CN2580578Y - Current mutual inductor of generator main loop - Google Patents
Current mutual inductor of generator main loop Download PDFInfo
- Publication number
- CN2580578Y CN2580578Y CN 02280629 CN02280629U CN2580578Y CN 2580578 Y CN2580578 Y CN 2580578Y CN 02280629 CN02280629 CN 02280629 CN 02280629 U CN02280629 U CN 02280629U CN 2580578 Y CN2580578 Y CN 2580578Y
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- CN
- China
- Prior art keywords
- iron core
- generator main
- current
- winding
- loop
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- Expired - Fee Related
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Abstract
The utility model discloses a current mutual inductor of a generator main loop. A current mutual inductor for transient based protection is arranged in the generator main loop and is composed of an iron core, a secondary winding which is arranged outside the iron core, an insulating medium which is arranged outside the secondary winding, and a metal outer casing which is arranged outside the insulating medium, wherein, an iron core air gap is arranged on the iron core and cuts the iron core into an iron core with an opening, which increases the section area of the iron core; a shielding winding is arranged between the iron core and the secondary winding. The utility model solves the problems of transient saturation, residual magnetism, and the interference from an external magnetic field, which is generated by that a generator has an over high current; the utility model has favorable insulating property and humidity resistance capability, guarantees that the mutual inductor can exactly reflect the changes of a primary current, and enables an overload protection device to act precisely besides high precision and safe operation.
Description
Technical field
The utility model relates to a kind of current transformer, relates in particular to a kind of generator main current in loop instrument transformer.
Background technology
At present, the current transformer that uses in the generator main loop is the current transformer of stable state protection, and class of accuracy is 5P level and 10P level.When in a single day the steady-state current instrument transformer was short-circuited fault in system, transient state magnetic flux and remanent magnetism is very big can't accurately to be reflected the variation of first short circuit electric current and makes the differential protection misoperation, thereby has influenced the normal operation of generator, causes very big loss.Along with continuing to increase of generating set capacity; by 300MW until 750MW; the time constant of system's first short circuit current dc component is increasing, and shortening the operate time of claimed device, and the current transformer of stable state protection can't address the above problem.
The utility model content
Technical problem to be solved in the utility model provides a kind of generator main current in loop instrument transformer, and the situation of change of its energy accurate response primary current can make the protective relaying device precision maneuver.
Be achieved in that the current transformer that transient protection is set in order to solve the problems of the technologies described above the utility model in the generator main loop; the current transformer of transient protection is by iron core; outside winding unshakable in one's determination; the winding outside is provided with secondary winding; the dielectric of secondary winding outer setting, and the metal shell of dielectric outer setting is formed.Air gap unshakable in one's determination wherein is set on iron core, with incision iron core unshakable in one's determination, increases sectional area unshakable in one's determination, outside winding unshakable in one's determination adopts the shielding winding.
This current transformer has solved the saturated and remanent magnetism problem of transient state, and generator super-high-current and the external magnetic field interference problem that produces has good insulation performance performance and humidity resistance.Guaranteed the situation of change of instrument transformer energy accurate response primary current, can make the protective relaying device precision maneuver.Adopted shield technology, the precision of the current transformer of transient protection is improved, safe and reliable, cost is low, is beneficial to enforcement.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Fig. 1 is the structural representation of the utility model generator main current in loop instrument transformer.
Fig. 2 is the structural representation of the utility model generator main current in loop instrument transformer iron core and secondary winding.
Embodiment
Fig. 1 is a structural representation of the present utility model.The current transformer of transient protection is set in the generator main loop; the current transformer of transient protection is by iron core 7, is arranged on the winding of 7 outsides unshakable in one's determination, and the winding outside is provided with secondary winding 3; secondary winding 3 outsides are provided with dielectric 2, and the metal shell 1 of dielectric 2 outsides is formed.On unshakable in one's determination 7 air gap 8 unshakable in one's determination is set, with 7 incision iron cores unshakable in one's determination, increases unshakable in one's determination 7 sectional area, area of core section was 5-15cm when generating set capacity was 300MW
2, air gap 8 width unshakable in one's determination are 2-6mm; When generating set capacity was 600MW, area of core section was 40-55cm
2, air gap 8 width unshakable in one's determination are 2-8mm.Increasing according to different 7 sectional areas unshakable in one's determination of generating set capacity is original 1.5-2.5 times.In air gap 8 unshakable in one's determination insulation board 9 is set, the width of insulation board 9 and width of air gap unshakable in one's determination are complementary, and insulation board 9 can be for tabular.Dielectric 2 can be epoxy resin, silicon rubber, makes instrument transformer have good insulation performance performance and humidity resistance.Metal shell 1 adopts shield technology.
Fig. 2 is the structural representation of the utility model generator main current in loop instrument transformer iron core and secondary winding.Secondary winding 3 is made up of the buffering insulating material 4 of secondary coil 5 and secondary coil 5 outsides.The winding of 7 outsides unshakable in one's determination has adopted shielding winding 6, can guarantee the precision of instrument transformer.
Claims (5)
1. generator main current in loop instrument transformer; it is characterized in that being provided with in the generator main loop current transformer of band transient protection; the current transformer of band transient protection characteristic is by (7) unshakable in one's determination; be arranged on the outside winding of iron core (7); the winding outside is provided with secondary winding (3); secondary winding (3) outside is provided with dielectric (2), and the metal shell (1) of dielectric (2) outer setting composition, and wherein (7) unshakable in one's determination are provided with air gap unshakable in one's determination (8).
2. according to the described generator main current in loop of claim 1 instrument transformer, it is characterized in that it is original 1.5-2.5 times that described iron core (7) sectional area increases.
3. according to the described generator main current in loop of claim 1 instrument transformer, it is characterized in that the outside winding of described iron core (7) adopts shielding winding (6).
4. according to the described generator main current in loop of claim 1 instrument transformer, it is characterized in that described metal shell (1) adopts shielded metal case.
5. according to the described generator main current in loop of claim 1 instrument transformer, it is characterized in that being provided with in the described air gap unshakable in one's determination (8) insulation board (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02280629 CN2580578Y (en) | 2002-10-22 | 2002-10-22 | Current mutual inductor of generator main loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02280629 CN2580578Y (en) | 2002-10-22 | 2002-10-22 | Current mutual inductor of generator main loop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2580578Y true CN2580578Y (en) | 2003-10-15 |
Family
ID=33743312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02280629 Expired - Fee Related CN2580578Y (en) | 2002-10-22 | 2002-10-22 | Current mutual inductor of generator main loop |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2580578Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100454453C (en) * | 2005-03-10 | 2009-01-21 | 上海Mwb互感器有限公司 | Low-power electronic current mutual inductor |
| CN102360892A (en) * | 2011-10-25 | 2012-02-22 | 保定天威集团有限公司 | Current mutual inductor |
-
2002
- 2002-10-22 CN CN 02280629 patent/CN2580578Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100454453C (en) * | 2005-03-10 | 2009-01-21 | 上海Mwb互感器有限公司 | Low-power electronic current mutual inductor |
| CN102360892A (en) * | 2011-10-25 | 2012-02-22 | 保定天威集团有限公司 | Current mutual inductor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |