Preparation method of surface conductivity gradient coating for direct current GIL epoxy resin insulator

Abstract

The invention discloses a preparation method of a surface conductivity gradient coating for a direct-current GIL epoxy resin insulator, and the method comprises the following steps: dividing the surface of the insulator into N parts from a high-voltage electrode to a ground electrode, and then sequentially coating high-conductivity coatings on the surface of the insulator from the high-voltage electrode to the ground electrode according to the conductivity from high to low, and through curing, forming the gradient distribution insulator with gradually reduced conductivity. The bonding between the surface coating and the epoxy resin insulator is firmer. A normal-temperature liquid epoxy resin material which is the same as an insulator substrate material is adopted as a matrix of the coating, so that the adhesion between the coating and an epoxy resin insulator can be ensured; the method can be used for regulating and controlling the surface charge distribution of the GIL epoxy resin insulator under the direct-current voltage, optimizing the surface electric field distribution and improving the surface electric strength. The coating provided by the invention is simple and feasible in preparation scheme, relatively low in cost and wide in application prospect.

Description

technical field

[0001] This patent application relates to the technical field of design and manufacture of high-voltage power equipment, in particular to a method for preparing a surface conductance gradient coating for DC GIL epoxy resin insulators. Background technique

[0002] Gas-insulated metal-enclosed transmission line (Gas Insulated metal-enclosed transmission Line, GIL) has the advantages of large transmission capacity, low loss, small footprint, and environmental friendliness, and is widely used in power systems. Under the action of long-term DC voltage, the large amount of charge accumulated by the insulator is an important reason for the surface flashover of the pot insulator. The method of electric strength is very important to ensure the safe and stable operation of DC GIL.

[0003] Surface modification is a method that does not change the bulk properties of the insulating material, so the mechanical properties of the material itself are not affected. The sol...

Examples

preparation example Construction

[0037] A method for preparing a surface conductance gradient coating for DC GIL epoxy resin insulators, the method comprising the following steps: first divide the surface of the insulator into N parts from the high-voltage electrode to the ground electrode, and then divide the high-conductivity coating into N parts according to the conductivity from high to high It is coated on the surface of the insulator from the high-voltage electrode to the ground electrode in turn, and after curing, an insulator with a gradient distribution of gradually decreasing electrical conductivity is formed.

[0038] Wherein, the preparation method of high conductivity coating comprises the following steps:

[0039] S11. Preheat the epoxy resin, high conductivity filler, and curing agent at 80-90°C for 2-3 hours;

[0040] S12. Mix epoxy resin and high conductivity filler, heat and stir in an oil bath at 60-80°C for 25-35 minutes, keep the temperature, then add diluent, and continue stirring for 10...

Embodiment 1

[0055] A high conductivity coating is composed of the following raw materials according to mass percentage: E44 type epoxy resin 45%, TiO 2 5%, 650 polyamide ester 35%, acetone 10%, fumed silica 5%.

[0056] The preparation method of high conductivity paint comprises the steps:

[0057] S11, the E44 type epoxy resin, TiO 2 , 650 polyamide ester preheated at 80 ℃ for 2 hours;

[0058] S12, the E44 type epoxy resin and TiO 2 Mix, heat and stir in an oil bath at 60°C for 30 minutes, keep the temperature, then add acetone and continue stirring for 10 minutes to obtain mixture A;

[0059] S13. Add 650 polyamide ester and fumed silica to the mixture A prepared in step S12, and stir at room temperature for 10 minutes to obtain mixture B;

[0060] S14. Degas the mixture B prepared in step S13 in a vacuum environment at a temperature of 60° C. for 30 minutes to obtain a high-conductivity coating.

Embodiment 2

[0062] A high conductivity coating is composed of the following raw materials according to mass percentage: E44 type epoxy resin 42%, TiO 2 10%, 650 polyamide ester 33%, acetone 10%, fumed silica 5%.

