Drop-out fuse with sun exposure resistant coating

Abstract

The invention relates to a drop-out fuse with a sun exposure resistant coating. And a coating with low absorptivity is uniformly sprayed on the surface of the drop-out fuse. The coating of the coating comprises the following components in percentage by weight: 35% of polymer silicon resin powder, 19% of titanium dioxide, 24% of barium sulfate powder, 20% of xylene, 0.6% of flatting agent, 0.4% of defoaming agent and 1% of UV absorbent. The coating is uniformly sprayed on parts which do not influence the action and electric conduction of the fuse tube, and the sprayed area comprises an upper iron handle, an insulator, a fixed end, a lower iron handle, the fuse tube and a pull ring of the drop-out fuse. The surface of the coating has high brightness and can reflect most sunlight. The coating has good insulation characteristics and can be used in the electrical field. The coating has good weather resistance and chemical stability, and is suitable for being used in various harsh environments.

Description

Technical Field

[0001] The invention relates to high-voltage power transmission equipment, in particular to a drop-out fuse capable of withstanding the sun's scorching weather, and belongs to the technical field of power equipment. Background Art

[0002] As a key component on the high-voltage side of the power supply line of the power grid, the drop-out fuse has been widely used around the world. The drop-out fuse can realize the overcurrent protection and breaking function on the high-voltage side, and its reliability affects the safety of the power supply system. Porcelain insulators are its key components. The rupture of porcelain insulators occurs from time to time, which seriously affects the order of power production. The failure of the drop-out fuse is mainly caused by the breakage of porcelain insulators. Porcelain insulators are subject to gravity, wind load and the impact of manual closing. In addition, the thermal stress of the insulator caused by the change of ambient temperature cannot be ignored. In summer, high temperature weather occurs in many places in my country, especially in Xinjiang, Gansu, Xi'an and other places where the surface temperature exceeds 70℃. Objects on the ground and near the ground have a higher temperature due to the absorption of sunlight radiation, while the air around the surface is lower than the ground temperature. Therefore, attempts to reduce the absorption rate of sunlight by the drop-out fuse can reduce its temperature and thus reduce the thermal stress on the insulator.

[0003] Drop-out fuses are usually installed on poles, high above the ground. If they can effectively reflect the energy from the sun to the surface of the insulator, the temperature rise of the insulator can be reduced, thereby reducing the stress caused by its thermal expansion. Currently, research on porcelain insulators is all about trying to enhance the strength of the insulator or using composite materials, but has not fully considered the method of reflecting the energy radiated by the sun to the insulator to reduce thermal stress.

[0004] At present, in order to improve the reliability of drop-out fuses, polymer materials are often used to manufacture insulators. This type of insulator is mainly composed of a resin round rod and a rubber umbrella skirt on it. However, in the northwest region of China, due to strong ultraviolet rays and serious aging of rubber, porcelain insulators are often used outdoors in the northwest region of my country. For drop-out fuses used outdoors, there is a technology that prevents the drop-out fuse from being exposed to the environment by placing the drop-out fuse in a protective cover and equipping it with a ventilation and heat dissipation device, thereby improving the reliability of the drop-out fuse. There is also a technology that provides a moisture-proof coating on the fuse tube, which can make the fuse tube moisture-proof and heat-insulating, and avoid the problem that the fuse tube cannot fall off due to moisture deformation. However, the above technologies all have limitations and cannot solve the problem of rupture caused by thermal stress of the drop-out fuse under sun exposure. Summary of the invention

[0005] The purpose of the present invention is to provide a drop-out fuse with a coating that can resist sun exposure. A low-absorption coating is evenly sprayed on the surface of the drop-out fuse, and the sprayed area includes the upper iron handle, insulator, fixed end, lower iron handle, fuse tube, and pull ring of the drop-out fuse to ensure the original performance of the drop-out fuse.

[0006] The coating used is made by mixing ultra-white barium sulfate powder and polymer resin in a certain proportion. The coating contains 35% polymer silicone resin powder, 19% titanium dioxide, 24% ultra-white barium sulfate powder, 20% xylene, 0.6% leveling agent, 0.4% defoaming agent, and 1% UV absorber in proportion by weight.

[0007] The preparation method of the coating comprises the following steps: in a stirrer, mixing polymer silicone resin powder with xylene, adding titanium dioxide and ultra-white barium sulfate powder and fully dispersing them to ensure that the materials are uniform, then adding a leveling agent, a defoaming agent, and a UV absorber, fully mixing, filtering the coating to remove insoluble particles.

[0008] The spraying method of the low-absorption coating comprises the following steps: surface cleaning, adding an appropriate amount of solvent to adjust the coating viscosity, using air spraying equipment, spraying in layers to ensure that each layer is thin and uniform, and the coating is naturally dried and cured.

[0009] Preferably, the ultra-white barium sulfate powder is a 1250 mesh powder prepared by a chemical precipitation method.

[0010] Preferably, the UV absorber is ultraviolet absorber UV-326.

