CN201877278U - Secondary winding element structure for current transformers - Google Patents
Secondary winding element structure for current transformers Download PDFInfo
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- CN201877278U CN201877278U CN2010206416785U CN201020641678U CN201877278U CN 201877278 U CN201877278 U CN 201877278U CN 2010206416785 U CN2010206416785 U CN 2010206416785U CN 201020641678 U CN201020641678 U CN 201020641678U CN 201877278 U CN201877278 U CN 201877278U
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- secondary winding
- level secondary
- protected
- measuring
- element structure
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Abstract
The utility model relates to a secondary winding element structure for current transformers, in particular to a secondary winding element structure for large current transformers, which belongs to the technical field of transformer fabrication. The technical scheme is that: the secondary winding element structure comprises a measurement level secondary winding (1) and protection level secondary windings, and the protection level secondary windings are respectively placed on the upper side, the lower side and the outer side of the measurement level secondary winding to shield the measurement level secondary winding. The utility model has the advantages that: the structure is novel, the cost is low, the affection of an external magnetic field on the measurement level secondary winding is decreased, the phenomenon of an unacceptable error caused by the local saturation of a core is prevented, the contradiction between the small instrument security factor and the high rated primary current is solved, the product measurement precision reaches the level of 0.2S, and the instrument security factor FS is less than or equal to 5.
Description
Technical field:
The utility model relates to a kind of secondary winding in current transformer group structure, particularly large-current electric current transformer secondary winding group, 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, the requirement of instrument safety coefficient is often arranged again, measuring level secondary winding core dimensions this moment can be very little, because of returning the conductor influence, can local magnetic bias appear in iron core, make near the very fast growth of iron core magnetic flux density of returning conductor one side, error strengthens rapidly, causes measurement level secondary winding error defective.
The utility model content:
The utility model purpose provides a kind of secondary winding in current transformer group 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 secondary winding in current transformer group structure comprises and measures a level secondary winding, protected level secondary winding, measure the level secondary winding up and down and the outside respectively place at least one protected level secondary winding, will measure a grade secondary winding and shield.
Measure the level secondary winding and adopt the ultracrystallite iron core; one or two measure the level secondary winding above place protected level secondary winding above at least one; measure the level secondary winding below place protected level secondary winding below at least one, place at least one outside protected level secondary winding in the outside of measuring the level secondary winding.
The internal diameter of top protected level secondary winding and below protected level secondary winding is not more than the internal diameter of measuring the level secondary winding, and external diameter is not less than the external diameter of measuring the level secondary winding; The height of outside protected level secondary winding is not less than the height of measuring the level secondary winding.Like this protected level secondary winding just will measure the level secondary winding shield, reduced the influence of external magnetic field to it.
Adopt the utility model; because of current transformer protected level secondary winding quantity generally many; under the prerequisite that does not increase cost; just changed the arrangement mode of secondary winding into; measure the level secondary winding up and down and the outside respectively place at least one protected level secondary winding and will measure a grade secondary winding and shield; to reduce external magnetic field to measuring the influence of level secondary winding; prevent because of the local saturated underproof phenomenon of error that occurs of iron core; measure level secondary winding iron core and adopt the ultracrystallite iron core, guarantee to measure level secondary winding instrument safety coefficient FS smaller or equal to 5.
The beneficial effects of the utility model are: novel structure, cost is low, reduce external magnetic field to measuring the influence of level secondary winding, prevent because of the local saturated underproof phenomenon of error that occurs of iron core, solved the contradiction of the little and rated primary current of instrument safety coefficient between big, the product certainty of measurement reaches the 0.2S level, and instrument safety coefficient FS is smaller or equal to 5.
Description of drawings:
Fig. 1 is the structural representation of the utility model embodiment one;
Fig. 2 is the structural representation of the utility model embodiment two;
Among the figure: measure level secondary winding 1, iron core 2, top protected level secondary winding 3, below protected level secondary winding 4, outside protected level secondary winding 5.
