CN204117825U - A kind of electromagnetic potential transformer - Google Patents
A kind of electromagnetic potential transformer Download PDFInfo
- Publication number
- CN204117825U CN204117825U CN201420536513.XU CN201420536513U CN204117825U CN 204117825 U CN204117825 U CN 204117825U CN 201420536513 U CN201420536513 U CN 201420536513U CN 204117825 U CN204117825 U CN 204117825U
- Authority
- CN
- China
- Prior art keywords
- primary winding
- secondary coil
- housing
- transformer
- annular core
- 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.)
- Expired - Lifetime
Links
- 238000004804 winding Methods 0.000 claims abstract description 19
- 241000826860 Trapezium Species 0.000 claims abstract description 5
- 239000003822 epoxy resin Substances 0.000 claims abstract description 5
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000009413 insulation Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Transformers For Measuring Instruments (AREA)
Abstract
The utility model relates to a kind of electromagnetic potential transformer, comprise annular core, primary winding, secondary coil and housing, primary winding and secondary coil to be wound on annular core by poured with epoxy resin in housing, and described primary winding coiling cross section is the trapezium structure that ecto-entad gradual change increases.Its reasonable in design, the utilance of insulating space reaches maximization, saves the space shared by instrument transformer in switch cubicle, for the miniaturization of switch cubicle provides possibility, meets electric power system high-tension measurement or relay protection device instructions for use.
Description
Technical field
The utility model relates to a kind of voltage transformer, is a kind of electromagnetic potential transformer specifically.
Background technology
Electromagnetic potential transformer is one of large components and parts of three in Medium Voltage Switchgear, and in the accident of current electric power system, the accident of instrument transformer accounts for quite a few.The instrument transformer overwhelming majority of accident is voltage transformer.So voltage transformer is accident district occurred frequently and severely afflicated area.Because he adopts electromagnetic induction principle, the principle defect of itself causes part accident.But also there are much relations with the quality of this product own.Current measurement instrument transformer quality, mainly by power frequency short-time withstand voltage test, and partial discharge test is weighed.Therefore partial discharge test measurement is vital, especially for 35kV and above electromagnetic transformer.Current whole middle pressure industry casting transformer in the highest flight, but at present partial discharge can't be resolved very well, the product that the 35kV that can not meet national standard is put in office also has a lot at present.Qualification rate is generally on the low side, says also whether very desirable, can accomplish test point partial discharge in afternoon very well even if qualified from quality.Cause the wasting of resources of whole instrument transformer industry because qualification rate is low, consume a large amount of manpower and consume national nonferrous metal resource.
The iron core of transformer iron core industry is rectangular configuration, and the winding displacement mode of a winding is divided into, the structure of a step or multiple step pagoda type.Pagoda type structure due to than single-order more can performance more excellent, current 20kV and above this structure of basic employing.This structure compares the utilance that single-order increases insulating space, strengthens the insulation effect to surge voltage.But because pagoda type structure also exists several tip (point step place), cause this place's field intensity uneven, therefore defectiveness in performance.Single-order shortcoming is more obvious, and the insulation distance of waste is larger, and performance can not show a candle to pagoda type.
Summary of the invention
For the deficiency existed in a winding of single-order in prior art and pagoda type structure, it is simple that the utility model provides a kind of structure, and the utilance of insulating space maximizes, and saves and taken up space, without a kind of electromagnetic potential transformer that office puts.
The technical solution adopted in the utility model is: a kind of electromagnetic potential transformer, comprise annular core, primary winding, secondary coil and housing, primary winding and secondary coil to be wound on annular core by poured with epoxy resin in housing, and its technical characterstic is described primary winding coiling cross section is the trapezium structure that ecto-entad gradual change increases.
The trapezoidal base in described primary winding coiling cross section does not exceed secondary coil.
Be cast in by poured with epoxy resin in mould, form an entirety after solidification, trapezoidal coil structure is from low-pressure end to high-pressure side, and voltage progressively increases progressively, and insulation distance progressively strengthens, and whole Analysis of End Electric Field is even, there will not be obvious tip.The volume of trapezoidal coil structure is far longer than the volume of ladder pagoda-shaped, and trapezium structure enamelled wire used can be thicker than pagoda-shaped, and voltage transformer capacity is greater than conventional pagoda-shaped, and coil leakage reactance, than conventional little, is conducive to transformer error characteristic; Because end field intensity is even, improve anti-overvoltage and the impact resistance of product greatly, safely, reliably, put without office, greatly promote the performance of instrument transformer, reduce voltage transformer accident rate in use, improve the power supply quality of power department, indirectly reduce causing damage because of power failure.
The utility model reasonable in design, the utilance of insulating space reaches maximization, saves the space shared by instrument transformer in switch cubicle, for the miniaturization of switch cubicle provides possibility, meets electric power system high-tension measurement or relay protection device instructions for use.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation.
In figure: annular core 1, primary winding 2, secondary coil 3.
Embodiment
Be further described below in conjunction with accompanying drawing.
Shown in Fig. 1, a kind of electromagnetic potential transformer comprises annular core 1, primary winding 2, secondary coil 3 and housing, primary winding 2 and secondary coil 3 to be wound on annular core 1 by poured with epoxy resin in housing, primary winding coiling cross section is the trapezium structure that ecto-entad gradual change increases, and the trapezoidal base in primary winding coiling cross section does not exceed secondary coil.
Claims (2)
1. an electromagnetic potential transformer, comprise annular core, primary winding, secondary coil and housing, primary winding and secondary coil to be wound on annular core by poured with epoxy resin in housing, it is characterized in that: described primary winding coiling cross section is the trapezium structure that ecto-entad gradual change increases.
2. a kind of electromagnetic potential transformer according to claim 1, is characterized in that: the trapezoidal base in primary winding coiling cross section does not exceed secondary coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420536513.XU CN204117825U (en) | 2014-09-18 | 2014-09-18 | A kind of electromagnetic potential transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420536513.XU CN204117825U (en) | 2014-09-18 | 2014-09-18 | A kind of electromagnetic potential transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204117825U true CN204117825U (en) | 2015-01-21 |
Family
ID=52335113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420536513.XU Expired - Lifetime CN204117825U (en) | 2014-09-18 | 2014-09-18 | A kind of electromagnetic potential transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204117825U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104240927A (en) * | 2014-09-18 | 2014-12-24 | 江苏科兴电器有限公司 | Electromagnetic voltage transformer |
-
2014
- 2014-09-18 CN CN201420536513.XU patent/CN204117825U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104240927A (en) * | 2014-09-18 | 2014-12-24 | 江苏科兴电器有限公司 | Electromagnetic voltage transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20150121 |