Composite insulator capable of improving pollution flashover

Abstract

The utility model discloses a composite insulator capable of improving pollution flashover, which belongs to the technical field of insulators and comprises a steel foot, a porcelain piece arranged on the steel foot, a steel cap arranged on the porcelain piece, a plurality of annular grooves arranged on the porcelain piece along the length direction, and antifouling rubber belts arranged in the annular grooves. Compared with single-layer silicon rubber coating, the ceramic piece-antifouling rubber belt-ceramic piece-antifouling rubber belt alternate composite structure can more effectively maintain hydrophobicity, even if local silicon rubber is aged, partial unaged rubber can still maintain the overall hydrophobic characteristic, pollution flashover is prevented, and the service life of the ceramic piece-antifouling rubber belt-ceramic piece-antifouling rubber belt is prolonged. The problem of hydrophobicity attenuation caused by aging of the whole rubber in the all-composite insulator is avoided, dirt adhesion is reduced, the anti-pollution flashover capability is enhanced, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to insulator technical field, specifically a kind of composite insulator of improving pollution flashover. BACKGROUND

[0002] In high-voltage transmission line and transformer substation, suspension insulator is important equipment to guarantee the safe operation of power system. Its main function is to support the wire and provide insulation, to prevent current through insulator string ground. However, in high humidity, heavy pollution, coastal, industrial pollution and other environments, the surface of insulator is easy to accumulate pollution and water film, leading to the occurrence of pollution flashover. Pollution flashover is due to the surface of insulator pollution absorbs moisture, forms soluble electrolyte solution, under the action of electric field, leakage current is generated, eventually leading to along surface breakdown discharge. Pollution flashover accident can cause power supply interruption, affect the stability of power grid, and even cause large-scale power outage, therefore, improving the anti-pollution flashover ability of suspension insulator is an important research direction of current electric power industry.

[0003] At present, for the problem of pollution flashover, the traditional technical scheme mainly adopts full composite insulator, and the full composite insulator adopts epoxy glass fiber core rod as insulating support structure, and the outside is coated with vulcanized silicone rubber, but there is the problem of hydrophobicity attenuation after long-term operation, leading to pollution flashover. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of composite insulator of improving pollution flashover to solve at least one aspect of the problems and defects proposed in the above background technology.

[0005] A kind of composite insulator of improving pollution flashover is provided, including steel foot, the steel foot is provided with porcelain piece, the porcelain piece is provided with steel cap, the porcelain piece is provided with several ring grooves along the length direction, and several ring grooves are all provided with anti-pollution rubber belt.

[0006] Further, the cross section of the ring groove is semicircular arc, the traditional right angle or trapezoidal groove is easy to form high field intensity area at the corner, leading to partial discharge, and then accelerating surface pollution accumulation, the semicircular arc ring groove can smooth electric field distribution, avoid electric field concentration, improve withstand voltage level, reduce the risk of surface discharge, the semicircular arc ring groove has more uniform stress distribution, can reduce the rubber cracking caused by thermal expansion and contraction or mechanical vibration, ensure long-term stability.

[0007] Further, the ring groove is all provided with several limiting columns along the circumferential direction, and the anti-pollution rubber belt is clamped on the several limiting columns, the anti-pollution rubber belt can be fixed at multiple points by clamping limiting column, even if it is impacted by external environment or rubber material aging, it can also be stably kept in the groove, and the uniform arrangement of limiting column ensures that the anti-pollution rubber belt stably adheres to the inner wall of the groove, avoids local separation, and improves the overall anti-pollution flashover performance of the insulator.

[0008] Further, the bottom of the anti-fouling rubber belt is provided with a plurality of limiting holes in the circumferential direction, a plurality of limiting columns are clamped in the plurality of limiting holes, the plurality of limiting holes and the limiting columns are matched in size, the rubber belt can be clamped in the groove firmly through the accurate matching of the limiting holes and the limiting columns, and is fixed by mechanical fitting force, so that the rubber belt cannot be loosened even after long-term operation, the clamping structure combined with the limiting holes and the limiting columns can realize quick disassembly and replacement, when the anti-fouling rubber belt is aged or damaged, only the rubber belt needs to be replaced, and the whole insulator does not need to be replaced.

