CN102064011B - Voltage transformer - Google Patents
Voltage transformer Download PDFInfo
- Publication number
- CN102064011B CN102064011B CN2010105403443A CN201010540344A CN102064011B CN 102064011 B CN102064011 B CN 102064011B CN 2010105403443 A CN2010105403443 A CN 2010105403443A CN 201010540344 A CN201010540344 A CN 201010540344A CN 102064011 B CN102064011 B CN 102064011B
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- winding
- wound
- voltage transformer
- iron core
- coil assembly
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Abstract
The invention relates to a voltage transformer, comprising a winding part wound on an iron core, wherein the winding part and the iron core are both sealed in an insulator, the voltage transformer is characterized in that the winding part comprises a secondary winding directly wound on an external surface of the iron core, an insulating layer wound on an external surface of the second winding, a primary winding wound on an external surface of the insulating layer, and a grading ring wound on an external surface of the primary winding. Compared with the prior art, the voltage transformer of the invention has the following advantages: insulation level of a tail end of the primary winding is improved to 20kV so as to satisfy high voltage caused by voltage division of a resonance eliminator, secondary load is large, precision is high, surface creepage distance is large, the grading ring is placed on the primary winding, and the iron core is covered with semiconductor materials, so that the whole product has uniform electric field and has no suspension potential. If the product has unsatisfactory error after casting, the product can be adjusted by externally adding a compensation coil so as to achieve optimal state of the error.
Description
Technical field
The present invention relates to the instrument transformer technical field, particularly relate to a kind of voltage transformer.
Background technology
The structure of most voltage transformers comprises the iron core of being with coil assembly; This coil assembly and iron core all are sealed in the insulator by the epoxy resin mixed glue making; The below of this iron core connects a bracing frame, and the below of this bracing frame is provided with one the base plate of usefulness is installed.
Neutral point of 35KV earthed voltage transformer of producing at present is ground connection directly, and the overvoltage that a lot of user produces when preventing resonance and single phase ground fault is burnt instrument transformer, passes through resonance eliminator ground connection to a neutral point.When the single phase ground fault resonant takes place; The effect of resonance eliminator performance dividing potential drop, the voltage of neutral point raises, but the terminal insulation level of winding of voltage transformer has only 5kV; Can not satisfy electrical network actual motion needs, the terminal breakdown accident of winding of voltage transformer often takes place.If in the switch cubicle assembling, adopt all insulation structure, then the volume of instrument transformer increases, thereby whole switch cubicle volume is strengthened.
Summary of the invention
The technical problem that the present invention solves is to provide under a kind of situation that need not increase whole switch cubicle volume and can a terminal withstand voltage level of winding be improved several times voltage transformer to above-mentioned prior art.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: this voltage transformer, comprise the coil assembly that is wound on the iron core, and coil assembly and iron core all are sealed in the insulator, it is characterized in that: said coil assembly comprises:
Directly be wound on the secondary winding of the outer surface of iron core exterior insulation tube;
Be wound on the insulating barrier of said secondary winding outer surface;
Be wound on a winding of said insulating barrier outer surface;
Be wound on the grading ring of a said winding outer surface.
" N " end of a said winding is drawn with lead, and the end of this lead exposes to said insulator, and the lead outer cover of drawing a said winding " N " end simultaneously is provided with heat-shrink tube;
The said iron core integral installation that is wound with coil assembly on a bracing frame, this bracing frame also sealing and fixing in said insulator;
Said voltage transformer is the voltage transformer of 35KV; Said insulator total height is 500～600 millimeters; And the wire end of drawing a said winding " N " end is 110 to 120 millimeters apart from the distance of support frame as described above upper surface, and the applicant is in the middle discovery that studies for a long period of time, under this distance; The interference of end that can a winding of bigger raising, and can also improve its insulation level.
Said insulating barrier adopts PMP polyester film condenser paper to process, and its thickness is 4 to 7 millimeters.
Said core exterior surface does not have the position of the said coil assembly of coiling to be enclosed with semiconductor crimped paper screen.
