The Analysis and Comparison of RTV and PRTV

Room Temperature Vulcanized Silicone Rubber is called RTV anti-pollution flashover coating in short, which is a new material used to improve the insulation level of electrical equipment and has emerged in recent years. It is a new technology and material with its outstanding features such as long-term effectiveness and maintenance-free that has been rapidly developed and widely used in China.

In China, RTV coatings have experienced a development process of multi-component, two-component, and one-component. Single-component coatings do not need to be blended when used. After the sealed package is opened, it can be directly sprayed and coated on the surface of the electric porcelain. After it is in contact with hydrone in air, it solidifies into a film, ensuring quality and reducing waste. With a simple construction, it is the most popular in field applications.

Initially, the service life of RTV coatings was five years. With the advancement of technology, product performance has been further improved, and the service life has also been increased to ten years, but this has reached the limit service life of RTV coatings.

RTV performance characteristics:

① Ensure the safe operation of power equipment.

② The coating is a one-component coating, and there is no need to blend during use. After the sealed package is opened, it can be directly sprayed and coated on the surface of the electric porcelain. After it is in contact with hydrone in air, it solidifies into a film, ensuring quality and reducing waste. With a simple construction, it is the most popular in field applications.

③ The coating has excellent electrical and mechanical properties, strong hydrophobic migration, strong adhesion and long service life.

④ The flammability index of the coating is not lower than FV-1 level. This indicator is especially suitable for the insulation and anti-pollution work of the DC transmission and transformation equipment of the power system.

⑤ The residue after the coating burns is not conductive, leaving no safety hazards to the operation of the equipment.

⑥ In the normal use of the equipment, the electrical external insulation equipment after spraying or applying RTV coating can be free of cleaning and maintenance, which saves a lot of manpower and material resources for cleaning external insulation equipment (generally tentatively ten years).

⑦ The coating is packed in iron drums (5Kg). One piece consists of 4 iron drums (20Kg) (carton packing).

In order to further increase the service life of RTV coatings, improve its comprehensive performance, and make it oil-repellent and self-cleaning, a new anti-pollution flashover coating - electric super long-lasting anti-pollution flashover coating (referred to as PRTV anti-pollution flashover coating) is launched.

PRTV coatings have better hydrophobicity and hydrophobic migration than RTV anti-pollution flashover coatings, as well as a certain degree of oleophobicity and good non-stick properties. Under severe weather conditions, a continuous water film will appear along the surface of wet and dirty insulators and flashover will occur. When the PRTV coating is applied, the surface of the dirt layer is also hydrophobic due to its hydrophobic migration. There are only discontinuous small water droplets on the surface of the dirt layer, and will not be infiltrated and connected, which makes the anti-pollution flashover performance of power equipment has been greatly improved.

Compared with the number of hydrophobic groups inside PRTV, the number of naturally lost hydrophobic groups is extremely small, so the effective service life of PRTV is very long. Compared with RTV coatings, PRTV coating base glue has a longer service life in nature. The modified negative molecular groups inside the PRTV after special technology treatment are far more abundant than those in RTV coatings, which is one of the reasons for its long service life. The PRTV power ultra-long-lasting anti-pollution flashover coating can be widely used in the external insulation and anti-pollution flashover of power transmission and transformation equipment.

Performance and use characteristics of RTV:

① Significantly increase the pollution flashover voltage of the external insulation of power transmission and transformation equipment, and the pollution flashover voltage can be increased to 200% to ensure the safe operation of power equipment.

② It can be sprayed directly on the surface of the electric porcelain when in use. After it is in contact with hydrone in air, it solidifies into a film, ensuring quality and reducing waste. With a simple construction, it is the most popular in field applications.

③ The coating material has hydrophobic and unique hydrophobic migration characteristics, that is, the hydrophobicity can migrate to the surface of the dirty layer, and it will not form a continuous water film on the surface of the coating in bad weather (rain, fog, drizzle).

④ In the normal use of the equipment, the external insulation of the power equipment can be free of cleaning and maintenance, which saves a lot of manpower and material resources for cleaning the external insulation (generally tentatively more than 20 years).

⑤ The surface of the coating is hydrophobic, so it can effectively prevent cement and chemical pollution from scaling on the surface, so this product can be widely used in various natural and industrial environments.

⑤ It has advantages of excellent insulation performance, excellent mechanical properties, strong adhesion, dust adhesion, corrosion resistance, long service life, corona resistance, aging resistance, and good anti-icing effect and excellent weather resistance.

⑦ The coating is non-flammable, and the burning grade after curing is FV-0. It is non-toxic and has a special smell.

⑧ The coating is packed in iron drums (5Kg). One piece consists of 4 iron drums (20Kg) (carton packing).