a.Moisture – results in decrease in the measured
value of insulation resistance.
b. Dust & dirt deposits – reduces
insulation resistance & failure of insulation due to oxidation.
c. Oil & Grease – prevents heat
dissipation & causes dirt and dust to settle on the insulation.
d. Ageing – over the period of time the
insulation deteriorates due to it getting affected by temperature variation,
mechanical stresses, vibrations, moisture and some varnish tend to become hard
with age & crack during the operation
e. Temperature – Excessive temperature dehydrates and oxidizes the
insulation, making it brittle & disintegrate under vibration & shock
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