03/04/2021

Class of Insulating Matrials

 

  • The temperature rise of the electric machine depends upon temperature rise of the insulating materials. 
  • The different types of insulating material are classified according to maximum temperature limits.

 

Class of Insulation

Insulation

Maximum temperature limits

Y

Cotton yarns and Fabrics, paper and fibrous material of cellulose, silk neither impregnated nor immersed in liquid dielectric

90 0C

A

Cotton yarns and Fabrics, paper and fibrous material of cellulose, silk impregnated or immersed in liquid dielectric

105 0C

E

Synthetic organic films and material having same thermal stability

120 0C

B

Mica, asbestos or glass fibre base material combined with an organic binding agent

130 0C

F

Mica, asbestos or glass fibre base material combined with suitable synthetic binding  and impregnated agent

155 0C

H

Mica, asbestos or glass fibre base material combined with suitable silicon binding  and impregnated agent

180 0C

C

Mica, ceramic, glass, quartz used with or without inorganic binding agents

Above  180 0C

 

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