CN203983020U - Improve the high-insulativity current transformer of surface creepage distance - Google Patents
Improve the high-insulativity current transformer of surface creepage distance Download PDFInfo
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- CN203983020U CN203983020U CN201420361559.2U CN201420361559U CN203983020U CN 203983020 U CN203983020 U CN 203983020U CN 201420361559 U CN201420361559 U CN 201420361559U CN 203983020 U CN203983020 U CN 203983020U
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- primary winding
- current transformer
- containing cavity
- creepage distance
- terminal portions
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Abstract
The utility model relates to a kind of instrument transformer.Improve the high-insulativity current transformer of surface creepage distance, comprise a current transformer main body, current transformer main body comprises an insulation crust, insulation crust comprises the containing cavity of a fixed placement iron-core coil, also comprise primary winding terminal portions, primary winding terminal portions is positioned at the top of containing cavity, and primary winding terminal portions upper surface is embedded with two primary winding binding posts; Insulation crust also comprises secondary coil wire connecting portion, and secondary coil wire connecting portion is positioned at the forward right side of containing cavity bottom; Current transformer main body, also comprises secondary connection cover, the secondary connection cover secondary coil wire connecting portion that removably connects.The utility model has improved the creepage distance of primary winding terminal portions and secondary connection portion, has improved insulation stability.Realized the protection to secondary coil terminal portions by secondary connection cover, the control at interval primary winding binding post and the mutual creepage distance of secondary wiring terminals.
Description
Technical field
The utility model relates to a kind of instrument transformer, relates in particular to current transformer.
Background technology
Instrument transformer (instrument transformer) is the equipment of scaling transformation voltage or electric current.Its function is mainly that high voltage or large electric current scaling transformation are become to standard low-voltage (100V) or the little electric current of standard (5A or 10A; all refer to rated value), to realize standardization, the miniaturization of measuring instrument, protection equipment and automatic control equipment.Instrument transformer also can be used to separate high-voltage system simultaneously, to ensure the safety of the person and equipment, the equipment of scaling transformation voltage or electric current.
In the time that current transformer is carried out to structural design, creepage distance is one of factor of considering, and creepage distance is the beeline between two conductive parts that record along insulating surface or between conductive parts and equipment protection interface.Under different service conditions, because conductor insulating material is around by electric polarization, cause insulating material to present electrification phenomenon, the radius of this live zone is creepage distance.Between two conductive components, or conductive component and equipment and easily between contact surface along the shortest space length of insulating material surface measurement.Distance along insulating surface electric discharge is that leakage distance also claims creepage distance, is called for short creep distance.
Creep distance=surface distance/system ceiling voltage.For high-tension current inductor, tradition is often by the spacing of controlling between conductive component, such as, control the distance between binding post, thereby ensure that creepage spacing between conductive component is in prescribed limit, this just need to be in certain degree the external dimensions of control appliance, in traditional design, often adopt prolongation distance and realize, but simple prolongation distance tends to cause the increase of equipment volume, equipment uses increasing of mould material.
Utility model content
The purpose of this utility model is to provide a kind of high-insulativity current transformer that improves surface creepage distance, to solve above-mentioned at least one technical problem.
The technical problem that the utility model solves can realize by the following technical solutions:
Improve the high-insulativity current transformer of surface creepage distance, comprise a current transformer main body, it is characterized in that, described current transformer main body comprises an insulation crust, described insulation crust comprises the containing cavity of a fixed placement iron-core coil, also comprise primary winding terminal portions, described primary winding terminal portions is positioned at the top of described containing cavity, and described primary winding terminal portions upper surface is embedded with two primary winding binding posts;
Described insulation crust also comprises secondary coil wire connecting portion, and described secondary coil wire connecting portion is positioned at the forward right side of described containing cavity bottom;
Described current transformer main body, also comprises secondary connection cover, the described secondary connection cover described secondary coil wire connecting portion that removably connects.
The utility model, by be provided with primary winding terminal portions on traditional insulation crust, has improved the creepage distance of primary winding terminal portions and secondary connection portion, has improved insulation stability.Realized the protection to secondary coil terminal portions by described secondary connection cover, the control at interval primary winding binding post and the mutual creepage distance of secondary wiring terminals.
