CN210606933U - Transformer and transformer coil thereof - Google Patents
Transformer and transformer coil thereof Download PDFInfo
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- CN210606933U CN210606933U CN201922261873.9U CN201922261873U CN210606933U CN 210606933 U CN210606933 U CN 210606933U CN 201922261873 U CN201922261873 U CN 201922261873U CN 210606933 U CN210606933 U CN 210606933U
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Abstract
A transformer and a transformer coil thereof, wherein the transformer coil comprises a primary coil, a secondary coil, an insulating layer and metal foil layers, the inner side and the outer side of the primary coil are respectively wound with the metal foil layers, the inner side and the outer side of each metal foil layer are respectively wound with the insulating layer, each metal foil layer comprises an overlapping part, the overlapping parts are insulated and isolated through the insulating layers, the metal foil layers are connected with leads used for grounding, and the total thickness of the insulating layers between the metal foil layers on the inner side of the primary coil and the secondary coil is 165-550 micrometers. This scheme installs the coiling metal foil layer additional in transformer primary coil both sides after, has increased primary coil and has become electric capacity C to ground, knows according to U ═ Q/C, and primary coil becomes electric capacity C to ground after increasing, then primary coil diminishes to the voltage U on the insulating layer to ground, correspondingly, and the voltage that uses between coil insulating layer and the metal foil layer on the insulating layer diminishes, and the polarization effect in the insulating layer weakens, and the carrier motion is obstructed to make the whole insulating properties of insulating layer improve.
Description
Technical Field
The utility model relates to a lightning protection transformer technical field especially relates to a transformer and transformer coil thereof.
Background
The lightning protection transformer is a key device of an analog network disk in the existing track circuit, is a low-power double-winding electronic transformer, and mainly plays a role in isolating lightning signals so as to protect indoor equipment from being damaged by the lightning signals and ensure the safety of people and property. In addition to lightning protection performance, the insulation performance of a lightning protection transformer is an important index affecting its application. The excellent insulating property can ensure that the lightning protection transformer is not punctured by lightning in the working process, thereby ensuring the use performance. Therefore, it is necessary to take measures to improve the insulation performance of the lightning protection transformer.
The method generally adopted in the prior art starts from materials and improves the insulation grade of the insulation material of the lightning protection transformer, and the method is effective in improving the insulation performance of the transformer and has the defect of higher cost and brings certain limitation to practical popularization and application.
Therefore, how to improve the insulation performance of the lightning protection transformer is a technical problem that needs to be solved by those skilled in the art at present.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a transformer coil, which can effectively improve the insulation performance. Another object of the present invention is to provide a transformer including the above transformer coil.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a transformer coil comprises a primary coil, a secondary coil, an insulating layer and metal foil layers, wherein the metal foil layers are wound on the inner side and the outer side of the primary coil, the insulating layer is wound on the inner side and the outer side of each metal foil layer, each metal foil layer comprises an overlapping portion, the overlapping portions are insulated and isolated through the insulating layer, a lead wire used for grounding is connected to the metal foil layers, and the total thickness of the insulating layer between the metal foil layers on the inner side of the primary coil and the secondary coil is 165-550 micrometers.
Preferably, the thickness of the metal foil layer is 20-100 microns.
Preferably, the width of the metal foil layer is equal to or greater than the width of the primary coil.
Preferably, the length of the overlapping portion of the metal foil layer located inside the primary coil is 0.2-2 times of the circumference of the inner ring of the primary coil, and the length of the overlapping portion of the metal foil layer located outside the primary coil is 0.2-2 times of the circumference of the outer ring of the primary coil.
Preferably, the width of the insulating layer is greater than or equal to the width of the metal foil layer.
Preferably, 3-10 layers of the insulating layers are wound between the metal foil layer positioned on the inner side of the primary coil and the secondary coil, and the thickness of each layer of the insulating layer is 55 micrometers.
Preferably, the metal foil layer is a copper foil, an aluminum foil, a gold foil, a silver foil or an alloy foil.
Preferably, the insulating layer is an insulating tape or an insulating paper.
The utility model provides a transformer coil, including primary, secondary, insulating layer and metal foil layer, primary's inboard and outside have all been made a winding to have the metal foil layer, and the inboard and the outside of every metal foil layer have all been made a winding to have the insulating layer, and every metal foil layer includes the overlap portion, and the overlap portion passes through the insulating layer insulation and keeps apart, and the metal foil layer is connected with the lead wire that is used for ground connection, and the total thickness that is located the insulating layer between the metal foil layer of primary's inboard and the secondary is 165 microns ~ 550 microns.
