CN212625104U - Capacitor core and transformer bushing - Google Patents

Abstract

The utility model discloses a capacitor core, which comprises a conductive rod, a plurality of insulating layers and a plurality of capacitor screens, wherein the insulating layers and the capacitor screens are alternately wound outside the conductive rod; every insulating layer sets up two at least notches with the electric capacity screen department of being connected, every insulating layer through notch centre gripping coiling every layer electric capacity screen in every insulating layer outside, the one end of every layer electric capacity screen of notch centre gripping is electric capacity screen head, the other end of every layer electric capacity screen is electric capacity screen afterbody, electric capacity screen head and electric capacity screen afterbody contact after coiling are connected. The utility model discloses a set up the notch on the insulating layer of electric capacity core to the whole week of centre gripping electric capacity screen is convoluteed, can make the electric capacity screen head and the tail contact connection after the whole week wraps up simultaneously, keeps lap department equipotential, thereby avoids producing breakdown phenomenon.

Description

Capacitor core and transformer bushing

Technical Field

The utility model relates to an insulating technical field of power transmission and transformation, more specifically relate to a transformer is electric capacity core and transformer bushing for sleeve pipe.

Background

The transformer bushing is a main insulation device outside a transformer box and comprises a capacitor core, a composite outer sleeve, metal accessories and the like. The current winding process of the capacitor core can be divided into semi-automatic paper tape strip winding and full-automatic wide cable paper whole winding, and the current process is mature for strip winding mode; for the whole roll of wide cable paper, the problem that aluminum foil cannot be wrapped into a whole circle is often generated in the production process. In addition, for products of 252kV and below, the influence is generally small due to the low voltage of the products, but for higher voltage levels, the joint position after the aluminum foil is wrapped by one circle is separated by a layer of cable paper, and the voltage difference is easy to occur between the separated aluminum foil and the whole circle of aluminum foil, resulting in breakdown.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model aims to provide an electric capacity core guarantees that the whole roll in-process aluminium foil of broad width cable paper can wrap up all around to and avoid aluminium foil lap seam department to produce the phenomenon of discharging.

In order to realize the purpose of the utility model, the utility model adopts the following technical means: a capacitor core comprises a conductive rod, a plurality of insulating layers and a plurality of capacitor screens, wherein the insulating layers and the capacitor screens are wound on the outer side of the conductive rod alternately; every insulating layer sets up two at least notches with the electric capacity screen department of being connected, every insulating layer through notch centre gripping coiling every layer electric capacity screen in every insulating layer outside, the one end of every layer electric capacity screen of notch centre gripping is electric capacity screen head, the other end of every layer electric capacity screen is electric capacity screen afterbody, electric capacity screen head and electric capacity screen afterbody contact after coiling are connected.

Through set up notch centre gripping electric capacity screen on the insulating layer, when preparing the electric capacity core, need not extra fixing device and fix the electric capacity screen, simultaneously through the notch, the electric capacity screen after coiling a week can realize the contact connection of end to end in notch department to realize the whole week of electric capacity screen and wrap, and the electric capacity screen end to end can reach the equipotential, avoided the breakdown phenomenon of overlap joint department.

Preferably, the insulating layer is made by winding the whole cable paper, that is, the insulating layer is made by winding the cable paper continuously and uninterruptedly.

Preferably, the notch is rectangular or semicircular to better retain the capacitive screen.

Preferably, the openings of the at least two notches are located on the same straight line along the axial direction of the conducting rod, so that the capacitive screen and the insulating layer are kept parallel.

Preferably, the capacitive screen is an aluminum foil, and the aluminum foil is wrapped around the outer wall of the insulating layer.

Preferably, two aluminum foils are arranged on each layer of the capacitive screen.

Preferably, the width of the capacitive screen along the axial direction of the conductive rod is 600 mm.

Preferably, the distance between the head part and the tail part of the wound capacitive screen is 20-25 mm, so that a certain design margin is ensured, and the head part and the tail part of the capacitive screen can be in contact connection.

