CN113593814A - Open-type current transformer and manufacturing method thereof - Google Patents
Open-type current transformer and manufacturing method thereof Download PDFInfo
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- CN113593814A CN113593814A CN202110626338.8A CN202110626338A CN113593814A CN 113593814 A CN113593814 A CN 113593814A CN 202110626338 A CN202110626338 A CN 202110626338A CN 113593814 A CN113593814 A CN 113593814A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/02—Casings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/06—Coil winding
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/06—Coil winding
- H01F41/098—Mandrels; Formers
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Abstract
The invention relates to an open-type current transformer and a manufacturing method thereof, wherein the open-type current transformer comprises a shell and an annular iron core, the shell comprises an upper shell and a lower shell, the upper shell is movably connected with the lower shell, the iron core comprises an upper iron core accommodated in the upper shell and a lower iron core accommodated in the lower shell, a secondary winding is wound on the lower iron core, and a compensation winding is arranged on the upper iron core; the compensation winding is arranged on the upper iron core without the secondary winding to compensate the secondary winding, so that various parameters of the secondary winding meet parameter requirements, the yield of products is improved, the requirement on iron core materials is lowered, the wire consumption of the secondary winding is reduced, the production efficiency is doubled, the production cost is greatly lowered, and very obvious economic benefits are achieved.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to an open-type current transformer and a manufacturing method thereof.
Background
Current transformers are largely classified into closed-loop current transformers and open-loop current transformers depending on the application. The closed-loop current transformer needs to be installed in advance when a distribution circuit is installed, and a cable penetrates through the inside of the transformer through hole and then is connected to the distribution circuit. The open-loop current transformer can be installed in the existing power distribution circuit, can also be installed under the condition of not changing and not needing to be powered off, is convenient and labor-saving, and is applied more and more widely in recent years. However, since the open-type (open-loop) current transformer needs to break the magnetic circuit structurally, the leakage flux is larger than that of the conventional closed-loop current transformer, and it is difficult to achieve the same precision level. Particularly, the open-type current transformer with small transformation ratio has higher precision and is difficult to produce.
Generally, the open-type current transformer needs to have higher precision, a high-permeability soft magnetic material is adopted, the cross section area of an iron core is increased, the internal resistance of a secondary winding is reduced, and a high production process is adopted, so that the product cost is greatly increased, and the higher qualification rate of the product cannot be ensured.
Disclosure of Invention
The invention aims to solve the technical problem of providing an open-type current transformer and a manufacturing method thereof, wherein a closed compensation winding is arranged on an iron core part without a secondary winding to compensate the secondary winding, so that various parameters of the secondary winding meet parameter requirements, and the problems in the prior art are solved.
In order to solve the technical problems, the technical scheme of the invention is as follows: an open-type current transformer comprises a shell and an annular iron core; the shell comprises an upper shell and a lower shell, and the upper shell is movably connected with the lower shell; the iron core comprises an upper iron core accommodated in the upper shell and a lower iron core accommodated in the lower shell, a secondary winding is wound on the lower iron core, and a compensation winding is arranged on the upper iron core.
As a further improvement, an insulating sleeve is sleeved on the upper iron core, and the compensation winding is wound on the insulating sleeve.
As a further improvement, the upper iron core is arranged opposite to the mouth part of the lower iron core; when the upper shell and the lower shell are closed, the upper iron core and the lower iron core are driven to be in butt joint to form a complete iron core.
As a further improvement, the top of the upper shell is provided with a top opening for the upper iron core to enter, and the bottom of the upper shell is provided with a bottom through hole for two ends of the upper iron core to penetrate out; an upper protecting cover is connected in the top opening in a clamping mode, and an elastic sheet is arranged between the upper protecting cover and the upper iron core.