[0011] The beneficial effects of the present invention are as follows: the coating can reflect more than 97% of sunlight, thereby significantly reducing the temperature rise of the insulator caused by solar radiation and reducing the thermal stress of the insulator. The coating is prepared by mixing ultra-white barium sulfate powder and polymer resin in a certain proportion. The coating has a low solar absorption rate because ultra-white barium sulfate can strongly reflect visible light and infrared light, thereby significantly reducing the absorption rate of sunlight, and is very suitable for occasions where heat absorption needs to be reduced. At the same time, the surface of the coating has high brightness and can reflect most of the sunlight. The coating also has good insulation properties and can be used in the electrical field. The coating has good weather resistance and chemical stability and is suitable for use in various harsh environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The coating preparation process of drop-out fuse is shown in the figure; Figure 2 The coating range of the drop-out fuse is shown in FIG. DETAILED DESCRIPTION

[0013] The embodiment of the present invention relates to a drop-out fuse that can withstand the sun's scorching weather. By coating the surface of the inactive parts of the drop-out fuse with a low-absorption coating, the energy of sunlight irradiating the surface of the insulator is reflected, thereby effectively reducing the temperature rise of the insulator, reducing its thermal stress, and improving its working reliability. The invention includes a drop-out fuse with a low-absorption coating and a method for preparing the coating. The following are specific implementation details: A low-absorption coating comprises the following raw materials in weight proportion: 35% of polymer silicone resin powder, 19% of titanium dioxide, 24% of ultra-white barium sulfate powder, 20% of xylene, 0.6% of leveling agent, 0.4% of defoaming agent and 1% of UV absorber.

[0014] The method for preparing the low-absorption coating comprises the following steps: In a blender, mix the polymer silicone powder with xylene, add titanium dioxide and 1250 mesh ultra-white barium sulfate powder and fully disperse them to ensure uniform material.

[0015] Add leveling agent, defoamer, UV absorber, etc. and mix thoroughly.

[0016] Filter the paint to remove insoluble particles.

[0017] Add a small amount of solvent as needed to change the fluidity of the paint and adjust it to a suitable viscosity for easy construction.

[0018] The spraying process of the drop-out fuse coating capable of withstanding the sun's scorching weather comprises the following steps: Surface cleaning: ensure that the surface of the drop-out fuse insulator is clean and free of oil, dust and other impurities.

[0019] Paint preparation: Use a mechanical stirrer to fully stir the paint to ensure uniform distribution of barium sulfate and other ingredients. According to the requirements of spraying, add an appropriate amount of solvent to adjust the viscosity.

[0020] For coating method, use air spray equipment. The spray gun caliber and pressure should be adjusted according to the viscosity and expected thickness of the coating. Spray in layers to ensure that each layer is thin and even.

[0021] The coating range is to spray the coating on the parts that do not affect the action and conduction of the fuse tube, including the upper iron handle 1, insulator 2, fixed end 3, lower iron handle 4, fuse tube 7, pull ring 8. The outlet terminal 5, fuse 6, contact 9, and inlet terminal 10 are not sprayed.

[0022] To cure, allow the coating to dry and cure naturally in a warm, well-ventilated environment.

[0023] Post-treatment: After the coating is cured, check whether there are defects on the coating surface and polish and re-coat if necessary.

[0024] The performance verification of the surface coating of the drop-out fuse includes the following: Compare the maximum temperatures of coated and uncoated insulators under sunlight to verify the effect of coating on reducing sunlight exposure of insulators; Compare the effects of different coating thicknesses on the temperature field of the insulator and determine the optimal coating thickness.

Claims

1. A drop-out fuse with a coating that resists sun exposure, characterized in that: A low-absorption coating is evenly sprayed on the surface of the drop-out type fuse, and the coating reflects more than 97% of sunlight. The sprayed area includes the upper iron handle (1), the insulator (2), the fixed end (3), the lower iron handle (4), the fuse tube (7), and the pull ring (8) of the drop-out type fuse.

2. A drop-out fuse with a coating that resists solar exposure according to claim 1, characterized in that: The coating used is: made by mixing ultra-white barium sulfate powder and polymer resin in a certain proportion, and the coating contains 35% polymer silicone resin powder, 19% titanium dioxide, 24% ultra-white barium sulfate powder, 20% xylene, 0.6% leveling agent, 0.4% defoaming agent, and 1% UV absorber in proportion by weight.

3. A drop-out fuse with a coating that resists solar exposure according to claim 1, characterized in that: The preparation method of the coating comprises the following steps: in a stirrer, mixing polymer silicone resin powder with xylene, adding titanium dioxide and ultra-white barium sulfate powder and fully dispersing them to ensure that the materials are uniform, then adding a leveling agent, a defoaming agent, and a UV absorber, fully mixing, filtering the coating to remove insoluble particles.

4. A drop-out fuse with a coating that resists solar exposure according to claim 1, characterized in that: The spraying method of the low-absorption coating comprises the following steps: surface cleaning, adding an appropriate amount of solvent to adjust the coating viscosity, using air spraying equipment, spraying in layers to ensure that each layer is thin and uniform, and the coating is naturally dried and cured.

5. The drop-out fuse with a coating for resisting solar exposure according to claim 2, characterized in that: Ultra-white barium sulfate powder is a 1250 mesh powder made by chemical precipitation.

6. A drop-out fuse with a coating that resists solar exposure according to claim 2, characterized in that: The UV absorber used is ultraviolet absorber UV-326.

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