Described primary winding terminal portions outer wall is provided with at least one rectangular ring groove.By described rectangular ring groove, in the time of transport the utility model, can be fixed and move to take by described rectangular ring groove.Also can further save cast cost.
Described primary winding terminal portions outer wall is provided with twice rectangular ring groove; Described twice rectangular ring groove be arranged in parallel in short transverse;
The spacing of described twice rectangular ring groove is 5mm to 12mm.
Described primary winding terminal portions connects described container cavity by one described rectangular ring groove.
Described insulation crust below is provided with a metallic plate for ground connection, is fixed with earth stud on metallic plate.Improve the utility model insulation over the ground.
Distance between described primary winding binding post and described metallic plate is 280mm to 320mm, is preferably 305mm.Can effectively increase like this insulation level between primary winding binding post and ground.Can, with respect to original current transformer, not increase on the basis of the area occupied in horizontal direction again simultaneously, simple raising longitudinal length of the present utility model, thereby realize the prolongation of creepage distance.
Described primary winding terminal portions is a rectangular build pour mass, and the width of described rectangular build pour mass is less than the width of described containing cavity, and the length of described rectangular build pour mass is less than the length of described containing cavity.Be convenient to save mould material.
On described insulation crust, be also provided with a support portion, described support zone is in the below of described containing cavity, and described insulation crust connects described metallic plate by described support portion;
Described containing cavity, described metallic plate and described support portion three's right flank is all in same level, the left surface of described containing cavity and the left surface of described metallic plate are in same level, and the left surface of described support portion is positioned at the right-hand of described containing cavity left surface.
Described earth stud is positioned at the left part of described metallic plate.Position by earth stud limits, thereby makes the top of earth stud be provided with containing cavity, thereby has improved earth stud and the mutual creepage distance of primary winding terminal portions.
Described secondary connection cover is a cover body, and described cover body is provided with an opening, described opening rectangle in the form of a ring, and described opening is the junction of described secondary connection cover and described secondary coil wire connecting portion;
Described secondary coil wire connecting portion is provided with a ring-type rectangular recess matching with described opening profile.Being convenient to secondary connection cover removably connects by inserting the realization of ring-type rectangular recess.
Described current transformer main body comprises primary winding, secondary coil, and described primary winding and described secondary coil are all positioned at described containing cavity; Described primary winding is wound with a bronze medal layer screen outward, and the coiling direction of described copper layer screen is consistent with the coiling direction of described primary winding; Described primary winding comprises high-tension coil, low-voltage coil, the voltage resilient coating that is provided with half between described high-tension coil and described low-voltage coil and leads insulating properties.The utility model is by copper layer screen, thereby realize the effect of shielding, anti-tampering property is strong, realize by voltage resilient coating the semi-insulated effect of partly leading, transition between mild high-tension coil and low-voltage coil, effectively prevents that high-voltage coil and low-voltage coil is due to voltage difference, and the electromagnetic interference causing, in addition the noise that, can also effectively avoid high-voltage coil and low-voltage coil to cause due to voltage difference.Thereby the utility model is realized the effect of high-insulativity by logical layer screen and voltage resilient coating.
Described voltage resilient coating comprises semiconductor crimped paper, kraft capacitor paper, and the both sides up and down of described kraft capacitor paper are equipped with described semiconductor crimped paper;
The coiling direction of described voltage resilient coating is consistent with the coiling direction of described primary winding.
Semiconductor crimped paper is a kind of shielding material of partial discharge control, and shield effectiveness is good; Kraft capacitor paper is a kind of insulating paper.Papery is evenly tight, without eyelet, as thin as cicada's wings, has very high mechanical strength.Good air permeability, electrolyte absorbent properties and chemical purity.Copper and iron ion, chloride and content of ashes are extremely low.PH value approaches neutral.Physical electric performance is good.Puncture voltage, conduction particle are had to particular requirement.
As a kind of preferred version, described kraft capacitor paper is identical with the coiling direction of described primary winding, and described primary winding upper and lower two-layer is equipped with described kraft capacitor paper;
The coiling direction of described semiconductor crimped paper and the coiling direction of described kraft capacitor paper are perpendicular;
Described semiconductor crimped paper is " Z " type holds described primary winding and two-layer described kraft capacitor paper.
