CN217008817U - Simple sleeve for glue-dipped fiber - Google Patents
Simple sleeve for glue-dipped fiber Download PDFInfo
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- CN217008817U CN217008817U CN202121771054.XU CN202121771054U CN217008817U CN 217008817 U CN217008817 U CN 217008817U CN 202121771054 U CN202121771054 U CN 202121771054U CN 217008817 U CN217008817 U CN 217008817U
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Abstract
The simple and convenient sleeve comprises a sleeve insulating core body, wherein the sleeve insulating core body comprises a plurality of insulating layers and a plurality of capacitive screens which are wound alternately, a cavity is formed in the sleeve insulating core body, the insulating layers are formed by winding glass fibers soaked in epoxy resin, a lining pipe is not arranged in the cavity of the sleeve insulating core body, the lining pipe is not required to be arranged, products of the same specification are kept on the basis of the same cavity diameter, the size and the weight are greatly reduced, and the cost is greatly reduced. And at least one end of the sleeve is provided with a voltage-sharing capacitance screen to share the voltage of the end, and a voltage-sharing ball is not needed, so that the cost is low, the size is small, and the assembly and the maintenance are convenient.
Description
Technical Field
The utility model belongs to the field of high-voltage electric appliances, and particularly relates to a simple sleeve for glue-impregnated fibers.
Background
High voltage bushings, which are devices for insulating and supporting one or more conductors passing through a partition such as a wall or a box, are important devices in electrical power systems. The existing glue-impregnated fiber casing is internally provided with a hollow lining pipe, an insulating layer and a capacitive screen are wound on the lining pipe alternately to form an insulating core body used as main insulation, the lining pipe is usually a copper pipe or an aluminum pipe, the insulating layer is formed by winding glass fiber impregnated with epoxy resin on the lining pipe by a wet method, the capacitive screen is formed by winding a conductor or a semi-conductive material on the lining pipe, the insulating layer and the capacitive screen are wound in a plurality of layers alternately to form an insulating core body after curing, the lining pipe can be used as a conducting rod of a high-voltage casing or a cable penetrates through the lining pipe, and the glue-impregnated fiber casing does not need to be filled with oil, does not need to be sealed in various ways to prevent oil leakage, and is very convenient to use. The diameter of the sleeve is increased due to the arrangement of the lining pipe, the using amount of the insulating layer and the capacitive screen is increased in multiples, the weight of the sleeve is also greatly increased, and the cost is greatly improved. In addition, the end of the existing bushing is provided with a voltage-sharing ball to uniform the electric field at the end, but the voltage-sharing ball is easy to damage when being arranged, and if the voltage-sharing ball touches a conducting rod, two points are easy to equipotential to form circulation current, so that the bushing is damaged.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provides a simple sleeve with small volume and low cost for glue-impregnated fiber.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the simple and convenient sleeve comprises a sleeve insulating core body, wherein the sleeve insulating core body comprises a plurality of insulating layers and a plurality of capacitive screens which are wound alternately, the insulating layers are formed by winding glass fibers soaked with epoxy resin, a cavity is formed in the sleeve insulating core body, and no lining pipe is arranged in the cavity of the sleeve insulating core body.
Preferably, the plurality of coaxial capacitive screens in the bushing insulating core comprise a plurality of main capacitive screens forming a main capacitor, wherein the innermost side of the main capacitive screens is a high-voltage capacitive screen, and the outermost side of the main capacitive screens is a ground capacitive screen; and a voltage-sharing capacitor screen is arranged in at least one end part of the sleeve insulating core body and is electrically connected with the high-voltage capacitor screen.
Preferably, the voltage-sharing capacitive screen is closer to the end part corresponding to the sleeve insulating core body than other capacitive screens except the high-voltage capacitive screen and is wound on the outer side of the high-voltage capacitive screen.
Preferably, the plurality of capacitive screens in the bushing insulating core further include a voltage-dividing capacitive screen forming a voltage-dividing capacitor, the main capacitor and the voltage-dividing capacitor are connected in series to form a capacitive voltage divider, and a signal line is connected between the main capacitor and the voltage-dividing capacitor.
Preferably, the plurality of capacitive screens in the sleeve insulating core further comprise shielding capacitive screens forming shielding capacitors, the shielding capacitive screens are wound outside the main capacitive screen and the voltage division capacitive screens, and a group of capacitive screens which are insulated from two ends of the sleeve insulating core to the grounding capacitive screens and are overlapped with each other are wound.
Preferably, the insulating core of the sleeve is sheathed with an insulating shed.
Preferably, one or more secondary coils of the current transformer are sleeved outside the sleeve insulating core body.
