Guangdong Yufeng Industries Co., Ltd.
Guangdong Yufeng Industries Co., Ltd.


What Are The Commonly Used Anti Pollution Flashover Measures In China's Domestic Power System At Present?

1. Regular cleaning: Dry cleaning with live machinery, flushing with live water, time-consuming and labor-intensive;

2. Replacing insulators: labor-intensive and time-consuming;

3. Apply silicone oil and grease on the surface of the insulator: it can only be effective for a short time;

4. Use RTV anti fouling and flashing organic silicone coating. RTV is a type of room temperature vulcanized silicone rubber, which has become the preferred coating for anti pollution flashover of power system transmission and transformation equipment due to its unique hydrophobicity, hydrophobicity migration, excellent anti pollution flashover characteristics, as well as advantages such as long-term performance, weather resistance, ozone resistance, and maintenance free.

The anti fouling flashover mechanism of RTV coatings can be analyzed from several aspects such as hydrophobicity, hydrophobicity migration performance, and voltage distribution:

  • Good hydrophobicity. After applying RTV anti pollution flashover coating on the surface of the insulator, the resulting coating covers the entire surface of the insulator, isolating the contact between the insulation product and pollutants. When the contaminated substance lands on the surface of the insulator, it comes into contact with the coating of RTV anti pollution flashover coating. The performance of the coating becomes the surface performance of the insulator.

  • Hydrophobic mobility. Only substances with hydrophobicity cannot be used as anti pollution flashover coatings for insulators. They must also have excellent hydrophobicity migration, that is, when there is pollution, the hydrophobic layer will reach the outermost layer and continue to exert hydrophobicity.

  • The voltage distribution is uniform. Due to the strong hydrophobicity of RTV coatings, it is difficult to form a continuous conductive layer on the surface of the dirt, so uneven voltage distribution will not occur.

The Difference Between RTV and PRTV

RTV and PRTV are both anti pollution flashover coatings, which are now common anti pollution flashover coatings. PRTV, also known as RTV-2, is an upgrade of RTV and is the most commonly used coating in State Grid, power plants, and power generation groups. So, let's briefly introduce which performance of the upgraded anti pollution flashover coatings is better:

  • High hydrophobicity

The hydrophobicity angle of PRTV coatings is generally greater than 90 degrees, while the hydrophobicity angle of PRTV coatings is greater than 100 degrees.

  • Excellent corrosion resistance

PRTV coatings have excellent resistance to chemical and electrochemical corrosion, as well as resistance to acids, alkalis, salts, and most organic compounds. Capable of adapting to various harsh climatic environments and corrosive media environments.

  • Unique surface performance

Has excellent electrical insulation performance.

  • Unique non fouling performance

Anti dust adhesion, general dust can be automatically washed away by rainwater, and local stubborn stains can be adhered. Simply wipe with a cloth to restore the clean surface.

  • Excellent physical and mechanical properties

The coating has excellent physical and mechanical properties: high adhesion, high hardness, high flexibility, high wear resistance, and impact resistance. Good adhesion and convenient construction. The perfect combination of flexibility and hardness on the surface can withstand wear, collision, and impact.

  • Heat and cold resistance

It can withstand the test of severe cold and heat, and can be used normally within the temperature range of -40 ℃ -140 ℃, without peeling, wrinkling, peeling, or cracking.

Analysis Of The Advantages And Disadvantages Of Commonly Used Anti Pollution Flashover Measures And Methods - Anti Pollution Flashover Coatings Are Relatively Durable

1. Common anti pollution flashover measures

At present, there are five main methods for preventing pollution flashover of transmission line insulators.

(1) Regularly clean the insulators. Generally, it is cleaned once a year before the rainy season.

(2) Replace defective and zero value insulators. Regularly conduct insulation testing on insulator strings, and promptly replace defective and zero value insulators if found.

(3) Increase the unit leakage distance of the insulator string. The greater the leakage current on the surface of the insulator, the more severe the pollution flashover, and the magnitude of the leakage current is inversely proportional to the unit leakage distance of the insulator string. Therefore, it is possible to increase the number of insulator pieces or change them to pollution resistant insulators to increase the unit leakage distance of the insulator string.

(4) Using anti fouling paint. For insulators in heavily polluted areas, hydrophobic anti fouling coatings can be applied to their surface to enhance their anti fouling ability.