[0009] Further, the distance D between the plurality of ring-shaped grooves is 5-6cm, the spacing of the ring-shaped grooves is too small, the anti-fouling silicone rubber layer is too dense, and the mechanical strength is reduced, the spacing of the ring-shaped grooves is too large, and sufficient hydrophobic structure cannot be formed, and the anti-flashover effect is affected, preferably, therefore, the spacing between the ring-shaped grooves is D 5-6cm, so that the anti-fouling performance is ensured, and the mechanical strength is maintained.

[0010] Further, the anti-fouling rubber belt is made of room temperature vulcanized rubber material, the RTV rubber has strong hydrophobicity and is not easy to absorb dirt, can form dry and wet alternating regions in a high humidity environment, prevent soluble salts from forming a conductive path, cover the porcelain disc surface by the rubber belt to reduce the exposed part, reduce the risk of pollution flashover, form dry and wet alternating regions, make it difficult for the current to form a complete discharge path along the porcelain disc surface, reduce the leakage current through the interval anti-fouling layer, and improve the overall anti-pollution flashover voltage of the insulator.

[0011] Further, cement adhesive is arranged between the steel foot and the porcelain piece, and cement adhesive is arranged between the porcelain piece and the steel cap, the cement adhesive is an inorganic adhesive material specially used for assembling power insulators, mainly composed of silicate cement, aluminate cement or modified epoxy cement. Its principle is to form a hard solid body through hydration reaction or polymerization curing, so that the porcelain piece and the metal part (steel foot, steel cap) are firmly bonded to form a stable overall structure.

[0012] Compared with the prior art, the utility model has the advantages that:

[0013] The porcelain piece-anti-fouling rubber belt-porcelain piece-anti-fouling rubber belt alternating composite structure can more effectively maintain hydrophobicity compared to single-layer silicon rubber coating, even if the local silicon rubber ages, the part of un-aged rubber can still maintain the overall hydrophobicity, preventing the occurrence of pollution flashover, since the anti-fouling rubber belt is filled in the ring-shaped groove, the material has excellent hydrophobicity and weather resistance, and can maintain long-term stability, avoiding the problem that the overall outer rubber of the composite insulator ages and causes the hydrophobicity to decay, reducing pollution adhesion, enhancing the anti-pollution flashover capability, prolonging the service life, by arranging the ring-shaped groove on the porcelain piece, forming a dry-wet alternating insulation structure, so that the moisture and pollution cannot uniformly cover the entire surface, thereby destroying the conduction path and reducing the pollution flashover risk.

[0014] In addition, the replaceable anti-fouling rubber belt can be replaced when the rubber belt ages, without affecting the overall insulator structure, reducing maintenance costs and prolonging the service life of the insulator. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to facilitate those skilled in the art to understand, the present application will be further described below in conjunction with the drawings.

[0016] Figure 1 It is a schematic diagram of the overall structure of a composite insulator for improving pollution flashover.

[0017] Figure 2 It is Figure 1 It is an enlarged schematic diagram of the structure of region A.

[0018] Figure 3 It is a schematic diagram of the porcelain piece structure provided by the present application.

[0019] Figure 4 It is a schematic diagram of the top view structure of the porcelain piece provided by the present application.

[0020] In the figure: 1, steel foot; 2, porcelain piece; 3, steel cap; 4, ring-shaped groove; 41, limiting column; 5, anti-fouling rubber belt; 51, limiting hole; 6, cement adhesive. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be described and explained below in conjunction with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application. Based on the examples provided by the present application, all other examples obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0022] It is apparent that the drawings in the following description merely show some examples or embodiments of the present application, and the present application can be applied to other similar situations without creative labor by those skilled in the art based on these drawings. In addition, it can be understood that although the efforts made in this development process can be complex and lengthy, some design, manufacture or production changes based on the technical content disclosed in the present application are only routine technical means for those skilled in the art related to the content disclosed in the present application, and should not be understood as insufficient disclosure of the content disclosed in the present application.

[0023] However, unnecessary detailed descriptions can be omitted. For example, there are cases where detailed descriptions of well-known matters, repeated descriptions of actually identical structures are omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate understanding by those skilled in the art. In addition, the drawings and the following description are provided to enable those skilled in the art to fully understand the present application, and are not intended to limit the subject matter recited in the claims.

