CN111599580A - Medium-voltage high-frequency transformer applied to power electronic transformer - Google Patents

Medium-voltage high-frequency transformer applied to power electronic transformer Download PDF

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Publication number
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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CN
China
Prior art keywords
voltage
voltage winding
low
iron core
transformer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010337065.0A
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Chinese (zh)
Inventor
范建华
徐鹏飞
韩长忠
于晓强
肖汝腾
王庆园
谢堂林
李鸿儒
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Topscomm Communication Co Ltd
Original Assignee
Qingdao Topscomm Communication Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qingdao Topscomm Communication Co Ltd filed Critical Qingdao Topscomm Communication Co Ltd
Priority to CN202010337065.0A priority Critical patent/CN111599580A/en
Publication of CN111599580A publication Critical patent/CN111599580A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/28Coils; Windings; Conductive connections
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/28Coils; Windings; Conductive connections
    • H01F27/32Insulating of coils, windings, or parts thereof
    • H01F27/327Encapsulating or impregnating
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/40Structural association with built-in electric component, e.g. fuse
    • H01F27/402Association of measuring or protective means

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

Medium-voltage high-frequency transformer applied to power electronic transformer
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.
CN202010337065.0A 2020-04-26 2020-04-26 Medium-voltage high-frequency transformer applied to power electronic transformer Pending CN111599580A (en)

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

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010337065.0A Pending 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 (1)

* Cited by examiner, † Cited by third party
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

Citations (4)

* Cited by examiner, † Cited by third party
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
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 (1)

* Cited by examiner, † Cited by third party
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

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