CN112420351B - High-voltage winding of ultrahigh-voltage high-capacity phase-shifting transformer and winding method - Google Patents
High-voltage winding of ultrahigh-voltage high-capacity phase-shifting transformer and winding method Download PDFInfo
- Publication number
- CN112420351B CN112420351B CN202011185894.8A CN202011185894A CN112420351B CN 112420351 B CN112420351 B CN 112420351B CN 202011185894 A CN202011185894 A CN 202011185894A CN 112420351 B CN112420351 B CN 112420351B
- Authority
- CN
- China
- Prior art keywords
- winding
- coil
- wire
- turns
- voltage
- 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.)
- Active
Links
Images
Classifications
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/06—Coil winding
Abstract
The invention relates to a high-voltage winding of an ultrahigh-voltage high-capacity phase-shifting transformer and a winding method, belonging to the technical field of transformer manufacturing. The technical scheme is as follows: the winding is a cake winding and is respectively provided with an outlet wire at the upper end part and an outlet wire at the lower end part; the winding is divided into three sections in the axial direction: the winding sections are respectively the end winding sections positioned at the wire inlet end and the wire outlet end, and the middle winding section positioned in the middle; the end part winding sections positioned at the wire inlet end and the wire outlet end are wound in parallel by 2n (n is an integer and is more than or equal to 1) axial combined conducting wires (4), and the axial combined conducting wires are of two wire-to-wire combined structures in the axial direction; an inter-coil oil duct (2) is arranged between each section of coil cake of the end winding, each section of coil cake is provided with a plurality of coil turns, a plurality of coil turns are in a group, and an inter-coil oil duct (3) is arranged between the coil turns. The invention has the beneficial effects that: the longitudinal capacitance of the whole coil is improved; therefore, the impact distribution of the winding under the lightning overvoltage is improved, the longitudinal insulation design of the winding is optimized, and the safety and reliability of product operation are improved.
Description
Technical Field
The invention relates to a high-voltage winding of an ultrahigh-voltage high-capacity phase-shifting transformer and a winding method, belonging to the technical field of transformer manufacturing.
Background
The phase-shifting transformer with ultrahigh voltage and large capacity has a bottleneck which is difficult to break through if the conventional design is adopted because a high-voltage terminal needs to bear ultrahigh voltage and large current of 500kV or more. The ultra-high voltage means that the high voltage winding of the transformer will meet the insulation level requirements for ultra-high voltage, and the winding insulation must be able to withstand without damage the inrush voltage intrusion of lightning full waves, chops, etc. at this insulation level. The distribution of the invading overvoltage shock wave on the winding can be improved by changing the structural form of the transformer winding, thereby reducing the potential gradient among the wire cakes and meeting the requirement of the longitudinal insulation strength of the winding. The prior art is generally designed to achieve the goal of improving the surge voltage distribution by using an inner shield-continuous winding structure or a kink-continuous winding structure. The primary side and the secondary side of the large-capacity phase-shifting transformer have the same insulation level, and because the capacity is very large, if the phase-shifting angle requirement value is not large, the voltage difference between the terminal of the winding and the center point is small, and the number of turns of the high-voltage winding is small at the moment. If an internal shielding-continuous winding structure is adopted, in order to increase the longitudinal capacitance of the winding, shielding wires are arranged between the radial parallel working wires and between turns of the winding, the number of the shielding wires is the same as that of the working wires, and the shielding wires and the radial parallel working wires are arranged in a staggered mode. Therefore, the filling factor of the internal shielding-continuous winding structure is small, the increase of the longitudinal capacitance of the winding converted by sacrificing the filling factor is not very obvious, and the technical economy is very poor. If a winding structure of a kink-transposition type is adopted, the traditional kink mode is only to arrange turns in a staggered manner in the radial direction so as to improve the voltage between the turns of adjacent lines and increase the electric field energy stored between the turns, thereby improving the equivalent capacitance of a kink unit and increasing the series capacitance of the winding. However, the traditional entanglement arrangement structure is too simple, only the capacitance can be increased from the radial line turn-to-turn, and the longitudinal capacitance increase of the whole winding is not obvious. Because the winding of the large-capacity transformer passes large current, in order to reduce the eddy current loss of the winding wire and improve the requirement of short-circuit resistance, a multi-core self-adhesion transposed conductor is usually adopted for winding, because the width of a single wire of the winding formed by winding the transposed conductor is small, the turn-to-turn geometric capacitance of the winding is very small, and in order to meet the heat dissipation requirement, the turn-to-turn oil duct is inserted between turns of the large-capacity phase-shifting transformer, so that the winding is more difficult to ensure to have enough longitudinal capacitance.
Disclosure of Invention
The invention aims to provide a high-voltage winding and a winding method of an ultrahigh-voltage and high-capacity phase-shifting transformer, which utilize the characteristics of axial combined lines and a plurality of parallel windings, adopt a mode of cross interconnection of a plurality of wires in the axial direction and the radial direction, increase the turn difference between radial line turns and axial line turns together, and increase the electric field energy stored between the turns in two dimensions of the axial direction and the radial direction so as to improve the integral longitudinal capacitance of a coil; therefore, the impact distribution of the winding under the lightning overvoltage is improved, the longitudinal insulation design of the winding is optimized, the safe reliability of product operation is improved, and the problems in the background art are solved.
The technical scheme of the invention is as follows:
a high-voltage winding of an ultrahigh-voltage high-capacity phase-shifting transformer is a cake-shaped winding and is respectively led out at the upper end part and the lower end part; the winding is divided into three sections in the axial direction: the winding sections are respectively the end winding sections positioned at the wire inlet end and the wire outlet end, and the middle winding section positioned in the middle; the end part winding section positioned at the wire inlet end and the wire outlet end is formed by winding 2n (n is an integer and is more than or equal to 1) axial combined wires in parallel, and the axial combined wires are of a two-wire combined structure in the axial direction; an inter-coil oil duct is arranged between each section of coil cake of the end winding, each section of coil cake is provided with a plurality of coil turns, a plurality of turns form a group, and an inter-coil oil duct is arranged between the coil turns.
The middle winding section of the winding is formed by winding a common lead in a continuous structure. The middle winding section of the winding can also be wound by adopting the winding mode of the invention
A high-voltage winding method of ultra-high voltage, high-capacity phase-shifting transformer, the end winding section of the winding is divided into two lines after the end is imported wire, connect a wire in every axial combination wire separately, these n wires are connected in parallel in the radial and axial stagger; after m (m is an integer and is more than or equal to 2) turns are wound on a first coil cake of a winding unit, cross transposition is carried out from the inner diameter side of the winding to a next coil cake, after m turns are wound along the coil cake winding direction, the cross transposition is carried out from the outer diameter side of the winding and then is connected with n conducting wires left after the wires are taken from the axial combined conducting wires in the previous coil cake, the n conducting wires are wound in the first coil cake for m turns to the inner diameter side for cross transposition and then are connected to the next coil cake, and then m turns are wound along the positive coil cake and then are connected to the wire outlet end of the unit in parallel; by the aid of the cross winding method, the number difference between each wire and the adjacent wire in the axial direction and the radial direction is increased to 2m, longitudinal capacitance of the winding is greatly increased, impact distribution of the winding under lightning overvoltage is improved, longitudinal insulation design of the winding is optimized, and safety and reliability of product operation are improved.
The invention is a cake structure, there are oil ducts between cakes and oil ducts between turns in the cake, several sections of cakes at the head and end of the winding are made of axial combined wires and wound by applying the cross transposition method, each turn of wire has larger turn number difference with adjacent turn of wire in axial and radial directions to increase the longitudinal capacitance of the whole winding, thus improving the impact distribution of the winding under lightning overvoltage. The wire cake of the winding in the middle part can be replaced by a common wire to be wound in a continuous winding structure according to requirements.
The invention has the beneficial effects that: by utilizing the characteristics of axial combined lines and a plurality of parallel winding, a plurality of lead wires are adopted in the axial direction and the radial direction in a cross interconnection mode, the turn number difference between radial line turns and axial line turns is increased together, and the electric field energy stored between the turns is increased from the two dimensions of the axial direction and the radial direction, so that the integral longitudinal capacitance of the coil is improved; therefore, the impact distribution of the winding under the lightning overvoltage is improved, the longitudinal insulation design of the winding is optimized, and the safety and reliability of product operation are improved.
Drawings
FIG. 1 is a general block diagram of a high voltage winding according to an embodiment of the present invention;
FIG. 2 is a block diagram of an end winding segment according to an embodiment of the present invention;
in the figure: the structure comprises a stay 1, an inter-coil oil duct 2, an inter-turn oil duct 3, an axial combined wire 4, a winding head end 5, a winding tail end 6, an outer diameter side cross transposition 7, a unit wire outlet end 8, a coil winding direction 9, an inner diameter side cross transposition 10, a coil number 11 of a winding unit, a unit wire inlet end 12, a coil number 13 and an inter-coil oil duct 14.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings.
