CN202855527U - Double-shielded dry type mutual inductor with overvoltage protector - Google Patents
Double-shielded dry type mutual inductor with overvoltage protector Download PDFInfo
- Publication number
- CN202855527U CN202855527U CN 201220432650 CN201220432650U CN202855527U CN 202855527 U CN202855527 U CN 202855527U CN 201220432650 CN201220432650 CN 201220432650 CN 201220432650 U CN201220432650 U CN 201220432650U CN 202855527 U CN202855527 U CN 202855527U
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- China
- Prior art keywords
- mutual inductor
- protection device
- overcurrent protection
- dry type
- overvoltage protector
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Abstract
The utility model discloses a double-shielded dry type mutual inductor with an overvoltage protector. The double-shielded dry type mutual inductor with the overvoltage protector comprises an iron core, a casing pipe, an insulating layer, an insulating sealing pipe, a silicon rubber umbrella skirt, an earth electrode, a shell body, a secondary winding, a compression spring, the overvoltage protector and an electrical stress eliminating layer. The overvoltage protector is integrally installed in the insulating sealing pipe. One end of the overvoltage protector is contacted with the compression spring in a cylinder inside the insulating sealing pipe. The other end of the overvoltage protector is fixedly connected with a bolt. The other end of the compression spring is fixed on the iron core. The electrical stress eliminating layer is tightly and closely installed outside the insulating layer. The root portion of the electrical stress eliminating layer is tightly and closely connected with the earth electrode. At least one layer of shielding coils is wound outside the secondary winding. According to the double-shielded dry type mutual inductor with the overvoltage protector, the problem that voltage along a surface of a high-tension current mutual inductor is not evenly distributed is effectively solved, discharge voltage along the surface is greatly improved, structure is simple, performance is reliable, due to the fact that the overvoltage protector is adopted, security coefficient of the mutual inductor is further improved, and replacement is convenient.
Description
Technical field
The utility model relates to a kind of instrument transformer, relates in particular to a kind of double shield dry type mutual inductor with the overcurrent protection device.
Background technology
Along with the development of China's electric utility, because the loop current of this Da Rong hair updo group of motors is large, and whenever nearer separately, therefore can produce very strong electric Hui Chang, if the magnetic field shielding is not fallen, not only to the instrument transformer serious interference, and affect measurement effect.In order to solve the strong-electromagnetic field interference problem of large electric current major loop, abroad some manufacturer has begun to write at the electric current mutual connection and outer adopts protection to retouch to execute, and for example the Westinghouse Electric of the U.S. is exactly that skin at instrument transformer has increased a metallic shield shell.But because this screening can not only requires it to have higher metal purity and conductance, and to possess suitable thickness, this requirement to cost and smelting technique is very high, need in insulating barrier, embed the metal foil electrode that is called as capacitance plate by pre-designed position, insulation thickness between every two-layer capacitance plate is different, usually only has a few tenths of a mm.Like this, need to embed a lot of capacitance plates in the whole current transformer insulation, be unfavorable for the mechanization production of current transformer.
Summary of the invention
The purpose of this utility model provides a kind of simple in structure with regard to being in order to address the above problem, the safe and reliable double shield dry type mutual inductor with the overcurrent protection device.
The utility model is achieved through the following technical solutions above-mentioned purpose:
The utility model comprises iron core; sleeve pipe; insulating barrier; the insulated enclosure pipe; the silicon rubber full skirt; earth electrode; housing; secondary winding; Compress Spring; flange; overcurrent protection device and electric stress eliminating layer; the integral installation of described overcurrent protection device is in described insulated enclosure pipe; Compress Spring in described overcurrent protection device one end and the described insulated enclosure pipe inner cylinder contacts; the described overcurrent protection device other end is fixedly connected with bolt; the other end of described Compress Spring is fixed on the described iron core; described electric stress eliminating layer is arranged on the outside of insulating barrier; the root of described electric stress eliminating layer is connected with earth electrode, and described secondary winding arranges at least one layer shielded coil outward.
Particularly, the coaxial pipe that the electric stress eliminating layer is made by n floor height permittivity dielectric material forms, and the dielectric constant of every layer of pipe equates or increases successively from inside to outside.
Particularly, the two ends of described earth electrode are the horn-like outside that extends to the root of electric stress eliminating layer.
Particularly, described housing side is provided with one or more louvre.
Particularly, the radius of described silicon rubber full skirt from top to bottom increases successively gradually.
The beneficial effects of the utility model are:
The utility model can efficiently solve high-tension current inductor along face voltage skewness problem; increased substantially creeping discharge voltage; solve the strong-electromagnetic field interference problem of large electric current major loop; simple in structure; dependable performance because it has adopted the overcurrent protection device, has further increased the coefficient of safety of instrument transformer; and simple in structure, it is convenient to change.
Description of drawings
Fig. 1 is half sectional view of the present utility model.
