement stability, the permanent magnet is arranged in the mixed magnetic circuit part and can excite the annular iron core, when the current is transient short-circuit current, the complete magnetic circuit part and one of the mixed magnetic circuit parts enter saturation, and the other mixed magnetic circuit parts exit saturation.
(2) The invention has simple structure, easy acquisition of components, no need of complex identification and control algorithm and corresponding microprocessor, and low cost.
Drawings
Fig. 1 is a schematic diagram of a current transformer according to the present invention.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
The present embodiment provides a current transformer based on permanent magnets and soft magnetic materials, as shown in fig. 1, including:
complete magnetic circuit part 1: the annular iron core 1-1 is completely made of soft magnetic materials, and the design of the annular iron core 1-1 reduces the magnetic leakage of windings, so that the current measurement precision and the measurement stability can be improved;
First hybrid magnetic circuit portion 2: the permanent magnet type magnetic field-activated motor comprises a second annular iron core 2-1 and first permanent magnets 2-2, wherein a main magnetic circuit of the second annular iron core 2-1 is made of soft magnetic materials, one or more sections of first permanent magnets 2-2 are inserted in the middle, the first permanent magnets 2-2 excite the second annular iron core 2-1 clockwise or anticlockwise, the number of the first permanent magnets 2-2 is 1-5, two sections of first permanent magnets 2-2 are adopted in the embodiment, and the first permanent magnets 2-2 excite the second annular iron core 2-1 clockwise and enable the second annular iron core 2-1 to enter deep saturation;
second hybrid magnetic circuit portion 3: comprises a third annular iron core 3-1 and a second permanent magnet 3-2, wherein the main magnetic circuit of the third annular iron core 3-1 is made of soft magnetic materials, one or more sections of the second permanent magnet 3-2 are inserted in the middle, the second permanent magnet 3-2 excites the third annular iron core 3-1 clockwise or anticlockwise, the number of the second permanent magnets 3-2 is 1-5, and two sections of the second permanent magnets 3-2 are adopted in the embodiment, the second permanent magnets 3-2 excite the third annular iron core 3-1 clockwise and enable the third annular iron core 3-1 to enter deep saturation;
Winding portion 4: the secondary winding 4-2 of the embodiment of the invention can be directly connected with the protection device 5, as shown in fig. 1, the turns ratio between the primary winding 4-1 and the secondary winding 4-2 is 1:8 to 1:10, the turns ratio is 1:8, and the positions and the winding directions between the primary winding 4-1 and the secondary winding 4-2 are symmetrically arranged, so that the accuracy of electromagnetic induction and the performance of a mutual inductor are ensured.
Further, the soft magnetic material of the present embodiment is selected from one or more of silicon steel sheet, permalloy, amorphous and nanocrystalline soft magnetic alloy, iron-nickel soft magnetic alloy, ferrite, iron-silicon-aluminum, and iron-silicon.
Further, in this embodiment, the manufacturing materials of the first permanent magnet 2-2 and the second permanent magnet 3-2 include one or more of neodymium iron boron, samarium cobalt alloy, alnico, and iron chromium cobalt.
