Insulation materials used in transformers and motors are classified based on the temperature withstand capability.
Some of the insulation classes used in transformers and induction motors are: Class Y, Class A, Class E, Class B, Class F, Class H and Class C.
Class Y:
- Maximum hot spot temperature for this type of insulator is 90oC
- Some of the materials used are cotton, silk, paper, wood without impregnated
Class A:
- Maximum hot spot temperature for this type of insulator is 105oC
- Cotton, Silk, and Paper when suitably impregnated are the type of materials used
Class E:
- Hot spot temperature is 120oC
- Materials possessing degree of thermal stability allowing them to be operated at a temperature 15oC above higher than Class A. Ex: wire, enamel etc
Class B:
- Maximum hotspot temperature is 130oC
- Mica, Glass fibre, asbestos, etc with suitable impregnation or coating substance
Class F:
- Hot spot temperature is 155oC
- Mica, glass, asbestos etc with suitable binding impregnation or coating substances capable of withstanding 25oC higher than Class B
Class H:
- Maximum hotspot temperature of 180oC
- Combination of materials such as mica, glass fibre, asbestos suitably bonded
Class C:
- Hotspot temperature above 180oC
- Mica, porcelain, glass, quartz and asbestos with and without inorganic binder
7 comments:
This is usually picked off the Earth sheathing of the mains cable coming into the premises, insulation machines US
Insulation oil plays a very important in transformer insulation system. In low voltage transformer, for example, transformers used in the range of 12-1000V or low power rating transformers there is no need of insulating oil in such transformers.
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There are few Benefits Of Thermal Insulation Material suppliers whose material you should use.Thermal Insulation materials, you may have seen it but you may be unaware of what it is. Heat insulation material are applied between materials, machines or blocks to reduce the transaction of the heat or thermal energy. These insulation materials are made up with low thermal-conductive material.
Thermal Insulation Materials, you may have seen it but you may be unaware of what it is. Heat insulation material are applied between materials, machines or blocks to reduce the transaction of the heat or thermal energy. These insulation materials are made up with low thermal-conductive material. There are few thermal insulation material suppliers whose material you should use.
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