CN210535485U - Distribution transformer low-voltage outlet copper bar insulation device and distribution transformer - Google Patents
Distribution transformer low-voltage outlet copper bar insulation device and distribution transformer Download PDFInfo
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- CN210535485U CN210535485U CN201921399898.9U CN201921399898U CN210535485U CN 210535485 U CN210535485 U CN 210535485U CN 201921399898 U CN201921399898 U CN 201921399898U CN 210535485 U CN210535485 U CN 210535485U
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Abstract
The utility model discloses a distribution transformer low pressure is qualified for next round of competitions copper bar insulator arrangement and distribution transformer, include: the transformer comprises a transformer low-voltage upper clamping piece, a transformer outgoing copper bar, a first insulating plate and a second insulating plate, wherein the first insulating plate is arranged between the transformer low-voltage upper clamping piece and the transformer outgoing copper bar; the width of the first insulating plate is larger than that of the lower-voltage upper clamping piece of the transformer; the width of the second insulating plate is at least larger than the height of the last two stages of iron cores close to the outgoing line copper bar. The utility model discloses beneficial effect: the creepage distance between the outgoing line copper bar and the transformer low-voltage clamping piece can be increased, and the insulating capability is further improved; meanwhile, the electrical insulation performance between the low-voltage leading-out copper bar of the distribution transformer and the transformer core is improved, and the reliability of the product is improved.
Description
Technical Field
The utility model relates to a distribution transformer technical field especially relates to a distribution transformer low pressure is qualified for next round of competitions copper bar insulator arrangement and distribution transformer.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The distribution transformer comprises a coil, an iron core, an oil tank, transformer oil, a sleeve and the like, wherein the coil is divided into a high-voltage coil and a low-voltage coil, and voltage conversion and energy transfer between high voltage and low voltage are realized through electromagnetic induction. The iron core forms a magnetic circuit of the distribution transformer, hysteresis loss is reduced, no-load loss of the transformer can be reduced, and efficiency of the transformer is improved. The transformer oil is filled in the oil tank, so that the insulation level and the heat dissipation capacity of the transformer can be improved.
The low-voltage coil is formed by winding copper foil and interlayer insulation, the head end and the tail end of the coil are led out by copper bars and are welded with the copper foil by argon arc welding. After the low-voltage coil is wound, the main insulation is added, the high-voltage coil is wound on the outer side of the low-voltage coil in a sleeving winding mode, and a layer of contraction belt is wound on the outer layer of the high-voltage coil to complete winding of the coil.
On the low-voltage side of the distribution transformer, an outgoing copper bar of a low-voltage coil phase line is led out from between a transformer iron core and a low-voltage clamping piece; in order to prevent the low-voltage outlet copper bar from causing short circuit to the clamping piece or the iron core due to voltage breakdown, the insulation between the outlet copper bar and the transformer low-voltage clamping piece and the transformer iron core needs to be realized.
In the prior art, the insulation isolation between the outgoing copper bar of the phase line of the low-voltage coil and the low-voltage clamping piece of the transformer has the following problems: because the insulating distance of copper bar to the folder is less, though there is transformer oil insulation, in case there is moisture, impurity or foreign matter in the transformer oil, transformer oil insulating properties descends, causes low pressure to ground insulation breakdown easily. In addition, when the surface of the channel steel clamping piece close to the outgoing line copper bar is convex, the insulation distance of the copper bar to the ground is shortened, and the ground breakdown is easily caused.
In the prior art, the insulation isolation between the outgoing line copper bar and the iron core of the phase line of the low-voltage coil has the following problems: the iron core adopts insulating paper board to keep apart, because insulating paper board width and last stage iron core highly uniform, when the iron core fastening behind the coil suit, the iron core that is close to the copper bar of being qualified for the next round of competitions is out the copper bar easily, and the iron core piece inclines low voltage coil for the copper bar reduces with the distance of iron core piece, causes the low pressure to puncture to ground.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides a distribution transformer low-voltage outlet copper bar insulation device and a distribution transformer, which can increase the creepage distance between the outlet copper bar and the transformer low-voltage clamping piece, thereby improving the insulation capability; meanwhile, the electrical insulation performance between the low-voltage leading-out copper bar of the distribution transformer and the transformer core is improved, and the reliability of the product is improved.
