- 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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