As a further improvement, the bottom of the lower shell is provided with a bottom opening for the lower iron core to enter, and the top of the lower shell is provided with a top through hole for two ends of the lower iron core to penetrate out; a framework for supporting the lower iron core is arranged in the lower shell, the framework is composed of an upper framework and a lower framework which can be separated from each other, an installation groove is formed between the upper framework and the lower framework, the lower iron core is located in the installation groove, and two ends of the lower iron core respectively extend to the outer side of the installation groove; a lower protecting cover is clamped in the bottom opening; the secondary winding is wound on the outer side of the framework.
As a further improvement, the two ends of the secondary winding are respectively connected with a wire, the framework is provided with a wire positioning groove, and the lower protecting cover is provided with a wire passing hole for the wire to penetrate out.
As a further improvement, an upper sealing ring is arranged between the upper iron core and the bottom port correspondingly, and a lower sealing ring is arranged between the lower iron core and the top port correspondingly.
As a further improvement, a threading hole is arranged between the upper shell and the lower shell; one end of the upper shell and one end of the lower shell are hinged with each other through a pin, and one side of the threading hole is opened or closed when the upper shell or the lower shell rotates around the pin; the other end of the upper shell is provided with a buckle, and the corresponding end of the lower shell is provided with a clamping block matched with the buckle.
As a further improvement, the lower shell is provided with a fixing hole positioned on the inner side of the threading hole.
A manufacturing method of the open-type current transformer comprises the following steps:
s1, grinding and polishing the butt joint surface of the upper iron core and the lower iron core;
s2, winding the secondary winding on the lower iron core;
s3, installing the lower iron core wound with the secondary winding into the lower shell;
s4, winding the compensation winding on the upper iron core by a lead;
s5, installing the upper iron core wound with the compensation winding into the upper shell;
and S6, assembling and combining the upper shell and the lower shell.
Due to the adoption of the technical scheme, the open-type current transformer comprises a shell and an annular iron core, wherein the shell comprises an upper shell and a lower shell, the upper shell is movably connected with the lower shell, the iron core comprises an upper iron core accommodated in the upper shell and a lower iron core accommodated in the lower shell, a secondary winding is wound on the lower iron core, and a compensation winding is arranged on the upper iron core; the compensation winding is arranged on the upper iron core without the secondary winding to compensate the secondary winding, so that various parameters of the secondary winding meet parameter requirements, the yield of products is improved, the requirement on iron core materials is lowered, the wire consumption of the secondary winding is reduced, the production efficiency is doubled, the production cost is greatly lowered, and very obvious economic benefits are achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic structural view of an upper housing of an embodiment of the present invention;
FIG. 3 is a schematic structural view of a lower housing of an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a skeleton according to an embodiment of the invention;
fig. 5 is a flowchart of a method for manufacturing an on-type current transformer according to an embodiment of the present invention.
In the figure: 1-a shell; 2-iron core; 3-an upper shell; 4-a lower shell; 5, upper iron core; 6-lower iron core; 7-a secondary winding; 8-a compensation winding; 9-an insulating sleeve; 10-top opening; 11-bottom through opening; 12-an upper protective cover; 13-a spring plate; 14-bottom opening; 15-top through opening; 16-a backbone; 17-upper framework; 18-lower skeleton; 19-mounting grooves; 20-lower protective cover; 21-a wire; 22-a wire positioning slot; 23-a wire through hole; 24-upper sealing ring; 25-lower sealing ring; 26-caulking groove; 27-threading holes; 28-pin; 29-a connecting portion; 30-pin holes; 31-buckling; 32-a fixture block; 33-fixing hole.
Detailed Description
As shown in fig. 1 to 5, an open-type current transformer includes a housing 1 and an annular iron core 2; the shell 1 comprises an upper shell 3 and a lower shell 4, and the upper shell 3 is movably connected with the lower shell 4. The iron core 2 comprises an upper iron core 5 accommodated in the upper shell 3 and a lower iron core 6 accommodated in the lower shell 4, specifically, the upper iron core 5 and the lower iron core 6 are both in a U shape, and the mouth parts of the upper iron core 5 and the lower iron core 6 are arranged oppositely; when the upper shell 3 and the lower shell 4 are closed, the upper iron core 5 and the lower iron core 6 are driven to be in butt joint to form the complete iron core 2. The lower iron core 6 is wound with a secondary winding 7, and the upper iron core 5 is provided with a compensation winding 8.