(5) Composite insulators shall be used. Composite insulators are composed of silicone rubber as the basic insulator. The use of composite insulators has been widely used in new transmission lines in recent years and is an effective measure to prevent pollution flashover.

2. Advantages and disadvantages of various anti pollution flashover methods

(1) Regular cleaning. This method is the most widely used and simplest method for preventing pollution flashover, and has been widely used by various power supply departments. The disadvantage is that cleaning is done periodically, which wastes a lot of valuable power outage time. Moreover, it is necessary to adopt low resistivity water sources, which are difficult to obtain in some areas.

(2) Regularly conduct insulation testing on insulator strings. In the case of a large number of insulators, the amount of labor is also significant. Especially in certain heavily polluted areas, the testing cycle should be shortened.

(3) Increase the number of insulator pieces appropriately. There are many methods to increase the current leakage value, but due to the influence of strength and wire height, the number of insulator pieces cannot be infinitely increased.

(4) Use hydrophobic coatings. The superiority is obvious and the cost is low. Mainly including silicone oil, silicone grease, floor wax, and room temperature vulcanized silicone rubber.

(5) Composite insulators. Light weight, high mechanical strength, good anti pollution flashover performance, hydrophobicity, high pollution flashover voltage, long cleaning cycle, and self-cleaning properties. The disadvantage is that synthetic insulators are expensive, bear low radial and perpendicular stress to the centerline, and silicone rubber has a relatively soft texture, which is easy to damage and damage the sealing performance, resulting in a decrease in insulation performance.

Protective Cover For Autumn Inspection Of Power System - Anti Pollution Flashover Coating Project

Autumn inspection, also known as autumn maintenance. It is a seasonal routine and important work of the State Grid of China and other power systems, which will thoroughly address the safety hazards exposed during the peak summer season, in order to actively prepare for the power grid's peak winter season and conduct a comprehensive and planned "physical examination" of equipment. Transmission lines and power equipment have been exposed to the outside for a long time, and after experiencing long-term high temperature and heavy load operation, there are inevitably safety hazards for power equipment. The dirt attached to the insulation surface of electrical equipment gradually dissolves in water under humid conditions, forming a conductive film on the insulation surface, greatly reducing the insulation level of the insulator and causing strong discharge under the action of the power field. In order to avoid this phenomenon, our anti pollution flashover engineering protection is necessary, which is also a very important power protection measure for the annual spring and autumn inspection of the power system.

What is anti pollution flash coating? Anti pollution flashover coating is a special insulation coating for power systems, which is widely used in power systems due to its excellent anti pollution flashover performance. The hydrophobicity and migration of anti pollution flashover coating are the key to significantly improving the pollution flashover voltage level.

Anti pollution flashover coating is applied to the surface of electric porcelain bottles, and after curing, a layer of adhesive film is formed. 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 inside the film can quickly pass through the dirt layer and migrate to the surface of the dirt layer, making the surface of the dirt layer also have excellent hydrophobicity. In this way, under humid weather conditions such as fog, dew, and drizzle, it is difficult to wet the surface of the pollution layer. If the pollution layer is kept moist for a long time, it will not form water flow and water film on the surface, but will exist independently as numerous discontinuous small water droplets, greatly suppressing the generation of leakage current and significantly increasing the pollution flashover voltage of insulators.

Instructions for the use of our anti pollution flash coating (RTV/PRTV)

The Guiding Principles for the Use of Anti Pollution Flashover Coatings for External Insulation of Transregional Power Grid Transmission and Transformation Equipment of the State Grid of China (Trial) have re standardized the PRTV long-term anti pollution flashover coating (including RTV coating), which is the highest standard level of national anti pollution flashover coating products. The product performance indicators meet all type test standards of this standard, and the main performance exceeds the standard value. Its performance characteristics include: ultra long aging, high resistance to electrical corrosion, high insulation and mechanical strength, high pollution flashover voltage, and other comprehensive functions, which can ensure the stable operation of external insulation of transmission and transformation equipment.