Compared with the traditional transformer coil without the metal foil layer, the scheme has the advantages that the metal foil layers are additionally wound on two sides of the primary coil of the transformer, the total thickness of the insulating layer between the inner side metal foil layer and the secondary coil is limited, and the capacitance of the primary coil to the ground is mainly the capacitance of the primary coil to the metal foil layers on two sides of the primary coil. Because the total length of the conducting wire for winding the primary coil is not changed, the thickness of the insulating layer between the inner side metal foil layer and the secondary coil is increased, the radius of the primary coil is increased, the thickness of the primary coil is reduced, the relative area of the primary coil and the metal foil layer is increased, and correspondingly, the distance between the inner side metal foil layer and the outer side metal foil layer of the primary coil is also reduced. As can be seen from the parallel plate capacitance equation, the primary coil capacitance to ground C increases. When Q is an electric quantity, and the capacitance C of the primary coil to the ground increases, the voltage U of the primary coil to the ground decreases, and accordingly, the voltage applied to the insulating layer between the coil insulating layer and the metal foil layer decreases.
The utility model also provides a transformer, this transformer includes as above transformer coil. The derivation process of the beneficial effect of the transformer is substantially similar to the derivation process of the beneficial effect of the transformer coil, and therefore, the description is omitted here.
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, 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 diagram of a transformer coil structure according to an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion A of FIG. 1;
FIG. 3 is a diagram showing the relationship between the number of insulating layers between the secondary coil and the inner metal foil layer and the ground capacitance of the secondary coil according to an embodiment of the present invention;
fig. 4 is a diagram illustrating the relationship between the number of insulating layers between the secondary coil and the inner metal foil layer and the ground capacitance of the primary coil according to an embodiment of the present invention.
In fig. 1 and 2:
1-primary coil, 2-secondary coil, 3-iron core, 4-outer metal foil layer, 5-inner metal foil layer, 6-insulating layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1 and 2, fig. 1 is a schematic diagram of a transformer coil according to an embodiment of the present invention; fig. 2 is a partially enlarged schematic view of a portion a in fig. 1.
In order to effectively improve lightning protection transformer's insulating properties, the utility model provides a transformer coil, including primary 1, secondary 2, insulating layer 6 and metal foil layer, primary 1's inboard and outside all around there being the metal foil layer, as shown in fig. 1 and fig. 2, be inboard metal foil layer 5 and outside metal foil layer 4 respectively, every metal foil layer's inboard and outside all around there being insulating layer 6, every metal foil layer includes the overlap section, the overlap section passes through insulating layer insulation and keeps apart, metal foil layer is connected with the lead wire that is used for ground connection, the total thickness that is located insulating layer 6 between primary 1's the inboard metal foil layer and secondary 2 is 165 microns ~ 550 microns.
The insulating property of the transformer coil to the ground is mainly determined by the insulating layer of the coil and the insulating layer between the coil and the metal foil layer. Compared with the traditional transformer coil without the metal foil layers, the metal foil layers are additionally wound on the two sides of the primary coil 1 of the transformer, the total thickness of the insulating layer 6 between the inner metal foil layer 5 and the secondary coil 2 is limited to be 165-550 microns, and the capacitance of the primary coil 1 to the ground is mainly the capacitance of the primary coil 1 to the metal foil layers on the two sides of the primary coil. Since the total length of the wire wound around the primary coil 1 is constant, as the thickness of the insulating layer 6 between the inner metal foil layer 5 and the secondary coil 2 increases, the radius of the primary coil 1 increases and the thickness decreases, the facing area of the primary coil 1 and the metal foil layers increases, and accordingly, the distance between the metal foil layers on the inner side and the outer side of the primary coil 1 also decreases. As can be seen from the parallel plate capacitance equation, the primary coil capacitance to ground C increases. According to the formula of U ═ Q/C, Q is an electric quantity, U is a voltage, C is a capacitance, and when the capacitance C to ground of the primary coil increases, the voltage U to ground of the primary coil decreases, and accordingly, the voltage applied to the insulating layer between the coil insulating layer and the metal foil layer decreases. In addition, after the metal foil layers are additionally arranged on the two sides of the transformer coil, the metal foil layers have good heat conduction performance, so that the heat dissipation of the transformer can be accelerated, and the temperature reduction is also beneficial to improving the insulation performance of the insulation layer.
