Motor ; Short Circuit

types

a) Turn to turn short
b) Phase, to Phase short
c) phase to frame short

Causes

The insulation of conductor is caused to be removed by:
a) Overload
b) Overheat
C) Rubbing of stator and rotor (bearing defect)
d) Ingression of liquid
defective rubber lining or gasket or wrong installatio:
terminal cable box
e) Vibration and thus movement of coil windings


Prevention
a) Ensure thermal overload relay is in good working condition.
b) Do not start and stop too frequently.
c) Bearing and alignment is good
d) Rubber lining or gasket is properly installed.
e) Ventilation ducts are not clogged.