CHARACTERISTICS OF A GOOD INSULATING MATERIAL
A good insulating material should possess the following characteristics.
II. High dielectric strength.
III. Low thermal expansion.
IV. Non-inflammable when exposed to arcing.
V. Resistant to oils or liquids, gas fumes, acids and alkalies.
VI. Should have no deteriorating effect on the material, in contact with it.
VII.Good thermal conductivity.
VIII.High mechanical strength
IX. High thermal strength.
X. Should be resistant to thermal and chemical deterioration.
XI. Should be resistant to moisture absorption.
THERE ARE FOUR PRINCIPAL AREAS WHERE INSULATION
MUST BE APPLIED. They are
a) between conductor /coils and earth (phase-to-earth),
b) between conductor /coils of different phases (phase-to-phase),
c) between turns in a coil (inter-turn) and
d) between the coils of the same phase (inter-coil)
