CN204740937U - Current transformer and primary winding thereof - Google Patents

Abstract

The utility model discloses a current transformer's primary winding, including being used for wire (1) and the parcel through the electric current insulating layer (2) of wire (1), a plurality of centering on has set gradually in insulating layer (2) the electric capacity of the tube -shape of wire (1) screen (3), adjacent two interval and quilt have between the electric capacity screen (3) fill insulating layer (2), the both ends of wire (1) are located electric capacity screen (3) outside, all overturn and wrap up annular shaping ring (4) in the both ends of electric capacity screen (3). Can eliminate the electric field concentrates reduction partial discharge and operation reliable. The utility model also discloses a current transformer of including above -mentioned primary winding.

Description

Current transformer and a winding thereof

Technical field

The utility model relates to electromagnetic arts, particularly relates to an a kind of winding of current transformer.In addition, the utility model also relates to a kind of current transformer comprising an above-mentioned winding.

Background technology

Current transformer has in a lot of field to be applied widely, and the principle of its foundation is electromagnetic induction principle.Current transformer is made up of the iron core closed and winding, and its umber of turn is little, and be wrapped in one end of iron core as input and be connected on and have in the circuit of larger current, therefore a winding place has larger electric current and voltage.

At present, generally adopt oil-immersed current transformer, its winding many employings capacitance type structure, its capacitance plate is generally thinner aluminum foil material, because electric field is concentrated, makes capacitance plate Analysis of End Electric Field comparatively large, easily produces partial discharge phenomenon.Simultaneously because aluminum foil material is airtight, the moisture content in a winding insulation is not easily got rid of, and needs perforate on aluminium foil, and then reduces the reliability of a winding.

Therefore, a kind of electric field of can eliminating how is provided to concentrate and reduce partial discharge and reliable winding is the current technical issues that need to address of those skilled in the art.

Utility model content

The purpose of this utility model is to provide an a kind of winding of current transformer, can eliminate electric field and concentrate and reduce partial discharge and reliable.Another object of the present utility model is to provide a kind of current transformer comprising an above-mentioned winding, can eliminate electric field and concentrate and reduce partial discharge and reliable.

For solving the problems of the technologies described above, the utility model provides an a kind of winding of current transformer, comprise for the insulating barrier by the wire of electric current and the described wire of parcel, the capacitance plate of multiple tubular around described wire is disposed with in described insulating barrier, between two adjacent described capacitance plates, there is interval and filled by described insulating barrier, the two ends of described wire are positioned at described capacitance plate outside, and the two ends of described capacitance plate all overturn and wrap up the forming ring of ring-type.

Preferably, the cross section of described forming ring is circular.

Preferably, distance between place, the end plane of described capacitance plate and the end of described wire increases successively, in two adjacent described capacitance plates, near place, the end plane of the described capacitance plate of described wire than place, the end plane away from the described capacitance plate of described wire more close to the end of described wire.

Preferably, the distance between two adjacent described capacitance plates is equal.

Preferably, four described capacitance plates are provided with.

Preferably, described forming ring is specially preformed insulation forming ring.

Preferably, described insulating barrier is specially cable paper insulating barrier.

Preferably, described capacitance plate is specially semiconductive crimped paper capacitance plate.

The utility model also provides a kind of current transformer, comprises a winding and secondary winding, and a described winding is specially a winding described in above-mentioned any one.

The winding that the utility model provides, comprise wire, insulating barrier and capacitance plate, wherein insulating barrier parcel wire, the capacitance plate of multiple tubular is around wire and be arranged in insulating barrier, have interval between two adjacent capacitance plates and filled by insulating barrier, the two ends of capacitance plate all overturn and wrap up the forming ring of ring-type.Make the two ends of capacitance plate have larger circular arc in this way, and then improve the concentrated situation of electric field, reduce partial discharge, make its operational reliability higher.

The current transformer that the utility model provides comprises an above-mentioned winding, and because an above-mentioned winding has above-mentioned technique effect, above-mentioned current transformer also should have same technique effect, introduces no longer in detail at this.

Accompanying drawing explanation

Fig. 1 is the structural representation of a kind of embodiment of a winding provided by the utility model.

Embodiment

Core of the present utility model is to provide an a kind of winding of current transformer, can eliminate electric field and concentrate and reduce partial discharge and reliable.Another core of the present utility model is to provide a kind of current transformer comprising an above-mentioned winding, can eliminate electric field and concentrate and reduce partial discharge and reliable.

In order to make those skilled in the art person understand the utility model scheme better, below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.

Please refer to Fig. 1, Fig. 1 is the structural representation of a kind of embodiment of a winding provided by the utility model.

The winding that the utility model embodiment provides, comprise wire 1, insulating barrier 2 and capacitance plate 3, wherein wire 1 is for being wound in iron core and producing inductance after energising, insulating barrier 2 wraps up wire 1, the capacitance plate 3 of multiple tubular sets gradually with insulating barrier 2 around wire 1, between two adjacent capacitance plates 3, there is interval and filled by insulating barrier 2, and the two ends of wire 1 are positioned at capacitance plate 3 outside.In order to reduce partial discharge, all overturning at the two ends of capacitance plate 3 and wrapping up the forming ring 4 of ring-type, making the two ends of capacitance plate 3 have larger circular arc, and then improving the situation that electric field concentrates, reducing partial discharge, make its operational reliability higher.

