CN208256440U - A kind of dry type high frequency transformer - Google Patents
A kind of dry type high frequency transformer Download PDFInfo
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- CN208256440U CN208256440U CN201820091976.8U CN201820091976U CN208256440U CN 208256440 U CN208256440 U CN 208256440U CN 201820091976 U CN201820091976 U CN 201820091976U CN 208256440 U CN208256440 U CN 208256440U
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Abstract
本实用新型属于干式变压器技术领域，具体涉及一种绝缘性能好、局部放电量趋近于零的干式高频变压器。本实用新型通过在绕组线圈与绝缘层之间加设具有缓冲效果的过渡层，实现了绕组与绝缘层之间的良好衔接，避免了现有技术中绝缘层与绕组之间存在间隙和裂缝的现象，能够有效降低局部放电水平，并进一步的通过优选绝缘弹性材质和静电屏蔽材质作为过渡层，杜绝了高低压侧绝缘层局部放电量大的安全隐患，大大提升干式高频变压器的绝缘性能和使用寿命，提升电力电子变压器装置的长期运行可靠性。
The utility model belongs to the technical field of dry-type transformers, in particular to a dry-type high-frequency transformer with good insulation performance and close to zero partial discharge. The utility model realizes a good connection between the winding and the insulating layer by adding a transition layer with a buffer effect between the winding coil and the insulating layer, and avoids gaps and cracks between the insulating layer and the winding in the prior art phenomenon, can effectively reduce the level of partial discharge, and further optimize the insulating elastic material and electrostatic shielding material as the transition layer, eliminating the potential safety hazard of large partial discharge on the high and low voltage side insulation layer, and greatly improving the insulation performance of dry-type high-frequency transformers and service life, and improve the long-term operational reliability of the power electronic transformer device.
Description
Technical field
The utility model belongs to Dry-Transformer Technology field, and in particular to a kind of insulation performance is good, transformer is local
The small dry type high frequency transformer of discharge capacity.
Background technique
Electric power electric transformer (Power Electronic Transformer, abbreviation PET) is a kind of novel transformer,
Its conversion and control that energy is carried out by power electronic devices and Technics of Power Electronic Conversion technology.Compared to traditional transformer
Speech, electric power electric transformer volume is smaller, weight is lighter, has section material and energy-efficient advantage.Electric power electric transformer is in intelligence
It has broad application prospects in power grid, flexible access can not only be provided for microgrid, distributed energy and renewable energy
Scheme；It can also guarantee the power quality of electric system, sufficiently meet power consumer to power supply reliability, safety, flexibility
With the demand of economy；And it can be realized multiport supplied by AC/DC electricity.
High frequency transformer is the core devices of PET, mainly plays isolation, transformation and transimission power.High frequency transformer
It is made of magnetic core and the armature winding being wound on magnetic core with secondary windings, using electromagnetic induction principle, the different primary of the number of turns
Winding is different from the voltage of secondary windings, to realize the conversion of voltage.It must be using dry applied to the high frequency transformer in PET
Formula insulation technology to realize non-oil ultra high vacuum system design, to promote the global reliability of PET.Dry insulation in the prior art often leads to
Poured with epoxy resin is crossed to realize.
Chinese patent literature CN105810418A provides a kind of insulation system of high frequency transformer, by being provided with
Low, high-voltage winding concentric coiling is carried out outside the iron core of insulating layer, and among low pressure winding and high-voltage winding and high voltage winding
Casting epoxy resin insulating layer between group and shell, has obtained high voltage high frequency transformer.The technology is when preparing transformer, by ring
Oxygen resin-cast enters in reserved gap, is then solidified again.However, epoxy resin is in solidification, it may occur that certain receipts
Contracting, this is allowed for, and the interface between the different medium inside high frequency transformer is cracked and air gap, and creeping discharge occurs, thus
The decreasing insulating of dry insulation structure, transformer inner discharge amount is caused to increase；It even can be in transformer longtime running
Shi Yinqi insulation breakdown causes high and low pressure side short circuit and brings serious safety accident.
As it can be seen that the dry insulation structure being only made of in the prior art epoxy resin is not able to satisfy the length of high frequency transformer
Phase operational reliability demand.
Utility model content
The purpose of the utility model is to overcome the dry insulation structures being only made of in the prior art epoxy resin not
The problem of being able to satisfy the longtime running reliability requirement of high frequency transformer, and then a kind of high frequency with novel winding construction is provided
Dry-type transformer.
