A coated disc insulator

Abstract

The present invention provides a coated disc-shaped insulator, in which N umbrella ribs are extended on the concave surface of the umbrella disk, each umbrella rib is arranged around the axis of the umbrella disk and is sequentially sleeved along the radial direction of the umbrella disk; along the radial direction of the umbrella disk from the axis of the umbrella disk to its outer periphery, each umbrella rib is sequentially recorded as the first umbrella rib, the second umbrella rib to the Nth umbrella rib; the outer wall of each umbrella rib on the exposed section and the concave surface of the umbrella disk are exposed; on the concave surface of the umbrella disk from the first preset position of the second umbrella rib to the interface between the Nth umbrella rib and the convex surface of the umbrella disk, and at least part of the convex surface of the umbrella disk is provided with an anti-pollution flashover coating. The coated disc-shaped insulator of the present invention restricts the coating position of the anti-pollution flashover coating, so that the coated disc-shaped insulator can improve the anti-pollution performance of the external insulation through the anti-pollution flashover coating, and can pass the steep wave impact breakdown test.

Description

Technical Field

[0001] The invention relates to the technical field of insulation, in particular to a disc-shaped insulator containing a coating. Background Art

[0002] Insulators play the role of mechanical support and electrical isolation on transmission lines and are one of the key components of external insulation of power systems. At present, the insulators widely used in transmission lines mainly include disc suspension porcelain, glass insulators and rod suspension composite insulators. Since RTV coatings have excellent hydrophobicity and hydrophobic migration, they can effectively improve the anti-fouling performance of external insulation of transmission lines. Therefore, a large number of existing transmission line disc suspension porcelain and glass insulators are retrofitted with anti-fouling by spraying RTV coating on the tower. Since 2015, in order to meet the demand for large-tonnage disc insulators coated with RTV in the construction of UHV DC projects in my country, the construction process of RTV coating has been changed from on-site tower spraying to factory coating, that is, the RTV coating is pre-coated on the surface of the disc insulator in the factory using an automated process, and then the disc insulator containing the RTV coating is installed on the transmission line for operation.

[0003] At present, whether it is tower spraying or factory-coated disc insulators on the market, the porcelain or glass surfaces exposed to the air are either fully covered with RTV coating, or only the insulating parts with a radial length of no more than 20mm near the steel foot are not covered with RTV coating, and the rest are all covered with RTV coating. This kind of insulator can improve the anti-pollution level of external insulation, but it cannot pass the steep wave impulse breakdown test. The steep wave impulse breakdown test is an important test item for testing the internal insulation quality of disc insulators. The national standard GB / T 20642-2006 requires that disc suspension insulators of 160kN and above should pass the steep wave impulse breakdown test with a voltage amplitude of 2.8pu (1p.u. is the single-piece average value of the standard lightning impulse 50% discharge voltage U50 of 5 strings, unit: kV). However, in recent years, during the acceptance inspection of disc insulators coated with RTV in UHV projects, it was found that even disc suspension insulators with firm adhesion to the RTV coating and no defects in internal insulation quality still could not pass the steep wave impact breakdown test, especially the 550kN large-tonnage disc suspension glass insulators, which were more prone to breakdown.

[0004] It can be seen that the disc insulator without RTV coating can pass the steep wave impact breakdown test, but its anti-fouling performance is insufficient. The disc insulator with the surface completely covered with RTV coating has excellent anti-fouling performance, but cannot pass the steep wave impact breakdown test. Summary of the invention

[0005] In view of this, the present invention proposes a disc insulator with coating and a method for coating a disc insulator, aiming to solve the problem that the existing disc insulator without coating has insufficient anti-fouling performance and the coated disc insulator cannot pass the steep wave impact breakdown test.