A high-voltage winding of an ultrahigh-voltage high-capacity phase-shifting transformer is a cake-shaped winding and is respectively led out at the upper end part and the lower end part; the winding is divided into three sections in the axial direction: the winding sections are respectively the end winding sections positioned at the wire inlet end and the wire outlet end, and the middle winding section positioned in the middle; the end part winding section positioned at the wire inlet end and the wire outlet end is formed by winding 2n (n is an integer and is more than or equal to 1) axial combined wires 4 in parallel, and the axial combined wires 4 are of a two-wire combined structure in the axial direction; an inter-coil oil duct 2 is arranged between each section of coil cake of the end winding, each section of coil cake is provided with a plurality of coil turns, a plurality of coil turns are in a group, and an inter-coil oil duct 3 is arranged between the coil turns.
The middle winding section of the winding is formed by winding a common lead in a continuous structure.
A high-voltage winding method of the ultra-high voltage, high-capacity phase-shifting transformer, the end winding section of the winding is divided into two lines and connects a wire in every axial combination wire 4 separately after the end is imported wire, these n wires are connected in parallel in the radial and axial direction alternately; after m (m is an integer and is more than or equal to 2) turns are wound on a first coil of a winding unit, cross transposition is carried out from the inner diameter side of the winding 10 to the next coil, after m turns are wound along a coil winding direction 9 positive coil, the cross transposition is carried out from the outer diameter side 7 of the winding and is connected with n conducting wires left after the wires are taken from the axial combined conducting wires in the previous coil, the n conducting wires are wound in the first coil for m turns to the inner diameter side for cross transposition and then to the next coil, and then m turns are wound along the positive coil and are connected to a wire outlet end 8 of the unit in parallel; by the aid of the cross winding method, the number difference between each wire and the adjacent wire in the axial direction and the radial direction is increased to 2m, longitudinal capacitance of the winding is greatly increased, impact distribution of the winding under lightning overvoltage is improved, longitudinal insulation design of the winding is optimized, and safety and reliability of product operation are improved.
In the embodiment shown in fig. 1, the winding is a multi-segment pancake winding wound in the axial direction along the bar 1. The whole winding section is divided into three intervals: the end winding section adopting the invention is positioned at the wire inlet end and the wire outlet end, and the middle part is a common middle winding section. The upper end of the winding is a winding head end 5, and the lower end is a winding tail end 6. The end winding section is wound by an axial combined conducting wire 4, and the axial combined conducting wire is in a two-wire combined structure in the axial direction. An inter-coil oil passage 2 is arranged between each section of coil cake of the winding, each section of coil cake is provided with a plurality of coil turns, a plurality of turns form a group, and an inter-coil oil passage 3 is arranged between the turns.
Fig. 2 is a unit structure of the end winding segment of the present invention. The four-wire parallel connection is taken as an example to explain, m turns of each coil are taken as an example, the winding is wound by four axial combined conducting wires in parallel, the four axial combined conducting wires are respectively taken from one conducting wire of the axial combined conducting wires of each two-wire combined structure, and the coil number of the winding unit is 11: the four conductors taken out are interleaved and connected to the incoming line end 12 of the unit. After m turns are wound at the serial number I of a coil cake at the outlet end 8 of a winding unit, conducting wires are crossed and transposed from 10 to the next coil cake with the serial number II at the inner diameter side of the winding, then m turns are wound along the positive coil winding direction 9, then the conducting wires are connected with the four conducting wires left after taking wires from the axial combined conducting wires in the coil cake with the serial number I after being crossed and transposed at the outer diameter side 7 of the winding, the four conducting wires are wound to the coil cake with the serial number II after being crossed and transposed from m turns to the inner diameter side in the coil cake with the serial number I, and then the positive coil is wound with m turns and then is connected to the outlet end 8 of the unit in parallel. An inter-coil oil duct 14 is arranged between each section of coil cake of the winding, each section of coil cake is provided with a plurality of coil turns, a plurality of turns form a group, and an inter-coil oil duct is arranged between the turns.
