CN201918250U - Voltage transformer - Google Patents
Voltage transformer Download PDFInfo
- Publication number
- CN201918250U CN201918250U CN2010206027749U CN201020602774U CN201918250U CN 201918250 U CN201918250 U CN 201918250U CN 2010206027749 U CN2010206027749 U CN 2010206027749U CN 201020602774 U CN201020602774 U CN 201020602774U CN 201918250 U CN201918250 U CN 201918250U
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- China
- Prior art keywords
- winding
- voltage transformer
- iron core
- wound
- coil assembly
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Abstract
The utility model relates to a voltage transformer, comprising winding components wound around an iron core, and the winding components and the iron core are all sealed in an insulator. The voltage transformer is characterized in that the winding components comprise a secondary winding, an insulating layer, a primary winding and a grading ring, wherein the secondary winding is directly wound around the outside surface of the iron core, the insulating layer is wound around the outside surface of the secondary winding, the primary winding is wound around the outside surface of the insulating layer, and the grading ring is wound around the outside surface of the primary winding. Compared with the prior art, the voltage transformer has the advantages that the insulation level of the tail end of the primary winding is improved to 20kV, so as to meet the high voltage caused by voltage division of a resonance eliminator; the large secondary load is large, the precision is high, and the surface creep distance is long; and the primary winding is placed on the grading ring, and a semi-conducting material is wrapped outside the iron core, therefore, the electrical field of the whole product is uniform without suspended electrical potential. If the product is not ideal due to an error after casting, the product can be adjusted by an added compensating coil, so that the error can achieve the best state.
Description
Technical field
The utility model relates to the instrument transformer technical field, particularly relates 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.
The present direct ground connection of neutral point of 35KV earthed voltage transformer of producing, and the overvoltage that a lot of user produces when preventing resonance and single phase ground fault is burnt instrument transformer, and a neutral point is passed through resonance eliminator ground connection.When single phase ground fault and resonance take place, the effect of resonance eliminator performance dividing potential drop, the voltage of neutral point raises, but the insulation level of a winding end 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 adopt all insulation structure in the switch cubicle assembling, then the volume of instrument transformer increases, thereby whole switch cubicle volume is strengthened.
The utility model content
The technical problem that the utility model solves is to provide under a kind of situation that does not need to increase whole switch cubicle volume and a terminal withstand voltage level of winding can be improved several times voltage transformer at above-mentioned prior art.
The utility model 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: described coil assembly comprises:
Directly be wound on the secondary winding of the outer surface of iron core exterior insulation copper;
Be wound on the insulating barrier of described secondary winding outer surface;
Be wound on a winding of described insulating barrier outer surface;
Be wound on the grading ring of a described winding outer surface.
" N " end of a described winding is drawn with lead, and the end of this lead exposes to described insulator, and the lead outer cover of drawing a described winding " N " end simultaneously is provided with heat-shrink tube.
The described iron core integral installation that is wound with coil assembly on a bracing frame, this bracing frame also sealing and fixing in described insulator.
Described voltage transformer is the voltage transformer of 35KV, described insulator total height is 500～600 millimeters, and the wire end of drawing a described winding " N " end is 110 to 120 millimeters apart from the distance of support frame as described above upper surface, 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.
Described insulating barrier adopts PMP polyester film condenser paper to make, and its thickness is 4 to 7 millimeters.
Described core exterior surface does not have the position of the described coil assembly of coiling to be enclosed with semiconductor crimped paper screen.
The undesirable situation of error appears after cast as fruit product, as improvement, described coil assembly also comprises the outer surface that is wound on iron core exterior insulation copper, the bucking coil adjacent with described secondary winding, adjust by the bucking coil that adds, can make the error of product reach optimum state.
Compared with prior art, advantage of the present utility model is: the terminal insulation level of a winding is brought up to 20kV, the high voltage that satisfies the resonance eliminator dividing potential drop and cause, secondary load is big, the precision height, 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 to occur as fruit product after cast, can also be by adding bucking coil adjustment, make error reach optimum state, owing to improved the insulation level of a winding end 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 among the utility model embodiment.
Fig. 2 is the structural representation of voltage transformer among the utility model embodiment two.
Embodiment
Embodiment describes in further detail the utility model 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 copper 10 outer surfaces secondary winding 3, be wound on thickness that the employing PMP polyester film kraft capacitor paper of described secondary winding outer surface makes be 5 millimeters insulating barrier 4, be wound on described insulating barrier outer surface a winding 5, be wound on the grading ring 6 of a described 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 described hollow insulator.
" N " end of a described winding 5 is drawn with annealed copper strand wire 8, the end of this annealed copper strand wire 8 exposes to described insulator, the annealed copper strand wire outer cover of drawing a described winding " N " end simultaneously is provided with heat-shrink tube, the annealed copper strand wire end-to-end distance of drawing a described 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 described winding " N " end is 151 millimeters from described insulator outer bottom height H 3.And core exterior surface does not have the position of the described coil assembly of coiling to be enclosed with semiconductor crimped paper screen 9.
35KV voltage transformer with said structure, the withstand voltage level of the end of its winding is brought up to 20kv by 5kv of the prior art, secondary load is big, the precision height, 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 described 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,
As shown in Figure 2, different with embodiment one is that described coil assembly also comprises the outer surface that is wound on iron core exterior insulation copper, the bucking coil 11 adjacent with described secondary winding.It is undesirable error to occur as fruit product after cast, can adjust by the described bucking coil that adds, and makes error reach optimum state.
Claims (7)
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: described coil assembly comprises:
Directly be wound on the secondary winding of the outer surface of iron core exterior insulation copper;
Be wound on the insulating barrier of described secondary winding outer surface;
Be wound on a winding of described insulating barrier outer surface;
Be wound on the grading ring of a described winding outer surface.
2. voltage transformer according to claim 1 is characterized in that: " N " end of a described winding is drawn with lead, and the end of this lead leaks outside in described insulator, and the lead outer cover of drawing a described winding " N " end simultaneously is provided with heat-shrink tube.
3. voltage transformer according to claim 2 is characterized in that: the described iron core integral installation that is wound with coil assembly on a bracing frame, this bracing frame also sealing and fixing in described insulator.
4. voltage transformer according to claim 3, it is characterized in that: described voltage transformer is the voltage transformer of 35KV, described insulator total height is 500～600 millimeters, and the wire end of drawing a described winding " N " end is 110 to 120 millimeters apart from the distance of support frame as described above upper surface.
5. according to any described voltage transformer of claim in the claim 1～4, it is characterized in that: described insulating barrier adopts PMP polyester film condenser paper to make, and its thickness is 4 to 7 millimeters.
6. voltage transformer according to claim 1 is characterized in that: described core exterior surface does not have the position of the described coil assembly of coiling to be enclosed with semiconductor crimped paper screen.
7. voltage transformer according to claim 1 is characterized in that: described coil assembly also comprises the outer surface that is wound on iron core exterior insulation copper, the bucking coil adjacent with described secondary winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206027749U CN201918250U (en) | 2010-11-05 | 2010-11-05 | Voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206027749U CN201918250U (en) | 2010-11-05 | 2010-11-05 | Voltage transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201918250U true CN201918250U (en) | 2011-08-03 |
Family
ID=44418042
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206027749U Expired - Lifetime CN201918250U (en) | 2010-11-05 | 2010-11-05 | Voltage transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201918250U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064011A (en) * | 2010-11-05 | 2011-05-18 | 宁波三爱互感器有限公司 | Voltage transformer |
| CN102479607A (en) * | 2010-11-27 | 2012-05-30 | 江苏思源赫兹互感器有限公司 | Dividing type electronic voltage transformer of single-phase capacitor |
| CN105988037A (en) * | 2016-07-08 | 2016-10-05 | 武汉电联电力电气技术有限公司 | High-voltage three-potential insulated isolated current sensor |
-
2010
- 2010-11-05 CN CN2010206027749U patent/CN201918250U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064011A (en) * | 2010-11-05 | 2011-05-18 | 宁波三爱互感器有限公司 | Voltage transformer |
| CN102479607A (en) * | 2010-11-27 | 2012-05-30 | 江苏思源赫兹互感器有限公司 | Dividing type electronic voltage transformer of single-phase capacitor |
| CN105988037A (en) * | 2016-07-08 | 2016-10-05 | 武汉电联电力电气技术有限公司 | High-voltage three-potential insulated isolated current sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110803 Effective date of abandoning: 20120530 |