Further, the complete magnetic circuit portion 1, the first hybrid magnetic circuit portion 2 and the second hybrid magnetic circuit portion 3 are coaxially arranged and should be closely arranged on the basis of satisfying an insulation distance;
the invention provides a current transformer based on permanent magnets and soft magnetic materials, which has the working principle that:
When the primary current is steady-state current, the second annular iron core 2-1 and the third annular iron core 3-1 of the first mixed magnetic circuit part 2 and the second mixed magnetic circuit part 3 are still in a saturated state, and the magnetic density generated by the primary current is mainly concentrated on the complete magnetic circuit part 1, so that the embodiment of the invention keeps the high precision of the traditional current transformer;
When the primary current is a forward transient short-circuit current, the complete magnetic circuit part 1 and the third annular iron core 3-1 are saturated by the current with large amplitude, but the second annular iron core 2-1 is out of saturation and is used for measuring the transient short-circuit current;
when the primary current is a reverse transient short-circuit current, a large magnitude current will bring the complete magnetic circuit portion 1 and the second toroidal core 2-1 into saturation, but will bring the third toroidal core 3-1 out of saturation and be used to measure the transient short-circuit current.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A current transformer based on permanent magnets and soft magnetic materials is characterized by comprising a complete magnetic circuit part (1), a first mixed magnetic circuit part (2), a second mixed magnetic circuit part (3) and a winding part (4),
-Said complete magnetic circuit portion (1): comprises a first annular iron core (1-1) made of soft magnetic material;
-said first hybrid magnetic circuit portion (2): coaxially arranged with the complete magnetic circuit portion (1), the first hybrid magnetic circuit portion (2) comprises a second annular iron core (2-1) and a first permanent magnet (2-2), and the first permanent magnet (2-2) is inserted into the middle of the second annular iron core (2-1) so that the first permanent magnet (2-2) excites the second annular iron core (2-1) clockwise or anticlockwise;
-said second hybrid magnetic circuit portion (3): coaxially arranged with the first hybrid magnetic circuit portion (2), the second hybrid magnetic circuit portion (3) includes a third annular iron core (3-1) and a second permanent magnet (3-2), the second permanent magnet (3-2) is inserted into the middle of the third annular iron core (3-1) so that the second permanent magnet (3-2) excites the third annular iron core (3-1) clockwise or counterclockwise;
-said winding portion (4): the winding comprises a primary winding (4-1) and a secondary winding (4-2), wherein the primary winding (4-1) simultaneously penetrates through a first annular iron core (1-1), a second annular iron core (2-1) and a third annular iron core (3-1), and the secondary winding (4-2) is simultaneously wound on the first annular iron core (1-1), the second annular iron core (2-1) and the third annular iron core (3-1).
2. A current transformer based on permanent magnets and soft magnetic material according to claim 1, characterized in that the complete magnetic circuit part (1), the first hybrid magnetic circuit part (2) and the second hybrid magnetic circuit part (3) are closely arranged on the basis of satisfying the insulation distance.
3. The current transformer based on permanent magnets and soft magnetic material according to claim 1, wherein the soft magnetic material comprises one or more of silicon steel sheet, permalloy, amorphous and nanocrystalline soft magnetic alloy, iron-nickel soft magnetic alloy, ferrite, iron-silicon-aluminum and iron-silicon.
4. A current transformer based on permanent magnets and soft magnetic material according to claim 1, characterized in that the second toroidal core (2-1) and the third toroidal core (3-1) are both made of soft magnetic material.
5. A current transformer based on permanent magnets and soft magnetic material according to claim 1, characterized in that the secondary winding (4-2) is directly connectable to a protection device (5).
6. A current transformer based on permanent magnets and soft magnetic material according to claim 1, characterized in that the number of the first permanent magnets (2-2) and the second permanent magnets (3-2) inserted is in the range of 1 to 5 segments.
7. The current transformer based on the permanent magnet and the soft magnetic material according to claim 1, wherein the manufacturing materials of the first permanent magnet (2-2) and the second permanent magnet (3-2) comprise one or more of neodymium iron boron, samarium cobalt alloy, alnico and iron chromium cobalt.
8. A current transformer based on permanent magnets and soft magnetic material according to claim 1, characterized in that the turns ratio between the primary winding (4-1) and the secondary winding (4-2) is 1:8 to 1:10.
9. A current transformer based on permanent magnets and soft magnetic material according to claim 1, characterized in that the position between the primary winding (4-1) and the secondary winding (4-2), the winding direction, is symmetrically arranged.
10. The current transformer based on permanent magnets and soft magnetic materials according to claim 1, wherein the use condition of the current transformer comprises that the primary current is a steady-state current, the primary current is a forward transient short-circuit current and the primary current is a reverse transient short-circuit current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410228871.2A CN117912806A (en) | 2024-02-29 | 2024-02-29 | Current transformer based on permanent magnet and soft magnetic material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410228871.2A CN117912806A (en) | 2024-02-29 | 2024-02-29 | Current transformer based on permanent magnet and soft magnetic material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117912806A true CN117912806A (en) | 2024-04-19 |
Family
ID=90690736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410228871.2A Pending CN117912806A (en) | 2024-02-29 | 2024-02-29 | Current transformer based on permanent magnet and soft magnetic material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117912806A (en) |
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2024
- 2024-02-29 CN CN202410228871.2A patent/CN117912806A/en active Pending
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