CN103117161A - Electric conduction assembly of current transformer and current transformer - Google Patents
Electric conduction assembly of current transformer and current transformer Download PDFInfo
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- CN103117161A CN103117161A CN2011103661407A CN201110366140A CN103117161A CN 103117161 A CN103117161 A CN 103117161A CN 2011103661407 A CN2011103661407 A CN 2011103661407A CN 201110366140 A CN201110366140 A CN 201110366140A CN 103117161 A CN103117161 A CN 103117161A
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- conductive component
- shielded
- conducting rod
- plate tube
- current transformer
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Abstract
The invention provides an electric conduction assembly of a current transformer. The electric conduction assembly comprises a shielding pipe (10) and at least one conducting rod (20) which is arranged in the shielding pipe (10) in a penetrating mode. The shielding pipe (10) and the conducting rod (20) are the same in electric potential, and are separated from each other in an electric mode. The shielding pipe (10) can bear current in a primary conductor through electric connection with the conducting rod (20). The invention further provides a current transformer which uses the electric conduction assembly. The shielding pipe is utilized to be involved in electric conduction, and space utilization rate of the electric conduction assembly is improved. For the requirements of the same rated current, the size of the electric conduction assembly can be reduced, and materials of the electric conduction assembly are saved, and production cost is reduced.
Description
Technical field
The present invention relates to a kind of conductive component for current transformer, relate in particular to a kind of conductive component for inverted type current transformer.The invention still further relates to the current transformer that uses this conductive component.
Background technology
Be used for traditional electromagnetic current transducer of electric power system, the size of current that the mode by the magnetic core electromagnetic coupled will be used for the Primary Conductor of electric power transfer feeds back to the secondary conductor for measurement.Primary Conductor is located on magnetic core, and secondary conductor is wound on magnetic core, and has certain turn ratio between them, to realize the low current in the secondary conductor with the high current conversion in Primary Conductor.In existing electromagnetic current transducer, Primary Conductor exists a circle, two circles and three kinds of modes of four circles, and the canoe of secondary conductor on magnetic core only has the number of turn of a fixed qty.Primary Conductor is located on magnetic core by the form of conductive component, and in order to satisfy the client for the demand of polytropic ratio, make the client can be under the prerequisite of not changing current transformer, realize that polytropic ratio coexists on a current transformer, general current transformer all is provided with a transition apparatus that is used in conjunction with conductive component.By transition apparatus, the client can change easily Primary Conductor and control the no-load voltage ratio of current transformer with respect to the number of turn of magnetic core.Such as, if Primary Conductor is a circle, secondary conductor is 1,000 circles, the no-load voltage ratio of the primary current of current transformer and secondary current is exactly 1000: 1; Utilize transition apparatus that a number of turn is adjusted into two circles as the user, because the secondary conductor number of turn keeps 1,000 circles constant, the no-load voltage ratio of current transformer just becomes 500: 1.
Take realize Primary Conductor with respect to the number of turn of magnetic core as the structure of the conductive component of two circles as example, Fig. 1 is used for the structural representation of the existing two circle conductive components of explanation.As shown in the figure, conductive component comprises a shielded-plate tube 30 and two conducting rods 40, and wherein two conducting rods 40 are carrying object and are arranged in shielded-plate tube 30.Shielded-plate tube 30 is in identical current potential with conducting rod 40, and is used for improving the Electric Field Distribution of conducting rod, makes whole conductive component have the current potential of uniformity.When transition apparatus was connected in series two conducting rods 40, being equivalent to the number of turn of Primary Conductor on magnetic core was two circles, and when transition apparatus was connected in parallel two conducting rods 40, being equivalent to the number of turn of Primary Conductor on magnetic core was a circle.
Consider the huge current flow of carrying in conducting rod, the size of conducting rod and volume are all very large, thereby make the size of shielded-plate tube of jacket conducting rod also very large, and then make the volume of whole current transformer very large.In shielded-plate tube, except the space that conducting rod takies, all left unused in other space, taken the material of a large amount of conductive components, increased the cost of whole current transformer.
Summary of the invention
The object of the present invention is to provide a kind of conductive component for current transformer, this current transformer is used for measuring the electric current of Primary Conductor.The conductive component of this current transformer provided by the invention comprises a shielded-plate tube and at least one conducting rod that is arranged in shielded-plate tube.Shielded-plate tube and each other electrical isolation identical with the conducting rod current potential.Shielded-plate tube can fetch the electric current that carries in Primary Conductor by being electrically connected with conducting rod.Under the prerequisite that guarantees the safe bearing load rated current, utilize shielded-plate tube to participate in conduction, improved the space availability ratio of conductive component.For same rated current requirement, can reduce the size of conductive component and save the material of conductive component, thereby reduce production cost.
