CN102682977B - A kind of ultra high voltage 1000kV step-down 220kV transformer - Google Patents
A kind of ultra high voltage 1000kV step-down 220kV transformer Download PDFInfo
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- CN102682977B CN102682977B CN201210115952.9A CN201210115952A CN102682977B CN 102682977 B CN102682977 B CN 102682977B CN 201210115952 A CN201210115952 A CN 201210115952A CN 102682977 B CN102682977 B CN 102682977B
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Abstract
The present invention relates to a kind of ultra high voltage 1000kV step-down 220kV transformer, it is characterized in that, adopt single-phase monomer structure, described transformer core adopts single-phase four post two stem structures, described transformer two stems and an other column sleeve coil, described transformer each stem 1/2 capacity, outwards low pressure is followed successively by by iron core, medium and high pressure coil, the high pressure of two posts, middle pressure, low-voltage coil is all in parallel, the other post of described transformer core one is outwards followed successively by excitatory and voltage regulation coil by iron core, voltage regulation coil is by the pressure regulation of low-voltage coil excitation, connect without the linear tap changer of excitation.Transformer of the present invention easily by 220kV system access ultra high voltage backbone network, can save electric grid investment; Optimize 1000kV step-down 220kV design of transformer, improve the reliability of ultra high voltage backbone network; Realize 1000kV system to be connected with 220kV system, reduce and take up an area, reduce the wastage raising power transmission efficiency.
Description
Technical field
The present invention relates to a kind of ultra high voltage step-down transformer, particularly ultra high voltage 1000kV step-down 220kV transformer, belongs to electrical equipment technical field.
Background technology
Electricity Demand maintains sustained and rapid growth, energy resources skewness, needs the ability promoting electrical network and optimize the configuration of resources badly on a large scale, and development UHV transmission is the necessary means meeting this objective demand.Along with 2008 the end of the year southeast Shanxi-Nanyang-Jingmen UHVAC demonstration project put into operation smoothly, 2012, China's extra-high-voltage alternating current bulk transmission grid will begin to take shape, receiving end formed connection North China-Central China-East China extra-high-voltage alternating current double loop ring network structure.The year two thousand twenty, extra-high-voltage alternating current is formed with North China, Central China, East China for core, the strong electric network composition of connection China each large regions electrical network, large coal-electricity base, greatly Hydropower Base and main loads center.
What current China southeast Shanxi-Nanyang-Jingmen UHV demonstration project adopted is 500kV system access scheme, adopt Changzhi-Jincheng double back 500kV circuit cut access southeast Shanxi ultra-high voltage transformer station at southeast Shanxi, enter bamboo hat at Jingmen ultra-high voltage transformer station 500kV side outlet 2 tieback and become.Along with the formation of China's extra-high-voltage alternating current bulk transmission grid, carry out the perspective study of ultra high voltage 1000kV step-down 220kV transformer feasibility, for the ultra high voltage 220kV that lands vertically provides technical feasibility study.Adopt ultra high voltage 1000kV step-down 220kV transformer not only easily by 220kV system access ultra high voltage backbone network, electric grid investment can be saved; And 1000kV step-down 220kV design of transformer can be optimized on existing Test and pilot project main transformer foundation, improve the reliability of ultra high voltage backbone network; Realize 1000kV system to be connected with 220kV system, reduce and take up an area, reduce the wastage raising power transmission efficiency.
From present Research both domestic and external, ultra high voltage step-down transformer both domestic and external is all 1000kV step-down 500kV so far, the Wu Bei of the Northwest and phoenix have 750kV step-down 220kV transformer to develop, capacity is respectively 334MVA and 500MVA, does not relate to the research of ultra high voltage 1000kV step-down 220kV transformer at present both at home and abroad.
The patent documentation relating to electric power reducing transformer at present has a lot, and such as application number is the utility model patent of the step-down coordination transformer of 200420098140.9, relates to the step-down coordination transformer in a kind of electric railroad drawing electric network.But the main purpose of this patent is for drawing electric network provides a kind of step-down coordination transformer, makes compensation equipment not fragile, reduce investment and the use cost of compensation equipment.Further, it does not relate to the research of ultra high voltage 1000kV step-down 220kV transformer.
In view of this, be necessary to provide a kind of ultra high voltage 1000kV step-down 220kV transformer, to meet commercial Application needs.
Summary of the invention
The object of the invention is: a kind of ultra high voltage 1000kV step-down 220kV transformer is provided, thus easily by 220kV system access ultra high voltage backbone network, electric grid investment can be saved; And 1000kV step-down 220kV design of transformer can be optimized on existing UHVAC demonstration project main transformer foundation, improve the reliability of ultra high voltage backbone network; Realize 1000kV system to be connected with 220kV system, reduce and take up an area, reduce the wastage raising power transmission efficiency.