The product performance of our anti pollution flash coating (RTV/PRTV):

(1) Significantly increase the external insulation pollution flashover voltage of power transmission and transformation equipment, and increase its pollution flashover voltage to over 200%;

(2) This product is a single component and does not require mixing during use, ensuring quality and reducing waste. It is suitable for power outage or live spraying construction;

(3) The coating has hydrophobicity and hydrophobic migration characteristics, which can enhance the insulation resistance of the external insulation in a dirty and wet state;

(4) Under normal usage conditions, the external insulation of power equipment can be free from cleaning and maintenance, with a functional lifespan of over 15 years, thereby saving a lot of manpower and resources;

(5) This product has high resistance to electrical corrosion, dirt and moisture, and has reached a high level of resistance to leakage and marking, thus ensuring its resistance to electric ignition and high pollution flashover performance;

(6) The product has excellent insulation performance and can have flame retardant properties. If it is electrocuted, its residue is non-conductive, leaving no hidden dangers for equipment operation;

(7) The product has high mechanical strength, is suitable for wind and sand environment areas, and does not affect equipment maintenance work;

(8) The product has a certain degree of anti snow melting and anti icing effect, so it is also suitable for application in high cold areas;

(9) This coating is non flammable, non explosive, and not toxic to hazardous materials.

(10) High voltage electrical equipment with external insulation coated with this coating can undergo preventive testing normally. The testing method and results are not affected.

Anti Pollution Flash Coating, Several Issues Of Concern To Everyone

With the increasing severity of power pollution flashover, various types of coatings used for power pollution flashover are increasingly appearing in the market. Among them, anti pollution flashover coatings, as a common anti pollution flashover product, have an extremely important position in the market. No matter which type of power equipment, it needs to meet certain market needs in use, and anti pollution flashover has certain particularity in use, Maintaining its use also requires attention to many issues. Let's discuss and take a look together!

Firstly, there is the phenomenon of aging. For this type of anti pollution flash coating, due to the main body being silicone rubber and long-term exposure to the outside during use, the phenomenon of aging has become almost inevitable, coupled with the effects of ultraviolet radiation and electromagnetic fields. So it is important to pay attention to controlling the service life during use. Generally speaking, it is safer to use it within 5 years.

Secondly, it is the adhesion of anti fouling flash coating. Is the adhesion good or bad for this type of coating? When using, of course, we hope for greater adhesion to prevent detachment, but after using composite coatings, we also hope for less adhesion because it is easier to remove in the later stage. So the issue of adhesion is an area that needs to be focused on. Of course, there are many ways to remove coatings.

The third is the hydrophobicity of the coating. For anti pollution flashover coatings, hydrophobicity is a very important performance, and the improvement of the flashover voltage depends on the hydrophobicity of this coating. Generally speaking, the criterion for determining hydrophobicity is mainly based on whether the hydrophobicity angle of water droplets on the cornea is greater than 90 degrees. For example, the larger the angle, the shorter the migration time and the lower the probability of line failure.

Anti Pollution Flashover Coating Is A New Type Of Building Material

With the increasing variety in the paint industry, the scope of general application is also becoming more and more extensive. We all know that the continuous rapid development of China and the world economy is also causing increasingly serious air pollution. Therefore, the continuous increase in rainwater or salinity has a certain impact on the paint on the outer end of buildings. In such a situation, the natural accumulation of dirt on the exterior of outdoor equipment in the power system is increasing. In such a situation, anti pollution flashover coatings can be chosen to achieve this protective effect.

There are various types and characteristics of anti pollution flash coating models, and the composition is mainly composed of trichloroethylene and tetrachloroethylene. The application of such organic composite materials has a prominent protective effect on outdoor equipment in the power system. In this situation, the widespread use of this coating is becoming increasingly diversified, improving its technological advantages and recognition in the industry, which is why it plays a crucial performance role in the industry.

Anti pollution flashover coating is a widely used new type of material, and the use of any new building material has a hard requirement of cost-effectiveness. It is naturally important in various bidding and tendering processes, which to some extent affects the final cost and even the success of the bidding process. In daily life, almost all products, their users will consider the issue of cost-effectiveness, and cost-effectiveness sometimes becomes the only requirement of any product.

The antifouling flashover coating has been added with some nano level high insulation reinforcement materials, so that it has high mechanical strength and adhesion, can withstand the erosion of strong wind and sand climate (for example, the area at the tuyere, electric locomotive, etc.), and meets the requirements of equipment maintenance pedal In particularly severe cases of pollution (such as due to the coverage of a large amount of dust pollution, although the coating is not ineffective, the hydrophobicity is difficult to migrate to the outer layer of the pollution), necessary water flushing or cleaning can be carried out. The mechanical properties of the coating can reach the strength of the umbrella skirt sheath material of the composite insulator.