Claims (1)
1. A high-voltage winding method of an ultrahigh-voltage high-capacity phase-shifting transformer is characterized by comprising the following steps: after the wire is fed into the end part of the winding, the winding section at the end part of the winding is divided into two rows which are respectively connected with one conducting wire in each axial combined conducting wire (4), and the n conducting wires are connected in parallel in a staggered mode in the radial direction and the axial direction; after m turns are wound on a first coil of a winding unit, m is an integer and is more than or equal to 2, the inner diameter side of the winding is subjected to cross transposition (10) to the next coil, m turns are wound along a positive coil in the coil winding direction (9), the m turns are wound from the outer diameter side of the winding after being subjected to cross transposition (7), the m turns are connected with n leads left after the axial combined lead in the previous coil is taken, the n leads are wound in the first coil for m turns to the inner diameter side for cross transposition to the next coil, and the m turns are wound along the positive coil and then connected to a lead-out end (8) of the unit in parallel; by the aid of the cross winding method, the number difference between each wire and the adjacent wire in the axial direction and the radial direction is increased to 2m, longitudinal capacitance of the winding is greatly increased, and impact distribution of the winding under lightning overvoltage is improved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011185894.8A CN112420351B (en) | 2020-10-30 | 2020-10-30 | High-voltage winding of ultrahigh-voltage high-capacity phase-shifting transformer and winding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011185894.8A CN112420351B (en) | 2020-10-30 | 2020-10-30 | High-voltage winding of ultrahigh-voltage high-capacity phase-shifting transformer and winding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112420351A CN112420351A (en) | 2021-02-26 |
| CN112420351B true CN112420351B (en) | 2021-08-27 |
Family
ID=74828202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011185894.8A Active CN112420351B (en) | 2020-10-30 | 2020-10-30 | High-voltage winding of ultrahigh-voltage high-capacity phase-shifting transformer and winding method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112420351B (en) |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2066613U (en) * | 1990-06-15 | 1990-11-28 | 沈阳变压器厂 | 35kv winding structure for transformer |
| CN1776840A (en) * | 2005-12-13 | 2006-05-24 | 中电电气集团有限公司 | Layer-type coil-replacement method of radial-direction multiple-parallel-wound coil |
| CN201549335U (en) * | 2009-10-29 | 2010-08-11 | 泰安泰山电气有限公司 | Voltage regulation coil of transformer |
| CN201562557U (en) * | 2009-11-05 | 2010-08-25 | 保定天威集团有限公司 | Coil interturn oil passage |
| CN102169750B (en) * | 2011-01-31 | 2013-01-16 | 江苏天翔节能科技有限公司 | Coil winding of transformer |
| CN104036932A (en) * | 2014-07-03 | 2014-09-10 | 江苏亨特集团华特电气有限公司 | Novel dry type transformer for solar photovoltaic power generation |
| CN204614626U (en) * | 2015-05-19 | 2015-09-02 | 沈阳飞驰电气设备有限公司 | The two cake foil formulas of photovoltaic power generation transformer low pressure two division coil |
| CN107808760A (en) * | 2017-12-12 | 2018-03-16 | 保定天威集团特变电气有限公司 | Quadripartion combined transformer |
| CN111128529A (en) * | 2019-12-24 | 2020-05-08 | 保定天威保变电气股份有限公司 | Dual-continuous-correction type net side winding structure of UPFC engineering series transformer |
-
2020
- 2020-10-30 CN CN202011185894.8A patent/CN112420351B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112420351A (en) | 2021-02-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3528046A (en) | Interlaced disk winding with improved impulse voltage gradient | |
| CN202736630U (en) | Hollow split electric reactor | |
| CN101620931A (en) | Method for winding transposition wire of double-single spiral coil | |
| CN112420351B (en) | High-voltage winding of ultrahigh-voltage high-capacity phase-shifting transformer and winding method | |
| CN217086341U (en) | Improved 35KV power transformer high-voltage cake type coil structure | |
| CN101651020B (en) | Wire and foil mixedly winding coil grounding transformer | |
| CN101719416B (en) | U-shaped current transformer with on-line insulation-monitoring function | |
| CN201765932U (en) | Single-phase traction transformer for three-phase VX connection of AT power supply mode | |
| CN211294840U (en) | Continuous winding of power transformer and power transformer | |
| US3766504A (en) | Interleaved transformer winding having three parallel connected conductors | |
| CN219658521U (en) | Parallel wire winding structure of transformer coil | |
| CN112420350B (en) | Winding structure and winding method for end part of high-voltage winding of phase-shifting transformer | |
| CN204596598U (en) | A kind of transformer with continuous high pressure winding | |
| CN108987069B (en) | Electromagnetic voltage transformer | |
| CN109817424B (en) | Arc suppression coil winding method and arc suppression coil using same | |
| CN212230219U (en) | Cake-type coil capable of eliminating local bulge and reducing insulation distance | |
| CN106653314B (en) | A kind of double cake-type winding structures | |
| CN210606920U (en) | High-voltage dry-type air reactor | |
| CN219979305U (en) | U-shaped winding structure of high-capacity transformer | |
| CN111933431B (en) | Axial split type transformer coil structure, low-voltage coil leading-out structure and transformer | |
| CN219575358U (en) | Large-scale transformer low-voltage coil head leading-out structure | |
| CN217588649U (en) | Coil structure of high pressure regulating integral type neutral point pressure regulating | |
| CN116504511A (en) | SCOTT transformer M becomes 4U type high tension winding structure | |
| CN211957393U (en) | Hollow reactor with cake-type winding | |
| CN116403815B (en) | Dry-type hollow shunt reactor for ultrahigh voltage and extra-high voltage and implementation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |