CN201449871U - Electromagnetic type potential transformer with open type iron core - Google Patents
Electromagnetic type potential transformer with open type iron core Download PDFInfo
- Publication number
- CN201449871U CN201449871U CN2009200164006U CN200920016400U CN201449871U CN 201449871 U CN201449871 U CN 201449871U CN 2009200164006 U CN2009200164006 U CN 2009200164006U CN 200920016400 U CN200920016400 U CN 200920016400U CN 201449871 U CN201449871 U CN 201449871U
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- Prior art keywords
- iron core
- winding
- potential transformer
- wound
- outer cover
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- 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
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Abstract
The utility model relates to an electromagnetic type potential transformer with an open type iron core, comprising an expander outer cover (2), wherein the expander outer cover (2) is provided with a high-voltage terminal (1), the interior of the expander outer cover (2) is provided with a metal expander (3), the elements are connected together with a porcelain bushing (5) by flanges (4), the open type iron core (9) is vertically placed in the porcelain bushing (5) and fixed on a base (10) by a fastener, the outer side of the iron core (9) is wound with a secondary winding (7) of the potential transformer and a primary winding (8) wound on an insulating frame, and a major insulation (6) of the potential transformer is arranged between the primary winding (8) and the secondary winding (7). In the electromagnetic type potential transformer, as the iron core is in open type, a magnetic circuit is closed by air, and the excitation characteristic of the iron core is linear, so that the problem that ferromagnetic resonance is easy to generate due to the closing of the iron core is fundamentally solved.
Description
Technical field
The utility model relates to the High-Voltage Electrical Appliances field, particularly relates to a kind of electromagnetic potential transformer with open iron core.
Background technology
According to operation principle, voltage transformer can be divided into two kinds of electromagnetic type and condenser types, and the traditional electrical magnetic-type comprises electromagnetic potential transformer and the cascade-type voltage transformer with closed core.Have in the electromagnetic potential transformer of closed core, primary winding and secondary coil only are placed on the stem stem usually, iron core grounding.The device body is placed in the casing of ground connection.Coil turns to a lot of layers usually, and layer insulation is an oil-paper, and the insulation that is placed on the primary winding interlayer does not have oil clearance.The advantage of this structure is that impact and high frequency overvoltage have good ability to bear, and shortcoming is a coil heat radiation difficulty.If add electric screen and oil clearance in the insulation of primary winding interlayer, this structure has improved the heat dispersion of coil, still, when design and construction, must consider the problem of end winding electric field structure.This kind of cascade-type voltage transformer structure can be so that the problem of the insulation of electromagnetic potential transformer and heat radiation difficulty be eased.Specifically exactly several instrument transformer primary windings are connected in series, the center of each coil is connected to iron core.Like this, the voltage on the primary winding of iron core is to apply 1/4th of voltage.This connection causes two current potential differences on the iron core, and two iron cores will independent separately and insulation.With bucking coil up and down two link together.When not having this bucking coil, have only when secondary does not connect load, the voltage that is distributed on the primary winding is uniform.If secondary connects load, at this moment descend the voltage on the planar coil to reduce, the voltage on the last planar coil will raise.If like this, secondary can only connect little load.Add after the bucking coil that the voltage on each grade distributes and will improve.The disadvantage of the instrument transformer of this principle is the raising along with electric pressure, and it is too big that volume becomes, thereby science not.
The utility model content
In order successfully to solve the deficiency of above-mentioned two kinds of voltage transformers in the prior art, the utility model provides a kind of electromagnetic potential transformer with open iron core, and it has fundamentally solved the problem that ferro resonance easily takes place in closed core; A winding of this kind voltage transformer has segmental structure, has improved the tolerance atmospheric over-voltage and has transmitted superpotential ability fast, has limited fault current.
In order to solve the problem that prior art exists, the technical solution adopted in the utility model is:
A kind of electromagnetic potential transformer with open iron core, include the expander outer cover, the expander outer cover is provided with HV Terminal, metal expander is equipped with in its inside, above-mentioned parts link together by flange and insulator, iron core is fixed on the base by securing member, the outside unshakable in one's determination is wound with the secondary winding of voltage transformer and is wound on a winding on the insulation framework, be provided with the main insulation of voltage transformer between winding and the secondary winding, bottom at the secondary terminal board also is provided with the cable outlet pipe, described iron core is the bar-shaped open iron core that is formed by the silicon steel sheet stack, and iron core is not closed, vertically is placed in the insulator.
A described winding is to adopt the multilayer segmentation to be wound on the insulation framework, forms with the capacitive part of main insulation inside to be connected in parallel.
Advantage that the utility model had and effect:
1, a kind of electromagnetic potential transformer with open iron core of the utility model is because unshakable in one's determination for open, and magnetic circuit is by the air closure, excitation property unshakable in one's determination be a linearity, has fundamentally solved the problem that ferro resonance easily takes place in closed core.