Preferably, each insulating layer is formed by winding a plurality of sub-insulating layers, that is, after a plurality of insulating layers, a layer of capacitive screen is wound, and the layers alternate in sequence.

In order to achieve the above object, the present invention adopts another technical solution as follows: a transformer bushing comprising a capacitor core as claimed in any one of the preceding claims.

The utility model has the advantages that: the notches are formed in the insulating layer of the capacitor core, so that the capacitor screen can be clamped to be wound in the whole circumference, meanwhile, the capacitor screen wrapped in the whole circumference can be in contact connection from head to tail, the equipotential of the lap joint is kept, and the breakdown phenomenon is avoided. Meanwhile, the length of each layer of capacitive screen is determined by presetting the position of the notch, the length of 20-25 mm remained after the capacitive screen is wound is ensured, and the head and the tail of the capacitive screen are fully ensured to be contacted.

Drawings

Fig. 1 is a schematic cross-sectional view of a capacitor core 100 according to a first embodiment of the present invention;

fig. 2 is a schematic perspective view of a capacitor core 100 according to a first embodiment of the present invention;

FIG. 3 is an enlarged schematic view at A in FIG. 2;

fig. 4 is a schematic cross-sectional view of a transformer bushing 10 according to a second embodiment of the present invention.

Detailed Description

As required, detailed embodiments of the present invention will be disclosed herein. However, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which may be embodied in various forms. Therefore, specific details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriately detailed manner, including employing various features disclosed herein in connection with which such features may not be explicitly disclosed.

The first embodiment is as follows:

as shown in fig. 1, the capacitor core 100 includes a conductive rod 110, a plurality of insulating layers 120 and a plurality of capacitive shields 130, wherein the insulating layers 120 and the capacitive shields 130 are alternately wound on the outer side of the conductive rod 110, and each layer of capacitive shield 130 is disposed on the inner wall of each insulating layer 120.

Specifically, as shown in fig. 3, each insulating layer 120 is composed of a plurality of sub-insulating layers 121 (the number of sub-insulating layers 121 marked in the figure does not represent the number of actual sub-insulating layers), and the sub-insulating layers 121 are made by winding a whole roll of cable paper, i.e., the sub-insulating layers 121 are the cable paper 121. As shown in fig. 2, each layer of capacitive screen 130 is composed of two sub capacitive screens 131, and the sub capacitive screens 131 are made of aluminum foil, i.e., the sub capacitive screens 131 are aluminum foils 131. Of course, the insulating layer 120 and the capacitive screen 130 may also be made of other similar materials, for example, the insulating layer 120 is made of glass fiber, polyester cloth, etc., and the capacitive screen 130 is made of electroplated cloth, carbon fiber cloth, or a semiconductor suitable layer, etc.

In the present embodiment, a notch 122 is formed on an inner wall of the outermost cable paper 121 of each insulation layer 120, the notch 122 is composed of two sets of sub-notches 123, each set of sub-notches 123 holds one aluminum foil 131, and in other embodiments, three sets of sub-notches 123 or four sets of sub-notches 123 may be formed on the notch 122. The notches 122 are arranged in a rectangular or semi-circular shape to better grip the capacitive screen 130. Meanwhile, the opening positions of each group of sub-slots 123 are located on the same straight line along the axial direction of the conductive rod 110, so that the capacitive screen 130 and the insulating layer 120 are kept parallel.