According to the conductive component of current transformer of the present invention more on the one hand, conductive component has a conducting rod that is connected in series with shielded-plate tube.
According to the conductive component of current transformer of the present invention on the other hand, conductive component has a conducting rod that is connected in parallel with shielded-plate tube.
According to the another aspect of the conductive component of current transformer of the present invention, conductive component has three conducting rods, and three conducting rods and shielded-plate tube are connected in series successively.
According to the another aspect of the conductive component of current transformer of the present invention, conductive component has three conducting rods, and three conducting rods are connected connection with shielded-plate tube.
According to the another aspect of the conductive component of current transformer of the present invention, conductive component has three conducting rods, and shielded-plate tube is connected with a conducting rod, and is connected in parallel with conducting rod that two other is connected in series.
Another aspect according to the conductive component of current transformer of the present invention, mutually be wound around between three conducting rods, their direction of lay is identical, and in the cross section of conductive component, the line between the geometric center of the cross section figure of three conducting rods forms an equilateral triangle.By using the multiply conducting rod mutually to be wound around the mode of twisting, can offset a part of kelvin effect to the impact of conductive component current capacity, can also make the magnetic field of conductive component evenly distribute simultaneously.
According to the another aspect of the conductive component of current transformer of the present invention, conducting rod and/or shielded-plate tube are prepared by metallic aluminium.
Another aspect according to the conductive component of current transformer of the present invention is filled with polyurethane or epoxy resin between conducting rod and/or between shielded-plate tube and conducting rod.
The present invention also aims to also provide the current transformer that uses above-mentioned conductive component.
Description of drawings
Fig. 1 is used for the structural representation of the existing two circle conductive components of explanation.
Fig. 2 is used for the structural representation of a kind of exemplary embodiment of conductive component of explanation current transformer of the present invention.
Fig. 3 and Fig. 4 are used for the lifting of the conductive component space availability ratio of comparative descriptions current transformer shown in Figure 2.
Fig. 5 is used for the structural representation of the another kind of exemplary embodiment of conductive component of explanation current transformer of the present invention.
Fig. 6 and Fig. 7 are used for the lifting of the conductive component space availability ratio of comparative descriptions current transformer shown in Figure 5.
Fig. 8 is for the winding relation between the conductive component conducting rod that current transformer shown in Figure 5 is described.
Label declaration
10,30 shielded-plate tubes
20,40 conducting rods.
Hereinafter will be in clear and definite understandable mode, the accompanying drawings preferred embodiment is further described the conductive component of current transformer and above-mentioned characteristic, technical characterictic, advantage and the implementation thereof of current transformer thereof.
Embodiment
Understand for technical characterictic, purpose and effect to invention have more clearly, now contrast description of drawings the specific embodiment of the present invention, identical label represents identical or structural similarity but the identical part of function in each figure.
For making drawing succinct, only schematically shown part related to the present invention in each figure, they do not represent that it is as the practical structures of product.In addition, so that drawing succinctly is convenient to understand, the parts that have same structure or function in some figure have only schematically illustrated one of them, or have only marked one of them.
Fig. 2 is for the structural representation of a kind of exemplary embodiment of the conductive component of explanation current transformer of the present invention.As shown in the figure, current transformer is used for measuring the electric current of Primary Conductor, and its conductive component comprises a shielded-plate tube 10 and a conducting rod 20.Conducting rod 20 is arranged in shielded-plate tube 10, and shielded-plate tube 10 and conducting rod 20 have identical current potential and electrical isolation each other.
When shielded-plate tube 10 and conducting rod 20 were connected in series, being equivalent to the number of turn of Primary Conductor on magnetic core was two circles; When shielded-plate tube 10 and conducting rod 20 were connected in parallel, being equivalent to the number of turn of Primary Conductor on magnetic core was a circle.Conductive component shown in Figure 2 can be realized two kinds of different turn ratios, and can use any one changing-over mode in prior art to realize the change of connected mode between conducting rod and shielded-plate tube.