2, a kind of winding of electromagnetic potential transformer with open iron core of the utility model is divided into a plurality of line segments, forms with the capacitor type structure of main insulation inside to be connected in parallel.This segmental structure increases vertical electric capacity of a winding, has improved the tolerance atmospheric over-voltage and has transmitted superpotential ability fast.When internal fault or turn-to-turn short circuit took place, main insulation and a winding internal fault were partly separated, thereby have limited fault current.
3, a kind of line segment relative thin and height of the utility model with winding of electromagnetic potential transformer of open iron core, total area of dissipation strengthens, and product temperature rise performance is good.
4, a kind of structure with winding of electromagnetic potential transformer of open iron core of the utility model makes along insulator short transverse power-frequency voltage distribution optimization, has improved the electrical strength of external insulation.
5, a kind of electromagnetic potential transformer mechanization with open iron core of the utility model is produced and has been avoided artificial factor, thereby guarantees product quality.
6, a kind of electromagnetic potential transformer and inverted type current transformer with open iron core of the utility model can constitute the high pressure combination transformer.
Description of drawings
Fig. 1 is a longitudinal sectional drawing of the present utility model.
Wherein: HV Terminal 1; Expander outer cover 2; Metal expander 3; Flange 4; Insulator 5; Main insulation 6; Secondary winding 7; A winding 8; Unshakable in one's determination 9; Base 10; Secondary terminal board 11; Cable outlet pipe 12.
Embodiment
As shown in Figure 1, a kind of electromagnetic potential transformer with open iron core of the utility model includes expander outer cover 2, be provided with HV Terminal 1 on expander outer cover 2, metal expander 3 is installed in expander outer cover 2, above-mentioned parts link together by flange 4 and insulator 5.By bar-shaped open unshakable in one's determination 9 vertically being placed in the insulator 5 that the silicon steel sheet stack forms, adopt mechanical system to be fixed on the base 10 by securing member.Open 9 outsides unshakable in one's determination are wound with the secondary winding 7 of voltage transformer and adopt the multilayer segmentation to be wound on a winding 8 on the insulation framework, be provided with the main insulation 6 of voltage transformer between winding 8 and the secondary winding 7, be used for the high voltage part isolated with the low-voltage part.Main insulation 6 has the capacitor type structure, along the main insulation 6 short transverses winding that distributing a time.Winding 8 adopts the multilayer segmentations to be wound on the insulation framework, forms with the capacitive part of main insulation 6 inside to be connected in parallel.Generally, the secondary winding number is 3, can accomplish 4 at most.A then difference to some extent of winding quantity according to the electric pressure difference.The secondary terminal of voltage transformer and the earth terminal of primary side etc. all appear at secondary terminal board 11 inside, also are provided with cable outlet pipe 12 in the bottom of secondary terminal board 11.
Claims (2)
1. electromagnetic potential transformer with open iron core, include expander outer cover (2), expander outer cover (2) is provided with HV Terminal (1), metal expander (3) is equipped with in its inside, above-mentioned parts link together by flange (4) and insulator (5), (9) unshakable in one's determination are fixed on the base (10) by securing member, unshakable in one's determination (9) outside is wound with the secondary winding (7) of voltage transformer and is wound on a winding (8) on the insulation framework, be provided with the main insulation (6) of voltage transformer between a winding (8) and the secondary winding (7), also be provided with cable outlet pipe (12) in the bottom of secondary terminal board (11), it is characterized in that described iron core (9) is the bar-shaped open iron core that is formed by the silicon steel sheet stack, (9) unshakable in one's determination are not closed, vertically are placed in the insulator (5).
2. a kind of electromagnetic potential transformer with open iron core according to claim 1 is characterized in that a described winding (8) is to adopt the multilayer segmentation to be wound on the insulation framework, and the capacitive part formation inner with main insulation (6) is connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200164006U CN201449871U (en) | 2009-08-18 | 2009-08-18 | Electromagnetic type potential transformer with open type iron core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200164006U CN201449871U (en) | 2009-08-18 | 2009-08-18 | Electromagnetic type potential transformer with open type iron core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201449871U true CN201449871U (en) | 2010-05-05 |
Family
ID=42554593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200164006U Expired - Lifetime CN201449871U (en) | 2009-08-18 | 2009-08-18 | Electromagnetic type potential transformer with open type iron core |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201449871U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102082024A (en) * | 2010-11-09 | 2011-06-01 | 中国西电电气股份有限公司 | External-expander capacitive voltage transformer and vacuum treatment method thereof |
-
2009
- 2009-08-18 CN CN2009200164006U patent/CN201449871U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102082024A (en) * | 2010-11-09 | 2011-06-01 | 中国西电电气股份有限公司 | External-expander capacitive voltage transformer and vacuum treatment method thereof |
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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 | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100505 |