What are the anti fouling flash emergency plans, what are the anti fouling flash measures?

Filthy flashover includes ice floe flashover, which is the filthy substance with conductive properties accumulated on the surface of the insulator, which greatly reduces the insulation level of the insulator after being damp in wet weather, and constitutes a short circuit between the insulators, and the flashover accident occurs under normal operating conditions.

The dirty substances on the surface of insulators are generally divided into two categories:

1) Natural pollution: ice floes formed by rain and fog, fine dust floating in the air, salt spray (salt frost on the surface of the insulator) and bird droppings brought by the sea breeze.

2) Industrial pollution: Smoke and exhaust gases emitted from thermal power plants, chemical plants, glass factories, cement plants, metallurgical plants and steam locomotives.

The natural dirty substances on the surface of the insulator are easily washed away by rainwater, while the industrial dirty substances are attached to the surface of the insulator and are not easily washed away by rainwater. When the air humidity is very high, it can conduct electricity and the leakage current will be greatly increased. In the case of wooden poles, the leakage current can cause the wooden poles and wooden crossbows to burn; If it is an iron tower, it can cause serious flashover and damage to the insulator, causing a power outage.

In addition, partial discharge will occur on the surface of the insulator in some dirty areas in bad weather, which will interfere with radio broadcasting and communication.

Spray non-conductive cleaning liquid with *** to directly decontaminate without affecting the normal transmission of the line.

Regularly clean and maintain insulators, replace defective insulators, increase the unit leakage ratio of insulators, coat insulators with antifouling hydrophobic coatings, install wind cleaning rings, and avoid heavily polluted areas when designing transmission lines.

As a new technology and new material, one-component RTV (RoomTemperatureVulcanizedSiliconeRubber) power antifouling flashover coating has been widely used in the field of antifouling flashers in power systems due to its outstanding advantages of long-term effect and maintenance-free, and has achieved remarkable results.

The one-component RTV coating has good hydrophobicity and hydrophobic migration, which greatly improves the pollution resistance and lightning voltage of the external insulation of power transmission and transformation equipment, and the pollution resistance lightning voltage can be increased by more than 2 times compared with the porcelain bottle without envy paint. Hydrophobicity refers to the fact that the force between the molecules of a non-polar solid medium and the water molecules on its surface is smaller than the cohesive force between the water molecules themselves, and the surface moisture often forms isolated water droplets, rather than a continuous water film. The hydrophobic mobility of RTV refers to the hydrophilic dust and dirt existing on the surface of the RTV coating after a certain period of time, that is, the hydrophobic nature of the RTV coating migrates to the surface of the dirty layer. At this time, after spraying water droplets on its surface, the dirt layer is difficult to infiltrate due to hydrophobicity, and only discontinuous water droplets remain on the surface of the dirt layer, which greatly improves the anti-pollution flashover ability of electrical equipment.

One-component RTV power antifouling flash coatings have good electrical, physical and chemical properties. Its breakdown voltage is above 17kV mm; Between 40 +80, it can be operated for a long time, and the temperature resistance is unchanged; Good adhesion to porcelain insulators; Spraying at room temperature for 30 minutes can dry the surface, 24 hours can be cured, long-term elasticity; Resistant to acid and alkali, oil corrosion, and will not blister, wrinkle, discolor and fall off due to it; Resistant to environmental aging, the coating does not crack, chalking, peeling and falling off under natural conditions, and the life span of the outdoor brother slip is more than 5. It can be used in the external insulation of electrical equipment in power plants, chemical industry, steel, cement and other heavily polluted and heavily polluted areas and industries, with significant anti-pollution flashover effect.

Pollution flashover refers to the filth attached to the insulation surface of electrical equipment under humid conditions, its soluble substances gradually dissolve in water, forming a layer of conductive film on the insulation surface, so that the insulation level of the insulator is greatly reduced, and the strong discharge phenomenon occurs under the action of the electric field. There are many anti-fouling flash measures, the traditional method is the power outage cleaning in spring and autumn, as well as the use of silicone oil, silicone grease and other coatings, reasonable adjustment of the creepage ratio distance of the outer insulation, in recent years, the use of anti-flash climbing skirt, the use of RTV anti-fouling flash coatings, etc.

Measures to prevent high-pressure pollution flashover accidents.

1. Strictly implement the whole process management regulations on the quality of insulators in the power system, strengthen management, and ensure quality.

2. Adhere to the regular salt density measurement, pollution investigation and operation inspection of the outer insulation surface of power transmission and transformation equipment, take anti-pollution flashover measures and improve the distribution map of pollution areas according to changes in a timely manner, and do a good job in the basic work of anti-pollution flashover.

Determine the number and location of sampling points for the salt density test for sampling.

Samples for salt density testing are generally taken annually.

February and March before the rainy season.

The results of the salt density measurement should be documented and followed up for comparative analysis to determine the cleaning interval.

Classification of dirt areas in order to determine the leakage ratio of electrical equipment in operation. The decision should be made based on the characteristics of sewage and wetting, operation experience and salt density value.

When the leakage ratio of the operating equipment cannot meet the requirements of safe operation, measures such as increasing the number of insulators, replacing antifouling porcelain, and using RTV coatings and silicone rubber climbing skirts can be taken.

3. The external insulation configuration of new and expanded power transmission and transformation equipment should be based on the distribution map of the polluted area and according to the urban development, the importance of the equipment, etc., and the type, umbrella type and creepage distance of the insulator should be selected under the premise of leaving a margin.

4. The creepage distance of the external insulation of the operating equipment should be adapted to the pollution classification in principle, and the creepage distance should be adjusted if it is not satisfied.

