CN107785131A - A kind of micro-pressure seal box 12kV insulated sleeve components - Google Patents

Abstract

The invention provides a 12kV insulating bushing for a micro-pressure sealed box with small volume, large current passing value and good insulation effect. above the above-mentioned insulating substrate, and the position of the middle axis penetrates up and down, the current through conductors correspond to the supporting insulators one by one and are respectively arranged at the positions of the through middle axis, and the upper and lower ends of the current through conductors are exposed It is used to connect with the conductors on both sides of the insulating substrate. The supporting insulator is hollow inside to form a creepage disposal chamber. The creepage disposal chamber communicates with the central axis of the supporting insulator and has an opening under the insulating substrate. The invention has the advantages of small size, large current passing value, good insulation effect and high mechanical strength, and is completely suitable for the supporting installation of the environment-friendly, air-insulated miniaturized switchgear with a width of less than 420mm and a depth of less than 900mm.

Description

A 12kV insulating bushing assembly for a micro-pressure sealed box

technical field

The invention relates to an insulating bushing, in particular to a 12kV insulating bushing assembly for a micro-pressure sealed box.

Background technique

In the power distribution system with 12kV voltage level, the insulating bushing is one of the key accessories when the high-voltage live body in the switchgear passes through the metal body. It has a role that cannot be ignored, so the electrical and mechanical performance guarantee of the insulating bushing has become the basic acceptance index of this type of conductive insulation. In addition, it has its own minimum limit value for the creepage distance and electrical distance between the conductor and the grounding body. If it is lower than the specified value, it will be judged as unqualified or cannot be accepted.

At present, the insulating bushing under the conventional technology is mainly made of epoxy resin insulating material, the structure volume is too large, and it can only be used in a large installation space; and it can only be fully enclosed and installed in a sealed and isolated state, which is difficult to install; Moreover, in order to adapt to the large pressure difference inside and outside the switchgear under conventional technology, it is necessary to design various bushing structures without creepage structures, various types of high pressure or high density special insulating gas, so that it is suitable for 12kV micro pressure The matching application selection in the closed switchgear is cumbersome.

Contents of the invention

In view of the above-mentioned defects, the present invention provides a 12kV insulating bushing for a micro-pressure sealed box with small volume, large current passing value and good insulation effect.

The technical solution adopted by the present invention to solve the existing technical problems is as follows:

A 12kV insulating bushing assembly for a micro-pressure sealed box, which includes: an insulating substrate, a number of supporting insulators and a current-through conductor. The current-through conductors correspond to the supporting insulators one-to-one and are respectively arranged at the central axis positions of the through-through conductors. The upper and lower ends of the current-through conductors are exposed to connect with the conductors on both sides of the insulating substrate. The interior of the insulator is hollow to form a creepage disposal bin, which is connected to the central axis of the supporting insulator and has an opening below the insulating substrate.

In one or more embodiments of the present invention, the supporting insulator is in the shape of a round tower, and several rings of sheds are arranged from top to bottom.

In one or more embodiments of the present invention, several creepage reinforcing ribs are arranged on the insulating substrate.

In one or more embodiments of the present invention, the creepage-strengthening ribs at least include inner peripheral creepage-strengthening ribs surrounding the support insulator.

In one or more embodiments of the present invention, the creepage reinforcing ribs further include peripheral creepage reinforcing ribs located on the periphery of the insulating substrate.

In one or more embodiments of the present invention, the creepage reinforcing ribs are arranged on the upper surface and/or the lower surface of the insulating substrate.

In one or more embodiments of the present invention, the insulating substrate is in the shape of a strip, on which several supporting insulators are arranged side by side, and at least one creepage reinforcing rib is arranged between two supporting insulators.

In one or more embodiments of the present invention, the insulating substrate, supporting insulators and creepage reinforcing ribs are integrally formed of SMC materials.

In one or more embodiments of the present invention, a mounting insert is formed on the lower surface of the insulating substrate, and the mounting insert is a ring-shaped flange on the edge of the lower surface of the insulating substrate, and on the ring-shaped flange Embedding holes penetrating through the upper and lower surfaces of the insulating substrate are provided.

In one or more embodiments of the present invention, the creepage disposal bin is filled with insulating colloid.