The structure of the transformer coil is illustrated by a method of attaching metal foil layers on both sides of the primary coil 1 of the transformer. The specific installation process is as follows:
1) winding a coil with a certain number of turns on the transformer iron core 3 as required to form a secondary coil 2;
2) winding a certain number of insulating layers 6 on the outer side of the secondary coil 2, then winding an inner metal foil layer 5, overlapping the inner metal foil layer 5, insulating and isolating the overlapped part through the insulating layers, leading out a lead from the inner metal foil layer 5, and then winding a certain number of insulating layers 6 on the outer side of the inner metal foil layer 5;
3) winding the primary coil 1 outside the insulating layer 6 in the step 2), and winding a certain number of insulating layers 6 outside the primary coil 1;
4) in the step 3), an outer metal foil layer 4 is wound on the outer side of an insulating layer 6 outside the primary coil 1, the outer metal foil layer 4 is partially overlapped but not conducted, the overlapped part is isolated by the insulating layer, a lead is led out of the outer metal foil layer 4, and then a certain number of layers of insulating layers 6 are wound on the outer side of the outer metal foil layer 4;
5) and finally, conducting the leads reserved on the metal foil layers on the inner side and the outer side in the step 2) and the step 4), and finishing the manufacturing of the transformer coil.
The above-described structure in which the metal foil layers are attached to both sides of the primary coil 1 is applicable to a low-power double-winding electronic transformer such as an R-type, CD-type, ED-type, or XED-type electronic transformer.
It should be noted that the metal foil layer can be selected from copper foil, aluminum foil, gold foil, silver foil or alloy foil. Preferably, the thickness of the metal foil layer is 20-100 microns. The width of the metal foil layer is greater than or equal to the width of the primary coil body.
Preferably, the length of the overlapping portion of the inner metal foil layer 5 located inside the primary coil 1 is 0.2 to 2 times the circumference of the inner ring of the primary coil 1, and the length of the overlapping portion of the outer metal foil layer 4 located outside the primary coil 1 is 0.2 to 2 times the circumference of the outer ring of the primary coil 1.
Before winding the metal foil layer, an insulating layer 6 is required to be wound on the outer layer of the secondary coil 2 of the transformer, and the width of the insulating layer 6 is preferably designed to be larger than or equal to that of the metal foil layer, so that the protective effect is mainly achieved, and electric leakage is prevented; preferably, 3 to 10 insulating layers are wound between the inner metal foil layer 5 and the secondary coil 2, and each insulating layer has a thickness of 55 μm. After the metal foil layer is wound, an insulating layer 6 is wound on the outer side of the metal foil layer, the width of the insulating layer 6 is larger than or equal to that of the metal foil layer, and the insulating layer 6 can be made of insulating adhesive tapes or other insulating paper.
Referring to fig. 3 and 4, fig. 3 is a graph showing the relationship between the number of insulating layers between the secondary coil and the inner metal foil layer and the capacitance of the secondary coil to ground, and fig. 4 is a graph showing the relationship between the number of insulating layers between the secondary coil and the inner metal foil layer and the capacitance of the primary coil to ground. The number of layers on the abscissa is the number of insulating layers. Therefore, under different frequencies, the metal foil layers are additionally arranged on the two sides of the primary coil, and the ground capacitance of the primary coil is higher than that of the secondary coil. In addition, the number of insulating layers also has a significant effect on the capacitance of the coil to ground.
In order to verify the effect of improving the insulating property of the transformer coil after the metal foil layer is added, the insulating properties of R-type transformers made of three different potting materials are respectively tested, two transformers are tested for each type, the environment temperature is 90 ℃, the applied voltage is 1000V, the pressurizing time is 60s, copper foils are added on two sides of a primary coil of each transformer, and no copper foil is added on a secondary coil of each transformer for comparison.
