CN103680901A - Double-shielded dry type mutual inductor - Google Patents
Double-shielded dry type mutual inductor Download PDFInfo
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- CN103680901A CN103680901A CN201210358547.XA CN201210358547A CN103680901A CN 103680901 A CN103680901 A CN 103680901A CN 201210358547 A CN201210358547 A CN 201210358547A CN 103680901 A CN103680901 A CN 103680901A
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- mutual inductor
- dry type
- electric stress
- layer
- type mutual
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Abstract
The invention discloses a double-shielded dry type mutual inductor. The double-shielded dry type mutual inductor comprises an iron core, a sleeve, an insulating layer, an insulation sealing tube, a silicone rubber umbrella skirt, a grounding electrode, a shell, a secondary winding and an electric stress relieving layer. The electric stress relieving layer is arranged outside the insulating layer, the root portion of the electric stress relieving layer is connected with the grounding electrode, and at least one layer of shielded coil is arranged outside the secondary winding. By means of the double-shielded dry type mutual inductor, the problem that voltage distribution along the surface of a high-tension current inductor is uneven can be effectively solved, discharge voltages along the surface are increased substantially, the strong electromagnetic field interference problem of a large current main loop is solved, the structure is simple, the performance is reliable, by the adoption of the shielded coil, the shielding effect which is superior to the effect of a high conductivity metal shell abroad can be achieved only by using a common metal shell, and the function for protection of the mutual inductor can be further achieved through the metal shell.
Description
Technical field
The present invention relates to a kind of instrument transformer, relate in particular to a kind of double shield dry type mutual inductor.
Background technology
Along with the development of China's electric utility, because the loop current of this great Rong hair updo group of motors is large, and often nearer separately, therefore can produce very strong electric Hui Chang, if magnetic field shielding is not fallen, not only to 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 started to write and outer adopt protection to retouch to execute at electric current mutual connection, 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 not only requiring it, this screening can there is higher metal purity and conductance, and to possess suitable thickness, this is very high to the requirement of cost and smelting technique, need in insulating barrier, by pre-designed position, embed the metal foil electrode that is called as capacitance plate, insulation thickness between every two-layer capacitance plate is different, conventionally only has a few tenths of a mm.Like this, in whole current transformer insulation, need to embed a lot of capacitance plates, be unfavorable for the mechanization production of current transformer.
Summary of the invention
Object of the present invention provides a kind of simple in structure, safe and reliable double shield dry type mutual inductor with regard to being in order to address the above problem.
The present invention is achieved through the following technical solutions above-mentioned purpose:
The present invention includes iron core, sleeve pipe, insulating barrier, insulated enclosure pipe, silicon rubber full skirt, earth electrode, housing, secondary winding and electric stress eliminating layer, 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 the shielded coil of at least one layer outward.
Concrete, the coaxial pipe that 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.
As preferentially, the two ends of described earth electrode are the horn-like below that extends to the root of electric stress eliminating layer, adopt after this structure, are more conducive to improve near Electric Field Distribution earth electrode.
Further, described housing side is provided with one or more louvre.
Concrete, the radius of described silicon rubber full skirt from top to bottom increases successively gradually.
Beneficial effect of the present invention is:
The present invention 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 shielded coil, like this as long as will reach with common metal shell the shield effectiveness that is better than external high conductivity metal shell, and metal shell itself can play again the effect of protection instrument transformer.
Accompanying drawing explanation
Fig. 1 is half sectional view of the present invention.
In 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-housing, 11-louvre.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1, the present invention includes iron core 1, sleeve pipe 2, insulating barrier 3, insulated enclosure pipe 5, silicon rubber full skirt 6, earth electrode 7, housing 10, secondary winding 8 and electric stress eliminating layer 4, electric stress eliminating layer 4 is arranged on the outside at insulating barrier 3, the root of electric stress eliminating layer 4 is connected with earth electrode 7, the outer shielded coil 9 that arranges at least one layer of secondary winding 8.
As shown in Figure 1, if the mechanical strength of insulating barrier 3 is poor, the rigidity tubing that sleeve pipe 2 can adopt is non-magnetic, have semiconductive coating, if the mechanical strength of insulating barrier 3 is enough, sleeve pipe 2 can adopt semiconductive material directly to contact with the inner surface of insulating barrier 3 with the outer surface of iron core 1.Insulating barrier 3 should select the material that dielectric strength is high to make.Outside insulating barrier 3, install electric stress eliminating layer 4, electric stress eliminating layer 4 is made by the insulating material of high-k, and stress-relieving interlayer 4 can be shorter than insulating barrier 3, not necessarily will extend to insulating barrier 3.
As shown in Figure 1, the coaxial pipe that electric stress eliminating layer 4 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.The two ends of earth electrode 7 are the outside that bell mouth shape extends to the root of electric stress eliminating layer.Housing 10 sides are provided with one or more louvre 11.The radius of silicon rubber full skirt 6 from top to bottom increases successively gradually.A little less than surface charge build-up effect, can guarantee that solid insulation is not because interface charge accumulation punctures.
Claims (5)
1. a double shield dry type mutual inductor, comprise the compositions such as iron core, sleeve pipe, insulating barrier, insulated enclosure pipe, silicon rubber full skirt, earth electrode, housing and secondary winding, it is characterized in that: also comprise electric stress eliminating layer, 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 the shielded coil of at least one layer outward.
2. a kind of double shield dry type mutual inductor as claimed in claim 1, is characterized in that: the coaxial pipe that described 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 as claimed in claim 1, is characterized in that: the two ends of described earth electrode are the horn-like below that extends to described electric stress eliminating layer root.
4. a kind of double shield dry type mutual inductor as claimed in claim 1, is characterized in that: described housing side is provided with one or more louvre.
5. a kind of double shield dry type mutual inductor 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 |
|---|---|---|---|
| CN201210358547.XA CN103680901A (en) | 2012-09-25 | 2012-09-25 | Double-shielded dry type mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210358547.XA CN103680901A (en) | 2012-09-25 | 2012-09-25 | Double-shielded dry type mutual inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103680901A true CN103680901A (en) | 2014-03-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210358547.XA Pending CN103680901A (en) | 2012-09-25 | 2012-09-25 | Double-shielded dry type mutual inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103680901A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4471333A (en) * | 1981-04-28 | 1984-09-11 | Sprecher & Schuh Ag | Current transformer with a ring-shaped core for use in a high voltage switching device enclosed in a metallic casing |
| CN2497415Y (en) * | 2001-03-05 | 2002-06-26 | 方静 | Dry-type high-voltage current transformer |
| CN202855527U (en) * | 2012-08-29 | 2013-04-03 | 成都槟果科技有限公司 | Double-shielded dry type mutual inductor with overvoltage protector |
| CN202930193U (en) * | 2012-09-25 | 2013-05-08 | 成都博课启睿科技有限公司 | Double-shielded dry-type mutual inductor |
-
2012
- 2012-09-25 CN CN201210358547.XA patent/CN103680901A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4471333A (en) * | 1981-04-28 | 1984-09-11 | Sprecher & Schuh Ag | Current transformer with a ring-shaped core for use in a high voltage switching device enclosed in a metallic casing |
| CN2497415Y (en) * | 2001-03-05 | 2002-06-26 | 方静 | Dry-type high-voltage current transformer |
| CN202855527U (en) * | 2012-08-29 | 2013-04-03 | 成都槟果科技有限公司 | Double-shielded dry type mutual inductor with overvoltage protector |
| CN202930193U (en) * | 2012-09-25 | 2013-05-08 | 成都博课启睿科技有限公司 | Double-shielded dry-type mutual inductor |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140326 |