Characteristics and Construction Instructions of Anti pollution Flashover Coatings(RTV/PRTV)

Anti pollution flashover coating is a new type of electrical functional material specially designed for the power grid and various power generation, transmission, and consumption customers to permanently and completely eliminate the hidden danger of equipment pollution flashover.

Electrical equipment that is exposed to the outdoors for a long time is easily affected by the environment, and its insulation level can easily decrease in extreme cases, leading to electrical insulation failures. Therefore, improving the insulation performance of outdoor electrical equipment in different environments has become one of the main concerns of electrical equipment maintenance personnel. In recent years, anti pollution flashover coatings have been a new material used to improve the insulation level of electrical equipment, and have been rapidly developed and widely used in China due to their outstanding characteristics such as long-term effectiveness and maintenance free.

The production materials of anti pollution flashover coatings have hydrophobicity and unique hydrophobicity migration characteristics, which means that the hydrophobicity of materials can migrate to the surface of the dirt layer, and no continuous water film is formed on the coating surface of electrical equipment in severe weather (rain, fog, dew, drizzle). The coating surface has hydrophobicity, which can effectively prevent cement and chemical pollution from scaling on its surface, making it widely applicable to various natural and industrial environments. It has excellent insulation performance, excellent mechanical performance, strong adhesion, resistance to dust adhesion, corrosion, long service life, corona resistance, aging resistance, anti icing effect, and weather resistance.

The spraying work of anti pollution flash coating should be strictly carried out in accordance with its user manual. Before coating, moisture, oil stains, and other insulators should be cleaned up, and construction should also be carried out under meteorological conditions without rain, dew, or wind and sand. During construction, the metal parts at both ends of the equipment should be wrapped and protected. During spraying, protective measures should be taken to avoid affecting the operation of adjacent equipment. The implementation of coating spraying should be carried out after the insulation testing of electrical equipment is completed. Electrical equipment with unqualified insulation should be treated and replaced before coating spraying.

How To Solve The Problem Of Insulator Anti Pollution Flashover?

Insulators are mainly divided into three categories: porcelain insulators, glass insulators, and silicone rubber composite insulators. Porcelain insulators and glass insulators have wide applications in power grids and other power supply systems due to their good mechanical strength and easy cleaning and maintenance. However, due to the general hydrophobicity of the surface, discharge flashover is prone to occur when the pollution is severe and damp.

Based on the characteristics of glass and porcelain insulators, it is recommended to use high self-cleaning anti pollution flashover coating for anti pollution flashover treatment of insulators. High self-cleaning anti pollution flashover coating is a special anti pollution flashover coating developed specifically for high oil pollution and high pollution environments. It is based on ordinary anti pollution flashover coatings (RTV, PRTV), retains the original characteristics of the anti pollution flashover coating, and introduces organic fluorine monomers into the coating, The anti fouling flashover coating combines the hydrophobicity of organic silicon and the hydrophobicity of organic fluorine materials, making it a type of anti fouling flashover coating that is hydrophobic and oil repellent, prevents oil scale adhesion, and has good surface self-cleaning performance.

In order to overcome the situation where glass and porcelain insulators are prone to flashover due to surface contamination and moisture, a layer of hydrophobic anti flashover paint is usually sprayed on the surface of the insulators. Although ordinary anti flashover paint has good hydrophobicity, it is difficult to clean the surface after dust has accumulated, greatly increasing the difficulty of daily maintenance.

In response to the difficulty of dirt accumulation on the surface of the anti pollution flashover coating, which is difficult to clean after accumulation, it is recommended to use multi-functional insulator protective agent RS-80 for cleaning. After cleaning with multi-functional insulator protective agent, a semi permanent nano level protective film will be formed on the surface of the cleaned object, making the equipment shiny as new; It can also repair the surface of aged silicone rubber (anti pollution flashover coating, composite insulator) to achieve initial surface performance, with hydrophobicity and self-cleaning performance.

What Is Anti Pollution Flash Coating?

