Disc type suspension porcelain insulator and preparation method thereof

Abstract

The preparation method comprises the following steps: S1, preparing a cement adhesive from 1 part by weight of cement, 0.5-1.0 part by weight of sand, 0.2 part by weight of water, 0.02-0.03 part by weight of silica fume and 0.01-0.02 part by weight of a water reducing agent; and S2, injecting the cement adhesive into the steel foot assembly cavity of the insulator porcelain part, and cementing the steel foot in the steel foot assembly cavity of the insulator porcelain part by the formed cement adhesive. Further, before the step S2, a layer of wet sand grains is smeared on the inner surface, close to the outer side area, of the steel foot assembly cavity of the insulator porcelain piece; in the step S2, the formed cement adhesive is combined with the insulator porcelain piece through a sand coating layer in the area, close to the outer side, of the steel foot assembly cavity. According to the invention, the accuracy of detecting the internal defect of the insulator by the insulation resistance detection method can be greatly improved, and the omission ratio is greatly reduced.

Description

Technical Field

[0001] The invention relates to the field of power transmission line electrical equipment, and in particular to a disc-type suspension porcelain insulator and a preparation method thereof. Background Art

[0002] Insulators are important equipment components of power transmission and transformation systems. They are widely used in power grid systems such as high-voltage transmission lines and substations, and play a role in mechanical support and power insulation for transmission lines. Among all types of insulators, porcelain insulators are the most widely used type of insulators. Their advantages are that porcelain has good chemical stability, and porcelain materials basically do not age. At the same time, they have good mechanical properties and are relatively simple to match with electrical systems. In addition, porcelain insulators are cost-effective and are the most mature and experienced products in terms of installation and maintenance technology.

[0003] For porcelain insulators, many reasons can lead to the formation of through cracks inside the insulator, resulting in a decrease in mechanical properties and loss of insulation capacity. This situation is called porcelain insulator degradation. Porcelain insulators may deteriorate during production, transportation, installation, and operation. During production, insulators have micro-pores, micro-cracks, gaps caused by inconsistent shrinkage coefficients between connectors and porcelain materials; during transportation and installation, porcelain head defects are also caused by collisions and other reasons; after being put into operation, the pores and cracks inside the porcelain expand over a long period of operation to form through channels.

[0004] The most commonly used detection method for deteriorated porcelain insulators in transmission lines at home and abroad is to measure the insulation resistance, which is convenient, fast and safe. my country's power standard "DLT626-2005 Deteriorated Disc Suspension Insulator Detection Procedure" stipulates that the insulation resistance of porcelain insulators should be measured, and those with an insulation resistance below 500MΩ are judged as deteriorated insulators. In actual operating experience, the insulation resistance value obtained by directly measuring a porcelain insulator with internal cracks with an insulation resistance meter will still be higher than 500MΩ, indicating that this detection method cannot accurately judge.

[0005] It should be noted that the information disclosed in the above background technology section is only used for understanding the background of the present application, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Summary of the invention

[0006] The main purpose of the present invention is to solve the problems existing in the above-mentioned background technology and to provide a disc-type suspension porcelain insulator and a preparation method thereof.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A method for preparing a disc-type suspension porcelain insulator comprises the following steps:

[0009] S1. Prepare cement adhesive according to the weight ratio of 1 part of cement, 0.5-1.0 part of sand, 0.2 part of water, 0.02-0.03 part of microsilica powder and 0.01-0.02 part of water reducer;

[0010] S2, injecting the cement adhesive into the steel foot assembly cavity of the insulator porcelain component, and the formed cement adhesive is used to glue the steel foot into the steel foot assembly cavity of the insulator porcelain component.

[0011] Further:

[0012] Before step S2, a layer of wet sand is applied to the inner surface of the outer area of ​​the steel foot assembly cavity of the insulator porcelain component; in step S2, the formed cement adhesive is combined with the insulator porcelain component through the sand coating layer in the outer area of ​​the steel foot assembly cavity.