Wherein the cross section of forming ring 4 can be circular; namely can be regarded as a cylinder joins end to end around the annulus formed; by being set to circular cross-section; increase the radian of capacitance plate 3 end; prevent electric field from concentrating; also the cross section of other shapes can be adopted, as ellipse, all within protection range of the present utility model.

In the winding that the utility model embodiment provides, in one end of a winding, distance between place, the end plane of capacitance plate 3 and the end of wire 1 increases successively, namely in adjacent two capacitance plates 3, near place, the end plane of the capacitance plate 3 of wire 1 than place, the end plane away from the capacitance plate 3 of wire 1 more close to the end of wire 1.Namely be the end at a winding, the stepped arrangement of multiple capacitance plates 3, place, end plane near the capacitance plate 3 of wire 1 is nearest from the end of wire 1, farthest away from the capacitance plate 3 of wire 1 place, end plane from wire 1 end farthest, the capacitance plate 3 being positioned at middle part shortens successively.The other end of a winding also adopts this version, by the capacitance plate 3 of arranged in step shape, increases the distance between the capacitance plate 3 of high potential and the capacitance plate 3 of electronegative potential further, ensures a winding reliability of operation.Also other forms of set-up mode can be adopted, as being set up in parallel, all within protection range of the present utility model.

In the winding that the utility model embodiment provides; the distance between two adjacent capacitance plates 3 can be made equal; namely multiple capacitance plate 3 is uniformly distributed; make the Potential distribution on capacitance plate 3 even; also can unevenly arrange; namely the distance between two adjacent capacitance plates 3 not etc., as long as ensure the normal work of a winding, also within protection range of the present utility model.

In the winding that the utility model embodiment provides, four capacitance plates 3 can be set, also can adjust the quantity of capacitance plate 3 according to actual conditions, as long as ensure the normal work of a winding, all within protection range of the present utility model.

In the winding that the utility model embodiment provides, forming ring 4 can be specially preformed insulation forming ring.Set forming ring 4 in advance, be convenient to the making of a winding, also can arrange with capacitance plate 3 integral type, all within protection range of the present utility model.

In the winding that the utility model embodiment provides; insulating barrier 2 can be specially cable paper insulating barrier; insulating barrier 2 is wound by cable paper; be convenient to the installation of a winding; also integrated insulating barrier 2 can be set to; by wire 1 grade of capacitance plate 3, directly injection moulding is inner in insulating barrier 2, all within protection range of the present utility model.

On the basis of the winding provided in above-mentioned each embodiment; capacitance plate 3 can be specially semiconductive crimped paper capacitance plate; compared to traditional aluminium foil capacitance plate; more ventilative; be convenient to the discharge of moisture, increase the reliability of a winding further, also adopt the capacitance plate 3 of other materials; as long as forming ring 4 can be wrapped up in end, all within protection range of the present utility model.

Except an above-mentioned winding, embodiment of the present utility model also provides a kind of current transformer comprising an above-mentioned winding, and the structure of these other each several parts of current transformer please refer to prior art, repeats no more herein.

Above current transformer provided by the utility model and a winding thereof are described in detail.Apply specific case herein to set forth principle of the present utility model and execution mode, the explanation of above embodiment just understands method of the present utility model and core concept thereof for helping.Should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model principle, can also carry out some improvement and modification to the utility model, these improve and modify and also fall in the protection range of the utility model claim.

Claims (9)

1. a winding of a current transformer, comprise for the insulating barrier (2) by the wire (1) of electric current and the described wire of parcel (1), the capacitance plate (3) of multiple tubular around described wire (1) is disposed with in described insulating barrier (2), between two adjacent described capacitance plates (3), there is interval and filled by described insulating barrier (2), the two ends of described wire (1) are positioned at described capacitance plate (3) outside, it is characterized in that, the two ends of described capacitance plate (3) all overturn and wrap up the forming ring (4) of ring-type.

2. a winding according to claim 1, is characterized in that, the cross section of described forming ring (4) is circular.

3. a winding according to claim 1, it is characterized in that, distance between place, the end plane of described capacitance plate (3) and the end of described wire (1) increases successively, in two adjacent described capacitance plates (3), near place, the end plane of the described capacitance plate (3) of described wire (1) than place, the end plane away from the described capacitance plate (3) of described wire (1) more close to the end of described wire (1).

4. a winding according to claim 3, is characterized in that, the distance between two adjacent described capacitance plates (3) is equal.

5. a winding according to claim 4, is characterized in that, is provided with four described capacitance plates (3).

6. a winding according to claim 1, is characterized in that, described forming ring (4) is specially preformed insulation forming ring.

7. a winding according to claim 1, is characterized in that, described insulating barrier (2) is specially cable paper insulating barrier.

8. a winding according to claim 1 to 7 any one, is characterized in that, described capacitance plate (3) is specially semiconductive crimped paper capacitance plate.

9. a current transformer, comprises a winding and secondary winding, it is characterized in that, a described winding is specially a winding described in claim 1 to 8 any one.