CN111599580A - Medium-voltage high-frequency transformer applied to power electronic transformer - Google Patents
Medium-voltage high-frequency transformer applied to power electronic transformer Download PDFInfo
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- CN111599580A CN111599580A CN202010337065.0A CN202010337065A CN111599580A CN 111599580 A CN111599580 A CN 111599580A CN 202010337065 A CN202010337065 A CN 202010337065A CN 111599580 A CN111599580 A CN 111599580A
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- iron core
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- 238000004804 winding Methods 0.000 claims abstract description 39
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 9
- 239000003822 epoxy resin Substances 0.000 claims abstract description 7
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 7
- 239000004020 conductor Substances 0.000 claims abstract description 5
- 238000004382 potting Methods 0.000 claims description 7
- 238000005266 casting Methods 0.000 claims description 2
- 230000005684 electric field Effects 0.000 claims description 2
- 238000005538 encapsulation Methods 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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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
- H01F27/28—Coils; Windings; Conductive connections
-
- 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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/327—Encapsulating or impregnating
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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
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Regulation Of General Use Transformers (AREA)
Abstract
The invention discloses a medium-voltage high-frequency transformer applied to a power electronic transformer, which comprises a high-voltage winding, a low-voltage winding and an iron core, wherein the low-voltage winding and the iron core are mutually insulated, the low-voltage winding is uniformly wound on the iron core, the low-voltage winding and the iron core are integrally coated by a semi-conductive material to form a shielding layer, the shielding layer is grounded, the low-voltage winding and the iron core are cast by epoxy resin or other heat-conducting insulating encapsulating materials to form an encapsulation body, the high-voltage winding is uniformly wound on the encapsulation body, and the high-voltage winding, the low-voltage winding and the iron core are integrally cast by. The invention is applied to a power electronic transformer and solves the problem that the transformer in the prior art cannot meet the requirements of voltage resistance and partial discharge.
Description
Technical Field
The invention belongs to the field of power systems, and particularly relates to a medium-voltage high-frequency transformer applied to a power electronic transformer.
Background
The traditional transformer has the defects of large volume and weight, high no-load loss, easy waveform distortion, failure isolation and the like, and along with the rapid development of emerging power grid technologies such as smart power grids and energy routing, the traditional transformer cannot meet the requirement of building strong smart power grids in China. As novel distribution equipment, the power electronic transformer can overcome the defects of the traditional transformer, realize multiple functions of transformation, electrical isolation, power regulation, control and the like, and meet the requirement of building a smart power grid.
Power electronic transformers usually use a modular cascade topology, so that the module located near one end of the medium voltage network has a high potential, and when the power electronic switching device is turned on, the high voltage side of the high frequency transformer also has a high potential, so that good insulation performance from the low voltage side is required, and at present, no high voltage-resistant high frequency transformer exists.
In addition, the high-voltage side of the power electronic transformer is not electrically connected with the iron core of the high-frequency transformer, so that a suspension potential is generated, a partial discharge phenomenon is caused, an insulating medium is damaged in severe cases, and the safety of personnel and equipment is harmed.
Disclosure of Invention
In order to solve the above problems, the present invention provides a medium voltage high frequency transformer applied to a power electronic transformer.
The technical scheme of the invention is as follows:
a medium-voltage high-frequency transformer applied to a power electronic transformer comprises a high-voltage winding, a low-voltage winding and an iron core, wherein the low-voltage winding and the iron core are mutually insulated, the low-voltage winding is uniformly wound on the iron core, the low-voltage winding and the iron core are integrally coated by a semi-conductive material to form a shielding layer, the shielding layer is grounded, and the low-voltage winding and the iron core are poured by epoxy resin or other heat-conducting insulating encapsulating materials to form a pouring body; the high-voltage winding is uniformly wound on a casting body formed by the low-voltage winding and the iron core, and the high-voltage winding, the low-voltage winding and the iron core are integrally cast by using epoxy resin or other heat-conducting insulating potting materials.
Preferably, the shielding layer grounding can form a uniform electric field between the high-voltage winding and the low-voltage winding of the high-frequency transformer, and the partial discharge value of the high-frequency transformer is reduced.