In some embodiments, the following technical scheme is adopted:
the utility model provides a distribution transformer low pressure copper bar insulation apparatus that is qualified for next round of competitions, includes: the transformer comprises a transformer low-voltage upper clamping piece, a transformer outgoing copper bar, a first insulating paperboard and a second insulating paperboard, wherein the first insulating paperboard is arranged between the transformer low-voltage upper clamping piece and the transformer outgoing copper bar; the width of the first insulating paper board is larger than that of the lower-voltage upper clamping piece of the transformer; the width of the second insulating plate is at least larger than the height of the two-stage iron core close to the outlet copper bar.
Furthermore, after the transformer outgoing copper bar is led out from the low-voltage coil, the transformer outgoing copper bar is bound by three layers of crepe paper.
Further, the crepe paper is soaked in transformer oil after being subjected to vacuum drying treatment.
Furthermore, the first insulating paper board and the second insulating paper board are soaked in transformer oil after being subjected to vacuum drying treatment.
Furthermore, the transformer iron core is formed by silicon steel sheets in an overlapped mode, the cross section of the iron core is oval, and the silicon steel sheets are clamped by a high-voltage clamping piece and a low-voltage clamping piece through pull rod bolts after being overlapped.
In some embodiments, the following technical scheme is adopted:
a distribution transformer comprises the distribution transformer low-voltage outlet copper bar insulation device.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses first insulation board arranges in on the transformer low pressure folder and goes out between the line copper bar, and its width is greater than the width of folder on the transformer, has increaseed the creepage distance of folder on the copper bar that is qualified for the next round of competitions to the low pressure, has improved dielectric strength.
(2) The utility model discloses transformer core is arranged in to the second insulation board and is qualified for the next round of competitions between the copper bar, and its width is greater than the height that is close to the two-stage iron core of the copper bar of being qualified for the next round of competitions at least, has improved the electrical insulation performance that the copper bar was drawn forth to the distribution transformer low pressure, has improved the reliability of product.
Drawings
Fig. 1 is a schematic structural view of a low-voltage outlet copper bar insulation device of a distribution transformer in accordance with an embodiment;
the low-voltage upper clamping piece comprises a low-voltage upper clamping piece 1, a first insulating paper board 2, an outlet copper bar 3, a second insulating paper board 4, an iron core 5 and a high-voltage upper clamping piece 6.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example one
In one or more embodiments, a distribution transformer low-voltage outlet copper bar insulation device is disclosed, as shown in fig. 1, and comprises: the transformer comprises a first insulation paper board 2 arranged between a transformer low-voltage upper clamping piece 1 and a transformer outgoing copper bar 3, and a second insulation paper board 4 arranged between the transformer outgoing copper bar 3 and a transformer iron core 5; the width of the first insulating paper board 2 is greater than that of the transformer low-voltage upper clamping piece 1; the width of the second insulating paper board 4 is at least larger than the height of the two-stage iron core 5 close to the outgoing line copper bar.
The distribution transformer comprises a coil, an iron core 5, an oil tank, transformer oil, a sleeve and the like, wherein the coil is divided into a high-voltage coil and a low-voltage coil, and voltage conversion and energy transfer between high voltage and low voltage are realized through electromagnetic induction. The iron core 5 forms a magnetic circuit of the distribution transformer and is formed by laminating high-performance silicon steel sheets, hysteresis loss can be reduced, no-load loss of the transformer can be reduced, and efficiency of the transformer is improved. The transformer oil is filled in the oil tank, so that the insulation level and the heat dissipation capacity of the transformer can be improved.
The low-voltage coil is formed by winding copper foil and interlayer insulation, the head end and the tail end of the coil are led out by copper bars and are welded with the copper foil by argon arc welding. After the low-voltage coil is wound, the main insulation is added, the high-voltage coil is wound on the outer side of the low-voltage coil in a sleeving winding mode, and a layer of contraction belt is wound on the outer layer of the high-voltage coil to complete winding of the coil.
The iron core 5 is formed by stacking silicon steel sheets with the thickness of less than 0.35mm, the thickness is generally more than 10 grades, and the cross section of the iron core 5 is oval, so that the magnetic leakage loss can be reduced to the maximum extent. The iron core 5 is clamped by a clamp piece through a draw bar bolt after being stacked. The iron core 5 is grounded at one point. The iron core 5 is formed by connecting three iron core columns through upper and lower yokes to form a complete magnetic circuit. The other corresponding side of the low-voltage upper clamping piece 1 is a high-voltage upper clamping piece 6.