[0013] The wet sand particles are applied to the inner circumferential surface of the steel leg assembly cavity of the insulator porcelain component in the outer region.

[0014] The wet sand particles are prepared by mixing sand and water in a weight ratio of 5:2.

[0015] The diameter of the sand particles is 0.4-0.6 mm.

[0016] The diameter of the sand particles is 0.5 mm.

[0017] The thickness of the sand coating layer is 0.5-1 mm, and the width is 1.5-2 cm.

[0018] The sand particles are porcelain sand.

[0019] The cone head type disk-type suspension porcelain insulator.

[0020] A disc-type suspension porcelain insulator is prepared by the preparation method of the disc-type suspension porcelain insulator, wherein the steel foot assembly cavity of the insulator porcelain part is fixed with the cement adhesive, and the top of the insulator porcelain part is equipped with an iron cap.

[0021] The present invention has the following beneficial effects:

[0022] The present invention proposes a method for manufacturing a disc-type suspended porcelain insulator, which improves the cement adhesive used for gluing steel feet. Compared with conventional cement adhesives, the ratio of sand and cement components is increased, which increases the water permeability of cement after molding, making it easy for water vapor in the environment to penetrate. For insulators with internal defects, water vapor is more likely to reach the fracture surface inside the porcelain part, causing the insulation resistance between the insulator iron cap and the steel foot to drop significantly, so that the insulation resistance detection method can accurately detect internal defects and greatly reduce the missed detection rate. Furthermore, the present invention also applies a sand layer on the surface of the outer area of ​​the steel foot assembly cavity before gluing cement on the porcelain part, and establishes a unique water vapor infiltration channel between the molded cement and the porcelain part. When there are cracks inside the insulator, water vapor in the environment can use the water vapor infiltration channel to penetrate into the internal cracks by thermal movement, so that the insulation resistance between the insulator iron cap and the steel foot is significantly reduced, thereby ensuring that the inspection personnel can determine the existence of internal defects through the insulation resistance detection method.

[0023] Other beneficial effects of the embodiments of the present invention will be further described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a schematic cross-sectional structure diagram of a disc-type suspension porcelain insulator according to an embodiment of the present invention.

[0025] Figure 2 It is a structural schematic diagram of a disc-type suspension porcelain insulator according to an embodiment of the present invention, in which a sand layer is first applied before cement is applied. DETAILED DESCRIPTION

[0026] The following is a detailed description of the embodiments of the present invention. It should be emphasized that the following description is only exemplary and is not intended to limit the scope and application of the present invention.

[0027] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, connection can be used for fixing as well as for coupling or communication.

[0028] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] See also Figure 1 and Figure 2 The embodiment of the present invention provides a method for preparing a disc-type suspension porcelain insulator, comprising the following steps:

[0031] S1. Prepare cement adhesive 1 according to the weight ratio of 1 part of cement, 0.5-1.0 part of sand, 0.2 part of water, 0.02-0.03 part of microsilica powder and 0.01-0.02 part of water reducing agent;

[0032] S2, injecting the cement adhesive 1 into the steel foot assembly cavity 6 of the insulator porcelain component 2, and the formed cement adhesive 1 glues the steel foot 3 into the steel foot assembly cavity 6 of the insulator porcelain component 2.

[0033] like Figure 1 and Figure 2 As shown, in a preferred embodiment, before step S2, a layer of wet sand is applied to the inner surface of the steel leg assembly cavity 6 of the insulator porcelain part 2 in the outer area, preferably, applied in a circle along the inner circumferential surface of the cavity to form a sand coating layer 4; in step S2, the formed cement adhesive 1 is combined with the insulator porcelain part 2 in the outer area of ​​the steel leg assembly cavity 6 through the sand coating layer 4.

[0034] The disc-type suspension porcelain insulator prepared by the present invention can greatly improve the accuracy of detecting internal defects of the insulator by the insulation resistance detection method, and greatly reduce the missed detection rate.