The compensation winding 8 arranged on the upper iron core 5 without the secondary winding 7 needs to be designed and wound according to the output parameters of the current transformer, and the specific principle and the method are as follows:
when the ratio difference (in-phase component) of the current transformer is positive, the compensation winding 8 with one or two or more turns made of conducting wires or other conductors insulated from the iron core 2 and other parts of the transformer on the upper iron core 5 can be adopted to compensate the ratio difference error. After the compensation winding 8 is arranged, the ratio difference can deviate towards the negative direction, so that the ratio difference of the current transformer meets the precision requirement.
When the phase difference (orthogonal component) of the current transformer is larger in the positive direction, the upper iron core 5 can be used for manufacturing one-turn or two-turn or multi-turn compensation winding 8 by using a conducting wire or other conductors insulated from the iron core 2 and other parts of the transformer to compensate larger phase errors. After the compensation winding 8 is arranged, the phase difference can deviate towards the negative direction, so that the phase difference of the current transformer meets the precision requirement.
In actual operation, the effect of the compensation is related to the number of turns of the compensation winding 8 and the internal resistance. Under the condition that the set compensation winding 8 has the same lead sectional area, the more the number of winding turns is, the larger the compensation amount is; the smaller the number of winding turns, the smaller the compensation amount. Under the condition that the set number of turns of the compensation winding is constant, the smaller the internal resistance of the lead is, the larger the compensation quantity is; the larger the internal resistance of the wire is, the smaller the compensation amount is.
In addition, the contrast value difference and the phase difference of the arranged compensation winding 8 are always compensated at the same time, the principle follows the description, and the design purpose can be achieved only by designing the number of turns of the compensation winding 8 and the section of a lead according to the method and the principle according to the comprehensive error of the current transformer, so that the precision of the current transformer reaches the design precision.
The compensation winding 8 is arranged on the upper iron core 5 without the secondary winding 7 to compensate the secondary winding 7, so that various parameters of the secondary winding 7 meet parameter requirements, the yield of products is improved, the requirement on the material of the iron core 2 is lowered, the wire consumption of the secondary winding 7 is reduced, the production efficiency is improved in multiples, the production cost is greatly reduced, and the economic benefit is very obvious.
The upper iron core 5 is sleeved with an insulating sleeve 9, and the compensation winding 8 is wound on the insulating sleeve 9. The insulating sleeve 9 serves to improve the insulation between the compensation winding 8 and the upper core 5.
The top of the upper shell 3 is provided with a top opening 10 for the upper iron core 5 to enter, and the bottom of the upper shell 3 is provided with a bottom through hole 11 for two ends of the upper iron core 5 to penetrate out; an upper protecting cover 12 is clamped in the top opening 10, and an elastic sheet 13 is arranged between the upper protecting cover 12 and the upper iron core 5. The elastic sheet 13 is used for making the upper iron core 5 and the end part of the lower iron core 6 tightly attached when the upper shell 3 and the lower shell 4 are closed.
The bottom of the lower shell 4 is provided with a bottom opening 14 for the lower iron core 6 to enter, and the top of the lower shell 4 is provided with a top through hole 15 for two ends of the lower iron core 6 to penetrate out; a framework 16 for supporting the lower iron core 6 is arranged in the lower shell 4, the framework 16 is composed of an upper framework 17 and a lower framework 18 which can be separated from each other, an installation groove 19 is formed between the upper framework 17 and the lower framework 18, the lower iron core 6 is positioned in the installation groove 19, and two ends of the lower iron core 6 respectively extend to the outer side of the installation groove 19; a lower housing 20 is snapped into the bottom opening 14. The winding of secondary winding 7 is in the outside of skeleton 16, specifically, both ends are equipped with the supporting part respectively about the skeleton, and secondary winding 7 twines between two supporting parts. The provision of the bobbin 16 can improve the stability of fixing to the lower core 6 and the insulation between the secondary winding 7 and the lower core 6.