Preferably, the mounting flange is arranged on the outer side of the axial middle part of the sleeve insulating core body to divide the sleeve insulating core body into an upper section and a lower section, the upper section and the lower section are a first insulating core section and a second insulating core section, the insulating umbrella skirt is arranged outside the first insulating core section, the connecting terminal is arranged at the end part of the first insulating core section, and the voltage-sharing capacitor screen is arranged in the end part of the second insulating core section.
Preferably, voltage-sharing capacitance screens are arranged at two ends of the sleeve insulating core body.
Preferably, the capacitive screen is formed by winding a conductor material, a semi-conductive material or a mixed braided belt of insulating fibers and conductive fibers.
The simple sleeve for the glue-impregnated fiber does not need to be provided with a lining pipe, and products with the same specification greatly reduce the volume and the weight and the cost on the basis of keeping the same cavity diameter. For example, 110KV casing, 1/2,220KV product can reach 1/3 KV.
In addition, the simple sleeve for the glue-impregnated fiber is provided with the voltage-sharing capacitance screen at least one end part of the sleeve to share the voltage of the end part, and a voltage-sharing ball is not needed, so that the cost is low, the size is small, and the assembly and the maintenance are convenient.
Drawings
FIG. 1 is a cross-sectional view of a simple sleeve for glue impregnated fiber in accordance with the present invention;
FIG. 2 is an enlarged view of a portion of the construction of the glue-impregnated fiber sleeve of the present invention.
In the figure 1, a capacitive screen; 2. a cavity; 3. an insulating core; 4. a high-voltage capacitive screen (0 screen); 5. equipotential connecting lines; 6. a voltage-sharing capacitive screen; 7. and (6) installing a flange.
Detailed Description
The following embodiments are given in conjunction with fig. 1 to 2 to further illustrate the embodiments of the glue-impregnated fiber short cut sleeve of the present invention. The glue impregnated fiber short cut sleeves of the present invention are not limited to the description of the following examples.
As shown in fig. 1-2, an embodiment of a glue-impregnated fiber simple sleeve includes a sleeve insulating core 3, where the sleeve insulating core 3 includes a plurality of insulating layers and a plurality of capacitive screens 1 wound alternately, a cavity 2 is formed in the sleeve insulating core 3, the insulating layers are formed by winding glass fibers impregnated with epoxy resin, and no liner is arranged in the cavity 2 of the sleeve insulating core 3. The simple sleeve for the glue-impregnated fiber does not need to be provided with a lining pipe, and products with the same specification greatly reduce the volume and the weight and the cost on the basis of keeping the same cavity diameter.
As shown in fig. 1, an embodiment of a simple glue-impregnated fiber bushing for a transformer includes a bushing insulating core 3, a cavity 2 is axially disposed on the bushing insulating core 3, and an insulating shed is disposed outside the bushing insulating core 3. The simple and direct sleeve pipe of fibre is soaked in glue of this embodiment is the transformer bushing, and sleeve pipe insulating core 3 axial middle part outside is equipped with mounting flange 7 and is divided into two sections from top to bottom with sleeve pipe insulating core 3, two sections are first insulating core section and second insulating core section from top to bottom, and wherein the second insulating core section is used for inserting inside the transformer and usually soaks in oil, mounting flange 7 and transformer fixed connection, and first insulating core section is located outside the transformer, is equipped with the insulating full skirt outside first insulating core section, and the tip of first insulating core section is equipped with binding post, and the conductor in the transformer passes cavity 2 is connected with binding post, does not set up the electric conduction tube as bushing in the cavity 2.
The sleeve insulating core body 3 comprises a plurality of insulating layers and a plurality of capacitance screens 1 which are wound alternately, during preparation, glass fibers soaked in epoxy resin are wound on a columnar mould to serve as the insulating layers, conductor materials or semi-conductive materials or a mixed braided belt of the insulating fibers and conductive fibers serve as the capacitance screens, the insulating layers and the capacitance screens are wound alternately, after solidification, the mould is demoulded to form the sleeve insulating core body 3, and then an installation flange 7 is installed on the sleeve insulating core body 3, an insulating umbrella skirt is sleeved on the sleeve insulating core body, and a wiring terminal is installed on the sleeve insulating core body. The insulating umbrella skirt is made of insulating silicon rubber, the conductor material, the semi-conductive material, the insulating fiber and the conductive fiber are all materials which are purchased in the market at present, the conductor material is copper foil or aluminum foil and the like, the semi-conductive material is semiconductor foil, and the insulating fiber can be fiber made of glass fiber or other insulating materials. Compared with the prior art with insulating layer and electric capacity screen coiling on copper pipe or aluminum pipe as interior bushing pipe, with the scheme that the contact tube was regarded as the conductor or let the conductor pass, bushing pipe is not set up to the insulating core 3 of sleeve pipe of this embodiment for on the product of the same specification keeps the same cavity diameter, the diameter of every insulating layer and electric capacity screen all corresponding dwindles, makes the volume and the weight of insulating core 3 of sleeve pipe reduce greatly, cost greatly reduced. For example, 110KV casing, 1/2,220KV product can reach 1/3 KV.