[0035] In order to ensure that the insulators can be detected using the insulation resistance measurement method, the preferred embodiment of the present invention improves the ability of water vapor to penetrate the through-going cracks inside the porcelain parts from two aspects: improving the water permeability of the insulator cement adhesive and improving the connection between the steel foot cement and the porcelain parts. When such insulators with internal cracks are measured by the insulation resistance detection method, the insulation resistance obtained can be significantly lower than the threshold value of 500MΩ specified by the standard.

[0036] In a preferred embodiment, the wet sand particles are prepared by mixing sand and water in a weight ratio of 5:2. The diameter of the sand particles is 0.4-0.6 mm, preferably 0.5 mm. Figure 2 As shown, the thickness of the sand coating layer 4 is 0.5-1 mm, and the width is 1.5-2 cm. The sand particles are preferably porcelain sand.

[0037] like Figure 1 and Figure 2 As shown, preferably, the disc-type suspension porcelain insulator is a disc-type suspension porcelain insulator with a conical head.

[0038] See also Figure 1 A disc-type suspension porcelain insulator is prepared by the preparation method of a disc-type suspension porcelain insulator of any of the aforementioned embodiments, wherein the steel foot assembly cavity 6 of the insulator porcelain part 2 is fixed with the steel foot 3 by the cement adhesive 1, and the top of the insulator porcelain part 2 is also equipped with an iron cap 5.

[0039] The disc-type suspension porcelain insulator prepared by the embodiment of the present invention has a design in which the ratio of sand and cement in the cement adhesive between the steel leg and the porcelain part is increased, so that the permeability of environmental water vapor at the cement adhesive position is better. Furthermore, before the cement is glued to the steel leg assembly cavity of the insulator porcelain part, a layer of moist sand is first applied to the inner surface of the cavity in the outer area of ​​the steel leg assembly cavity of the insulator porcelain part. The formed cement adhesive is combined with the insulator porcelain part through the sand coating layer in the outer area of ​​the steel leg assembly cavity. The introduction of the sand coating layer provides a sand layer penetration channel for water vapor. The above two measures can jointly improve the permeability of environmental water vapor. When a through crack appears inside the insulator porcelain part, due to the better permeability of environmental water vapor, the insulation resistance between the iron cap and the steel leg will drop significantly, and the internal micro-crack defects can be accurately detected.

[0040] The specific embodiments of the present invention are further described below.

[0041] A method for preparing a disc-type suspension porcelain insulator, comprising:

[0042] (1) The composition and weight ratio of the cement adhesive are as follows: 1 part of cement, 0.5-1.0 part of sand, 0.2 part of water, 0.02-0.03 part of microsilica powder and 0.01-0.02 part of water reducing agent. Compared with conventional cement adhesive for porcelain insulators, the cement adhesive of the present invention increases the proportion of sand and cement and reduces the proportion of microsilica powder. The preparation process can be consistent with that of general cement adhesive for porcelain insulators.

[0043] (2) Before injecting cement adhesive into the steel foot assembly cavity 6 of the inverted insulator porcelain part 2, a layer of wet porcelain sand is applied to the inner surface of the outer circumference of the steel foot assembly cavity 6 to form a sand coating layer 4. The diameter of the sand particles is about 0.5 mm, and the sand particles are wetted by mixing sand and water in a ratio of 5:2. The thickness of the applied sand coating layer 4 is 0.5 to 1 mm, and the application width is 1.5 to 2 cm. Figure 1 After sand coating, cement adhesive 1 is injected to form the adhesive.

[0044] Since the ratio of sand to cement in the cement adhesive and the addition of a sand coating layer in the present invention can reduce the shear stress of the steel foot cement adhesive on the insulator porcelain parts, the present invention is particularly suitable for cone-head type disc-type suspension porcelain insulators.

