Method for installing inner insulation partition plate of hollow post composite insulator

Abstract

The inner insulation partition plate of the present application is composed of a sealing plate 1 and a supporting plate 2, which can be combined and installed flexibly according to product requirements, can be close together or at a certain distance, one sealing plate 1 can be matched with one or more supporting plates 2, or one or more sealing plates 1 can be matched with one supporting plate 2, and exhaust holes 4 are arranged at the set position of the insulation tube 3 with a silicon rubber umbrella skirt, and after the sealing partition plate 1 and the supporting plate 2 are installed and positioned, the holes 4 are plugged with hard solid insulation material and the same silicon rubber as the umbrella cover. The product of the present application is simple to manufacture, the installation process is novel and unique, the electrical performance and mechanical performance advantages of the two are maximized, and the product cost is reduced.

Description

Technical Field

[0001] This invention relates to the external insulation system for power substations and overhead transmission lines. Background Technology

[0002] Post composite insulators and crossarm composite insulators are collectively referred to as post-type composite insulators. Based on the core rod structure, they can be divided into solid core rods and hollow core rods. A patented product with a hollow core rod structure, the "Hollow Post Composite Insulator with Internal and External Reinforcement and No Filling Needed Inside the Tube" (Patent No.: zL201721202784.1), mimics the structure of bamboo. Several insulating partition plates are installed inside the hollow insulating tube to form a "bamboo joint" structure of sealed sections, dividing the hollow insulating tube into several independent, non-communicating spaces. This prevents the water film forming on the inner wall of the insulating tube during condensation, thus preventing it from spreading and causing surface discharge. Simultaneously, these "bamboo joint" insulating plates also prevent air breakdown that may occur between the upper and lower flanges under certain special conditions. To date, this structure remains the best solution for insulation within hollow core rods. However, the structural design of the sealing section of this product is not perfect, and installation is inconvenient. The details are as follows: 1. The sealing section is installed by pushing it one by one from the insulating tube port to the designated position. When a sealing section is pushed into the end of the insulating tube, it forms a sealed space with the previous sealing section (already installed and positioned). As this sealing section is pushed further into the insulating tube, the volume of this sealed space decreases, and the gas pressure increases. When the pressure increases to exceed the friction between the positioned sealing section and the insulating tube, it pushes the section out of place. Since a product needs to install several to a dozen sealing sections, and each sealing section needs to be positioned differently in the insulating tube according to voltage distribution and mechanical stress, any displacement will affect product quality. Moreover, this displacement is related to many factors, such as the friction between the sealing ring and the inner wall of the insulating tube, the distance between two adjacent sealing sections and the pressure of the sealed space formed, the retraction distance of the sealing section after the installer's thrust is removed, etc. These factors have different effects on each sealing section and are difficult to control. 2. To solve the sealing section displacement problem, vent holes are drilled on the sealing section during installation, and then the vent holes are plugged with adhesive after installation and positioning. This method can solve the sealing section displacement problem, but the hollow insulating tube has a small diameter and long length, making the plugging of the vent holes difficult to construct and difficult to guarantee quality. 3. The distributed voltage on the composite insulator of the support post exhibits a U-shaped curve. Near the high-voltage end of the product, the voltage is high while the bending load is low. Near the grounding end, the lower section of the product experiences low voltage but high bending load. Generally, the bending load at the high-voltage and low-voltage ends of a product differs by several to tens of times. The sealing joint design of this patented product is intended to simultaneously meet electrical and mechanical performance requirements. However, when the sealing joint is installed at the high-voltage end, its mechanical performance is idle, and when installed at the grounding end, its electrical performance is idle. This fails to fully utilize the material and results in waste. Summary of the Invention

[0003] To address the aforementioned product defects, this invention provides a method for installing internal insulation partition plates in hollow column composite insulators.

[0004] The internal insulation partition plate of this invention consists of a sealing plate 1 and a support plate 2. The function of the sealing plate 1 is to prevent surface discharge and air breakdown on the inner wall of the insulating tube 3, while the function of the support plate 2 is to prevent the insulating tube 3 from losing its roundness and cracking when subjected to bending loads. The sealing plate 1 and the support plate 2 can be conveniently and flexibly combined and installed according to product needs, giving full play to the electrical performance advantages of the sealing plate 1 and the mechanical performance advantages of the support plate 2. When installed, they can be installed close together or at a certain distance. One sealing plate 1 can be paired with one or more support plates 2, or one or more sealing plates 1 can be paired with one support plate 2. Alternatively, only the sealing plate 1 can be installed at the upper end of the column composite insulator where the bending load is very small.

[0005] Reference Figure 1 The installation method of the insulating partition board is as follows: 1. Drill vent holes 4 at the set positions on the insulating tube 3 with silicone rubber umbrella skirt. The diameters of the holes 4 are d and D respectively; 2. Push the sealing partition board 1 and the support plate 2 one by one from the end of the insulating tube 3 to the set installation positions; 3. Block the holes 4 with rigid solid insulating material and silicone rubber of the same type as the umbrella cover.