Two ends of the secondary winding 7 are respectively connected with a wire 21, the framework 16 is provided with a wire positioning slot 22, and the lower protecting cover 20 is provided with a wire passing hole 23 for the wire 21 to pass through.
Go up iron core 5 and corresponding be equipped with sealing washer 24 between bottom opening 11, iron core 6 and corresponding down be equipped with sealing washer 25 between the top opening 15. Specifically, the upper seal ring 24 is sleeved on the upper iron core 5 located on the inner side of the bottom through hole 11; an embedded groove 26 is formed between the lower iron core 6 and the corresponding top through 15, the embedded groove 26 is located on the outer side of the lower shell 4, and the lower sealing ring 25 is located in the embedded groove 26. The joint of the iron core 2 and the shell 1 is well sealed through the upper sealing ring 24 and the lower sealing ring 25, so that the waterproof effect is achieved.
A threading hole 27 is arranged between the upper shell 3 and the lower shell 4. Go up casing 3 with the one end of casing 4 is articulated each other through pin 28, and is specific, and the one end of going up casing 3 and casing 4 is equipped with connecting portion 29 respectively, all is equipped with the pinhole 30 that supplies pin 28 to pass on two connecting portion 29. Go up casing 3 or casing 4 winds make when pin 28 rotates one side of through wires hole 27 is opened or is closed, through rotating casing 3 or casing 4 down around pin 28 and making the one end separation of going up casing 3 and casing 4, go up casing 3 and casing 4 and drive one side of through wires hole 27 and open to be convenient for place the cable in through wires hole 27. The other end of the upper shell 3 is provided with a buckle 31, one end corresponding to the lower shell 4 is provided with a fixture block 32 matched with the buckle 31, and the buckle 31 and the fixture block 32 are matched to prevent the upper shell 3 and the lower shell 4 from being opened randomly.
The lower case 4 is provided with a fixing hole 33 located inside the threading hole 27. The fixing hole 33 is used for allowing a nylon cable tie to pass through so as to fix the product on the cable through the nylon cable tie.
A manufacturing method of the open-type current transformer comprises the following steps:
and S1, performing grinding and polishing treatment on the butt joint surface of the upper iron core 5 and the lower iron core 6 to reduce the magnetic leakage.
And S2, winding the secondary winding 7 on the lower iron core 6. Firstly, combining a lower iron core 6 with a framework 16, placing the lower iron core 6 into a mounting groove 19 between an upper framework 17 and a lower framework 18, and buckling the upper framework 17 with the lower framework 18; winding the secondary winding 7 on the framework 16 by using a winding machine or other methods, and respectively folding the wire head and the wire tail of the secondary winding 7 to the corresponding wire positioning grooves 22; the two wires 21 are respectively fixed in the corresponding wire positioning grooves 22, and the wire ends and the wire tails of the secondary windings 7 are respectively well welded with the corresponding wires 21.
S3, the lower iron core 6 wound with the secondary winding 7 is installed into the lower housing 4, then the lower protecting cover 20 is fastened into the bottom opening 14, the two wires 21 respectively penetrate through the corresponding wire passing holes 27, and the two lower sealing rings 25 are respectively embedded into the caulking grooves 26.
And S4, winding the compensation winding 8 on the upper iron core 5 by using a conducting wire. Firstly, a compensation winding 8 is wound on an insulating sleeve 9 according to the process requirements (ratio difference and phase difference) of the current transformer (if the output parameter of the current transformer reaches the standard, the compensation winding 8 is not needed, if the output parameter does not reach the standard, one circle, two circles or a plurality of circles of compensation windings 8 can be arranged at the same position or different positions of an upper iron core 5), and then the insulating sleeve 9 is sleeved on the upper iron core 5.