The undesirable situation of error appears after cast like fruit product; As improvement; Said coil assembly also comprises the outer surface that is wound on iron core exterior insulation tube, the bucking coil adjacent with said secondary winding; Bucking coil through adding is adjusted, and can make the error of product reach optimum state.
Compared with prior art, the invention has the advantages that: the terminal insulation level of a winding is brought up to 20kV, satisfies the resonance eliminator dividing potential drop and the high voltage that causes; Secondary load is big, and precision is high, and surperficial creep distance is big; One time winding is placed grading ring outward; Outsourcing semi-conducting material unshakable in one's determination makes the entire product electric field even, does not have floating potential.It is undesirable error after cast, to occur like fruit product; Can also be through adding bucking coil adjustment; Make error reach optimum state, owing to improved the terminal insulation level of winding in this type instrument transformer product, make whole to open that cabinet is long-pending to be dwindled, reduce cost.
Description of drawings
Fig. 1 is the structural representation of voltage transformer in the embodiment of the invention one.
Fig. 2 is the structural representation of voltage transformer in the embodiment of the invention two.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Embodiment one,
35KV voltage transformer as shown in Figure 1, it comprises the insulator 1 of conventional shape, and the whole height of insulator is 566 millimeters, and this insulator inner sealing is provided with iron core 2, is wound on coil assembly and bracing frame on the iron core 2.Iron core is " mouth " font; Above-mentioned coil assembly is wound on the transverse axis of iron core, and coil assembly comprises: directly be wound on iron core exterior insulation tube 10 outer surfaces secondary winding 3, be wound on thickness that the employing PMP polyester film kraft capacitor paper of said secondary winding outer surface processes be 5 millimeters insulating barrier 4, be wound on said insulating barrier outer surface a winding 5, be wound on the grading ring 6 of a said winding outer surface.The above-mentioned iron core integral installation that is wound with coil assembly is on support frame as described above 7, and the support frame as described above sealing and fixing is at the inner low side of said hollow insulator.
" N " end of a said winding 5 is drawn with annealed copper strand wire 8; The end of this annealed copper strand wire 8 exposes to said insulator; The annealed copper strand wire outer cover of drawing a said winding " N " end simultaneously is provided with heat-shrink tube; The annealed copper strand wire end-to-end distance of drawing a said winding " N " end is 115 millimeters from the distance H 1 of support frame as described above upper surface; The bracing frame upper surface is 30 millimeters highly to hollow insulator inwall low side H2, and the annealed copper strand wire end-to-end distance of drawing a said winding " N " end is 151 millimeters from said insulator outer bottom height H 3.And core exterior surface does not have the position of the said coil assembly of coiling to be enclosed with semiconductor crimped paper screen 9.
Have the 35KV voltage transformer of said structure, the withstand voltage level of the end of its winding is brought up to 20kv by 5kv of the prior art, and secondary load is big; Precision is high; The surface creep distance is big, and one time winding is provided with grading ring outward, and core exterior surface does not have the position of the said coil assembly of coiling to be enclosed with semiconductor crimped paper screen; Make the entire product internal electric field even, do not have floating potential.Because the voltage transformer in the present embodiment has improved the insulation level of the end of a winding, makes whole switch cubicle volume-diminished, cost reduces.
Embodiment two,
Different with embodiment one is that said coil assembly also comprises the outer surface that is wound on iron core exterior insulation tube, the bucking coil 11 adjacent with said secondary winding.It is undesirable error after cast, to occur like fruit product, can adjust through the said bucking coil that adds, and makes error reach optimum state.
Claims (6)
1. a voltage transformer comprises the coil assembly that is wound on the iron core, and coil assembly and iron core all are sealed in the insulator, it is characterized in that: said coil assembly comprises:
Directly be wound on the secondary winding of the outer surface of iron core exterior insulation tube;
Be wound on the insulating barrier of said secondary winding outer surface;
Be wound on a winding of said insulating barrier outer surface;
Be wound on the grading ring of a said winding outer surface;
" N " end of a said winding is drawn with lead, and the end of this lead leaks outside in said insulator, and the lead outer cover of drawing a said winding " N " end simultaneously is provided with heat-shrink tube; Said insulator total height is 500～600 millimeters, and the wire end of drawing a said winding " N " end is 110 to 120 millimeters apart from the distance of support frame as described above upper surface.