As another kind of preferred version, described semiconductor crimped paper, kraft capacitor paper are all consistent with the coiling direction of described primary winding.
Described secondary coil is provided with at least two output leads, and described at least two output leads are drawn from the different number of turn of described secondary coil.The utility model is drawn output lead by the number of turn place different, is convenient to the output signal of telecommunication not of the same race.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the present utility model;
Fig. 2 is the utility model employing Fig. 1 structure and the vertical view that is provided with secondary connection cover;
Fig. 3 is the left view that the utility model adopts Fig. 1 structure.
Embodiment
For technological means, creation characteristic that the utility model is realized, reach object and effect is easy to understand, below in conjunction with further elaboration the utility model of concrete diagram.
With reference to Fig. 1, Fig. 2, Fig. 3, improve the high-insulativity current transformer of surface creepage distance, comprise a current transformer main body, current transformer main body comprises an insulation crust, insulation crust comprises the containing cavity 3 of a fixed placement iron-core coil, also comprise primary winding terminal portions 1, primary winding terminal portions 1 is positioned at the top of containing cavity 3, and primary winding terminal portions 1 upper surface is embedded with two primary winding binding posts 2; Insulation crust also comprises secondary coil wire connecting portion, and secondary coil wire connecting portion is positioned at the forward right side of containing cavity 3 bottoms; Current transformer main body, also comprises secondary connection cover 4, the secondary connection cover 4 secondary coil wire connecting portion that removably connects.The utility model, by be provided with primary winding terminal portions 1 on traditional insulation crust, has improved the creepage distance of primary winding terminal portions 1 with secondary connection portion, has improved insulation stability.Realized the protection to secondary coil terminal portions by secondary connection cover 4, the control at interval the mutual creepage distance of primary winding binding post 2 and secondary wiring terminals.
Primary winding terminal portions 1 outer wall is provided with at least one rectangular ring groove.By rectangular ring groove, in the time of transport the utility model, can be fixed and move to take by rectangular ring groove.Also can further save cast cost.Primary winding terminal portions 1 outer wall is provided with twice rectangular ring groove; Twice rectangular ring groove be arranged in parallel in short transverse; The spacing of twice rectangular ring groove is 5mm to 12mm.Primary winding terminal portions 1 connects container cavity by one rectangular ring groove.
Insulation crust below is provided with a metallic plate for ground connection, is fixed with earth stud on metallic plate.Improve the utility model insulation over the ground.Distance between primary winding binding post 2 and metallic plate is 280mm to 320mm, is preferably 305mm.Can effectively increase like this insulation level between primary winding binding post 2 and ground.Can, with respect to original current transformer, not increase on the basis of the area occupied in horizontal direction again simultaneously, simple raising longitudinal length of the present utility model, thereby realize the prolongation of creepage distance.
Primary winding terminal portions 1 is a rectangular build pour mass, and the width of rectangular build pour mass is less than the width of containing cavity 3, and the length of rectangular build pour mass is less than the length of containing cavity 3.Be convenient to save mould material.
On insulation crust, be also provided with a support portion, support zone is in the below of containing cavity 3, and insulation crust is by support portion connection metal plate; Containing cavity 3, metallic plate and support portion three's right flank is all in same level, and the left surface of containing cavity 3 and the left surface of metallic plate are in same level, and the left surface of support portion is positioned at the right-hand of containing cavity 3 left surfaces.Earth stud is positioned at the left part of metallic plate.Position by earth stud limits, thereby makes the top of earth stud be provided with containing cavity 3, thereby has improved earth stud and the mutual creepage distance of primary winding terminal portions 1.
Secondary connection cover 4 is cover bodies, and cover body is provided with an opening, and opening is rectangle in the form of a ring, and opening is the junction of secondary connection cover 4 and secondary coil wire connecting portion; Secondary coil wire connecting portion is provided with a ring-type rectangular recess matching with opening profile.Being convenient to secondary connection cover 4 removably connects by inserting the realization of ring-type rectangular recess.