[0024] Referring to Figures 1-4 In the embodiment of the utility model, a kind of composite insulator for improving pollution flashover, including steel foot 1, steel foot 1 is provided with porcelain piece 2, steel cap 3 is provided on porcelain piece 2, and a plurality of ring grooves 4 are provided along the length direction on porcelain piece 2, and a plurality of ring grooves 4 are all provided with anti-fouling rubber belt 5;

[0025] The alternative composite structure of porcelain piece 2-anti-fouling rubber belt 5-porcelain piece 2-anti-fouling rubber belt 5, compared with single layer silicon rubber coating, multilayer structure can more effectively maintain hydrophobicity, even if partial silicon rubber aging, part of the rubber that has not aged can still maintain overall hydrophobicity, prevent pollution flashover from occurring, since anti-fouling rubber belt 5 is filled in ring groove 4, anti-fouling rubber belt 5 has excellent hydrophobicity and weather resistance, and can maintain long-term stability, avoid the problem that the hydrophobicity of the overall rubber of the outer layer of the composite insulator is attenuated due to aging, reduce pollution adhesion, enhance anti-pollution flashover capability, prolong service life, by being provided with ring groove 4 on porcelain piece 2, form the insulating structure of dry and wet alternation, so that moisture and pollution cannot uniformly cover the entire surface, thereby destroying the conduction path, reduce pollution flashover risk, in addition, replaceable anti-fouling rubber belt 5 is used, when anti-fouling rubber belt 5 ages, damaged part can be replaced individually, without affecting the entire insulator structure, reduce maintenance cost, prolong the service life of insulator.

[0026] In one embodiment, referring to Figure 1 , Figure 2 and Figure 3As shown, the cross section of the ring-shaped groove 4 is a semicircular arc. Traditional right-angle or trapezoidal grooves are prone to form high field strength areas at the corners, causing partial discharge, which in turn accelerates the accumulation of surface contamination. The semicircular arc-shaped ring-shaped groove 4 can smooth the electric field distribution, avoid electric field concentration, improve the withstand voltage level, reduce the risk of surface discharge, and has a more uniform stress distribution, which can reduce the cracking of rubber caused by thermal expansion and contraction or mechanical vibration, and ensure long-term stability.

[0027] In one embodiment, referring to Figure 2 and Figure 4 As shown, a plurality of limiting columns 41 are arranged in the circumferential direction inside the ring-shaped groove 4, and a plurality of anti-fouling rubber strips 5 are clamped on the plurality of limiting columns 41. Through clamping by the limiting columns 41, the anti-fouling rubber strips 5 can be fixed at multiple points, and can be stably maintained in the ring-shaped groove 4 even if subjected to external impact or rubber material aging. The uniform arrangement of the limiting columns 41 ensures that the anti-fouling rubber strips 5 stably adhere to the inner wall of the ring-shaped groove 4, avoiding local detachment and improving the overall anti-fouling flashover performance of the insulator.

[0028] In one embodiment, referring to Figure 1 , Figure 2 and Figure 3 As shown, a plurality of limiting holes 51 are arranged in the circumferential direction at the bottom of the anti-fouling rubber strip 5, and a plurality of limiting columns 41 are clamped in the plurality of limiting holes 51. The plurality of limiting holes 51 and the limiting columns 41 are matched in size. Through the precise matching of the limiting holes 51 and the limiting columns 41, the anti-fouling rubber strip 5 can be firmly clamped in the ring-shaped groove 4 and fixed by mechanical fitting force, and will not loosen even after long-term operation. The clamping structure combined with the limiting holes 51 and the limiting columns 41 can realize quick disassembly and replacement. When some anti-fouling rubber strips 5 are aged or damaged, only the damaged and aged anti-fouling rubber strips 5 need to be replaced, without the need to replace the entire insulator. In addition, in extreme environments, the anti-fouling rubber strip 5 may be loosened or shifted. At this time, a small amount of weather-resistant silicone adhesive can be applied at the contact between the limiting hole 51 and the limiting column 41 to improve long-term stability.