Among the figure: 1-iron core, 2-sleeve pipe, 3-insulating barrier, 4-electric stress eliminating layer, 5-insulated enclosure pipe, 6-silicon rubber full skirt, 7-earth electrode, 8-secondary winding, 9-shielded coil, 10-flange, 11-housing, 12-louvre, 13-Compress Spring, 14-overcurrent protection device.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing:
As shown in Figure 1; the utility model comprises iron core 1; sleeve pipe 2; insulating barrier 3; insulated enclosure pipe 5; silicon rubber full skirt 6; earth electrode 7; housing 11; secondary winding 8; Compress Spring 13; flange 10; overcurrent protection device 14 and electric stress eliminating layer 4; described overcurrent protection device 14 integral installations are in described insulated enclosure pipe 5; Compress Spring 13 in described overcurrent protection device 14 1 ends and described insulated enclosure pipe 5 inner cylinder contacts; described overcurrent protection device 14 other ends are fixedly connected with bolt; the other end of described Compress Spring 13 is fixed on the described iron core 1; described electric stress eliminating layer 4 is arranged on the outside of insulating barrier 3; the root of described electric stress eliminating layer 4 is connected with earth electrode 7, the described secondary winding 8 outer shielded coils 9 that arrange at least one layer.
As shown in Figure 1, the rigidity tubing that if the mechanical strength of insulating barrier 3 is relatively poor, that sleeve pipe 2 can adopt is non-magnetic, have the semiconductive coating; If the mechanical strength of insulating barrier 3 is enough, sleeve pipe 2 can adopt semiconductive material directly to contact with the outer surface of iron core 1 and the inner surface of insulating barrier 3.Insulating barrier 3 should select the high material of dielectric strength to make.
As shown in Figure 1, the coaxial pipe that electric stress eliminating layer 4 is made by n floor height permittivity dielectric material forms, the dielectric constant of every layer of pipe equates or increases successively from inside to outside, the two ends of described earth electrode 7 are the outside that bell mouth shape extends to the root of electric stress eliminating layer 4, described housing 11 sides are provided with one or more louvre 12, and the radius of described silicon rubber full skirt 6 from top to bottom increases successively gradually.
Claims (5)
1. double shield dry type mutual inductor with the overcurrent protection device; comprise iron core; sleeve pipe; insulating barrier; the insulated enclosure pipe; the silicon rubber full skirt; earth electrode; flange; housing and secondary winding; it is characterized in that: also comprise Compress Spring; overcurrent protection device and electric stress eliminating layer; the integral installation of described overcurrent protection device is in described insulated enclosure pipe; Compress Spring in described overcurrent protection device one end and the described insulated enclosure pipe inner cylinder contacts; the described overcurrent protection device other end is fixedly connected with bolt; the other end of described Compress Spring is fixed on the described iron core; described electric stress eliminating layer is arranged on the outside at insulating barrier; the root of described electric stress eliminating layer is connected with earth electrode, and described secondary winding arranges at least one layer shielded coil outward.
2. a kind of double shield dry type mutual inductor with the overcurrent protection device as claimed in claim 1; it is characterized in that: the coaxial pipe that the electric stress eliminating layer is made by n floor height permittivity dielectric material forms, and the dielectric constant of every layer of pipe equates or increases successively from inside to outside.
3. a kind of double shield dry type mutual inductor with the overcurrent protection device as claimed in claim 1, it is characterized in that: the two ends of described earth electrode are the horn-like outside that extends to the root of electric stress eliminating layer.
4. a kind of double shield dry type mutual inductor with the overcurrent protection device as claimed in claim 1, it is characterized in that: described housing side is provided with one or more louvre.
5. a kind of double shield dry type mutual inductor with the overcurrent protection device as claimed in claim 1 is characterized in that: the radius of described silicon rubber full skirt from top to bottom increases successively gradually.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220432650 CN202855527U (en) | 2012-08-29 | 2012-08-29 | Double-shielded dry type mutual inductor with overvoltage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220432650 CN202855527U (en) | 2012-08-29 | 2012-08-29 | Double-shielded dry type mutual inductor with overvoltage protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202855527U true CN202855527U (en) | 2013-04-03 |
Family
ID=47986698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220432650 Expired - Fee Related CN202855527U (en) | 2012-08-29 | 2012-08-29 | Double-shielded dry type mutual inductor with overvoltage protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202855527U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103680901A (en) * | 2012-09-25 | 2014-03-26 | 成都博课启睿科技有限公司 | Double-shielded dry type mutual inductor |
-
2012
- 2012-08-29 CN CN 201220432650 patent/CN202855527U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103680901A (en) * | 2012-09-25 | 2014-03-26 | 成都博课启睿科技有限公司 | Double-shielded dry type mutual inductor |
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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: 20130403 Termination date: 20130829 |