Fig. 3 and Fig. 4 are used for the lifting of the conductive component space availability ratio of comparative descriptions current transformer shown in Figure 2.Fig. 3 is used for the conductive component of explanation prior art and realizes a circle and two kinds of schematic cross-sections with respect to a kind of exemplary embodiment of the number of turn of magnetic core of two circles.As shown in the figure, the diameter D that establishes shielded-plate tube 10 is 100mm, and the sectional area that surrounds of whole shielded-plate tube 10 is:
If the wall thickness of shielded-plate tube 10 is 8mm, and consider minimal security insulation distance between the tube wall of minimal security insulation distance between conducting rod 20 and conducting rod 20 and shielded-plate tube 10, the diameter D of conducting rod 20
Conducting rodBe 35mm, thereby obtain the effective-current area S of conductive component shown in Figure 3
DamFor:
The sectional area that the effective-current area is surrounded divided by whole shielded-plate tube obtains conductive component space availability ratio δ
2 circles:
Fig. 4 is used for the conductive component of explanation current transformer and realizes a circle and two kinds of schematic cross-sections with respect to a kind of exemplary embodiment of the number of turn of magnetic core of two circles.As shown in the figure, the diameter of shielded-plate tube D is made as 100mm equally, the sectional area S that whole shielded-plate tube surrounds
AlwaysFor:
If the wall thickness of shielded-plate tube 10 is 8mm, and consider minimal security insulation distance between the tube wall of minimal security insulation distance between conducting rod 20 and conducting rod 20 and shielded-plate tube 10, the diameter of conducting rod 20 is 70mm, effective-current area S
Current-carryingSectional area S for conducting rod
Conducting rodSectional area S with shielded-plate tube
Shielded-plate tubeSum, the effective-current area of conductive component shown in Figure 4 is:
S
Current-carrying=S
Shielded-plate tube+ S
Conducting rod=2312+3848=6160mm
2
With effective-current area S
Current-carryingThe sectional area S that surrounds divided by whole shielded-plate tube
AlwaysObtain conductive component space availability ratio δ
2 circles are new:
From relatively can seeing of the space availability ratio of conductive component shown in Figure 3 and conductive component shown in Figure 4, the space availability ratio of the conductive component of the present invention of Fig. 4 has been brought up to more than 3 times of existing conductive component of Fig. 3.This means, for same current requirements, can only use a conducting rod identical with conducting rod 20 diameters in Fig. 3, and the space between the size of shielded-plate tube and shielded-plate tube and conducting rod can be reduced also, thereby significantly reduce the size of conductive component and saved the material of conductive component.
Fig. 5 is for the structural representation of the another kind of exemplary embodiment of the conductive component of explanation current transformer.As shown in the figure, current transformer is used for measuring the electric current of Primary Conductor, and its conductive component comprises a shielded-plate tube 10 and three conducting rods 20.Conducting rod 20 is arranged in shielded-plate tube 10, and shielded-plate tube 10 and conducting rod 20 have identical current potential and electrical isolation each other.
When being connected in series successively between shielded-plate tube 10 and three conducting rods 20, being equivalent to the number of turn of Primary Conductor on magnetic core is four circles; When shielded-plate tube 10 and three conducting rods 20 were connected in parallel with each other, being equivalent to the number of turn of Primary Conductor on magnetic core was a circle; With after a conducting rod 20 is connected, then the conducting rod 20 of connecting with two other is connected in parallel when shielded-plate tube 10, and being equivalent to the number of turn of Primary Conductor on magnetic core is two circles, thereby can realize three kinds of different turn ratios by conductive component shown in Figure 5.Can use any one changing-over mode in prior art to realize between the conducting rod of conductive component and the change of connected mode between conducting rod and shielded-plate tube.Can also further increase as required the quantity of conducting rod, realizing the number of turn of more kinds of Primary Conductor on magnetic core, thereby realize the no-load voltage ratio of more current transformer.