5. Adhere to the timely and quality-assured cleaning, implement the "cleaning responsibility system" and "quality inspection system", and strictly implement the "Charged Water Flushing Regulations" for live water flushing, and be equipped with well-trained skilled operators.

6. Silicone rubber composite insulator has a strong anti-pollution flashover ability, which can effectively prevent the pollution flashover accident of the transmission line, and can be adopted according to the situation of the pollution section, and pay close attention to the sealing quality of its end and control the bird dropping flashover.

7. The surface of the substation equipment is coated with "RTV coating" and the installation of "anti-fouling flashover auxiliary umbrella skirt" is an important measure to prevent pollution flashover from occurring in the equipment, and it is used according to the requirements of the "Guiding Opinions on the Use of Anti-fouling Flashover Auxiliary Umbrella Skirt" and "Guiding Opinions on the Use of Anti-fouling Flashover BTV Coating" (Tune Network [1997] No. 130), but the arrester should not be equipped with an auxiliary umbrella skirt.

8. The creepage distance of the external insulation of indoor equipment should comply with the "Technical Conditions for Indoor Equipment", and the cleaning should be arranged in a timely manner, and the creepage distance should be increased in severely humid areas.

9. Strengthen regular zero measurement in operation and maintenance, and carry out regular and irregular cleaning work.

Our company's 220kv hanging porcelain bottle should be measured to zero value work.

If a zero-value porcelain bottle is found, it should be replaced in conjunction with a power outage.

The new porcelain bottle should be tested for insulation resistance and withstand voltage, and it is strictly forbidden to use it if it is unqualified.

Cleaning the dirt on the surface of the porcelain bottle is an important work to prevent pollution flashover accidents, so it should be in line with the principle of sweeping and sweepingDuring the major and minor repairs (pre-test) of the equipment, the surface of the electric porcelain bottle should be cleaned.

10. Prevent the porcelain bottle in the opening room from staining and flashing accidents.

The switch room should be equipped with an exhaust fan, and the doors and windows should be able to prevent the entry of pollutants such as water vapor, dust, and smoke to ensure that the switch room is dry and clean.

Combined with equipment maintenance, the porcelain bottle is cleaned regularly.

It is recommended to apply this product in a state of power failure, and the construction temperature is 30 50. Perform a routine sweep on the surface of the porcelain bottle or glass to wipe off contaminants, and RTV keeps the surface clean. The thickness of the coating should depend on the degree of pollution on site, and the thickness of the coating should not leak, drip, or hang wire, and the surface should be smooth and smooth.

Thank you for the trouble to adopt!

Under adverse meteorological conditions (such as fog, dew, drizzle, etc.), flashover will occur along the surface of the wet insulator, resulting in pollution flashover accidents in the power system. Pollution flashover threatens the safe and stable operation of the power system, affecting the local power supply, affecting the power grid, and even cracking the entire power grid.

The occurrence of pollution flashover has an impact on the power supply system, causing huge losses to the national economy and land economy.

Room temperature silicone rubber, referred to as RTV antifouling flash coating, is composed of trichloroethylene, tetrachloroethylene, Kexi organic composite solvent, KX-240H and other components, the hydrophobicity and hydrophobic mobility of the coating are the key to significantly improve the pollution lightning pressure level. The coating is applied to the surface of the porcelain and cures to form a layer of adhesive film. The adhesive film has excellent hydrophobicity under clean conditions, when the surface of the adhesive film is covered by dirt, the small molecule hydrophobic groups in the adhesive film can quickly pass through the dirt layer and migrate to the surface of the dirt layer, so that the surface of the dirt layer also has excellent hydrophobicity.

In this way, under humid climatic conditions such as fog, dew, drizzle, etc., it is difficult to wet the surface of the dirt layer, if the dirt layer is moistened for a long time, the surface of the dirt layer will not form a water flow and a water film, but will exist independently with many discontinuous small water droplets, thereby greatly stifling the generation of leakage current, and significantly improving the pollution flash voltage of the insulator.

Anti-corona paint, that is, insulating paint, has good electrical insulation properties. It is composed of a lacquer base (film-forming material) and some auxiliary materials. Film-forming materials mainly include natural resins, synthetic resins, asphalt, dry oil, etc., which have a high viscosity at room temperature or are solid.

The auxiliary materials are solvents, diluents, fillers and pigments, etc., which generally only dissolve the paint base, adjust the viscosity, and do not participate in film formation. Reactive diluents with reactive groups are involved in film-forming chemistry and are actually building blocks of the paint base. Insulating varnish can be divided into impregnating paint and coating paint according to its use.

It is mainly used to impregnate the coils and insulating parts of motors and electrical appliances, fill their gaps and micropores, and solidify the impregnated material into a dense whole after drying or heating and drying, so as to improve its breakdown strength, mechanical properties and moisture resistance, heat resistance, heat conductivity, oxidation resistance and other properties. Lacquer for the manufacture of insulating cloth and lacquered paper is also impregnated lacquer. The basic requirements for impregnating paint are:

The lacquer base should have a high solid content but low viscosity so that the lacquer can penetrate deeply into the pores of the impregnated object; Good curing performance, fast drying, strong adhesion; Thermoelastic; It does not corrode copper and coils or other materials; It has high dielectric properties, moisture resistance, heat resistance, oil resistance and good chemical stability.

Semi-conductive varnish with a surface resistivity between 103 and 1011 ohms. It is mainly used for anti-corona paint of high-voltage motor windings, so it is also often called anti-corona paint. Corona produces various optical radiation, heat, oxides such as ozone and nitrogen, which are very harmful to insulating materials, so it is extremely important to prevent corona for high-voltage motors.

Antifouling flash coating is an RTV coating used in adverse weather conditions (such as: fog, dew, drizzle, etc.), flashover will occur along the wet surface of the insulator.