Room Temperature Vulcanized Silicone Rubber, abbreviated as RTV anti fouling flash coating, has been rapidly developed and widely used as a new technology and material in China in recent years due to its outstanding characteristics of long-term effect and maintenance free. In China, RTV coatings have undergone a development process of multi-component, dual component, and single component. After years of grid operation, single component RTV long-term anti pollution flashover coatings and single component PRTV ultra long effect anti pollution flashover coatings are mainly suitable for transmission and transformation equipment of various voltage levels below 750KV: suspension insulators (porcelain and glass), support insulators, switches, gates, lightning arresters, transformers, coupling capacitors, wall bushings, etc, And various porcelain components for indoor substation equipment in humid areas.

Is The Price Of Anti Pollution Flash Coating Prtv Expensive?

There are many types of anti pollution flashover coatings. Anti pollution flashover coating - PRTV (RTV - II) insulation flame retardant coating, as well as coating for reactor treatment, JY-1, DL-66 flame retardant thermal conductive coating, and reinforced anti pollution flashover coating PRTV. The raw material cost of PRTV anti pollution flash coating is 120 yuan/KG, and many 40/KG and 50 yuan/KG coatings in the market are definitely fake products. Electric power products involve personal and property safety, and there are many coatings sellers in the market. We must choose legitimate manufacturers to produce them, and we must be cautious in purchasing them.

Pollution Flashover Has Become A Common Problem That Seriously Affects Power Transmission

During the use of power transmission equipment, due to environmental factors, many faults and problems have occurred in the entire circuit transmission equipment. This type of pollution flashover problem has caused widespread power outages nationwide, indicating that this type of problem cannot be underestimated. The traditional solution to such problems is to regularly clean the stains on the insulation terminals, which can have a significant impact on both human and financial resources during the anti pollution flashover process.

At present, many power transmission units ensure that insulation terminals can avoid accumulating a lot of stains through the use of high-quality coatings during the maintenance of lines. This type of coating uses very good hydrophobic organic substances, which can prevent stains from slipping off after being dissolved in water in rainwater or humid air, ensuring the early formation of an electric film layer on the insulation terminals and avoiding the occurrence of some accidents. We need to choose some of the best products in this type of anti pollution flashover product to ensure that these lines reduce unnecessary pollution flashover issues to a greater extent during daily operation.

This type of coating product needs to have some good advantages and properties. After spraying, it must have a good service life, and will not fall off during long-term use. It can also effectively resist acid and alkali pollutants caused by current severe atmospheric pollution. With the improvement of material technology and industrial technology, anti fouling flashover coatings have made the entire coating more effective and outstanding, significantly improving its service life.

What Are The Sources Of Pollution That Cause Pollution Flashover

With the changes of the times and the development of social productivity, more and more anti pollution flashover coatings are used. Of course, this is also due to the intensification of pollution. So what are the aspects of pollution?

Anti pollution flashover coating RTV (PRTV) pollution can be divided into two categories according to its source:

Category 1: Natural type pollution. Mainly sourced from natural environments such as oceans, swamps, and soil. Common pollutants include coastal seawater pollution, farmland dust pollution, saline alkali farmland pollution, and sandy soil pollution.

Category 2: Industrial pollution. This type of pollution mainly comes from various industrial production and the products of various forms of fossil fuel combustion. Common pollutants include general industrial pollution, chemical pollution, power plant pollution, metallurgical pollution, cement pollution, highway pollution, and so on.

So some people may ask, what are the common components of atmospheric pollutants and the impact of meteorology on environmental pollution?

The sediment pollution on the surface of insulators can be divided into many types according to the nature of the pollution sources in their respective regions, but they are all closely related to atmospheric pollution in various regions. According to information on atmospheric environmental pollution, the composition of pollutants in the atmosphere often varies due to different pollution sources, industrial raw materials, and processes, resulting in different emissions.

The common main components include sulfur oxides, nitrogen oxides, carbon oxides, hydrocarbons, and particulate matter.

Common particulate matter includes sulfates, nitrates, organic compounds, metals, and metal oxides.

These compounds in the atmosphere have a significant impact on the deposition of dirt on the surface of insulators. Meteorology is an important factor affecting environmental pollution. Wind direction, wind speed, temperature, pressure, cloud cover, rainfall, airflow, and humidity all directly affect pollutants. Air pressure, wind speed, and humidity directly affect the emission and diffusion of pollutants. The dominant source of pollution often accumulates more pollutants on the windward side and can be transported far away. Especially when the meteorological inversion layer appears, it often causes very serious atmospheric pollution.

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