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How to effectively prevent pollution flashover of insulators?

2023-02-03

2023-02-03

Due to the long-term exposure of the porcelain surface to the dirty atmosphere, the surface gradually accumulates dirt. These dirt containing salt, acid, and alkaline components are generally soluble in water, and the dirt is soluble in water. Finally, it is an electrolyte, which has strong conductivity. , so that the amount of leakage current increases, thereby greatly reducing the flashover voltage of the insulator, causing the flashover of the insulator, and the flashover of pollution is related to the nature of pollution.

Pollution is the main factor affecting the external insulation of electric porcelain, and the main factor affecting the flashover and tripping of pollution is the dominant effect of meteorological conditions. Dry pollution has a large resistance. Experiments have proved that it does not reduce the thousand-flash voltage of the insulator, because there is no water at this time. No electrolyte solution is formed; once the dirty porcelain surface is wetted, the flashover voltage of the insulator is reduced by more than 50%, so pollution and moisture are the two major factors leading to pollution flashover accidents.


Fog, dew, drizzle and snowmelt are the most dangerous meteorological conditions, affecting the largest proportion of pollution flashover and tripping. To sum up, due to the deposition of dirty substances on the surface of insulators, busbars, terminals, switches, transformers, switches, contactors, relays, contacts, etc., the insulation is reduced and the leakage current is increased, resulting in short circuits, arcs, Poor heat dissipation may cause flashover accidents. Seriously affect the normal operation, service life, operating costs, safety issues and economic benefits of the equipment.

The root cause of pollution flashover is that the insulator surface is deposited with dirty substances, which reduces the surface resistance of the insulator under humid conditions, increases the leakage current, and finally leads to flashover.

Since the recombination power after pollution flashover is very low, the pollution flashover of insulators is easy to develop into a large area and long-term vicious blackout accident. Therefore, the pollution flashover accident is extremely harmful, and the economic loss caused is quite large in the total accident loss of the line. proportion.

In the event of pollution flashover, we should clean the insulators in time to effectively prevent pollution flashover.

Insulation maintenance:

Cleaning can be carried out on equipment that is not powered off. The cleaning personnel trained by the National Electric Power Research Institute use professional tools and insulating cleaning agents to clean according to regulations, and effectively remove metal dust and dry dust on the surface and deep layers of the equipment on a safe basis and other pollutants, reduce equipment failures caused by pollutants (such as equipment malfunction, short circuit, poor contact, poor ventilation, etc.), improve equipment operating efficiency, restore them to the best working condition, and prolong the service life of equipment , to achieve the purpose of safety.

Live maintenance:

We can use a series of products and protection technology for electric power live maintenance to form a layer of nano-protective soft film on the surface of the equipment. The protective film has hydrophobicity and isolates moisture, salt spray, dust, oil and other pollutants in the environment from the environment. Direct contact with the equipment can also prevent the generation of static electricity in the electronic equipment and ensure the safe operation of the equipment.



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