Study On Pollution Characteristics Of Insulators Under Ventilation Conditions In Indoor Substation And Optimization Of Anti-pollution Flashover

Insulators are widely used in power line circuits,substations and other nodes.Insulators and flashovers have always been an important threat to electrical insulation reliability,causing local regional and large-scale blackouts.At present,the research on the fouling characteristics and the pollution flashover characteristics of insulators under outdoor natural conditions has been rich and mature.In contrast,the phenomenon of indoor insulators and pollution flashes also existed and did not attract enough attention: indoors Substation ventilation and outdoor natural pollution are two different fouling conditions.In both cases,the insulators should have different fouling characteristics;the indoor insulators should be protected against pollution flashing under their own fouling characteristics,except for routines along the user.In addition to experience,one should also improve the direction of the ventilation system from the source to prevent dirt and pollution.Therefore,this topic has the vacancy in the field of indoor substation to fill the insulation characteristics of insulators,and provides the meaning of anti-sewage and pollution flashing methods unique to indoor insulators.Through the collection and analysis of the case of indoor insulator pollution,it is known that there is a strong correlation between indoor insulator pollution and pollution flashover and its ventilation system.Therefore,field investigations and investigations were conducted in several 110 KV high-voltage indoor substations in Chongqing.Obtaining the ventilation system setting and equipment running pollution of the indoor station reveals the imperfect and non-standardized situation of indoor and outdoor substation ventilation and anti-fouling,and it is feasible to improve the external insulation and pollution of indoor electric equipment from the perspective of ventilation system.Combined with the research methods and investigation results of outdoor insulator fouling characteristics,the indoor pollution conditions and the range of conditional parameters that can be used to study the indoor insulator pollution characteristics are analyzed.Based on the study of the characteristics of the outdoor insulators,the numerical simulation of the influence of several single-value conditions related to the ventilation system on the amount of high-pressure casing fouling in the indoor main transformer room results in the following results: The influencing factors are: particle size > incoming wind speed > air relative humidity;large contaminated particles are more likely to accumulate on the surface of the casing than the smaller particles,and reducing the particle size in the air can significantly reduce the fouling.The order of mass;when the wind speed increases in the range from weak wind to breeze,the amount of small particle size will decrease significantly,and to obtain a significant decrease in the amount of large particle size,the wind speed needs to be increased to the strong wind range;At high wind speeds,the mass of particulate matter of smaller particle size is more easily obtained in the order of magnitude,while the mass of particulate matter of larger particle size is difficult to reduce by an order of magnitude,but an absolute value of the amount of reduction can be obtained.The relative humidity of the air has the least influence on the deposition behavior of the contaminated particles on the surface of the high-pressure casing,and the particle deposition amount of each particle size increases slightly with the increase of the relative humidity.Based on the obtained fouling characteristics,the technical measures and optimization schemes for improving the ventilation system to prevent indoor insulator pollution are qualitatively analyzed,and the optimization cost and benefit are quantitatively estimated.The research results in this paper can provide a theoretical reference for the study of pollution characteristics and pollution flashover characteristics of a wider range of indoor insulators,and can be used as a research basis for further standardizing the design of urban high-voltage indoor substation.