As shown in fig. 1-2, a plurality of coaxial capacitive screens 1 in the bushing insulating core 3 include a plurality of main capacitive screens constituting a main capacitor, the innermost of the main capacitive screen is a high-voltage capacitive screen 4, the outermost ground capacitive screen is electrically connected to a terminal, the ground capacitive screen is grounded through a mounting flange 7, the plurality of main capacitive screens gradually shrink from the two ends of the bushing insulating core 3 to the middle along the axial direction from inside to outside in a stepped manner, the length of each main capacitive screen is gradually shortened, and a plurality of capacitors formed by a plurality of adjacent main capacitive screens gradually reduce the high voltage on the inner side to the low voltage on the outer side in a graded manner, so that high-voltage insulation is realized.
Preferably, the plurality of capacitive screens 1 in the bushing insulating core 3 further include a voltage-dividing capacitive screen forming a voltage-dividing capacitor, the main capacitor and the voltage-dividing capacitor are connected in series to form a capacitive voltage divider, and a signal line is connected between the main capacitor and the voltage-dividing capacitor to provide a current and/or voltage signal for reflecting bushing insulation change by monitoring capacitor leakage current and/or reflecting partial discharge and capacitance by an algorithm. The voltage-dividing capacitive screen is wound on the outer side of the main capacitive screen, or a tap is directly led out from the penultimate main capacitive screen on the outer side of the main capacitive screen to be used as a signal wire, and the two capacitive screens which are arranged on the outer side of the main capacitive screen in the penultimate mode are used as the voltage-dividing capacitive screen. Typically the signal lines lead from the mounting flange 7.
Preferably, a plurality of electric capacity screens 1 in the sleeve pipe insulation core 3 still include the shielding electric capacity screen (not shown in the figure) that constitutes shielding electric capacity, and shielding electric capacity screen is the coiling outside main electric capacity screen and partial pressure electric capacity screen, and from sleeve pipe insulation core both ends to ground capacitance screen coiling mutual insulation again a set of electric capacity screen of mutual overlap, shielding electric capacity plays the shielding guard action, establishes shielding electric capacity and does not receive external environment to influence in order to guarantee monitoring signal's stability. Obviously, only the main capacitive screen, or only the main capacitive screen and the voltage-dividing capacitive screen, or the main capacitive screen, the voltage-dividing capacitive screen and the shielding capacitive screen can be arranged according to needs.
Preferably, one or more secondary windings (not shown) of a current transformer are provided around the bushing insulating core 3 to provide current signal measurement and high voltage power supply functions.
Preferably, another important improvement point of the present invention is that a voltage-sharing capacitance screen 6 is arranged in at least one end part of the bushing insulating core body 3, the voltage-sharing capacitance screen 6 is electrically connected with the high-voltage capacitance screen 4, the two voltage-sharing capacitance screens are equipotential and used for equalizing an electric field of the end part, a voltage-sharing ball is not required to be arranged, the cost is low, the size is small, and the assembly and the maintenance are convenient. As shown in fig. 2, a small voltage-sharing capacitive screen 6 is wound on the high-voltage capacitive screen 4 at the end of the bushing insulating core 3, and the voltage-sharing capacitive screen 6 is electrically connected with the high-voltage capacitive screen 4 through an equipotential connecting line 5. The high-voltage capacitor screen 4 extends the axial direction of the sleeve insulating core 3 and extends from one end to the other end, the voltage-sharing capacitor screen 6 is closer to the end part corresponding to the sleeve insulating core 3 than other capacitor screens 1 except the high-voltage capacitor screen 4, is wound outside the high-voltage capacitor screen 4 and is equipotentially connected with the high-voltage capacitor screen 4 through the equipotential connecting line 5. The present embodiment provides a voltage-sharing capacitive screen 6 only in the ends of the second insulating core section, and it is obvious that different bushings can be provided with a voltage-sharing capacitive screen 6 at both ends, as desired.
The utility model also provides a second embodiment of the simple sleeve of the impregnated fiber, which is a wall bushing, the wall bushing comprises a bushing insulating core body 3, the structure of the bushing insulating core body 3 is basically the same as that of the first embodiment, the wall bushing comprises a plurality of insulating layers and a plurality of capacitive screens 1 which are wound alternately, a cavity 2 is formed in the bushing insulating core body 3, and no lining pipe is arranged in the cavity 2 of the bushing insulating core body 3. Preferably, the difference from the first embodiment is that voltage-sharing capacitance screens 6 are arranged at two ends of the bushing insulating core 3, and the two voltage-sharing capacitance screens 6 are respectively connected with the high-voltage capacitance screen 4 without arranging a voltage-sharing ring or a voltage-sharing ball or a voltage-sharing flange. The middle part outside of sleeve pipe insulating core 3 is equipped with grounded mounting flange 7, and both ends set up binding post respectively, sets up the conductor of connecting both ends binding post in the cavity 2, and the conductor passes cavity 2 and connects between two binding post. The sleeve insulating core body 3 is divided into two sections by the mounting flange 7, and insulating umbrella skirts are arranged on the outer sides of the two sections.