[0006] The present invention provides a coated disc-shaped insulator, which comprises: an iron cap, a steel foot and an umbrella disk arranged and connected therebetween; wherein the insulating member and the steel foot are connected by cement adhesive, and the exposed portion of the insulating member is the umbrella disk; N umbrella ridges are extended on the concave surface of the umbrella disk, each of the umbrella ridges is arranged around the axis of the umbrella disk and is sequentially sleeved along the radial direction of the umbrella disk; N is a positive integer and is greater than or equal to 3; along the radial direction of the umbrella disk from the axis of the umbrella disk to its periphery, each of the The umbrella edges are sequentially recorded as the first umbrella edge, the second umbrella edge to the Nth umbrella edge; an exposed section is provided on the concave surface of the umbrella disc, and the exposed section extends from the interface between the cement adhesive and the concave surface of the umbrella disc to the outer periphery of the umbrella disc to the first preset position of the second umbrella edge, and the outer walls of each umbrella edge on the exposed section and the concave surface of the umbrella disc are exposed; an anti-fouling flashover coating is at least partially provided on the concave surface of the umbrella disc from the first preset position of the second umbrella edge to the interface between the Nth umbrella edge and the convex surface of the umbrella disc, and on the convex surface of the umbrella disc.

[0007] Furthermore, the above-mentioned coated disc-shaped insulator is provided with an anti-pollution flashover coating on the concave surface of the umbrella disk from the second preset position of the i-th umbrella edge to the interface between the N-th umbrella edge and the convex surface of the umbrella disk, as well as on the convex surface of the umbrella disk; wherein i is a positive integer, and i is greater than or equal to 2 and less than or equal to N.

[0008] Furthermore, in the above-mentioned coated disc-shaped insulator, the second preset position is one of the positions on the second preset section, the second preset section is from the second starting point to the point on the bottom wall of the i-th umbrella edge that is farthest from the second starting point, and the second starting point is the interface between the i-th umbrella groove and the i-th umbrella edge.

[0009] Furthermore, in the above-mentioned coated disc-shaped insulator, the concave surface of the umbrella disk is provided with an opening at the inner periphery of the first umbrella edge, and the opening is spaced apart from the first umbrella edge.

[0010] Furthermore, in the above-mentioned coated disc-shaped insulator, any two adjacent umbrella edges are arranged at a preset distance so that an umbrella groove is provided between any two adjacent umbrella edges; and / or an umbrella groove is provided between the first umbrella edge and the hole.

[0011] Furthermore, in the above-mentioned coated disc-shaped insulator, the umbrella groove is a ring-shaped structure.

[0012] Furthermore, the extension length of the coated disc-shaped insulator gradually increases from the first ridge to the N-1 th ridge.

[0013] Furthermore, in the above-mentioned disc-shaped insulator with coating, each of the umbrella edges is an annular structure.

[0014] Furthermore, in the above-mentioned coated disc-shaped insulator, the first preset position is one of the positions on the first preset section, the first preset section is from the first starting point to the point on the bottom wall of the second umbrella edge that is farthest from the first starting point, and the first starting point is the interface between the second umbrella groove and the second umbrella edge.

[0015] Furthermore, in the above-mentioned coated disc insulator, the anti-pollution flashover coating is an RTV coating.

[0016] The coated disc-shaped insulator provided by the present invention restricts the coating position of the anti-pollution flashover coating on the disc-shaped insulator, that is, the outer wall of each rib on the exposed section and the concave surface of the disc are exposed, that is, the anti-pollution flashover coating is not coated, while the anti-pollution flashover coating is provided on the concave surface of the disc from the first preset position of the second rib to the interface between the Nth rib and the convex surface of the disc, and at least part of the convex surface of the disc. The anti-pollution flashover coating is used to improve the external insulation anti-pollution performance of the disc-shaped insulator not coated with RTV, and the steep wave breakdown resistance performance of the disc-shaped insulator is not reduced compared with the disc-shaped insulator not coated with the anti-pollution flashover coating. That is to say, the disc-shaped insulator provided with the coating can improve the external insulation anti-pollution performance through the anti-pollution flashover coating, and can pass the steep wave impact breakdown test to avoid the breakdown of the disc-shaped insulator, thereby improving the qualified rate and service life of the disc-shaped insulator. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0018] Figure 1 A schematic half-section diagram of a coated disc-shaped insulator provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] See also Figure 1, which shows the preferred structure of the coated disc-shaped insulator provided by the embodiment of the present invention. As shown in the figure, the coated disc-shaped insulator comprises: an iron cap 1, a steel foot 2 and an insulating member 3; wherein; wherein,

[0021] The insulating member 3 is arranged and connected between the iron cap 1 and the steel foot 2, and the insulating member 3 and the steel foot 2 are connected by cement adhesive 4. The exposed part of the insulating member 3 is the umbrella plate 31. Specifically, the insulating member 3 includes a head (not shown in the figure) and an umbrella plate 31. The iron cap 1 and the steel foot 2 are respectively sleeved above and below the head, and are connected by cement adhesive 4. The umbrella plate 31 is the exposed part of the insulating member 3, so the convex surface of the umbrella plate (similar to the outer surface of an umbrella, such as Figure 1 The upper surface shown in FIG. 1 is terminated at the junction position D between the umbrella plate and the iron cap 1. The cross section of the umbrella plate 31 through the axis AA can be a symmetrical figure symmetrical about the axis AA.