TABLE 1 Transformer insulation Properties (M omega) for different potting materials
The test data results are shown in Table 1, wherein 12-0 represents the insulation resistance of the primary coil to the ground, 34-0 represents the insulation resistance of the secondary coil to the ground, and 12-34 represents the insulation performance of the primary coil to the secondary coil. The material 1, the material 2 and the material 3 represent three R-shaped transformers made of different potting materials, one R-shaped transformer made of each potting material is manufactured through the process A and the process B and tested, and a total of 6 transformers are tested at this time; the remaining table contents are the insulation resistance values tested in units of M Ω. As can be seen from Table 1, the insulation performance of the transformer coil to the ground is obviously improved after the copper foil is additionally arranged.
The utility model discloses following beneficial effect has:
1) according to the scheme, the conductive metal foil layers are additionally arranged on the two sides of the transformer coil respectively to form a sandwich structure of metal foil, coil and metal foil, so that the polarization effect of an electric field on an insulating layer of the transformer coil can be effectively reduced, the blocking effect of current carriers in the insulating layer is improved, and the ground insulation performance of the transformer coil is improved;
2) by additionally arranging the metal foil, the heat dissipation rate of the transformer in the working process is accelerated to a certain extent, the temperature of an insulating layer of a transformer coil is reduced, and the insulating resistance of the transformer coil is improved.
3) The scheme has the advantages of low cost, stability, reliability and convenient popularization.
The utility model also provides a transformer, this transformer includes as above transformer coil. The derivation process of the beneficial effect of the transformer is substantially similar to the derivation process of the beneficial effect of the transformer coil, and therefore, the description is omitted here.
It should be noted that the transformer provided in this embodiment may be an R-type, CD-type, ED-type, or XED-type low-power dual-winding electronic transformer, and may also be another type of transformer, which is not described herein again.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A transformer coil is characterized by comprising a primary coil, a secondary coil, an insulating layer and metal foil layers, wherein the metal foil layers are wound on the inner side and the outer side of the primary coil, the insulating layer is wound on the inner side and the outer side of each metal foil layer, each metal foil layer comprises an overlapping part, the overlapping parts are insulated and isolated through the insulating layer, a lead wire used for grounding is connected to the metal foil layers, and the total thickness of the insulating layer between the metal foil layers on the inner side of the primary coil and the secondary coil is 165-550 micrometers.
2. The transformer coil according to claim 1, wherein the metal foil layer has a thickness of 20 to 100 μm.
3. The transformer coil of claim 1, wherein the metal foil layer has a width equal to or greater than a width of the primary coil.
4. The transformer coil according to claim 1, wherein the length of the overlapped portion of the metal foil layer located inside the primary coil is 0.2-2 times the circumference of the inner ring of the primary coil, and the length of the overlapped portion of the metal foil layer located outside the primary coil is 0.2-2 times the circumference of the outer ring of the primary coil.
5. The transformer coil of claim 1, wherein the insulating layer has a width greater than or equal to a width of the metal foil layer.
6. The transformer coil according to claim 1, wherein 3 to 10 layers of the insulating layers are wound between the metal foil layer located inside the primary coil and the secondary coil, and each layer of the insulating layers has a thickness of 55 μm.
7. The transformer coil of claim 1, wherein the metal foil layer is a copper foil, an aluminum foil, a gold foil, a silver foil, or an alloy foil.
8. The transformer coil according to claim 1, wherein the insulating layer is an insulating tape or an insulating paper.
9. A transformer, characterized by comprising a transformer coil according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922261873.9U CN210606933U (en) | 2019-12-13 | 2019-12-13 | Transformer and transformer coil thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922261873.9U CN210606933U (en) | 2019-12-13 | 2019-12-13 | Transformer and transformer coil thereof |
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| Publication Number | Publication Date |
|---|---|
| CN210606933U true CN210606933U (en) | 2020-05-22 |
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| CN201922261873.9U Active CN210606933U (en) | 2019-12-13 | 2019-12-13 | Transformer and transformer coil thereof |
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| CN (1) | CN210606933U (en) |
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Effective date of registration: 20211119 Address after: 102613 No.456, langlongsi village, Huangcun Town, Daxing District, Beijing Patentee after: BEIJING RAILWAY SIGNAL Co.,Ltd. Address before: 102613 No.456, langlongsi village, Huangcun Town, Daxing District, Beijing Patentee before: Rail Transit Technology Research Institute of Tonghao (Beijing) Rail Industry Group Co.,Ltd. Patentee before: China Communications (Beijing) Railway Industry Group Co., Ltd |