Further, as shown in fig. 1 and 2, one end of the aluminum foil 131 clamped in the sub-slot 123 is an aluminum foil head 132, and the other end is an aluminum foil tail 133, and two pieces of aluminum foil 131 are simultaneously clamped by the outermost cable paper 121 of each insulating layer 120 and are wound along the circumferential direction of the conductive rod 110. The distance of the aluminum foil 131 along the radial direction of the conductive rod 110 is an aluminum foil length L, the distance of the aluminum foil 131 along the axial direction of the conductive rod 110 is an aluminum foil height H, and the aluminum foil length L is 20 mm-25 mm larger than the circumference of the capacitor core 100, so that the aluminum foil head 132 and the aluminum foil tail 133 which are wrapped around one circle can be in contact connection. Specifically, after the aluminum foil 131 is clamped in the sub-notch 123, the aluminum foil head 132 is exposed to the outside of the cable paper 121 through the sub-notch 123, since the length L of the aluminum foil is 20mm to 25mm longer than the circumference of the layer of capacitor core 100, the wound aluminum foil tail 133 covers the exposed portion of the aluminum foil head 132 to the outside of the cable paper 121 to realize contact connection, and the winding is continued forward, so that the distance between the wound capacitor screen head and the wound capacitor screen tail is 20mm to 25mm, thereby ensuring the reliability of the contact. And the height H of the aluminum foil is set to 600mm by design calculation, although the height H may be set to other dimensions in other cases.

Through setting up notch 122, when preparing electric capacity core 100, need not extra part and fix aluminium foil 131, simultaneously through notch 122, make the aluminium foil 131 after coiling a week realize the end to end contact connection in notch 122 department to realize the whole week of aluminium foil 131 and wrap up, guarantee that aluminium foil head 132 and aluminium foil afterbody 133 can the equipotential, avoided aluminium foil head 132 and aluminium foil afterbody 133's lap seam department owing to there is the interlayer to produce pressure differential, thereby take place the breakdown phenomenon. And, according to the design calculation, the distance between the aluminum foil head 132 and the aluminum foil tail 133 after wrapping for one circle is at least 20 mm-25 mm, and the design margin is reserved to fully ensure that the aluminum foil head 132 and the aluminum foil tail 133 can be in contact connection.

Example two:

the present invention provides a transformer bushing 10, the transformer bushing 10 includes a capacitor core 100, the capacitor core 100 is any one of the capacitor cores 100, and the detailed structure can be seen in the above embodiments, which is not repeated herein.

While the invention has been described with reference to the above disclosure, it will be understood by those skilled in the art that various changes and modifications in the above-described structures and materials, including combinations of features disclosed herein either individually or in any combination, will be apparent to one skilled in the art from the disclosure herein. These variants and/or combinations fall within the technical field of the present invention and are intended to be protected by the following claims.

Claims (10)

1. A capacitor core, comprising:

the conductive rod, the insulating layers and the capacitive screens are wound on the outer side of the conductive rod alternately;

every the insulating layer with the electric capacity screen junction sets up two at least notches, every the insulating layer passes through notch centre gripping is convoluteed every layer in the insulating layer outside the electric capacity screen, every layer of notch centre gripping the one end of electric capacity screen is electric capacity screen head, every layer the other end of electric capacity screen is electric capacity screen afterbody, after convoluteing the electric capacity screen head with electric capacity screen afterbody contact is connected.

2. A capacitive core according to claim 1 wherein the insulating layer is made from a roll of cable paper.

3. A capacitor core according to claim 1, wherein the slot is rectangular or semi-circular.

4. A condenser core according to claim 1, wherein the opening positions of at least two of the notches are located on the same line in the axial direction of the conductive rod.

5. The condenser core as claimed in claim 1, wherein the condenser screen is an aluminum foil, and the aluminum foil is wrapped around the outer wall of the insulating layer.

6. A capacitive wick according to claim 5, wherein two sheets of aluminium foil are provided per layer of the capacitive screen.

7. A condenser core as claimed in claim 1, wherein the width of the condenser screen in the axial direction of the conductive rod is 600 mm.

8. The condenser core as claimed in claim 1, wherein the distance between the head portion and the tail portion of the condenser screen after winding is 20mm to 25 mm.

9. A capacitive core according to claim 1 wherein each of said layers is wound from a plurality of sub-layers.

10. A transformer bushing, characterized in that it comprises a capacitive core according to any one of claims 1 to 9.

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