Technical scheme of the present invention is: a kind of ultra high voltage 1000kV step-down 220kV transformer, it is characterized in that, adopt single-phase monomer structure, described transformer core adopts single-phase four post two stem structures, described transformer two stems and an other column sleeve coil, described transformer each stem 1/2 capacity, outwards low pressure is followed successively by by iron core, medium and high pressure coil, the high pressure of two posts, middle pressure, low-voltage coil is all in parallel, the other post of described transformer core one is outwards followed successively by excitatory and voltage regulation coil by iron core, voltage regulation coil is by the pressure regulation of low-voltage coil excitation, connect without the linear tap changer of excitation.
Ultra high voltage 1000kV step-down 220kV transformer as above, it is characterized in that, described Cooling Methods of Transformers is that forced oil-circulation is air-cooled; The arrangement form of cooler is wall-hanging.
Ultra high voltage 1000kV step-down 220kV transformer as above, is characterized in that, described oil tank of transformer adopts barrel type tank.
The invention has the beneficial effects as follows: ultra high voltage 1000kV step-down 220kV transformer provided by the invention is single-phase monomer structure, adopt single-phase four post two stem structures, can effectively reduce transformer height, meet highway transportation requirement; Ultra high voltage 1000kV step-down 220kV transformer of the present invention not only easily by 220kV system access ultra high voltage backbone network, can save electric grid investment; And 1000kV step-down 220kV design of transformer can be optimized on existing Test and pilot project main transformer foundation, improve the reliability of ultra high voltage backbone network; Realize 1000kV system to be connected with 220kV system, reduce and take up an area, reduce the wastage raising power transmission efficiency.
Accompanying drawing explanation
Fig. 1 is the elementary diagram of a kind of ultra high voltage 1000kV step-down 220kV transformer provided by the invention.
Fig. 2 is the floor plan of a kind of ultra high voltage 1000kV step-down 220kV transformer provided by the invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail, but this embodiment should not be construed as limitation of the present invention.
See Fig. 1, this figure is based on ultra high voltage 1000kV step-down 220kV transformer connection figure of the present invention.
Described step-down change connects into middle line ball end voltage regulating mode.
The series connection winding SV that described step-down becomes connects with common winding CV.
The following describes the implication of label in accompanying drawing 1:
A is the high-tension line exit that step-down becomes, and namely A is HV Terminal.
Am is that step-down becomes medium-voltage line exit, and namely Am is intermediate voltage terminal.
A, x are low-voltage circuit exits, and namely a and x is low-voltage terminal.
X is the service outlet of neutral point, and namely X is neutral terminal.
When voltage needs adjustment, adjusting without field switch on can being become by step-down.
Because this step-down varying capacity is large, produce loss comparatively greatly, and then it is large to produce heat, in order to more effectively reduce the temperature rise that step-down becomes, transformer adopts strong oil wind cold type cooler, chiller belt oil pump and fan.
As shown in Figure 1, a kind of ultra high voltage 1000kV step-down 220kV transformer provided by the invention, described transformer adopts single-phase monomer structure; Described transformer core adopts single-phase four post two stem structures; Described transformer two stems and an other column sleeve coil; Described transformer each stem 1/2 capacity, is outwards followed successively by low pressure, medium and high pressure coil by iron core, and the high pressure of two posts, middle pressure, low-voltage coil are all in parallel; The other post of described transformer core one is outwards followed successively by excitatory and voltage regulation coil by iron core, and voltage regulation coil, by the pressure regulation of low-voltage coil excitation, connects without the linear tap changer of excitation.
Described Cooling Methods of Transformers is forced oil-circulation air-cooled (OFAF or ODAF); As shown in Figure 2, the arrangement form of cooler is wall-hanging.
Described oil tank of transformer adopts barrel type tank.
It should be noted that, the major parameter of ultra high voltage 1000kV step-down 220kV transformer provided by the invention is:
(1) rated capacity:
The continuous rating capacity when winding average temperature rising≤65K:
High pressure winding: 500MVA
Middle pressure winding: 500MVA
Low pressure winding: 150MVA
(2) rated voltage (root mean square value):
High pressure winding: 1050/
kV
Middle pressure winding: 230/
(1 ± 2 × 2.5%) kV
Low pressure winding: 66kV
(3) connection set: Ia0i0
(4) short-circuit impedance (with high pressure winding rated capacity 500MVA for benchmark)
High pressure-middle pressure: 18%
High pressure-low pressure: 41%
Middle pressure-low pressure: 20%
(5) type of cooling: forced oil-circulation air-cooled (OFAF or ODAF)
(6) interior insulation level
(7) rated frequency: 50Hz
(8) voltage regulating mode: middle line ball end pressure regulation
(9) high-side system neutral grounding mode: neutral-point solid ground
(10) temperature limit:
Winding: the average temperature rising of 65K(resistance measurement)
Top layer oil: 55K(thermometer measure)
Coiling hotspot temperature rise: 78K(calculated value)
Metal structure and temperature rise unshakable in one's determination: 78K(calculated value)
Tank surface and structural member surface: 80K(infrared temperature measurement apparatus is measured)
(11) under rated voltage and rated frequency, 75 DEG C are converted to, efficiency when power factor is 1:
H-M(senior middle school is fully loaded with) efficiency >=99.8% under rated condition
(12) total losses (in rated voltage and rated frequency, when 75 DEG C) (no-load loss+load loss)
H-M(senior middle school is fully loaded with): 1000kW
No-load loss during (13) 100% rated voltage: 150kW
(14) partial discharge quantity
High pressure winding :≤100pC
Middle pressure winding :≤200pC
Low pressure winding :≤300pC
(15) noise level: sound pressure level is not more than 75dB [A]
The content be not described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (3)
1. a ultra high voltage 1000kV step-down 220kV transformer, it is characterized in that, adopt single-phase monomer self coupling structure, the single-phase four post two stem structures of employing unshakable in one's determination, on the other post of two stems and, cover has coil respectively, each stem capacity is 1/2 of total capacity, is outwards followed successively by low-voltage coil, intermediate voltage winding and high-tension coil by stem, and high-tension coil rated voltage is 1050/
kV, intermediate voltage winding rated voltage is 230/
(1 ± 2 × 2.5%) kV, the high-tension coil of two posts, intermediate voltage winding, low-voltage coil are all in parallel, and an other post unshakable in one's determination is outwards followed successively by excitatory and voltage regulation coil by other post, and voltage regulation coil by the pressure regulation of low-voltage coil excitation, and connects without the linear tap changer of excitation.
2. ultra high voltage 1000kV step-down 220kV transformer according to claim 1, is characterized in that, the type of cooling of described transformer is that forced oil-circulation is air-cooled; The arrangement form of cooler is wall-hanging.
3. ultra high voltage 1000kV step-down 220kV transformer according to claim 1, is characterized in that, the fuel tank of described transformer adopts barrel type tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210115952.9A CN102682977B (en) | 2012-04-19 | 2012-04-19 | A kind of ultra high voltage 1000kV step-down 220kV transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210115952.9A CN102682977B (en) | 2012-04-19 | 2012-04-19 | A kind of ultra high voltage 1000kV step-down 220kV transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102682977A CN102682977A (en) | 2012-09-19 |
| CN102682977B true CN102682977B (en) | 2015-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210115952.9A Expired - Fee Related CN102682977B (en) | 2012-04-19 | 2012-04-19 | A kind of ultra high voltage 1000kV step-down 220kV transformer |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105719799B (en) * | 2014-07-30 | 2019-01-08 | 特变电工衡阳变压器有限公司 | A kind of transformer with split winding |
| CN108242328A (en) * | 2017-11-28 | 2018-07-03 | 山东泰开变压器有限公司 | Extra-high voltage single-circuit transformer based on single-phase non-excitation pressure adjustment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB528793A (en) * | 1938-05-04 | 1940-11-07 | British Thomson Houston Co Ltd | Improvements in and relating to electric transformers |
| CN2914278Y (en) * | 2006-06-27 | 2007-06-20 | 西安西电变压器有限责任公司 | Single-phase auto-powerstat |
| CN200972819Y (en) * | 2006-11-23 | 2007-11-07 | 西安西电变压器有限责任公司 | Extra-high voltage self auto-transformer |
| CN101752068A (en) * | 2010-02-08 | 2010-06-23 | 江苏上能变压器有限公司 | 220,000V-grade auto-OLTC (on-load tap changer) |
-
2012
- 2012-04-19 CN CN201210115952.9A patent/CN102682977B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB528793A (en) * | 1938-05-04 | 1940-11-07 | British Thomson Houston Co Ltd | Improvements in and relating to electric transformers |
| CN2914278Y (en) * | 2006-06-27 | 2007-06-20 | 西安西电变压器有限责任公司 | Single-phase auto-powerstat |
| CN200972819Y (en) * | 2006-11-23 | 2007-11-07 | 西安西电变压器有限责任公司 | Extra-high voltage self auto-transformer |
| CN101752068A (en) * | 2010-02-08 | 2010-06-23 | 江苏上能变压器有限公司 | 220,000V-grade auto-OLTC (on-load tap changer) |
Non-Patent Citations (1)
| Title |
|---|
| 1000 kV交流特高压变压器关键技术研究;刘东升等;《变压器》;20100531;第47卷(第5期);第13-17页 * |
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Effective date of registration: 20151021 Address after: 100192 Beijing city Haidian District Qinghe small Camp Road No. 15 Applicant after: China Electric Power Research Institute Applicant after: Tbea Shenyang Transformer Group Co.,Ltd. Address before: 100192 Beijing city Haidian District Qinghe small Camp Road No. 15 Applicant before: China Electric Power Research Institute |
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