2. voltage transformer according to claim 1 is characterized in that: the said iron core integral installation that is wound with coil assembly on a bracing frame, this bracing frame also sealing and fixing in said insulator.
3. voltage transformer according to claim 2 is characterized in that: said voltage transformer is the voltage transformer of 35KV.
4. according to any described voltage transformer of claim in the claim 1～3, it is characterized in that: said insulating barrier adopts PMP polyester film condenser paper to process, and its thickness is 4 to 7 millimeters.
5. voltage transformer according to claim 1 is characterized in that: said core exterior surface does not have the position of the said coil assembly of coiling to be enclosed with semiconductor crimped paper screen.
6. voltage transformer according to claim 1 is characterized in that: said coil assembly also comprises the outer surface that is wound on iron core exterior insulation tube, the bucking coil adjacent with said secondary winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105403443A CN102064011B (en) | 2010-11-05 | 2010-11-05 | Voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105403443A CN102064011B (en) | 2010-11-05 | 2010-11-05 | Voltage transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102064011A CN102064011A (en) | 2011-05-18 |
| CN102064011B true CN102064011B (en) | 2012-05-30 |
Family
ID=43999244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105403443A Expired - Fee Related CN102064011B (en) | 2010-11-05 | 2010-11-05 | Voltage transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102064011B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103578725B (en) * | 2012-07-20 | 2016-04-13 | 大连第一互感器有限责任公司 | Dry type voltage transformer for switchgear |
| CN102760567B (en) * | 2012-07-31 | 2015-04-22 | 福州天宇电气股份有限公司 | High-voltage transformer with epoxy shielding barrel and manufacturing method thereof |
| CN104144600B (en) * | 2013-08-19 | 2017-12-08 | 国家电网公司 | A kind of shading ring and shielding construction and casting type voltage mutual inductor |
| CN103545099A (en) * | 2013-10-22 | 2014-01-29 | 江苏靖江互感器厂有限公司 | Voltage mutual inductor |
| CN107578905A (en) * | 2017-10-17 | 2018-01-12 | 天津市百利纽泰克电气科技有限公司 | A kind of structure and method for improving voltage transformer partial discharge performance |
| CN108597826B (en) * | 2018-04-27 | 2020-11-24 | 上海大一互电力电器有限公司 | Totally-enclosed epoxy resin insulation voltage transformer |
| CN113936898B (en) * | 2021-11-12 | 2022-07-08 | 广东四会互感器厂有限公司 | Multi-step multi-layer shielding voltage transformer |
| CN116137200A (en) * | 2021-11-16 | 2023-05-19 | 华为数字能源技术有限公司 | Transformer and power equipment |
| CN115910559B (en) * | 2023-03-10 | 2023-09-22 | 国网福建省电力有限公司 | Standard voltage transformer, manufacturing method and combined standard voltage transformer |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60100412A (en) * | 1983-11-05 | 1985-06-04 | Mitsubishi Electric Corp | Dry type instrument transformer |
| JPH01227411A (en) * | 1988-03-08 | 1989-09-11 | Toshiba Corp | Mold-type instrument transformer |
| CN2702424Y (en) * | 2004-06-15 | 2005-05-25 | 孙长林 | Dry-type capacitor impedance voltage transformer |
| CN100470688C (en) * | 2006-08-18 | 2009-03-18 | 江苏东源电器集团股份有限公司 | 35KV semi-insulating voltage transformer with low partial discharge |
| CN201397739Y (en) * | 2008-12-30 | 2010-02-03 | 大连第二互感器集团有限公司 | Capacitive electromagnetic-type voltage mutual inductor |
| CN201918250U (en) * | 2010-11-05 | 2011-08-03 | 宁波三爱互感器有限公司 | Voltage transformer |
-
2010
- 2010-11-05 CN CN2010105403443A patent/CN102064011B/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN102064011A (en) | 2011-05-18 |
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