Secondary connection cover 4 is electro-magnetic shielding covers, and electro-magnetic shielding cover comprises a plastic substrate, is embedded with conductive fiber layer in plastic substrate, and conductive fiber layer is the fibrage of being made up of conductive fiber.The utility model is embedded with conductive fiber layer in the plastic substrate of traditional current transformer, so can use for a long time, do not need to consider resistance to wear and the corrosivity of conductive fiber layer, in addition, can had both had plastic product and had been easy to the feature being shaped, and also had the radiation-resistant feature of electromagnetic shielding that electric conducting material just possesses.
Insulation crust is the can of being made up of electromagnetic shielding material, and insulation crust comprises a plastic substrate; In plastic substrate, be embedded with conductive fiber layer, conductive fiber layer is the fibrage of being made up of conductive fiber.The utility model is embedded with conductive fiber layer in the plastic substrate of traditional current transformer, so can use for a long time, do not need to consider resistance to wear and the corrosivity of conductive fiber layer, in addition, can had both had plastic product and had been easy to the feature being shaped, and also had the radiation-resistant feature of electromagnetic shielding that electric conducting material just possesses.
Current transformer main body comprises primary winding, secondary coil, and primary winding and secondary coil are all positioned at containing cavity 3; Primary winding is wound with a bronze medal layer screen outward, and the coiling direction of copper layer screen is consistent with the coiling direction of primary winding; Primary winding comprises high-tension coil, low-voltage coil, the voltage resilient coating that is provided with half between high-tension coil and low-voltage coil and leads insulating properties.The utility model is by copper layer screen, thereby realize the effect of shielding, anti-tampering property is strong, realize by voltage resilient coating the semi-insulated effect of partly leading, transition between mild high-tension coil and low-voltage coil, effectively prevents that high-voltage coil and low-voltage coil is due to voltage difference, and the electromagnetic interference causing, in addition the noise that, can also effectively avoid high-voltage coil and low-voltage coil to cause due to voltage difference.Thereby the utility model is realized the effect of high-insulativity by logical layer screen and voltage resilient coating.
Voltage resilient coating comprises semiconductor crimped paper, kraft capacitor paper, and the both sides up and down of kraft capacitor paper are equipped with semiconductor crimped paper; The coiling direction of voltage resilient coating is consistent with the coiling direction of primary winding.Semiconductor crimped paper is a kind of shielding material of partial discharge control, and shield effectiveness is good; Kraft capacitor paper is a kind of insulating paper.Papery is evenly tight, without eyelet, as thin as cicada's wings, has very high mechanical strength.Good air permeability, electrolyte absorbent properties and chemical purity.Copper and iron ion, chloride and content of ashes are extremely low.PH value approaches neutral.Physical electric performance is good.Puncture voltage, conduction particle are had to particular requirement.
As a kind of preferred version, kraft capacitor paper is identical with the coiling direction of primary winding, the upper and lower two-layer kraft capacitor paper that is equipped with of primary winding; The coiling direction of semiconductor crimped paper and the coiling direction of kraft capacitor paper are perpendicular; Semiconductor crimped paper is " Z " type holds primary winding and two-layer kraft capacitor paper.
As another kind of preferred version, semiconductor crimped paper, kraft capacitor paper are all consistent with the coiling direction of primary winding.Secondary coil is provided with at least two output leads, and at least two output leads are drawn from the different number of turn of secondary coil.The utility model is drawn output lead by the number of turn place different, is convenient to the output signal of telecommunication not of the same race.
More than show and described general principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (10)
1. improve the high-insulativity current transformer of surface creepage distance, comprise a current transformer main body, it is characterized in that, described current transformer main body comprises an insulation crust, described insulation crust comprises the containing cavity of a fixed placement iron-core coil, also comprise primary winding terminal portions, described primary winding terminal portions is positioned at the top of described containing cavity, and described primary winding terminal portions upper surface is embedded with two primary winding binding posts;
Described insulation crust also comprises secondary coil wire connecting portion, and described secondary coil wire connecting portion is positioned at the forward right side of described containing cavity bottom;
Described current transformer main body, also comprises secondary connection cover, the described secondary connection cover described secondary coil wire connecting portion that removably connects.