Fig. 6 and Fig. 7 are used for the lifting of the conductive component space availability ratio of comparative descriptions current transformer shown in Figure 5.Fig. 6 is used for the conductive component of explanation prior art and realizes a circle, two circles and three kinds of schematic cross-sections with respect to a kind of exemplary embodiment of the number of turn of magnetic core of four circles.As shown in the figure, the diameter of establishing shielded-plate tube 10 is 100mm, the sectional area S that whole shielded-plate tube surrounds
AlwaysFor:
If the wall thickness of shielded-plate tube 10 is 8mm, and consider minimal security insulation distance between the tube wall of minimal security insulation distance between conducting rod 20 and conducting rod 20 and shielded-plate tube 10, the diameter D of conducting rod 20
Conducting rodBe 24mm, thereby obtain the effective-current area S of conductive component shown in Figure 6
Current-carryingFor:
With effective-current area S
Current-carryingThe sectional area S that surrounds divided by whole shielded-plate tube
AlwaysObtain conductive component space availability ratio δ
4 circles:
Fig. 7 is used for the conductive component of explanation current transformer and realizes a circle, two circles and three kinds of schematic cross-sections with respect to a kind of exemplary embodiment of the number of turn of magnetic core of four circles.As shown in the figure, the diameter of shielded-plate tube is made as 100mm equally, the sectional area S that whole shielded-plate tube surrounds
AlwaysFor:
If the wall thickness of shielded-plate tube 10 is 8mm, and consider minimal security insulation distance between the tube wall of minimal security insulation distance between conducting rod 20 and conducting rod 20 and shielded-plate tube 10, the diameter of conducting rod 20 is 30mm, and the effective-current area is the sectional area S of three conducting rods
Conducting rodWith shielded-plate tube sectional area S
Shielded-plate tubeSum, the effective-current area S of conductive component shown in Figure 7
Current-carryingFor:
S
Current-carrying=S
Shielded-plate tube+ S
Conducting rod=2312+2121=4433mm
2
The sectional area that the effective-current area is surrounded divided by whole shielded-plate tube obtains conductive component space availability ratio δ
4 circles are new:
From relatively can seeing of the space availability ratio of conductive component shown in Figure 6 and conductive component shown in Figure 7, the space availability ratio of the conductive component of the present invention of Fig. 7 has been brought up to more than 2 times of existing conductive component of Fig. 6.This means, for same current requirements, can only use three conducting rods identical with conducting rod 20 diameters in Fig. 6, and the space between the size of shielded-plate tube and shielded-plate tube and conducting rod can be reduced also, thereby significantly reduce the conductive component size and saved the material of conductive component.The conductive component of current transformer of the present invention is in identical current potential due between shielded-plate tube 10 and conducting rod 20, thereby makes shielded-plate tube 10 improve the Electric Field Distribution of conductive component, makes its Electric Field Distribution even.Simultaneously, utilize shielded-plate tube 10 to participate in conduction, improved the space availability ratio of conductive component, for same rated current requirement, can reduce the size of conductive component and save the material of conductive component, thereby reduce production costs.
Fig. 8 is for the winding relation between the conductive component conducting rod 20 that current transformer shown in Figure 5 is described.As shown in the figure, mutually be wound around between three conducting rods 20, their direction of lay is identical.In the cross section of conductive component, the cross section figure of three conducting rods 20 is circular, and the line between the center of circle of these three circles consists of an equilateral triangle.The shape of cross section of conducting rod can be also other shape.By using the multiply conducting rod mutually to be wound around the mode of twisting, can offset a part of kelvin effect to the impact of conductive component current capacity, can also make the magnetic field of conductive component evenly distribute simultaneously.
In a kind of exemplary embodiment of the conductive component of current transformer, increase due to space availability ratio, the raising of effective-current area, can replace with relatively inexpensive metallic aluminium metallic copper to prepare the conductive components such as conducting rod 20 and/or shielded-plate tube 10, thereby greatly reduced material cost, can certainly use the good cheap metal of other conductivity.Can also filled polyurethane between conducting rod and between conducting rod and shielded-plate tube or epoxy resin etc. have the filler of insulation function.
The present invention also provides a kind of current transformer that uses above-mentioned conductive component.
In this article, " schematically " expression " is served as example, example or explanation ", any diagram, the execution mode that is described in this article " schematically " should be interpreted as a kind of preferred or have more the technical scheme of advantage.
Be to be understood that, although this specification is described according to each embodiment, but be not that each embodiment only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should make specification as a whole, technical scheme in each embodiment also can through appropriate combination, form other execution modes that it will be appreciated by those skilled in the art that.
Above listed a series of detailed description is only illustrating for feasibility embodiment of the present invention; they are not to limit protection scope of the present invention, all disengaging within equivalent embodiment that skill spirit of the present invention does or change all should be included in protection scope of the present invention.
Claims (10)
1. the conductive component of current transformer, described current transformer is used for measuring the electric current of Primary Conductor, and described conductive component comprises:
A shielded-plate tube (10) and be arranged at least one conducting rod (20) in described shielded-plate tube (10),
It is characterized in that:
Identical and the electrical isolation each other of the current potential of described shielded-plate tube (10) and described conducting rod (20); And
Described shielded-plate tube (10) can fetch the electric current that carries in described Primary Conductor by being electrically connected with described conducting rod (20).
2. conductive component as claimed in claim 1, is characterized in that, described conductive component has a described conducting rod (20) that is connected in series with described shielded-plate tube (10).