Preferably, the heat-conducting insulating potting material is used for improving the insulating strength of the high-frequency transformer and improving the voltage-resistant level of the high-frequency transformer.
The invention has the beneficial effects that: the low-voltage winding and the outer side of the iron core are coated with the semi-conductive material shielding layer, and the shielding layer is grounded, so that the iron core can be prevented from generating a suspension potential, and the partial discharge phenomenon of the high-frequency transformer can be effectively inhibited. The high-voltage winding, the low-voltage winding and the iron core are integrally poured by using epoxy resin or other similar heat-conducting insulating potting materials, so that the voltage-resistant level of the high-frequency transformer is improved, and the safety of the power electronic transformer is improved.
Drawings
Fig. 1 is a topology diagram of a power electronic transformer.
FIG. 2 is a series topology of AC/DC modules and DC/DC modules.
Fig. 3 is a schematic structural diagram of the present invention.
Detailed Description
A power electronic transformer generally adopts a mode of module series connection voltage division to improve the voltage withstanding level of equipment, fig. 1 is a typical topology of the power electronic transformer, and a module located at one end close to a medium-voltage power grid has a high potential, so that when a power electronic switching device is switched on, the high-voltage side of a high-frequency transformer connected with the switching device also has the high potential, and the high voltage withstanding needs to be considered when the high-frequency transformer is designed; in addition, the high-voltage side of the power electronic transformer is not electrically connected with the iron core of the high-frequency transformer, so that a suspension potential is generated, a partial discharge phenomenon is caused, an insulating medium is damaged in severe cases, and the safety of personnel and equipment is harmed.
Fig. 2 is a topological diagram of the series connection of the AC/DC module and the DC/DC module, the topology has three-stage conversion, the medium-voltage power-frequency alternating current voltage is rectified by the first-stage AC/DC converter, isolated and transformed by the second-stage DC/DC converter, and finally converted into alternating current with required voltage and frequency by the third-stage DC/AC converter.
The existing high-frequency transformer has low voltage-resistant grade, and cannot meet the requirements of system voltage resistance and partial discharge or meet the requirements of voltage resistance and partial discharge on the premise of larger size.
According to the invention, the high-frequency transformer of the power electronic transformer is optimally designed, as shown in fig. 3, the low-voltage winding and the iron core of the high-frequency transformer are mutually insulated and are wholly coated by a semi-conductive material to form a shielding layer, and the shielding layer is grounded, so that the local discharge value between the high voltage and the low voltage of the high-frequency transformer is effectively reduced.
The high-voltage winding, the low-voltage winding and the iron core are integrally poured by using epoxy resin or other similar heat-conducting insulating potting materials, so that the voltage-resistant level of the high-frequency transformer is improved, and the safety of the power electronic transformer is improved.
In the above embodiment, a typical topology of the power electronic transformer is adopted, and as another embodiment, other power electronic transformer topologies that cover a modular structure of the high-frequency transformer may also be adopted.
In the above embodiments, the high-frequency transformer according to the present invention is applied to the field of power systems, and may be applied to the field of ac/dc distribution networks and power electronics as other embodiments.
In the above embodiments, the transformer of the present invention is applied to a high frequency transformer, and as another embodiment, it may be applied to a medium frequency transformer and a low frequency transformer.
The specific embodiments are given above, but the present invention is not limited to the above-described embodiments. The basic idea of the present invention is similar to the above basic scheme, and it is obvious to those skilled in the art that the design of various modified models, formulas and parameters according to the guidance of the present invention does not require creative labor. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
Claims (3)
1. A medium-voltage high-frequency transformer applied to a power electronic transformer is characterized by comprising a high-voltage winding, a low-voltage winding and an iron core, wherein the low-voltage winding and the iron core are mutually insulated, the low-voltage winding is uniformly wound on the iron core, the low-voltage winding and the iron core are integrally coated by a semi-conductive material to form a shielding layer, the shielding layer is grounded, and the low-voltage winding and the iron core are poured by epoxy resin or other heat-conducting insulating potting materials to form a pouring body; the high-voltage winding is uniformly wound on a casting body formed by the low-voltage winding and the iron core, and the high-voltage winding, the low-voltage winding and the iron core are integrally cast by using epoxy resin or other heat-conducting insulating potting materials.