Embodiment:
Below in conjunction with accompanying drawing, the utility model is described in further detail by embodiment.
Embodiment one; with reference to accompanying drawing 1, a kind of secondary winding in current transformer group structure comprises and measures level secondary winding 1, protected level secondary winding; measure the level secondary winding up and down and the outside respectively place at least one protected level secondary winding, will measure a grade secondary winding and shield.Measure level secondary winding 1 and adopt ultracrystallite iron core 2; one or two measure level secondary winding 1 above place protected level secondary winding 3 above at least one; measure level secondary winding 1 below place protected level secondary winding 4 below at least one, place at least one outside protected level secondary winding 5 in the outside of measuring level secondary winding 1.The internal diameter of top protected level secondary winding 3 and below protected level secondary winding 4 is not more than the internal diameter of measuring level secondary winding 1, and external diameter is not less than the external diameter of measuring level secondary winding 1; The height of outside protected level secondary winding 5 is not less than the height of measuring level secondary winding 1.Like this protected level secondary winding just will measure the level secondary winding shield, reduced the influence of external magnetic field to it.
Embodiment one, and the height of outside protected level secondary winding 5 is greater than the height of measuring level secondary winding 1.
Embodiment two; with reference to accompanying drawing 2; the height of outside protected level secondary winding 5 equals to measure the height of grade secondary winding 1, and the internal diameter of top protected level secondary winding 3 and below protected level secondary winding 4 is not more than the internal diameter of measuring level secondary winding 1, and external diameter is greater than the external diameter of measuring level secondary winding 1.
Claims (3)
1. secondary winding in current transformer group structure; it is characterized in that comprising a measurement level secondary winding (1), protected level secondary winding; measure the level secondary winding up and down and the outside respectively place at least one protected level secondary winding, will measure a grade secondary winding and shield.
2. the secondary winding in current transformer group structure according to claim 1; it is characterized in that measuring level secondary winding (1) and adopt ultracrystallite iron core (2); place at least one top protected level secondary winding (3) in one or two top of measuring level secondary winding (1); place at least one below protected level secondary winding (4) in the below of measuring level secondary winding (1), place at least one outside protected level secondary winding (5) in the outside of measuring level secondary winding (1).
3. the secondary winding in current transformer group structure according to claim 2, the internal diameter that it is characterized in that top protected level secondary winding (3) and below protected level secondary winding (4) is not more than the internal diameter of measuring level secondary winding (1), and external diameter is not less than the external diameter of measuring level secondary winding (1); The height of outside protected level secondary winding (5) is not less than the height of measuring level secondary winding (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206416785U CN201877278U (en) | 2010-12-06 | 2010-12-06 | Secondary winding element structure for current transformers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206416785U CN201877278U (en) | 2010-12-06 | 2010-12-06 | Secondary winding element structure for current transformers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201877278U true CN201877278U (en) | 2011-06-22 |
Family
ID=44165191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206416785U Expired - Lifetime CN201877278U (en) | 2010-12-06 | 2010-12-06 | Secondary winding element structure for current transformers |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201877278U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074344A (en) * | 2010-12-06 | 2011-05-25 | 保定天威集团有限公司 | Secondary winding group structure of current transformer |
| CN107170563A (en) * | 2017-05-09 | 2017-09-15 | 中国电力科学研究院 | A kind of current transformer and its method for self-calibrating with self-calibration function |
-
2010
- 2010-12-06 CN CN2010206416785U patent/CN201877278U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074344A (en) * | 2010-12-06 | 2011-05-25 | 保定天威集团有限公司 | Secondary winding group structure of current transformer |
| CN107170563A (en) * | 2017-05-09 | 2017-09-15 | 中国电力科学研究院 | A kind of current transformer and its method for self-calibrating with self-calibration function |
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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: 20110622 Effective date of abandoning: 20120905 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20110622 Effective date of abandoning: 20120905 |