[0029] In one embodiment, referring to Figure 2 , Figure 3 and Figure 4 As shown, the distance D between the plurality of ring-shaped grooves 4 is 5-6 cm. If the distance between the ring-shaped grooves 4 is too small, the anti-fouling rubber strips 5 will be too dense, resulting in a decrease in mechanical strength. If the distance between the ring-shaped grooves 4 is too large, it will not form sufficient hydrophobic structures, affecting the anti-fouling flashover effect. Therefore, the distance D between the ring-shaped grooves 4 is preferably 5-6 cm, ensuring the anti-fouling performance while maintaining the mechanical strength.

[0030] In one embodiment, referring to Figure 1As shown, the anti-fouling rubber belt 5 is an anti-fouling rubber belt made of room temperature vulcanized rubber material (RTV rubber), the RTV rubber has strong hydrophobicity and is not easy to absorb dirt, can form dry and wet alternating regions in high humidity environment, prevent soluble salts from forming conductive paths, through the coverage of the rubber belt, reduce the exposed part of the porcelain 2 surface, reduce the risk of pollution flashover, form dry and wet alternating regions, make it difficult for the current to form a complete discharge path along the surface of the porcelain 2, through the interval anti-fouling layer, reduce the leakage current, and improve the overall anti-pollution flashover voltage of the insulator.

[0031] In one embodiment, referring to Figure 1 , Figure 2 and Figure 3 , cement adhesive 6 is arranged between the steel foot 1 and the porcelain 2, and cement adhesive 6 is arranged between the porcelain 2 and the steel cap 3, the cement adhesive 6 is an inorganic adhesive material specially used for assembling power insulators, the cement adhesive 6 is selected from high-strength modified aluminate cement (such as CA-70) or cement adhesive 6 of MPA-SZ series recommended by State Grid standard, the cement adhesive 6 has high early strength, high bonding force and good environmental stability, is suitable for insulating fixation between the porcelain 2 and the metal part, and makes the porcelain 2 and the metal part (the steel foot 1 and the steel cap 3) firmly bonded to form a stable overall structure.

[0032] The above is only an example and description of the structure of the utility model, and those skilled in the art can make various modifications or supplements or adopt similar ways to replace the described specific embodiments, as long as the modifications or supplements or replacements do not deviate from the structure of the utility model or exceed the range defined by the present claim, and should belong to the protection range of the utility model.

Claims

1. A composite insulator with improved pollution flashover, comprising a steel foot (1), a porcelain piece (2) is arranged on the steel foot (1), and a steel cap (3) is arranged on the porcelain piece (2), characterized in that, The porcelain piece (2) is provided with a plurality of ring-shaped grooves (4) arranged along the length direction, and the ring-shaped grooves (4) are all provided with anti-fouling rubber belts (5).

2. The composite insulator of claim 1, wherein the polymeric layer is a polymeric layer having a surface resistivity of 1 x 1010 ohm / sq or less. The cross section of the ring-shaped groove (4) is a semicircular arc shape.

3. A composite insulator for improving flashover according to claim 1, characterized in that, The ring-shaped groove (4) is internally provided with a plurality of limiting columns (41) arranged along the circumferential direction, and the limiting columns (41) are all clamped with the anti-fouling rubber belts (5).

4. A composite insulator for improving flashover according to claim 3, characterized in that, The bottom of the anti-fouling rubber belt (5) is provided with a plurality of limiting holes (51) arranged along the circumferential direction, the limiting holes (51) are all clamped with a plurality of limiting columns (41), and the limiting holes (51) and the limiting columns (41) are matched in size.

5. A composite insulator for improving flashover according to claim 1, characterized in that, The distance D between the plurality of ring-shaped grooves (4) is 5-6 cm.

6. The composite insulator of claim 1, wherein the composite insulator is a pollution flashover improving composite insulator, and the pollution flashover improving composite insulator is characterized by: The anti-fouling rubber belt (5) is made of room temperature vulcanized rubber material.

7. The composite insulator of claim 1, wherein the composite insulator is a pollution flashover improving composite insulator, and the pollution flashover improving composite insulator is characterized by: The steel foot (1) and the porcelain piece (2) are provided with cement adhesive (6), and the porcelain piece (2) and the steel cap (3) are provided with cement adhesive (6).

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