[0006] Reference Figure 2 The insulating sealing plate 1 is made of elastic insulating material with an internal skeleton 1-1. The skeleton 1-1 can be embedded in the mold and made as a whole with the sealing plate 1, or it can be made separately and then embedded into the sealing plate 1. The circumference of the sealing plate 1 in contact with the inner wall of the insulating tube is designed as an arc or a bevel 1-2. The small diameter h of the bevel is equal to or slightly smaller than the inner diameter of the insulating tube, and the large diameter of the bevel is more than 4 mm larger than the inner diameter of the insulating tube. The thickness of the sealing plate 1 is determined according to the product voltage rating, the diameter of the insulating tube, and the withstand voltage value designed for the sealing plate. Generally speaking, the thickness is proportional to the withstand voltage.

[0007] The support plate 2 is made of a rigid solid material and can be made into a circular plate or a ring shape. The thickness is determined according to the bending load of the product. The diameter of the support plate 2 slides in fit with the inner diameter of the insulating tube. Since it does not provide insulation, it does not need to be bonded to the insulating tube, and there are no requirements for the insulation performance of the material.

[0008] This layered modular insulating partition is simple to manufacture and has a novel and unique installation process. It can scientifically and rationally combine the insulating sealing plate 1 and the support plate 2 according to the different electrical and mechanical performance requirements of the upper and lower ends of the column-type composite insulator, so as to maximize the advantages of their respective electrical and mechanical performance and reduce the product cost. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the present invention.

[0010] Figure 2 This is a schematic diagram of a sealed and insulated partition plate. Detailed Implementation

[0011] Reference Figure 2 Insulating sealing plate 1 is made of silicone rubber and embedded in the skeleton.

[0012] Reference Figure 2 2. Use epoxy fiberglass board to make support plate.

[0013] Reference Figure 1 To install an insulating partition on the epoxy fiberglass tube 3 with a vulcanized silicone rubber umbrella skirt, a hole 4 needs to be drilled near it. First, a small drill bit with a diameter of d is used to drill through the hole, and then a drill bit with a diameter of D is used to enlarge the hole to a depth of half the thickness of the fiberglass tube wall.

[0014] Use the installer to push the insulating sealing plate 1 and the support plate 2 one by one from the end of the epoxy fiberglass tube 3 to the designated installation position.

[0015] After inserting an epoxy fiberglass rod with a diameter of D and a length equal to half the wall thickness of the fiberglass tube into hole 4, hole 4 is sealed with silicone rubber of the same type as the umbrella sleeve by vulcanizing it using a special mold.

[0016] The above-described specific embodiments are those selected in this example, but the materials and shapes for making the sealing plate 1 and the support plate 2 are not limited to those selected in this example. Any elastic insulating material can be used to make the sealing plate 1, and both insulating and non-insulating solid materials can be used to make the support plate 2.

Claims

1. A method for installing an inner insulation partition plate of a hollow post composite insulator, the hollow post composite insulator comprising an insulation tube (3) and an insulation partition plate installed in the insulation tube (3), the insulation tube (3) being an epoxy fiberglass tube with a vulcanized silicone rubber umbrella skirt, the insulation partition plate installed in the insulation tube (3) being composed of a sealing plate (1) and a supporting plate (2), the sealing plate (1) being lined with a framework (1-1) and having a slope (1-2) around the periphery, when installing the insulation partition plate, a hole (4) is punched near the location where the insulation partition plate is to be installed on the epoxy fiberglass tube with a vulcanized silicone rubber umbrella skirt, a small drill bit with a diameter of d is used to punch a hole, and then a drill bit with a diameter of D is used to expand the hole to a depth of half the thickness of the wall of the fiberglass tube; the insulation sealing plate (1) and the supporting plate (2) are pushed into the epoxy fiberglass tube (3) from the end of the epoxy fiberglass tube (3) one by one to a set installation position using an installer; after an epoxy fiberglass rod with a diameter of D and a length of half the thickness of the wall of the fiberglass tube is inserted into the hole (4), a special mold is used to vulcanize silicone rubber to seal the hole (4) with the same umbrella skirt.

2. The method of installing an inner insulator spacer plate of a hollow post composite insulator according to claim 1, characterized in that one sealing plate (1) is combined with one supporting plate, or is combined with multiple supporting plates (2).

3. The method of installing an inner insulator spacer plate of a hollow post composite insulator according to claim 1, characterized in that one supporting plate (2) is combined with one sealing plate (1), or is combined with multiple sealing plates (1).

4. The method of installing an inner insulator spacer plate of a hollow post composite insulator according to claim 1, characterized in that the framework (1-1) of the sealing plate and the supporting plate (2) are made of hard solid materials and are in the shape of a round plate or a round ring.

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