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Ron_04
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hi everyone...i want to know tht how we determine the amount of porcelain insulation to be done in any electrical systems situated in a substation? please help
Ron_04 said:thank u very much for ur explanation...but i want to knw one thing tht is like in bushing of a transformer we do insulation to protect the transformer from surface current so why again creepage current...can u xplain me the creepage current please
Ron_04 said:ok thanks for the xplanation...but one more foolish question is how can creepage current flow through insulation? i mean to say how can a insulator conduct a current?
I believe is the stuffs deposit on the surface that break down and conduct.
jim hardy said:OP asked about electric utility insulators?
That was my understanding, so it is likely to be 60Hz
Yungman is exactly right.
The individual ceramic discs are mushroom shaped so that rain runs over top to edge and drips off leaving underside dry so it retains insulating capability.
Near the ocean or on a foggy morning inland you can hear high voltage insulators "sizzle" as the deposits absorb moisture and become conductive. A good rain will wash them clean.
search on 'insulator wash system'
there's some brave folks who wash them while energized..
I can assure you I am not one of the brave one!:rofl:
http://www.wilorton.com/HotLineIns.htm [Broken]
The amount of porcelain insulation is determined by measuring the surface area of the object to be insulated and calculating the thickness of insulation needed to achieve the desired level of insulation.
The purpose of porcelain insulation is to provide thermal protection and prevent heat loss or transfer. It is commonly used in electrical equipment, such as wires and transformers, to prevent overheating and ensure safe operation.
The amount of porcelain insulation needed can be affected by the type of material being insulated, the temperature and environmental conditions, and the required level of insulation. The shape and size of the object may also play a role in determining the amount of insulation needed.
The thickness of porcelain insulation is determined by considering the thermal conductivity of the material, the desired level of insulation, and the environmental conditions. It can be calculated using mathematical equations or determined through testing and experimentation.
There are different types of porcelain insulation available, including mica, glass, and ceramic porcelain. Each type has its own unique properties and is suitable for different applications. It is important to choose the right type of insulation based on the specific needs and requirements of the object being insulated.