2. The medium-voltage high-frequency transformer applied to the power electronic transformer is characterized in that the shielding layer is grounded, so that a uniform electric field can be formed between a high-voltage winding and a low-voltage winding of the high-frequency transformer, and the local discharge value of the high-frequency transformer is reduced.
3. The medium voltage high frequency transformer applied to the power electronic transformer as claimed in claim 1, wherein the heat conducting and insulating potting material is used for improving the insulating strength of the high frequency transformer and the voltage resistance level of the high frequency transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010337065.0A CN111599580A (en) | 2020-04-26 | 2020-04-26 | Medium-voltage high-frequency transformer applied to power electronic transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010337065.0A CN111599580A (en) | 2020-04-26 | 2020-04-26 | Medium-voltage high-frequency transformer applied to power electronic transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111599580A true CN111599580A (en) | 2020-08-28 |
Family
ID=72190609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010337065.0A Withdrawn CN111599580A (en) | 2020-04-26 | 2020-04-26 | Medium-voltage high-frequency transformer applied to power electronic transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111599580A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112885587A (en) * | 2021-01-11 | 2021-06-01 | 上海置信智能电气有限公司 | Be applied to single-phase intermediate frequency transformer of power electronic transformer |
| CN113364244A (en) * | 2021-06-17 | 2021-09-07 | 台达电子企业管理（上海）有限公司 | Isolated converter power module |
| CN113724964A (en) * | 2021-07-21 | 2021-11-30 | 华为数字能源技术有限公司 | Transformer and insulation packaging method thereof |
| CN114696564A (en) * | 2020-12-30 | 2022-07-01 | 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） | Suspension propulsion integrated module |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664094A (en) * | 2012-05-23 | 2012-09-12 | 天津天能变压器有限公司 | Single-phase dry type converter transformer for suppressing polysilicon and voltage regulation way thereof |
| CN203377069U (en) * | 2013-07-09 | 2014-01-01 | 国家电网公司 | Coil of rolled iron core transformer |
| CN105097252A (en) * | 2015-09-16 | 2015-11-25 | 浙江江山变压器股份有限公司 | Isolation transformer capable of suppressing power interference for partial discharge test of dry-type transformer |
| CN106328359A (en) * | 2016-08-31 | 2017-01-11 | 刘连营 | Primary winding bobbin, production method thereof and voltage transformer manufacturing method |
-
2020
- 2020-04-26 CN CN202010337065.0A patent/CN111599580A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664094A (en) * | 2012-05-23 | 2012-09-12 | 天津天能变压器有限公司 | Single-phase dry type converter transformer for suppressing polysilicon and voltage regulation way thereof |
| CN203377069U (en) * | 2013-07-09 | 2014-01-01 | 国家电网公司 | Coil of rolled iron core transformer |
| CN105097252A (en) * | 2015-09-16 | 2015-11-25 | 浙江江山变压器股份有限公司 | Isolation transformer capable of suppressing power interference for partial discharge test of dry-type transformer |
| CN106328359A (en) * | 2016-08-31 | 2017-01-11 | 刘连营 | Primary winding bobbin, production method thereof and voltage transformer manufacturing method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114696564A (en) * | 2020-12-30 | 2022-07-01 | 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） | Suspension propulsion integrated module |
| CN112885587A (en) * | 2021-01-11 | 2021-06-01 | 上海置信智能电气有限公司 | Be applied to single-phase intermediate frequency transformer of power electronic transformer |
| CN113364244A (en) * | 2021-06-17 | 2021-09-07 | 台达电子企业管理（上海）有限公司 | Isolated converter power module |
| CN113724964A (en) * | 2021-07-21 | 2021-11-30 | 华为数字能源技术有限公司 | Transformer and insulation packaging method thereof |
| CN113724964B (en) * | 2021-07-21 | 2023-11-03 | 华为数字能源技术有限公司 | A transformer and an insulation packaging method for the transformer |
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Application publication date: 20200828 |