[0045] The porcelain insulator obtained by the method for preparing a disc-type suspended porcelain insulator according to an embodiment of the present invention significantly improves the accuracy of detecting cracks inside the porcelain insulator. Compared with the traditional method for preparing porcelain insulators, the present invention increases the proportion of sand and cement in the proportion of cement adhesive, and reduces the proportion of microsilica powder. Such an adjustment effectively improves the water permeability of the cement adhesive. Furthermore, the present invention applies a layer of moist sand particles to the outer area of ​​the steel foot assembly cavity of the insulator porcelain part, providing a penetration channel for water vapor. In a preferred embodiment, these two measures work together to make it easier for environmental water vapor to penetrate into the interior of the porcelain part, especially when there are cracks inside the porcelain part, water vapor can easily penetrate into the cracks by thermal movement, resulting in a significant decrease in the insulation resistance between the iron cap and the steel foot, thereby detecting the presence of microcracks.

[0046] The preparation method of the embodiment of the present invention greatly improves the reliability and safety of micro-crack detection of porcelain insulators. Through the improved cement adhesive and wet sand coating process, when there are cracks inside the porcelain parts, it can ensure that the insulation resistance drops significantly to below the standard threshold of 500MΩ, so that the internal degradation can be 100% detected by the insulation resistance detection method. This method not only improves the accuracy of detection, but also reduces the risk of transmission line failure caused by porcelain degradation. In addition, through the preparation method of the present invention, porcelain insulators with cracks can be discovered and replaced earlier, thereby improving the stability and safety of the entire power system.

[0047] The above content is a further detailed description of the present invention in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, without departing from the concept of the present invention, it can also make several substitutions or modifications to these described embodiments, and these substitutions or modifications should be regarded as belonging to the protection scope of the present invention. In the description of this specification, the description of the reference terms "an embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily target the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In the absence of mutual contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and modifications can be made herein without departing from the scope of protection of the patent application.

Claims

1. A method for preparing a disc-type suspension porcelain insulator, characterized in that: The steps include: S1. Prepare cement adhesive according to the weight ratio of 1 part of cement, 0.5-1.0 part of sand, 0.2 part of water, 0.02-0.03 part of microsilica powder and 0.01-0.02 part of water reducer; S2, injecting the cement adhesive into the steel foot assembly cavity of the insulator porcelain component, and the formed cement adhesive is used to glue the steel foot into the steel foot assembly cavity of the insulator porcelain component.

2. The method for preparing a disc-type suspension porcelain insulator according to claim 1, characterized in that: Also includes: Before step S2, a layer of wet sand is applied to the inner surface of the outer area of ​​the steel leg assembly cavity of the insulator porcelain component; In step S2, the formed cement adhesive is combined with the insulator porcelain component through a sand coating layer in the outer area of ​​the steel leg assembly cavity.

3. The method for preparing a disc-type suspension porcelain insulator according to claim 1, characterized in that: The wet sand particles are applied to the inner circumferential surface of the steel leg assembly cavity of the insulator porcelain component in the outer region.

4. The method for preparing a disc-type suspension porcelain insulator according to claim 2 or 3, characterized in that: The wet sand particles are prepared by mixing sand and water in a weight ratio of 5:

2.

5. The method for preparing a disc-type suspension porcelain insulator according to claim 2 or 3, characterized in that: The diameter of the sand particles is 0.4-0.6 mm.

6. The method for preparing a disc-type suspension porcelain insulator according to claim 5, characterized in that: The diameter of the sand particles is 0.5 mm.

7. The method for preparing a disc-type suspension porcelain insulator according to claim 4, characterized in that: The thickness of the sand coating layer is 0.5-1 mm, and the width is 1.5-2 cm.

8. The method for preparing a disc-type suspension porcelain insulator according to claim 2 or 3, characterized in that: The sand particles are porcelain sand.

9. The method for preparing a disc-type suspension porcelain insulator according to any one of claims 1 to 8, characterized in that: The cone head type disk-type suspension porcelain insulator.

10. A disc-type suspension porcelain insulator, characterized in that: The insulator is prepared by the method for preparing a disc-type suspension porcelain insulator according to any one of claims 1 to 9, wherein the steel foot assembly cavity of the insulator porcelain part is fixed with the steel foot by the cement adhesive, and the top of the insulator porcelain part is equipped with an iron cap.

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