3. conductive component as claimed in claim 1, is characterized in that, described conductive component has a described conducting rod (20) that is connected in parallel with described shielded-plate tube (10).
4. conductive component as claimed in claim 1, is characterized in that, described conductive component has three described conducting rods (20), and three described conducting rods (20) and described shielded-plate tube (10) are connected in series successively.
5. conductive component as claimed in claim 1, is characterized in that, described conductive component has three described conducting rods (20), three described conducting rods (20) be connected shielded-plate tube (10) connection parallel with one another.
6. conductive component as claimed in claim 1, it is characterized in that, described conductive component has three described conducting rods (20), and described shielded-plate tube (10) is connected with a described conducting rod (20), and is connected in parallel with described conducting rod (20) that two other is connected in series.
7. conductive component as described in any one in claim 4 to 6, it is characterized in that, mutually be wound around between three described conducting rods (20), their direction of lay is identical, and in the cross section of described conductive component, the line between the geometric center of the cross section figure of three described conducting rods (20) forms an equilateral triangle.
8. conductive component as claimed in claim 1, is characterized in that, described conducting rod (20) and/or described shielded-plate tube (10) are prepared by metallic aluminium.
9. conductive component as claimed in claim 1, is characterized in that, is filled with polyurethane or epoxy resin between described conducting rod (20) and/or between described shielded-plate tube (10) and described conducting rod (20).
10. a current transformer, is characterized in that, comprises conductive component as in one of claimed in any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103661407A CN103117161A (en) | 2011-11-17 | 2011-11-17 | Electric conduction assembly of current transformer and current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103661407A CN103117161A (en) | 2011-11-17 | 2011-11-17 | Electric conduction assembly of current transformer and current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103117161A true CN103117161A (en) | 2013-05-22 |
Family
ID=48415508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103661407A Pending CN103117161A (en) | 2011-11-17 | 2011-11-17 | Electric conduction assembly of current transformer and current transformer |
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| Country | Link |
|---|---|
| CN (1) | CN103117161A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106710857A (en) * | 2015-07-31 | 2017-05-24 | 西门子公司 | Current transformer with multi-turn conducting rod |
| US20210193375A1 (en) * | 2017-10-19 | 2021-06-24 | RITZ Instrument Transformers GmbH | Current converter with fluid or oil paper insulation for high voltage |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB308406A (en) * | 1928-01-27 | 1929-03-28 | British Thomson Houston Co Ltd | Improvements relating to electric transformers |
| JPH08115836A (en) * | 1994-10-14 | 1996-05-07 | Nissin Electric Co Ltd | Tripple-ratio current transformer |
| CN201282021Y (en) * | 2008-07-21 | 2009-07-29 | 重庆百纳电气有限公司 | Current transformer |
| CN201886890U (en) * | 2010-11-15 | 2011-06-29 | 山东泰开互感器有限公司 | Current transformer with multi-turn structure |
| CN202332560U (en) * | 2011-11-17 | 2012-07-11 | 上海Mwb互感器有限公司 | Conducting component of current transformer and current transformer thereof |
-
2011
- 2011-11-17 CN CN2011103661407A patent/CN103117161A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB308406A (en) * | 1928-01-27 | 1929-03-28 | British Thomson Houston Co Ltd | Improvements relating to electric transformers |
| JPH08115836A (en) * | 1994-10-14 | 1996-05-07 | Nissin Electric Co Ltd | Tripple-ratio current transformer |
| CN201282021Y (en) * | 2008-07-21 | 2009-07-29 | 重庆百纳电气有限公司 | Current transformer |
| CN201886890U (en) * | 2010-11-15 | 2011-06-29 | 山东泰开互感器有限公司 | Current transformer with multi-turn structure |
| CN202332560U (en) * | 2011-11-17 | 2012-07-11 | 上海Mwb互感器有限公司 | Conducting component of current transformer and current transformer thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106710857A (en) * | 2015-07-31 | 2017-05-24 | 西门子公司 | Current transformer with multi-turn conducting rod |
| CN106710857B (en) * | 2015-07-31 | 2018-12-11 | 西门子公司 | Current transformer with multiturn conducting rod |
| US20210193375A1 (en) * | 2017-10-19 | 2021-06-24 | RITZ Instrument Transformers GmbH | Current converter with fluid or oil paper insulation for high voltage |
| US11735356B2 (en) * | 2017-10-19 | 2023-08-22 | RITZ Instrument Transformers GmbH | Current converter with fluid or oil paper insulation for high voltage |
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