The purpose of this utility model is achieved through the following technical solutions:
A kind of dry type high frequency transformer, including, the magnetic core that is successively arranged from the inside to the outside, the first insulating layer, low pressure copper coil,
Second insulating layer, high pressure copper coil and third insulating layer, further include transition zone, and the transition zone is to be set to first insulation
Elastic insulating layer between layer and the low pressure copper coil；And/or
The transition zone is the first electrostatic screen layer being set between the low pressure copper coil and the second insulating layer；
And/or
The transition zone is the second electrostatic screen layer being set between the second insulating layer and the high pressure copper coil；
And/or
The transition zone is the third electrostatic screen layer being set between the high pressure copper coil and the third insulating layer.
First insulating layer, the second insulating layer, the third insulating layer and the transition zone are tubular knot
Structure, and concentric locking collar is set to outside the magnetic core.
Further include the 4th insulating layer, the 4th insulating layer be set to the second insulating layer and the high pressure copper coil it
Between, for enclosing the effect of fixing and supporting to the high pressure copper wire.
4th insulating layer is arranged concentrically with the high pressure copper coil.
Semiconductor varnish, and/or covering semiconductor crimped paper are coated on the outer wall of 4th insulating layer.
The elastic insulating layer is made by silicon rubber.
The electrostatic shielding materials are semiconductor crimped paper and/or semiconductor self-adhesive tape.
The material of first insulating layer is epoxy resin.
The material of the second insulating layer is epoxy resin.
The material of 4th insulating layer includes epoxy resin and reinforcing fiber.
The technical solution of the utility model has the advantages that
Dry type high frequency transformer provided by the utility model, internal partial discharge quantity is small, operation that can be steady in a long-term,
The security risk of the short circuit of high and low pressure side caused by insulation breakdown is effectively avoided, the service life of high frequency transformer is improved, to mentioning
The longtime running reliability for rising electric power electric transformer device is of great significance.The utility model passes through in coil and insulating layer
Between setting can play the transition zone of buffer function, realize between insulating layer and coil it is close be connected, effectively prevent
Existing gap and crack phenomenon between insulating layer and coil in the prior art, to successfully solve inside transformer difference material
The creeping discharge problem at interface between matter, substantially increases the longtime running reliability of high frequency transformer.The utility model provides
Winding construction, the 4th transition zone can also be added according to requirement of engineering and product demand, the 4th transition zone can be to high pressure
Coil in winding plays the role of fixing and supporting, the winding for coil of being also more convenient for.
Detailed description of the invention
It, below will be to specific embodiment party in order to illustrate more clearly of the technical solution in specific embodiment of the present invention
Attached drawing needed in formula description is briefly described, it should be apparent that, the accompanying drawings in the following description is the utility model
Some embodiments for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the schematic diagram of winding construction in dry type high frequency transformer provided by the utility model embodiment.
The reference numerals are as follows in above-mentioned attached drawing:
The first insulating layer of 1-；2- elastic insulating layer；3- low pressure copper coil；4- first screen layer；5- second insulating layer；6-
Four insulating layers；7- the second electrostatic screen layer；8- high pressure copper coil；9- third electrostatic screen layer；10- third insulating layer.
Specific embodiment:
The technical solution of the utility model is clearly and completely described below in conjunction with attached drawing, it is clear that described
Embodiment is the utility model a part of the embodiment, instead of all the embodiments.In addition, the utility model disclosed below
Technical characteristic involved in different embodiments can be combined with each other as long as they do not conflict with each other.
In the description of the present invention, it should be noted that the orientation or positional relationship of the instructions such as term "inner", "outside"
To be based on the orientation or positional relationship shown in the drawings, it is merely for convenience of describing the present invention and simplifying the description, without referring to
Show or imply that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot manage
Solution is the limitation to utility model.In addition, term " first ", " second ", " third ", " the 4th " are used for description purposes only, without
It can be interpreted as indication or suggestion relative importance.
Embodiment
Dry type high frequency transformer provided in this embodiment, structure are as shown in Figure 1.The dry type high frequency transformer includes magnetic
Core, the first insulating layer, low pressure copper coil, second insulating layer, high pressure copper coil and third insulating layer, wherein in the first insulating layer
Be additionally provided with elastic insulating layer between low pressure copper coil, between low pressure copper coil and second insulating layer, second insulating layer with
The first electrostatic screen layer, the second electrostatic are also respectively provided between high pressure copper coil between high pressure copper coil and third insulating layer
Shielded layer and third electrostatic screen layer, and the 4th insulation is additionally provided between second insulating layer and the second electrostatic screen layer
Layer.