[0022] The concave surface of the umbrella plate 31 (similar to the inner surface of the umbrella, such as Figure 1 N umbrella edges 311 are provided on the lower surface of the umbrella plate 31, and each umbrella edge 311 is arranged along the axis of the umbrella plate 31 around the entire circumference and along the radial direction of the umbrella plate 31 from the axis AA to the outer circumference of the umbrella plate 31 (as shown in FIG. Figure 1 The right part shown in the figure is arranged in sequence in the horizontal direction from the axis AA to the right); N is a positive integer and is greater than or equal to 3; along the radial direction of the umbrella disk 31 from the axis AA of the umbrella disk 31 to its outer periphery, each umbrella edge 311 is sequentially recorded as the first umbrella edge 3111, the second umbrella edge 3112 to the Nth umbrella edge. Specifically, each umbrella edge 311 extends downward from the concave surface of the umbrella disk 31 along the axis AA of the umbrella disk 31. Of course, the umbrella edge 311 can also be arranged at an angle with the axis AA of the umbrella disk 31, and no limitation is made to it in this embodiment. Each umbrella edge 311 is arranged along the entire circumference of the umbrella disk 31, that is, the umbrella edge 311 is an annular structure, and any two adjacent umbrella edges 311 are arranged at intervals so that an umbrella groove 312 is formed between any two adjacent umbrella edges 311; wherein, the inner periphery of the first umbrella edge 3111 is as shown Figure 1 An orifice 313 is provided between the axis AA and the first umbrella edge 3111, and the orifice 313 is spaced apart from the first umbrella edge 3111 to form an umbrella groove 312. Along the radial direction of the umbrella disc 31 from the axis AA of the umbrella disc 31 to its outer periphery, the umbrella groove 312 between the orifice 313 and the first umbrella edge 3111 and the umbrella groove 312 formed between any two adjacent umbrella edges 311 are sequentially recorded as the first umbrella groove 3121, the second umbrella groove 3122 to the Nth umbrella groove. In this embodiment, four umbrella edges 311 are used as an example for description, and of course, other numbers may be used. In this embodiment, no limitation is made. Along the radial direction of the umbrella disc 31 from the axis AA of the umbrella disc 31 to its outer periphery (such as Figure 1As shown in the figure, from the axis AA to the right), each umbrella edge 311 is sequentially recorded as a first umbrella edge 3111, a second umbrella edge 3112, a third umbrella edge 3113 and a fourth umbrella edge 3114; along the radial direction of the umbrella disc 31 from the axis AA of the umbrella disc 31 to its periphery (as shown in the figure, from the axis AA of the umbrella disc 31 to the right), each umbrella edge 311 is sequentially recorded as a first umbrella edge 3111, a second umbrella edge 3112, a third umbrella edge 3113 and a fourth umbrella edge 3114; along the radial direction of the umbrella disc 31 from the axis AA of the umbrella disc 31 to its periphery (as shown in the figure, Figure 1 As shown in the figure, from the axis AA to the right), each umbrella slot 312 is sequentially recorded as a first umbrella slot 3121, a second umbrella slot 3122, a third umbrella slot 3123 and a fourth umbrella slot 3124.

[0023] The research found that the breakdown point of the steep wave impact breakdown test reveals the breakdown mechanism of the disc insulator coated with RTV under steep waves. In essence, it belongs to the electrical breakdown of the insulation inside the insulating part. The RTV coating induces the arc on the surface of the insulator to be closer to the surface of the insulator, which makes the disc insulator easy to break down on the surface of the umbrella disk. The breakdown position is at the second umbrella groove 3122.

