CN201877277U - Secondary winding structure for local magnetic biasing prevention current transformer - Google Patents
Secondary winding structure for local magnetic biasing prevention current transformer Download PDFInfo
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- CN201877277U CN201877277U CN2010206416535U CN201020641653U CN201877277U CN 201877277 U CN201877277 U CN 201877277U CN 2010206416535 U CN2010206416535 U CN 2010206416535U CN 201020641653 U CN201020641653 U CN 201020641653U CN 201877277 U CN201877277 U CN 201877277U
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Abstract
The utility model relates to a secondary winding structure for a local magnetic biasing prevention current transformer, in particular to a secondary winding for a vertical high-current transformer, belonging to the technical field of transformers. The utility model adopts the technical scheme that the secondary winding comprises an iron core (1), an iron core insulation (2), a main winding (3) and shielding windings (5), wherein a major insulation is wound on the iron core, the main winding is arranged outside the major insulation, a plurality of pairs of shielding windings with same number of turns, opposite winding directions and opposite positions are uniformly distributed outside the main winding, and the shielding windings are connected together. The secondary winding has the beneficial effects that the structure is novel, the impact of external magnetic field is reduced, the local magnetic biasing is prevented, the problem that the small instrument safety factor is in contradiction with the high rated primary current is solved, the measuring accuracy of the product reaches Grade 0.2S, and the factor of safety (FS) of an instrument is smaller than or equal to 5.
Description
Technical field:
The utility model relates to a kind of anti-local bias current instrument transformer secondary winding structure, and particularly just vertical large-current electric current transformer secondary winding belongs to instrument transformer manufacturing technology field.
Background technology:
Along with the continuous increase of net capacity, the primary current in the electrical network is also increasing, and the rated primary current of 220kV and 500kV current transformer reaches more than 4000 amperes.Vertical current transformer is generally " U " shape pipe because of Primary Conductor, and electric current flows into from the other end (be called and return conductor) from contact tube one end and flows out, and secondary winding is sleeved on wherein on the end, and this just exists and returns the influence of conductor to this secondary winding.Owing to the magnetic flux process iron core that the electric current that returns in the conductor produces, near the magnetic flux density increase of the iron core that returns conductor one side, the magnetic flux density minimizing away from the iron core that returns conductor one side makes the magnetic flux density of each section of iron core not wait.Because the magnetic flux path major part that this external magnetic field produces is passed through air, iron circuit is minimum one section, so its magnetic flux density is directly proportional with the magnetic permeability of air, and the magnetic line of force only with part secondary winding chain mutually, be the leakage field that the secondary leakage reactance is increased under normal operation.But under big current conditions (as 4000A), a number of ampere turns height often has the requirement of instrument safety coefficient again, and this moment, core dimensions can be very little.Cause is returned the conductor influence, can local magnetic bias occur in iron core, makes near the very fast growth of iron core magnetic flux density of returning conductor one side, and error strengthens rapidly, causes measurement level secondary winding error defective.
The utility model content:
The utility model purpose provides a kind of anti-local bias current instrument transformer secondary winding structure, reduces the external magnetic field influence, prevents local magnetic bias, solves the problems referred to above that exist in the background technology.
The technical solution of the utility model is:
A kind of anti-local bias current instrument transformer secondary winding structure, comprise iron core, core insulation, main winding, shielding winding, twine main insulation on the iron core, main insulation is provided with main winding outward, main winding evenly be covered with outward several identical to the number of turn, around to the shielding winding opposite, that the position is relative, the shielding winding coupling is together.
The utility model also is provided with layer insulation and external insulation, between main winding and shielding winding layer insulation is set, and in shielding winding outside external insulation is set.
Said iron core is the ultracrystallite iron core.
Adopt the utility model, on the iron core around on main insulation, outside main winding, evenly be covered with several identical to the number of turn, around to the shielding winding opposite, that the position is relative, to shield winding coupling together, the electromotive force that main flux is responded to is therein cancelled each other, and utilizes and to return the external magnetic field that conductor produces, and the electrical potential difference that difference produced of the magnetic flux that produces at the iron core each several part forms circulation, to reduce the influence of stray flux, prevent from the defective phenomenon of error to occur because of local magnetic bias appears in iron core.
When design shielding winding, to consider the circulation size, select suitable lead, prevent that temperature rise is too high.
The beneficial effects of the utility model are: novel structure, reduce the external magnetic field influence, prevent local magnetic bias, solved the instrument safety coefficient little with the contradiction of rated primary current between greatly, the product certainty of measurement reaches the 0.2S level, instrument safety coefficient FS is smaller or equal to 5.