Due to the adoption of the above-mentioned technical scheme, the present invention has the following beneficial effects compared with the prior art: first, the structure is simple and effective, the area of the insulating substrate can be limited to 620mm×150mm, the height of the conductor is less than 95mm, and the occupied space is small . Second, the present invention adopts SMC composite material, and molds the insulating substrate, supporting insulator and creepage reinforcing rib as a whole under high temperature and high pressure. It has a unique structure and excellent characteristics, high insulation, high strength, high toughness, and aging resistance , Corrosion resistance, non-absorbent, high temperature resistance, and less prone to pollution flashover and other electrical and mechanical properties, which improve the overall performance. Third, the present invention realizes the insulation operation capacity guarantee of not less than 12kV operating voltage and passing current not less than 1250A under the micro-pressure dry air insulation environment through the preset copper bus current conduction and reserved connection disposal bin structure, and the completion is not more than The dual effects of 95mm height insulation treatment, conductor structure support and insulation creepage distance treatment. Fourth, when insulating colloid is poured into the creepage distance disposal bin of the present invention, it can further block the direct gas flow path between the upper and lower ends of the conductor, realize the limit enhancement of the distance of the charged creepage distance of the charged body, and improve the distance of the conductor The creepage insulation performance of the external connector of the lower end of the external conductor also enables this insulating sleeve with a substrate to achieve electrical conduction between the two ends of the supporting insulator in the height direction although the height does not exceed 95mm. The demand for connecting parts can easily solve the problem of surface creepage insulation of this part to the insulating substrate.

Description of drawings

FIG. 1 is a schematic diagram of the overall structure of a 12kV insulating bushing assembly for a micro-pressure sealed box of the present invention.

Fig. 2 is a schematic cross-sectional structure diagram of a 12kV insulating bushing assembly for a micro-pressure sealed box of the present invention.

Fig. 3 is a cross-sectional view of the supporting insulator of the 12kV insulating bushing assembly for the micro-pressure sealed box of the present invention.

Fig. 4 is a structural view of a 12kV insulating bushing assembly for a micro-pressure sealed box according to the present invention.

Fig. 5 is a structural diagram of a 12kV insulating bushing assembly for a micro-pressure sealed box of the present invention, viewed from the bottom.

Fig. 6 is a structure diagram of a conductor of a 12kV insulating bushing assembly for a micro-pressure sealed box of the present invention.

Detailed ways

The scheme of this application is further described in conjunction with accompanying drawings 1 to 6 as follows:

A 12kV insulating bushing assembly for a micro-pressure sealed box, which includes: an insulating substrate 1 (with a surface area size smaller than 620mm×150mm), several supporting insulators 2 and a current-through conductor 3 (height is less than 95mm), and the supporting insulator 2 is set On the insulating substrate 1, and its central axis position penetrates up and down, the current through conductors 3 correspond to the supporting insulators 2 one by one and are respectively arranged at the through central axis positions, and the current through conductors 3 The upper and lower ends 3a, 3b are exposed to connect with the conductors on both sides of the insulating substrate 1. The interior of the support insulator 2 is hollow to form a creepage disposal bin 20, and the creepage disposal bin 20 is connected to the middle of the support insulator 2. The shaft position is through, and it has an opening 200 under the insulating substrate 1. The supporting insulator 2 is in the shape of a round tower, and has four sets of sheds 21 from top to bottom.

The insulating substrate 1 is provided with a number of creepage reinforcing ribs 4, the creepage reinforcing ribs 4 include an inner peripheral creepage reinforcing rib 4a arranged around the support insulator 2, and a peripheral creepage reinforcing rib 4a located on the periphery of the insulating substrate 1. The ribs 4b are a plurality of ring-shaped raised ribs surrounding the support insulator 2 ;

The insulating substrate 1 is in the shape of a strip, on which several supporting insulators 2 are arranged side by side, and at least one creepage reinforcing rib 4 is arranged between two supporting insulators 2 .

The insulating substrate 1, supporting insulator 2 and creepage reinforcing rib 4 are integrally formed of SMC material, which has a unique structure and excellent characteristics, high insulation, high strength, high toughness, aging resistance, corrosion resistance, non-absorbent, high temperature resistance , Pollution flashover and other electrical and mechanical properties are not easy to occur, which improves the overall performance.

Note: SMC composite material is the abbreviation of Sheet molding compound, that is, sheet molding compound. The main raw materials are composed of GF (special yarn), UP (unsaturated resin), low shrinkage additive, MD (filler) and various auxiliary agents.

A mounting insert 5 is formed on the lower surface of the insulating substrate 1, and the mounting insert 5 is an annular flange 51 on the edge of the lower surface of the insulating substrate, and the annular flange 51 is provided with a , The embedded hole 52 on the lower surface.

The creepage disposal bin 20 is used to increase the surface distance of the insulating structural member. In particular, the creepage disposal bin 20 can also be used to perfuse the insulating colloid 6 to further block the connection between the upper and lower ends of the conductor. The direct air flow path realizes the extreme enhancement of the creepage distance of the electrified body, and improves the creepage insulation performance of the external connector of the external conductor at the lower end of the current penetrating conductor 3 .