[0024] An exposed section BC is provided on the concave surface of the umbrella plate 31. The exposed section BC extends from the interface B between the cement adhesive 4 and the concave surface of the umbrella plate 31 to the outer periphery of the umbrella plate 31 to the first preset position C of the second umbrella rib 3112. The outer walls of each umbrella rib 311 and the concave surface of the umbrella plate 31 on the exposed section BC are exposed. In other words, the portion from the interface B between the cement adhesive 4 and the concave surface of the umbrella plate 31 to the opening 313 of the first umbrella groove 3121, the first umbrella groove 3121, the first umbrella rib 3111, the second umbrella groove 3122, and the portion from the interface between the second umbrella rib 3112 and the second umbrella groove 3122 to the first preset position C of the second umbrella rib 3112 are all exposed sections BC. The exposed section BC is exposed, i.e., no coating is applied, that is, the portion from the interface B between the cement adhesive 4 and the concave surface of the umbrella plate 31 to the opening 313 of the first umbrella groove 3121, the first umbrella groove 3121, the first umbrella edge 3111, the second umbrella groove 3122, and the portion from the interface between the second umbrella edge 3112 and the second umbrella groove 3122 to the first preset position C of the second umbrella edge 3112 are not coated, i.e., no anti-fouling flashover paint is applied.

[0025] The anti-fouling flashover coating 314 is at least partially provided on the concave surface of the umbrella plate 31 from the first preset position C of the second umbrella edge 3112 to the interface between the Nth umbrella edge and the convex surface of the umbrella plate 31, and on the convex surface of the umbrella plate 31, that is, the anti-fouling flashover coating 314 is at least partially provided on the CD segment. For example, the concave surface of the umbrella plate 31 from the first preset position C of the second umbrella edge 3112 to the convex surface of the Nth umbrella edge and the umbrella plate 31 (similar to the outer surface of the umbrella, such as Figure 1, and the convex surface of the umbrella disc 31, the anti-fouling flashover coating 314 may be partially or completely provided on the interface of the umbrella disc 31 and the upper surface shown in the figure, and the convex surface of the umbrella disc 31, which is not limited in this example. Specifically, the anti-fouling flashover coating 314 is provided on the concave surface of the umbrella disc 31 from the second preset position of the i-th umbrella edge to the interface of the N-th umbrella edge and the convex surface of the umbrella disc 31, and the convex surface of the umbrella disc 31 is completely provided, that is, the anti-fouling flashover coating 314 is provided on the part from the second preset position of the i-th umbrella edge to the interface between the i-th umbrella edge and the i-th umbrella groove, the i+1-th umbrella groove, the i+1-th umbrella edge, ..., the N-1-th umbrella edge, the N-th umbrella groove, the interface between the N-th umbrella groove and the N-th umbrella edge to the interface between the N-th umbrella edge and the convex surface of the umbrella disc 31, and the concave surface of the umbrella disc 31; wherein i is a positive integer, and i is greater than or equal to 2 and less than or equal to N. In this embodiment, i is taken as 2 for illustration, that is, the second preset position can be the same preset position as the first preset position, that is, all CD segments are provided with anti-fouling flash coating 314. Of course, it can also be other numbers, and there is no limitation on it in this embodiment. Among them, the first preset position C can be one of the positions on the first preset section, the first preset section is from the first starting point to the point on the bottom wall of the second umbrella rib that is farthest from the first starting point, and the first starting point is the interface between the second umbrella groove and the second umbrella rib; preferably, the first preset position C can be the middle position of the bottom wall of the second umbrella rib 3112, of course, it can also be other positions, such as a position on the bottom wall of the second umbrella rib 3112 at 1 / 3~2 / 3 of the axis of the umbrella disk along the radial direction, and there is no limitation on it in this embodiment; the second preset position can be one of the positions on the second preset section, the second preset section is from the second starting point to the point on the bottom wall of the i-th umbrella rib that is farthest from the second starting point, and the second starting point is the interface between the i-th umbrella groove and the i-th umbrella rib; preferably, the second preset position is the middle position of the bottom wall of the i-th umbrella rib, of course, it can also be a position on the bottom wall of the i-th umbrella rib at other positions at 1 / 3~2 / 3 of the axis of the umbrella disk along the radial direction, and there is no limitation on it in this embodiment.