The foregoing is a more detailed description of the utility model in connection with specific preferred embodiments and it is not intended that the utility model be limited to these specific details. For those skilled in the art to which the utility model pertains, several simple deductions or substitutions can be made without departing from the spirit of the utility model, and all shall be considered as belonging to the protection scope of the utility model.
Claims (10)
1. The utility model provides a simple and direct sleeve pipe of fibre is soaked in glue, includes sleeve pipe insulation core (3), sleeve pipe insulation core (3) are including a plurality of insulating layers and a plurality of electric capacity screen (1) of coiling in turn, the insulating layer forms for soaking epoxy's glass fiber coiling, forms cavity (2), its characterized in that in sleeve pipe insulation core (3): the cavity (2) of the sleeve insulating core body (3) is not internally provided with a lining pipe.
2. The glue impregnated fiber short cut sleeve according to claim 1, wherein: the coaxial capacitive screens (1) in the sleeve insulating core body (3) comprise a plurality of main capacitive screens forming a main capacitor, wherein the innermost side of each main capacitive screen is a high-voltage capacitive screen (4), and the outermost side of each main capacitive screen is a grounded capacitive screen; a voltage-sharing capacitor screen (6) is arranged in at least one end of the sleeve insulating core body (3), and the voltage-sharing capacitor screen (6) is electrically connected with the high-voltage capacitor screen (4).
3. The glue impregnated fiber short cut sleeve according to claim 2, wherein: the voltage-sharing capacitance screen (6) is closer to the end part corresponding to the sleeve insulating core body (3) than other capacitance screens (1) except the high-voltage capacitance screen (4), and is wound outside the high-voltage capacitance screen (4).
4. The glue impregnated fiber short cut sleeve according to claim 2, wherein: a plurality of capacitive screens (1) in the sleeve insulating core body (3) further comprise voltage division capacitive screens forming voltage division capacitors, the main capacitors and the voltage division capacitors are connected in series to form a capacitive voltage divider, and signal wires are connected between the main capacitors and the voltage division capacitors.
5. The glue impregnated fiber short cut sleeve according to claim 4, wherein: a plurality of capacitive screens (1) in the sleeve insulating core (3) also include the shielding capacitive screen that constitutes shielding capacitance, and shielding capacitive screen is the coiling outside main capacitive screen and partial pressure electric capacity screen, and from sleeve insulating core both ends to ground electric capacity screen coiling mutual insulation and a set of capacitive screen of mutual telescope again.
6. The glue impregnated fiber simple sleeve according to any one of claims 1 to 5, characterized in that: an insulating umbrella skirt is sleeved outside the sleeve insulating core body (3).
7. The glue impregnated fiber simple sleeve according to any one of claims 1 to 5, characterized in that: one or more secondary coils of the current transformer are sleeved outside the sleeve insulating core body (3).
8. The glue impregnated fiber short cut sleeve according to claim 2, wherein: the insulating core of sleeve pipe (3) axial middle part outside is equipped with mounting flange (7) and divide into two sections about insulating core of sleeve pipe (3), two sections are first insulating core section and second insulating core section from top to bottom, are equipped with insulating full skirt outside first insulating core section, and the tip of first insulating core section is equipped with binding post, sets up voltage-sharing capacitance screen (6) in the tip of second insulating core section.
9. The glue impregnated fiber short cut sleeve according to claim 2, wherein: both ends of the sleeve insulating core body (3) are provided with voltage-sharing capacitance screens (6).
10. The glue impregnated fiber short cut sleeve according to claim 1, wherein: the capacitive screen (1) is formed by winding a conductor material, a semi-conductive material or a mixed braided belt of insulating fibers and conductive fibers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121771054.XU CN217008817U (en) | 2021-07-30 | 2021-07-30 | Simple sleeve for glue-dipped fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121771054.XU CN217008817U (en) | 2021-07-30 | 2021-07-30 | Simple sleeve for glue-dipped fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217008817U true CN217008817U (en) | 2022-07-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121771054.XU Active CN217008817U (en) | 2021-07-30 | 2021-07-30 | Simple sleeve for glue-dipped fiber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217008817U (en) |
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2021
- 2021-07-30 CN CN202121771054.XU patent/CN217008817U/en active Active
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