Since the need for high voltage electrical transformers there has been a need for an insulating material that could withstand the high electrical and physical stresses experienced around a core and windings.
Paper insulation in transformer windings.
Insulation in oil immersed transformers.
The oil paper insulation in power transformers is subjected to various stresses due to environmental conditions voltage and fault stresses.
The most common insulation today for high voltage windings in transformer is an enamel coating on the wire with kraft paper used between layers.
However for power transformers paper insulation is used for winding wire as well as in the form of strips of paper insulation.
The paper insulation of electrical windings is.
Insulating media in up to 11kv transformer is mostly comprised of paper wrapped around the conductor in transformer coils mineral oil and pressboard to insulate the coil from the ground.
The cellulose products is commonly used for paper insulation because of the high withstanding resistance it offers to the electromagnetically induced force.
Cellulose which is the main chemical component of cellulose paper is a unique.
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Enamel is used to insulate the windings of low voltage transformers.
The use of paper board as electrical insulation paper started in the early mid 20th century.