CN2578948Y - Large current mutual inductor for 600MW power generator - Google Patents
Large current mutual inductor for 600MW power generator Download PDFInfo
- Publication number
- CN2578948Y CN2578948Y CN 02260573 CN02260573U CN2578948Y CN 2578948 Y CN2578948 Y CN 2578948Y CN 02260573 CN02260573 CN 02260573 CN 02260573 U CN02260573 U CN 02260573U CN 2578948 Y CN2578948 Y CN 2578948Y
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- mutual inductor
- current mutual
- secondary winding
- utility
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Abstract
The utility model relates to a large current mutual inductor, which is used for metering, measuring and protecting phase wire outlets and a center point earth terminal of a 600 MW power generator. The utility model, a large current mutual inductor for a 600 MW power generator comprises a secondary winding 4 which is arranged on an insulating plate 2 and is provided with an iron core 3. The utility model is characterized in that the exterior of the secondary winding 4 is also provided with shield windings 5 which are symmetrically distributed outside the secondary winding 4 and are composed of one pair to eight pairs of parallel windings. The utility model can effectively lighten the product weight, lower the interference of adjacent phases, and improve the measuring accuracy of the current mutual inductor.
Description
Technical field
The utility model relates to a kind of great current mutual inductor, is used to measure metering, measurement and the protection of phase outlet of 600MW generator and centre-point earth end.
Technical background
The rated current of high-rating generator is very big, rated current as the 300MW generator is 12000A～15000A, the rated current of 600MW generator is 25000A～28000A, phase spacing only is about 1 meter, the magnetic field of each phase current is very strong to the effect of ring current transformer on the adjacent phase sleeve pipe, cause the current transformer certainty of measurement poor, therefore must take shielding measure.The great current mutual inductor that is used for the 300MW generator at present all adopts the copper shell to shield, and Heavy Weight has limited the quantity of generator outlet place lifting current transformer.The rated current and the overall dimension of great current mutual inductor that is used for the 600MW generator is more much bigger than the matched current transformer of 300MW generator, if adopt the copper shell to shield, not only brings difficulty to lifting, but also can influence the safe operation of generator.
Summary of the invention
The utility model has overcome the heavy defective of product weight that existing great current mutual inductor adopts the shielding of copper shell to bring, a kind of new great current mutual inductor that is used for the 600MW generator is provided, this great current mutual inductor adopts the shielding winding, can alleviate product weight effectively, reduce the neighbour and disturb mutually, improve the certainty of measurement of current transformer.
The utility model is achieved in that a kind of great current mutual inductor of the 600MW of being used for generator, comprise the secondary winding that is contained in ribbon core on the insulation board, it is characterized in that also being equipped with outside secondary winding the shielding winding, it is outer and be made up of to eight pairs of windings in parallel a pair of that the shielding winding is symmetrically distributed in secondary winding.
Operation principle of the present utility model is to adopt the shielding winding to avoid the influence of adjacent phase current magnetic field to current transformer, because the effect of shielding winding, the close pressure of magnetic of uneven distribution in the iron core in the current transformer is evenly distributed, constant to keep main flux, effectively great current mutual inductor is reduced to lowest range in the operating interphase interference of three-phase system, guarantees the certainty of measurement and the reliability service of product.The shielding winding is in light weight than the shielding of copper shell, and cost is low, and volume is little, and is easy for installation.The principle of shielding winding as shown in Figure 3 because the existence of adjacent phase current makes the magnetic flux density of current transformer core that variation take place, the stray flux of adjacent phase current enters current transformer core by a point, divides two-way to converge to the outflow of b point through iron core both sides semicircle.The shielding winding is formed winding segments in parallel by being symmetrically distributed in outer several of secondary winding, and the composition that is connected in parallel independently shields winding.When increasing near adjacent phase current magnetic potential on one side, the induced current Ig that produces in one section of its shielding winding will produce an anti-magnetic potential (IgWg) and weaken original magnetic flux, make the close reduction of the magnetic that is increased.When weakening away from adjacent phase current magnetic potential on one side, the induced current Ig that produces in its one section of winding of shielding also will produce an anti-magnetic potential (IgWg) and strengthen original magnetic flux, make the close raising of the magnetic that is reduced, the magnetic flux of inequality is responded to circulation in every pair of shielding winding segments like this, the demagnetizing effect of circulation ampere-turn has been offset portion of external and has been disturbed magnetic flux, the close pressure of the magnetic of uneven distribution evenly distributes in the iron core thereby make, and plays the effect of shielding.