[0063] The preparation method of high conductivity paint comprises the steps:

[0064] S11, the E44 type epoxy resin, TiO 2 , 650 polyamide ester preheated at 80 ℃ for 2 hours;

[0065] S12, the E44 type epoxy resin and TiO 2 Mix, heat and stir in an oil bath at 60°C for 30 minutes, keep the temperature, then add acetone and continue stirring for 10 minutes to obtain mixture A;

[0066] S13. Add 650 polyamide ester and fumed silica to the mixture A prepared in step S12, and stir at room temperature for 10 minutes to obtain mixture B;

[0067] S14. Degas the mixture B prepared in step S13 in a vacuum environment at a temperature of 60° C. for 30 minutes to obtain a high-conductivity coating.

technical field

[0001] This patent application relates to the technical field of design and manufacture of high-voltage power equipment, in particular to a method for preparing a surface conductance gradient coating for DC GIL epoxy resin insulators. Background technique

[0002] Gas-insulated metal-enclosed transmission line (Gas Insulated metal-enclosed transmission Line, GIL) has the advantages of large transmission capacity, low loss, small footprint, and environmental friendliness, and is widely used in power systems. Under the action of long-term DC voltage, the large amount of charge accumulated by the insulator is an important reason for the surface flashover of the pot insulator. The method of electric strength is very important to ensure the safe and stable operation of DC GIL.

[0003] Surface modification is a method that does not change the bulk properties of the insulating material, so the mechanical properties of the material itself are not affected. The sol...

Examples

preparation example Construction

[0037] A method for preparing a surface conductance gradient coating for DC GIL epoxy resin insulators, the method comprising the following steps: first divide the surface of the insulator into N parts from the high-voltage electrode to the ground electrode, and then divide the high-conductivity coating into N parts according to the conductivity from high to high It is coated on the surface of the insulator from the high-voltage electrode to the ground electrode in turn, and after curing, an insulator with a gradient distribution of gradually decreasing electrical conductivity is formed.

[0038] Wherein, the preparation method of high conductivity coating comprises the following steps:

[0039] S11. Preheat the epoxy resin, high conductivity filler, and curing agent at 80-90°C for 2-3 hours;

[0040] S12. Mix epoxy resin and high conductivity filler, heat and stir in an oil bath at 60-80°C for 25-35 minutes, keep the temperature, then add diluent, and continue stirring for 10...

Embodiment 1

[0055] A high conductivity coating is composed of the following raw materials according to mass percentage: E44 type epoxy resin 45%, TiO 2 5%, 650 polyamide ester 35%, acetone 10%, fumed silica 5%.

[0056] The preparation method of high conductivity paint comprises the steps:

[0057] S11, the E44 type epoxy resin, TiO 2 , 650 polyamide ester preheated at 80 ℃ for 2 hours;

[0058] S12, the E44 type epoxy resin and TiO 2 Mix, heat and stir in an oil bath at 60°C for 30 minutes, keep the temperature, then add acetone and continue stirring for 10 minutes to obtain mixture A;

[0059] S13. Add 650 polyamide ester and fumed silica to the mixture A prepared in step S12, and stir at room temperature for 10 minutes to obtain mixture B;

[0060] S14. Degas the mixture B prepared in step S13 in a vacuum environment at a temperature of 60° C. for 30 minutes to obtain a high-conductivity coating.

Embodiment 2

[0062] A high conductivity coating is composed of the following raw materials according to mass percentage: E44 type epoxy resin 42%, TiO 2 10%, 650 polyamide ester 33%, acetone 10%, fumed silica 5%.

[0063] The preparation method of high conductivity paint comprises the steps:

[0064] S11, the E44 type epoxy resin, TiO 2 , 650 polyamide ester preheated at 80 ℃ for 2 hours;

[0065] S12, the E44 type epoxy resin and TiO 2 Mix, heat and stir in an oil bath at 60°C for 30 minutes, keep the temperature, then add acetone and continue stirring for 10 minutes to obtain mixture A;

[0066] S13. Add 650 polyamide ester and fumed silica to the mixture A prepared in step S12, and stir at room temperature for 10 minutes to obtain mixture B;

[0067] S14. Degas the mixture B prepared in step S13 in a vacuum environment at a temperature of 60° C. for 30 minutes to obtain a high-conductivity coating.

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