The high-low voltage coil is sleeved on three iron core columns of the transformer iron core, an upper pressing plate, a lower pressing plate and a phase separation plate are added, and the upper iron yoke and the clamping piece are restored to form the transformer body.
Referring to fig. 1, distribution transformer low voltage phase line a, b, c three-phase outgoing line copper bar 3 is drawn forth from between first insulation cardboard 2 and the second insulation cardboard 4, and the insulation between folder 1 is realized after relying on first insulation cardboard 2 to keep apart on going out copper bar 3 and low pressure, and the width of first insulation board 2 is greater than the width of folder 1 on the transformer, has increaseed the creepage distance of outgoing line copper bar 3 to folder 1 on the low pressure.
The low-voltage phase lines a, b and c are isolated from the iron core 5 by the second insulating paper board 4, and the width of the second insulating paper board 4 is at least greater than the height of the two-stage iron core close to the outgoing line copper bar 3. When the silicon steel sheet of the iron core 5 deforms and protrudes to incline to the outlet copper bar 3, the second insulating plate 4 can play a good insulating and isolating role.
It should be noted that the first insulating cardboard 2 and the second insulating cardboard 4 are both in the form of electrical insulating cardboard; of course, other forms of insulating panels known in the art may also be used by those skilled in the art.
In addition, after the low-voltage phase line a, b and c three-phase outgoing copper bars 3 are led out from the low-voltage coil, the low-voltage phase line a, b and c three-phase outgoing copper bars are wrapped by 3 layers of crepe paper, moisture is removed after the crepe paper is subjected to vacuum drying treatment, and the insulating property of the transformer oil-immersed transformer is improved, so that the insulating capacity of the low-voltage phase line a, b and c three-phase outgoing copper bars 3 on the iron core 5 and the low-voltage upper clamping piece 1 is. Similarly, the first insulating paper board 2 and the second insulating paper board 4 are also subjected to vacuum drying treatment to remove moisture, and the insulating property is improved after the transformer oil is soaked.
Although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without inventive work are still within the scope of the present invention.
Claims (7)
1. The utility model provides a distribution transformer low pressure copper bar insulator arrangement that is qualified for next round of competitions which characterized in that includes: the transformer comprises a transformer low-voltage upper clamping piece, a transformer outgoing copper bar, a first insulating plate and a second insulating plate, wherein the first insulating plate is arranged between the transformer low-voltage upper clamping piece and the transformer outgoing copper bar; the width of the first insulating plate is larger than that of the lower-voltage upper clamping piece of the transformer; the width of the second insulating plate is at least larger than the height of the last two stages of iron cores close to the outgoing line copper bar.
2. The distribution transformer low-voltage outlet copper bar insulation device as claimed in claim 1, wherein the transformer outlet copper bar is wrapped by three layers of crepe paper after being led out from the low-voltage coil.
3. The distribution transformer low-voltage outlet copper bar insulation device as claimed in claim 2, wherein the crepe paper is vacuum dried and then impregnated with transformer oil.
4. The distribution transformer low-voltage outlet copper bar insulation device as claimed in claim 1, wherein the first insulation board and the second insulation board are impregnated with transformer oil after being subjected to vacuum drying treatment.
5. The distribution transformer low-voltage outlet copper bar insulation device as claimed in claim 1, wherein the head end and the tail end of the low-voltage coil are led out from the outlet copper bar and welded with the copper foil by argon arc welding.
6. The distribution transformer low-voltage outlet copper bar insulation device as claimed in claim 1, wherein the transformer core is formed by stacking silicon steel sheets, the cross section of the core is oval, and the silicon steel sheets are clamped by the high-voltage and low-voltage clamping pieces through the stay bolt after being stacked.
7. A distribution transformer, characterized in that, it comprises the distribution transformer low-voltage outlet copper bar insulation device of any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921399898.9U CN210535485U (en) | 2019-08-26 | 2019-08-26 | Distribution transformer low-voltage outlet copper bar insulation device and distribution transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921399898.9U CN210535485U (en) | 2019-08-26 | 2019-08-26 | Distribution transformer low-voltage outlet copper bar insulation device and distribution transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210535485U true CN210535485U (en) | 2020-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921399898.9U Active CN210535485U (en) | 2019-08-26 | 2019-08-26 | Distribution transformer low-voltage outlet copper bar insulation device and distribution transformer |
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| Country | Link |
|---|---|
| CN (1) | CN210535485U (en) |
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2019
- 2019-08-26 CN CN201921399898.9U patent/CN210535485U/en active Active
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