The present embodiment uses iron core as magnetic core, the material using silicane rubber plate as elastic insulating layer, using semiconductor
Material of the crimped paper as the first, second, and third electrostatic screen layer, using epoxy resin as the first, second, and third insulation
The material of layer, using high-voltage isulation cylinder made from epoxy resin and reinforcing fiber as the 4th insulating layer, the insulating cylinder interface
It is wrapped using semiconductor crimped paper.The coil of the low pressure winding and high-voltage winding is connected to lead, the first electrostatic sheild
Cover layer ground connection.
Certainly, as a kind of alternative of the present embodiment, semiconductor can also be replaced to wrinkle using semiconductor self-adhesive tape
Line paper.And according in engineering needs and product demand high-voltage isulation cylinder can also be saved,
As a kind of preferred embodiment of the present embodiment, semiconductor varnish can also be brushed outside the high-voltage isulation cylinder and wrapped
Wrap up in semiconductor crimped paper.
Above-mentioned Fig. 1 is only the schematic diagram of the winding construction of high frequency transformer provided in this embodiment, and is not drawn into high frequency change
All components in depressor, and in actual production, the opposite winding position of the coil of low pressure winding and high-voltage winding is root
According to requirement of engineering and Product Requirement Design, Fig. 1 does not provide accurate winding.
Comparative example
This comparative example provides a kind of dry type high frequency transformer, is collectively constituted by low pressure winding and high-voltage winding, the two with
Magnetic core is arranged concentrically.It from the inside to the outside successively include insulating layer one, low pressure winding coil, insulating layer two, high-voltage winding from iron core
Coil, insulating layer three.The coil of the low pressure winding and high-voltage winding is connected to lead.
, as insulating layer one, insulating layer two and insulating layer three, made using copper foil in this comparative example using using epoxy resin
For winding coil.
Experimental example
This experimental example carries out the measurement of partial discharge quantity, measurement to the dry type high frequency transformer that embodiment and comparative example provides
Method are as follows:
The connecting terminal of all high-voltage windings in embodiment and comparative example is linked together respectively and applies voltage, and will
Low pressure winding and iron core grounding, apply it is alive rise to 18kV from 0kv, continue 30s, be then down to 13kV again, and continue
3min.The partial discharge quantity during this is measured, then will apply voltage drop and be back to 0kV, off-test.
Measurement result is as follows: the shelf depreciation testing level of the high frequency transformer in comparative example is 1781pc, and embodiment
The shelf depreciation test result of provided high frequency transformer is 21.21pc, under this test condition, the shelf depreciation of testing background
Amount is 20pc, it is seen then that using the partial discharge quantity of background as blank control, then high frequency transformation provided by embodiment in the application
Device shelf depreciation levels off to 0, and insulation effect is greatly improved.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes among still in the protection scope of the utility model.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820091976.8U CN208256440U (en) | 2018-01-19 | 2018-01-19 | A kind of dry type high frequency transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820091976.8U CN208256440U (en) | 2018-01-19 | 2018-01-19 | A kind of dry type high frequency transformer |
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| Publication Number | Publication Date |
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| CN208256440U true CN208256440U (en) | 2018-12-18 |
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| CN201820091976.8U Active CN208256440U (en) | 2018-01-19 | 2018-01-19 | A kind of dry type high frequency transformer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111696763A (en) * | 2020-06-08 | 2020-09-22 | 保定天威保变电气股份有限公司 | Transformer winding middle leakage magnetic field shielding structure and method |
| CN111933423A (en) * | 2020-07-21 | 2020-11-13 | 山东电工电气集团智能电气有限公司 | Body structure of single-phase direct-buried dry-type transformer |
| CN113593856A (en) * | 2021-06-10 | 2021-11-02 | 广州市一变电气设备有限公司 | Low partial discharge's dry-type transformer |
-
2018
- 2018-01-19 CN CN201820091976.8U patent/CN208256440U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111696763A (en) * | 2020-06-08 | 2020-09-22 | 保定天威保变电气股份有限公司 | Transformer winding middle leakage magnetic field shielding structure and method |
| CN111696763B (en) * | 2020-06-08 | 2024-05-24 | 保定天威保变电气股份有限公司 | A transformer winding middle leakage magnetic field shielding structure and method |
| CN111933423A (en) * | 2020-07-21 | 2020-11-13 | 山东电工电气集团智能电气有限公司 | Body structure of single-phase direct-buried dry-type transformer |
| CN113593856A (en) * | 2021-06-10 | 2021-11-02 | 广州市一变电气设备有限公司 | Low partial discharge's dry-type transformer |
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