2. the high-insulativity current transformer of raising surface creepage distance according to claim 1, is characterized in that, described primary winding terminal portions outer wall is provided with at least one rectangular ring groove;
Described primary winding terminal portions connects described container cavity by one described rectangular ring groove.
3. the high-insulativity current transformer of raising surface creepage distance according to claim 1 and 2, is characterized in that, described primary winding terminal portions outer wall is provided with twice rectangular ring groove; Described twice rectangular ring groove be arranged in parallel in short transverse;
The spacing of described twice rectangular ring groove is 5mm to 12mm.
4. the high-insulativity current transformer of raising surface creepage distance according to claim 1, is characterized in that, described insulation crust below is provided with a metallic plate for ground connection, is fixed with earth stud on metallic plate;
Distance between described primary winding binding post and described metallic plate is 280mm to 320mm.
5. the high-insulativity current transformer of raising surface creepage distance according to claim 4, it is characterized in that, described primary winding terminal portions is a rectangular build pour mass, the width of described rectangular build pour mass is less than the width of described containing cavity, and the length of described rectangular build pour mass is less than the length of described containing cavity.
6. according to the high-insulativity current transformer of the raising surface creepage distance described in claim 4 or 5, it is characterized in that, on described insulation crust, be also provided with a support portion, described support zone is in the below of described containing cavity, and described insulation crust connects described metallic plate by described support portion;
Described containing cavity, described metallic plate and described support portion three's right flank is all in same level, the left surface of described containing cavity and the left surface of described metallic plate are in same level, and the left surface of described support portion is positioned at the right-hand of described containing cavity left surface.
7. the high-insulativity current transformer of raising surface creepage distance according to claim 6, is characterized in that, described earth stud is positioned at the left part of described metallic plate.
8. the high-insulativity current transformer of raising surface creepage distance according to claim 1, it is characterized in that, described secondary connection cover is a cover body, described cover body is provided with an opening, described opening rectangle in the form of a ring, described opening is the junction of described secondary connection cover and described secondary coil wire connecting portion;
Described secondary coil wire connecting portion is provided with a ring-type rectangular recess matching with described opening profile.
9. the high-insulativity current transformer of raising surface creepage distance according to claim 1, is characterized in that, described current transformer main body comprises primary winding, secondary coil, and described primary winding and described secondary coil are all positioned at described containing cavity;
Described primary winding is wound with a bronze medal layer screen outward, and the coiling direction of described copper layer screen is consistent with the coiling direction of described primary winding; Described primary winding comprises high-tension coil, low-voltage coil, the voltage resilient coating that is provided with half between described high-tension coil and described low-voltage coil and leads insulating properties.
10. the high-insulativity current transformer of raising surface creepage distance according to claim 9, is characterized in that, described voltage resilient coating comprises semiconductor crimped paper, kraft capacitor paper, and the both sides up and down of described kraft capacitor paper are equipped with described semiconductor crimped paper;
The coiling direction of described voltage resilient coating is consistent with the coiling direction of described primary winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420361559.2U CN203983020U (en) | 2014-07-01 | 2014-07-01 | Improve the high-insulativity current transformer of surface creepage distance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420361559.2U CN203983020U (en) | 2014-07-01 | 2014-07-01 | Improve the high-insulativity current transformer of surface creepage distance |
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| CN203983020U true CN203983020U (en) | 2014-12-03 |
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| CN201420361559.2U Expired - Fee Related CN203983020U (en) | 2014-07-01 | 2014-07-01 | Improve the high-insulativity current transformer of surface creepage distance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111478524A (en) * | 2020-05-05 | 2020-07-31 | 青岛博锐密封技术有限公司 | Flexible conductive fiber motor shaft voltage grounding bolt device |
-
2014
- 2014-07-01 CN CN201420361559.2U patent/CN203983020U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111478524A (en) * | 2020-05-05 | 2020-07-31 | 青岛博锐密封技术有限公司 | Flexible conductive fiber motor shaft voltage grounding bolt device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141203 Termination date: 20210701 |
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| CF01 | Termination of patent right due to non-payment of annual fee |