Description of drawings
Fig. 1 is used for the structural representation of the great current mutual inductor of 600MW generator for the utility model, and Fig. 2 is that A-A is to cross-sectional schematic among Fig. 1, and Fig. 3 is a pair of shielding winding schematic diagram.
Among the figure: 1 terminal box, 2 insulation boards, 3 iron cores, 4 secondary winding, 5 shielding windings, 6 conductors.
Execution mode
Referring to Fig. 1, Fig. 2, a kind of great current mutual inductor that is used for the 600MW generator, comprise the secondary winding 4 and the shielding winding 5 that are contained in ribbon core 3 on the insulation board 2, secondary winding 4 loopings are outside iron core 3, shielding winding 5 also is housed outside secondary winding 4, shielding winding 5 is symmetrically distributed in outside the secondary winding 4 and by a pair of to be formed to eight pairs of windings in parallel, and shielding winding 5, secondary winding 4 and iron core 3 are fixedly mounted on the insulation board 2, and the outlet of winding is by terminal box 1 output.Present embodiment shielding winding 5 adopts four pairs of windings in parallel.
Claims (1)
1. great current mutual inductor that is used for the 600MW generator, comprise and be contained in the secondary winding (4) that insulation board (2) is gone up ribbon core (3), it is characterized in that also being equipped with outside secondary winding (4) shielding winding (5), it is outer and be made up of to eight pairs of windings in parallel a pair of that shielding winding (5) is symmetrically distributed in secondary winding (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02260573 CN2578948Y (en) | 2002-10-09 | 2002-10-09 | Large current mutual inductor for 600MW power generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02260573 CN2578948Y (en) | 2002-10-09 | 2002-10-09 | Large current mutual inductor for 600MW power generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2578948Y true CN2578948Y (en) | 2003-10-08 |
Family
ID=33727600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02260573 Expired - Lifetime CN2578948Y (en) | 2002-10-09 | 2002-10-09 | Large current mutual inductor for 600MW power generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2578948Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101477157B (en) * | 2009-01-19 | 2012-05-02 | 清华大学 | Test method for anti-interference capability of great current mutual inductor with balance winding |
| CN103137312A (en) * | 2011-11-22 | 2013-06-05 | Abb技术有限公司 | Current transformer |
| CN107146692A (en) * | 2017-07-12 | 2017-09-08 | 无锡晶磊电子有限公司 | High frequency three-phase reactor |
-
2002
- 2002-10-09 CN CN 02260573 patent/CN2578948Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101477157B (en) * | 2009-01-19 | 2012-05-02 | 清华大学 | Test method for anti-interference capability of great current mutual inductor with balance winding |
| CN103137312A (en) * | 2011-11-22 | 2013-06-05 | Abb技术有限公司 | Current transformer |
| CN107146692A (en) * | 2017-07-12 | 2017-09-08 | 无锡晶磊电子有限公司 | High frequency three-phase reactor |
| CN107146692B (en) * | 2017-07-12 | 2018-11-30 | 无锡晶磊电子有限公司 | High frequency three-phase reactor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHANGHAI MWB TRANSFORMER CO., LTD. Free format text: FORMER OWNER: SHANGHAI MUTUAL INDUCTOR FACTORY, SHANGHAI ELECTRICAL (GROUP) Effective date: 20050603 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20050603 Address after: 200245 No. 3658, Jiangcheng Road, Shanghai, Minhang District Patentee after: Trench China MWB (Shanghai) Co., Ltd. Address before: 200245 Shanghai city Minhang District Huang Ping Lu No. 160 Patentee before: Shanghai Mutual Inductor Factory, Shanghai Electrical (Group) |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20121009 Granted publication date: 20031008 |