CN202363228U - 500kV-grade three-phase three-winding excitation-free pressure regulating high-impedance power transformer - Google Patents

500kV-grade three-phase three-winding excitation-free pressure regulating high-impedance power transformer Download PDF

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Publication number
CN202363228U
CN202363228U CN2011205265617U CN201120526561U CN202363228U CN 202363228 U CN202363228 U CN 202363228U CN 2011205265617 U CN2011205265617 U CN 2011205265617U CN 201120526561 U CN201120526561 U CN 201120526561U CN 202363228 U CN202363228 U CN 202363228U
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CN
China
Prior art keywords
winding
phase
low
transformer
excitation
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Expired - Fee Related
Application number
CN2011205265617U
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Chinese (zh)
Inventor
张庆
张建彬
谢辉
庞喆
李书芳
何丽颖
李新建
李金辉
李诗杰
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.)
TIANWEI BAOBIAN (HEFEI) TRANSFORMER CO Ltd
Baoding Tianwei Group Co Ltd
Original Assignee
TIANWEI BAOBIAN (HEFEI) TRANSFORMER CO Ltd
Baoding Tianwei Group 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.)
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Publication date
Application filed by TIANWEI BAOBIAN (HEFEI) TRANSFORMER CO Ltd, Baoding Tianwei Group Co Ltd filed Critical TIANWEI BAOBIAN (HEFEI) TRANSFORMER CO Ltd
Priority to CN2011205265617U priority Critical patent/CN202363228U/en
Application granted granted Critical
Publication of CN202363228U publication Critical patent/CN202363228U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model discloses a 500kV-grade three-phase three-winding excitation-free pressure regulating high-impedance power transformer, which comprises a three-phase five-column iron core. A low-voltage winding, a middle-voltage winding and a high-voltage winding are concentrically sleeved outside the iron core. The low-voltage winding is in series connection with an electric reactor, the voltage ratio of the transformer is (525+/-2*2.5%)/36/10.5kV, the iron core adopts a three-phase five-column structure, iron core laminations form a six-stage-stepping lap joint structure, winding circuits are connected with a excitation-free pressure regulating switch, the excitation-free pressure regulating switch adopts a three-phase integrated structure and is placed at the end of a transformer oil tank, the low-voltage winding is in series connection with an electric reactor winding to increase short circuit impedance between high-low and middle-low of the transformer. The low-voltage winding, the middle-voltage winding and the high-voltage winding are concentrically sleeved outside the iron core so that the leakage magnetic flux can be effectively reduced, stray losses in windings and structural pieces are reduced, and temperature rise is reduced. In addition, the low-voltage winding is in series connection with the electric reactor winding so as to increase the short circuit impedance between high-low and middle-low of the transformer.

Description

A kind of 500kV level three-phase three winding non-excitation pressure adjustment high-impedance electric power transformers
Technical field:
The utility model relates to field transformer, relates in particular to a kind of 500kV level three-phase three winding non-excitation pressure adjustment high-impedance electric power transformers.
Background technology:
Present domestic 500kV EHV transformer is general to adopt three single-phase product mixes to use, and structure is simple relatively, but the fabricating yard is big, and consumable material is many, cost is high.
At present the implementation method of high-impedance transformer generally is through adjustment core-diameter and winding parameter, also will take to split measure such as winding in case of necessity and reach the purpose that improves transformer impedance.The key that adopts conventional structure to improve transformer impedance is the leakage field control to winding, and corresponding loss control and temperature rise control.For high-power transformer, it is that winding and the interior stray loss of structural member significantly increase that leakage flux increases the outstanding problem of being brought, and the temperature rise of corresponding site improves thereupon.This controls with regard to the stray field that requires structurally to adopt an effective measure to transformer, prevents that winding and structural member from producing local overheating, guarantees the safe operation of transformer.
The utility model content:
The purpose of the utility model just provides a kind of 500kV level three-phase three winding non-excitation pressure adjustment high-impedance electric power transformers, and solving the key that adopts conventional structure to improve transformer impedance is the leakage field control to winding, and corresponding loss control and temperature rise control.For high-power transformer, it is that winding and the interior stray loss of structural member significantly increase the problem that the temperature rise of corresponding site improves thereupon that leakage flux increases the outstanding problem of being brought.
The technical scheme that the utility model adopts is:
A kind of 500kV level three-phase three winding non-excitation pressure adjustment high-impedance electric power transformers comprise iron core: have the three-phase and five-pole iron core, outer concentric locking collar unshakable in one's determination is equipped with low pressure winding, middle pressure winding, high pressure winding, and the low pressure windings in series has reactor.
Described transformer voltage ratio is: (525 ± 2*2.5%)/36/10.5 kV.
The described three-phase and five-pole structure that adopts unshakable in one's determination, core lamination adopts six grades of ladder stepping bridging arrangements.
Described each winding circuit is connected with the non-excitation pressure adjustment switch, and said non-excitation pressure adjustment switch adopts three-phase integrated structure and is placed on the oil tank of transformer end.
Described low pressure winding and reactor windings in series, with increase transformer high-low, in-short-circuit impedance of low tone.
Compared with prior art, the beneficial effect of the utility model is:
The utility model can effectively reduce leakage flux through concentric suit low pressure winding, middle pressure winding, high pressure winding outside the three-phase and five-pole iron core, reduces the stray loss in winding and the structural member, reduces temperature rise; Simultaneously with low pressure winding and reactor windings in series, with increase transformer high-low, in-short-circuit impedance between low winding.
Description of drawings:
Fig. 1 is that the iron core assembling and the winding of the utility model arranged sketch map;
Fig. 2 is the utility model vertical view;
Fig. 3 is the winding connection schematic diagram of the utility model.
Embodiment:
Below in conjunction with accompanying drawing, the utility model is done further explain through embodiment:
A kind of 500kV level three-phase three winding non-excitation pressure adjustment high-impedance electric power transformers comprise unshakable in one's determination 1: have three-phase and five-pole iron core 1,1 outer concentric locking collar unshakable in one's determination is equipped with low pressure winding 2, middle pressure winding 3, high pressure winding 4; Low pressure winding 2 is in series with reactor 5; Transformer voltage ratio is: (core lamination adopts six grades of ladder stepping bridging arrangements for 525 ± 2*2.5%)/36/10.5 kV, the three-phase and five-pole structure that adopts unshakable in one's determination; Each winding circuit is connected with the non-excitation pressure adjustment switch; The non-excitation pressure adjustment switch adopts three-phase integrated structure and is placed on the oil tank of transformer end, low pressure winding and reactor windings in series, with increase transformer high-low, in-short-circuit impedance of low tone.
Referring to Fig. 1, iron core is the three-phase and five-pole structure, and core lamination adopts six grades of ladder stepping bridging arrangements.Iron yoke place strains with drawstring, and stem, return yoke place are with the colligation of rare latitude band, and folder from top to bottom connects with arm-tie, and stem part inter-stage adopts the round log stay to support.
The winding spread pattern: from iron core outwards be followed successively by iron core-low pressure winding-pressure winding-high pressure winding.
The non-excitation pressure adjustment switch adopts three-phase integrated structure and is placed on oil tank of transformer end, handled easily.
In order to realize high impedance, adopt built-in reactor, and with the low pressure windings in series together.Reactor adopts the three-phase three-column structure, and in order to reduce leakage field, reactor winding upper and lower side adds magnetic screen.Magnetic screen forms with the electrical steel strip stack, is rectangular configuration, and Width is concordant with the winding external diameter, and length direction and A, C phase winding external diameter are concordant, are tightened to one with folder, again through drawing screw rod to compress winding.
The reactor winding adopts double-spiral structure, the coiling of paper bag copper strap wire.Low pressure winding terminal (x ' y ' z ') and reactor winding head end (a ' b ' c ') be connected with bolted through rigid copper bus.Connected mode is seen Fig. 3 elementary diagram.
The foregoing description is merely the preferred implementation of the utility model, and in addition, the utility model can also have other implementations.Need to prove that under the prerequisite that does not break away from the utility model design, any conspicuous improvement and modification all should fall within the protection range of the utility model.

Claims (5)

1. 500kV level three-phase three winding non-excitation pressure adjustment high-impedance electric power transformers comprise iron core, it is characterized in that: have the three-phase and five-pole iron core, outer concentric locking collar unshakable in one's determination is equipped with low pressure winding, middle pressure winding, high pressure winding, and the low pressure windings in series has reactor.
2. 500kV level three-phase three winding non-excitation pressure adjustment high-impedance electric power transformers according to claim 1, it is characterized in that: described transformer voltage ratio is: (525 ± 2*2.5%)/36/10.5 kV.
3. 500kV level three-phase three winding non-excitation pressure adjustment high-impedance electric power transformers according to claim 1 is characterized in that: the described three-phase and five-pole structure that adopts unshakable in one's determination, core lamination adopts six grades of ladder stepping bridging arrangements.
4. 500kV level three-phase three winding non-excitation pressure adjustment high-impedance electric power transformers according to claim 1; It is characterized in that: described each winding circuit is connected with the non-excitation pressure adjustment switch, and said non-excitation pressure adjustment switch adopts three-phase integrated structure and is placed on the oil tank of transformer end.
5. 500kV level three-phase three winding non-excitation pressure adjustment high-impedance electric power transformers according to claim 1 is characterized in that: described low pressure winding and reactor windings in series, with increase transformer high-low, in-short-circuit impedance of low tone.
CN2011205265617U 2011-12-16 2011-12-16 500kV-grade three-phase three-winding excitation-free pressure regulating high-impedance power transformer Expired - Fee Related CN202363228U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011205265617U CN202363228U (en) 2011-12-16 2011-12-16 500kV-grade three-phase three-winding excitation-free pressure regulating high-impedance power transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011205265617U CN202363228U (en) 2011-12-16 2011-12-16 500kV-grade three-phase three-winding excitation-free pressure regulating high-impedance power transformer

Publications (1)

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CN202363228U true CN202363228U (en) 2012-08-01

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Application Number Title Priority Date Filing Date
CN2011205265617U Expired - Fee Related CN202363228U (en) 2011-12-16 2011-12-16 500kV-grade three-phase three-winding excitation-free pressure regulating high-impedance power transformer

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103559983A (en) * 2013-09-23 2014-02-05 保定保菱变压器有限公司 Low-noise SF6 gas insulated transformer and manufacturing method thereof
CN103680883A (en) * 2013-12-25 2014-03-26 保定天威保变电气股份有限公司 500kV-level split on-load voltage regulation power transformer
WO2023056657A1 (en) * 2021-10-10 2023-04-13 吴江变压器有限公司 High-impedance transformer having built-in reactor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103559983A (en) * 2013-09-23 2014-02-05 保定保菱变压器有限公司 Low-noise SF6 gas insulated transformer and manufacturing method thereof
CN103680883A (en) * 2013-12-25 2014-03-26 保定天威保变电气股份有限公司 500kV-level split on-load voltage regulation power transformer
WO2023056657A1 (en) * 2021-10-10 2023-04-13 吴江变压器有限公司 High-impedance transformer having built-in reactor

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C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20120801

Termination date: 20141216

EXPY Termination of patent right or utility model