S5, installing the upper iron core 5 wound with the compensation winding 8 into the upper case 3. Firstly, two upper sealing rings 24 are respectively sleeved at two ends of an upper iron core 5; the upper iron core 5 wound with the compensation winding 8 is placed in the upper shell 3, the elastic sheet 13 is placed at the top of the upper iron core 5, and the upper protective cover 12 is buckled in the top opening 10.
S6, assembling and combining the upper case 3 and the lower case 4. The upper case 3 and the lower case 4 are butt-jointed, and a pin 28 is driven into a pin hole 30 of a connecting portion 29 of the upper case 3 and the lower case 4, thereby completing the assembly.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. An open-type current transformer, its characterized in that: comprises a shell and an annular iron core; the shell comprises an upper shell and a lower shell, and the upper shell is movably connected with the lower shell; the iron core comprises an upper iron core accommodated in the upper shell and a lower iron core accommodated in the lower shell, a secondary winding is wound on the lower iron core, and a compensation winding is arranged on the upper iron core.
2. The open-type current transformer of claim 1, wherein: the upper iron core is sleeved with an insulating sleeve, and the compensation winding is wound on the insulating sleeve.
3. The open-type current transformer of claim 1, wherein: the upper iron core and the lower iron core are both U-shaped, and the mouth parts of the upper iron core and the lower iron core are oppositely arranged; when the upper shell and the lower shell are closed, the upper iron core and the lower iron core are driven to be in butt joint to form a complete iron core.
4. A switched-on current transformer as claimed in claim 3, characterized in that: the top of the upper shell is provided with a top opening for the upper iron core to enter, and the bottom of the upper shell is provided with a bottom through hole for two ends of the upper iron core to penetrate out; an upper protecting cover is connected in the top opening in a clamping mode, and an elastic sheet is arranged between the upper protecting cover and the upper iron core.
5. The open-type current transformer of claim 4, wherein: the bottom of the lower shell is provided with a bottom opening for the lower iron core to enter, and the top of the lower shell is provided with a top through hole for two ends of the lower iron core to penetrate out; a framework for supporting the lower iron core is arranged in the lower shell, the framework is composed of an upper framework and a lower framework which can be separated from each other, an installation groove is formed between the upper framework and the lower framework, the lower iron core is located in the installation groove, and two ends of the lower iron core respectively extend to the outer side of the installation groove; a lower protecting cover is clamped in the bottom opening; the secondary winding is wound on the outer side of the framework.
6. The open-type current transformer of claim 5, wherein: the two ends of the secondary winding are respectively connected with a wire, the framework is provided with a wire positioning groove, and the lower protecting cover is provided with a wire passing hole for the wire to penetrate out.
7. The open-type current transformer of claim 5, wherein: go up the iron core and corresponding be equipped with the sealing washer between the bottom opening, down the iron core and corresponding be equipped with the lower sealing washer between the top opening.
8. The open-type current transformer of claim 1, wherein: a threading hole is formed between the upper shell and the lower shell; one end of the upper shell and one end of the lower shell are hinged with each other through a pin, and one side of the threading hole is opened or closed when the upper shell or the lower shell rotates around the pin; the other end of the upper shell is provided with a buckle, and the corresponding end of the lower shell is provided with a clamping block matched with the buckle.
9. The open-type current transformer of claim 8, wherein: and the lower shell is provided with a fixing hole positioned on the inner side of the threading hole.
10. A method for manufacturing an open-type current transformer according to any one of claims 1 to 9, comprising the steps of:
s1, grinding and polishing the butt joint surface of the upper iron core and the lower iron core;
s2, winding the secondary winding on the lower iron core;
s3, installing the lower iron core wound with the secondary winding into the lower shell;
s4, winding the compensation winding on the upper iron core by a lead;
s5, installing the upper iron core wound with the compensation winding into the upper shell;
and S6, assembling and combining the upper shell and the lower shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110626338.8A CN113593814A (en) | 2021-06-04 | 2021-06-04 | Open-type current transformer and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110626338.8A CN113593814A (en) | 2021-06-04 | 2021-06-04 | Open-type current transformer and manufacturing method thereof |
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