Just because of the structure of the creepage disposal bin 20 of the supporting insulator 2, the insulating bushing with the insulating substrate 1 realizes the electrical conduction between the two ends of the supporting insulator 2 in the height direction although the height does not exceed 95mm. According to the requirements of externally connected components, the insulation problem of the surface creepage distance of this component to the insulating substrate 1 can be easily dealt with. The switchgear adopting the insulating bushing assembly has the ability to adapt to space miniaturization and insulation disposal under micro-pressure conditions.

In the present invention, through the preset copper busbar current conduction and the reserved connection creepage distance disposal bin structure, the operating voltage of not less than 12kV and the passing current of not less than 1250A can be guaranteed in the micro-pressure dry air insulation environment, and the completion is not more than 95mm The dual effects of high insulation treatment, conductor structure support and insulation creepage distance treatment. When the insulating colloid is poured into the creepage disposal chamber of the present invention, the direct gas flow path between the upper and lower ends of the conductor can be further blocked, the distance of the charged creepage distance of the charged body can be enhanced to the limit, and the lower end of the conductor can be improved to conduct externally The creepage insulation performance of the external connectors of the body also enables this insulating sleeve with a substrate to achieve electrical conduction between the two ends of the supporting insulator with a height of no more than 95mm, and at the same time, it can be in accordance with the requirements of the external connecting parts. Requirements, it is easy to solve the surface creepage insulation problem of this part to the insulating substrate.

The above-mentioned preferred implementation mode should be regarded as an illustration of the implementation mode of the scheme of this application, and any technical deduction, replacement, improvement, etc. that are similar to, similar to, or based on the scheme of this application should be regarded as the scope of protection of this patent.

Claims (10)

1. A kind of 1. micro-pressure seal box 12kV insulated sleeve components, it is characterised in that including：Insulated substrate, some supports are exhausted Edge and electric current insertion electric conductor, the supporting insulator are arranged on the insulated substrate, and on its middle part shaft position Lower insertion, the electric current insertion electric conductor correspond with support support insulator and are respectively arranged at the middle part axle position of the insertion Put, the upper/lower terminal of electric current insertion electric conductor is exposed to be used to connect with the conductor of insulated substrate both sides, in the supporting insulator Portion is hollow to dispose storehouse formed with creep distance, and the middle part shaft position insertion of the creep distance disposal storehouse and supporting insulator, it has in exhausted Opening below edge substrate.
2. 2. micro-pressure seal box 12kV insulated sleeve components according to claim 1, it is characterised in that：The support is exhausted Edge is in circular tower shape, and is from top to bottom provided with some circle full skirts.
3. 3. micro-pressure seal box 12kV insulated sleeve components according to claim 1, it is characterised in that：The insulation base Some creep distance enhancing muscle are provided with plate.
4. 4. micro-pressure seal box 12kV insulated sleeve components according to claim 2, it is characterised in that：The creep distance increases Strengthening tendons is provided with the interior creep distance that encloses including at least the circular supporting insulator strengthens muscle.
5. 5. micro-pressure seal box 12kV insulated sleeve components according to claim 3, it is characterised in that：The creep distance increases Strengthening tendons also includes the peripheral creep distance enhancing muscle positioned at insulated substrate periphery.
6. 6. the micro-pressure seal box 12kV insulated sleeve components according to claim 3 or 4 or 5, it is characterised in that：It is described Creep distance enhancing muscle is arranged at the upper surface and/or lower surface of insulated substrate.
7. 7. micro-pressure seal box 12kV insulated sleeve components according to claim 1, it is characterised in that：The insulation base Plate is in strip, and several supporting insulators have been arranged side by side thereon, is climbed two-by-two between supporting insulator at least provided with one Away from enhancing muscle.
8. 8. the micro-pressure seal box 12kV insulated sleeve components according to any one of claim 1-5 or described in 7, its feature exist In：The insulated substrate, supporting insulator and creep distance enhancing muscle are integrally formed by SMC material.
9. 9. the micro-pressure seal box 12kV insulated sleeve components according to any one of claim 1-5 or described in 7, its feature exist In：The insulated substrate lower surface is convex for the ring-type of insulated substrate lower surface edge formed with installation inserts, the installation inserts Side, and it is provided with the inlaid hole through the upper and lower surface of insulated substrate in the annular rim.
10. 10. the micro-pressure seal box 12kV insulated sleeve components according to any one of claim 1-5 or described in 7, its feature exist In：Insulation colloid is perfused with the creep distance disposal storehouse.