[0026] In the above embodiment, the extension length from the first umbrella edge 3111 to the N-1th umbrella edge gradually increases, that is, from the inner first umbrella edge 3111 to the outer N-1th umbrella edge, the extension length of each umbrella edge 311 gradually increases.

[0027] In this embodiment, the anti-pollution flashover coating 314 may be an RTV (room temperature vulcanized silicone rubber) coating, and may also be other anti-pollution flashover coatings, which are not limited in this embodiment.

[0028] In summary, the coated disc insulator provided in the present embodiment restricts the coating position of the anti-pollution flashover coating on the insulator, that is, the outer wall of each rib 311 on the exposed section BC and the concave surface of the disc 31 are exposed, that is, the anti-pollution flashover coating is not coated, while the anti-pollution flashover coating 314 is provided on the concave surface of the disc 31 from the first preset position C of the second rib 3112 to the interface between the Nth rib and the convex surface of the disc 31, and at least part of the convex surface of the disc 31. The anti-pollution flashover coating 314 improves the external insulation anti-pollution performance of the disc insulator not coated with RTV, and does not reduce the steep wave breakdown resistance performance of the disc insulator not coated with the anti-pollution flashover coating 314. That is to say, the disc insulator provided with the coating can improve the external insulation anti-pollution performance through the anti-pollution flashover coating 314, and can pass the steep wave impact breakdown test to avoid the breakdown of the disc insulator, thereby improving the qualified rate and service life of the disc insulator.

[0029] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A disc-shaped insulator with a coating, characterized in that: include: An iron cap, a steel foot and an insulating member arranged and connected therebetween; wherein, The insulating member is connected to the steel foot by cement adhesive, and the exposed portion of the insulating member is an umbrella plate; N umbrella edges are extended on the concave surface of the umbrella disc, and each of the umbrella edges is arranged around the entire circumference of the axis of the umbrella disc and is sequentially sleeved along the radial direction of the umbrella disc; N is a positive integer and is greater than or equal to 3; each of the umbrella edges is an annular structure; Along the radial direction of the umbrella disc from the axis of the umbrella disc to the outer periphery thereof, the umbrella edges are sequentially recorded as the first umbrella edge, the second umbrella edge to the Nth umbrella edge; An exposed section is provided on the concave surface of the umbrella plate, and the exposed section extends from the interface between the cement adhesive and the concave surface of the umbrella plate to the outer periphery of the umbrella plate to a first preset position of the second umbrella edge, and the outer walls of each umbrella edge and the concave surface of the umbrella plate on the exposed section are exposed; An anti-fouling flashover coating is provided on the concave surface of the umbrella plate from the first preset position of the second umbrella edge to the interface between the Nth umbrella edge and the convex surface of the umbrella plate, and at least partially on the convex surface of the umbrella plate; An anti-fouling flashover coating is provided on the concave surface of the umbrella plate from the second preset position of the i-th umbrella edge to the interface between the N-th umbrella edge and the convex surface of the umbrella plate, and on the convex surface of the umbrella plate; wherein i is a positive integer, and i is greater than or equal to 2 and less than or equal to N; The first preset position is one of the positions on the first preset section, the first preset section is from the first starting point to the point on the bottom wall of the second umbrella edge that is farthest from the first starting point, and the first starting point is the interface between the second umbrella groove and the second umbrella edge; The second preset position is one of the positions on the second preset section, the second preset section is from the second starting point to the point on the bottom wall of the i-th umbrella edge that is farthest from the second starting point, and the second starting point is the interface between the i-th umbrella groove and the i-th umbrella edge.

2. The coated disc insulator according to claim 1, characterized in that: The concave surface of the umbrella plate is provided with a hole at the inner periphery of the first umbrella edge, and the hole is spaced apart from the first umbrella edge.

3. The coated disc insulator according to claim 2, characterized in that: Any two adjacent umbrella edges are spaced at a preset distance so that an umbrella groove is provided between any two adjacent umbrella edges; and / or an umbrella groove is provided between the first umbrella edge and the hole.

4. The coated disc insulator according to claim 3, characterized in that: The umbrella groove is an annular structure.

5. The coated disc insulator according to claim 1, characterized in that: From the first umbrella edge to the N-1th umbrella edge, the extension length gradually increases.

6. The coated disc insulator according to claim 1, characterized in that: The anti-fouling flashover coating is an RTV coating.

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