Description of drawings:
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is that shielding winding of the present utility model connects schematic diagram;
Fig. 3 is a cutaway view of the present utility model.
Among the figure: iron core 1, core insulation 2, main winding 3, layer insulation 4, shielding winding 5, external insulation 6.
Embodiment:
Below in conjunction with accompanying drawing, the utility model is described in further detail by embodiment.
A kind of anti-local bias current instrument transformer secondary winding structure, comprise iron core 1, core insulation 2, main winding 3, shielding winding 5, twine main insulation on the iron core, main insulation is provided with main winding outward, main winding evenly be covered with outward several identical to the number of turn, around to the shielding winding opposite, that the position is relative, the shielding winding coupling is together.The utility model also is provided with layer insulation 4 and external insulation 6, between main winding and shielding winding layer insulation is set, and in shielding winding outside external insulation is set.Said iron core is the ultracrystallite iron core.
In the present embodiment main winding evenly be covered with outward two identical to (A, B, C, D) number of turn, around to the shielding winding opposite, that the position is relative, the shielding winding coupling is together.Around upper core insulation 2, again around last main winding 3, interlayer is around last interlayer insulation 4 on the iron core 1 of suitable size, and main winding is outward again around last two pairs of shielding windings 5, and will shield winding and link together by Fig. 2, gets final product around last external insulation 6 outside the shielding winding.
Adopt the utility model, on the iron core around on main insulation, outside main winding, evenly be covered with several identical to the number of turn, around to the shielding winding opposite, that the position is relative, to shield winding coupling together, the electromotive force that main flux is responded to is therein cancelled each other, utilize external magnetic field to form circulation,, prevent local magnetic bias to reduce the influence of stray flux in the electrical potential difference that difference produced of the magnetic flux of iron core each several part generation.
Claims (3)
1. prevent local bias current instrument transformer secondary winding structure for one kind, it is characterized in that comprising iron core (1), core insulation (2), main winding (3), shielding winding (5), twine main insulation on the iron core, main insulation is provided with main winding outward, main winding evenly be covered with outward several identical to the number of turn, around to the shielding winding opposite, that the position is relative, the shielding winding coupling is together.
2. the anti-local bias current instrument transformer secondary winding structure according to claim 1 is characterized in that also being provided with layer insulation (4) and external insulation (6), between main winding and shielding winding layer insulation is set, and in shielding winding outside external insulation is set.
3. according to claim 1 or 2 described anti-local bias current instrument transformer secondary winding structures, it is characterized in that said iron core is the ultracrystallite iron core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206416535U CN201877277U (en) | 2010-12-06 | 2010-12-06 | Secondary winding structure for local magnetic biasing prevention current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206416535U CN201877277U (en) | 2010-12-06 | 2010-12-06 | Secondary winding structure for local magnetic biasing prevention current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201877277U true CN201877277U (en) | 2011-06-22 |
Family
ID=44165190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206416535U Expired - Fee Related CN201877277U (en) | 2010-12-06 | 2010-12-06 | Secondary winding structure for local magnetic biasing prevention current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201877277U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050265A (en) * | 2012-12-31 | 2013-04-17 | 常熟开关制造有限公司(原常熟开关厂） | Residual current transformer |
| CN103137312A (en) * | 2011-11-22 | 2013-06-05 | Abb技术有限公司 | Current transformer |
| CN111693769A (en) * | 2019-03-15 | 2020-09-22 | 宁波三星智能电气有限公司 | Electric energy meter |
| CN111830300A (en) * | 2019-04-23 | 2020-10-27 | 宁波三星智能电气有限公司 | Electric energy meter |
-
2010
- 2010-12-06 CN CN2010206416535U patent/CN201877277U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103137312A (en) * | 2011-11-22 | 2013-06-05 | Abb技术有限公司 | Current transformer |
| EP2597658A3 (en) * | 2011-11-22 | 2017-12-06 | ABB Schweiz AG | Current transformer |
| CN103050265A (en) * | 2012-12-31 | 2013-04-17 | 常熟开关制造有限公司(原常熟开关厂） | Residual current transformer |
| CN111693769A (en) * | 2019-03-15 | 2020-09-22 | 宁波三星智能电气有限公司 | Electric energy meter |
| CN111830300A (en) * | 2019-04-23 | 2020-10-27 | 宁波三星智能电气有限公司 | Electric energy meter |
| CN111830300B (en) * | 2019-04-23 | 2023-08-18 | 宁波三星智能电气有限公司 | Electric energy meter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110622 Termination date: 20131206 |