Insulation Resistance Measurements On Motors - AEMC 1000N User Manual

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- LINE GUARD
MEGOHMMETER
Figure 13
windings of a three-phase
motor separated.
times this can be done at
the lead terminals while
other times the end bells
must be removed to get at
the lead wires of the coils.
By connecting the megohm-
meter as shown, the phase
insulation resistance value
can now be determined.
Read between phases "A"
and "B", then "B" and "C",
then "C" and "A".
+ EARTH
shows the
Some-
A
Megohmmeter Model 1000N/1100N
Figure 12
resistance to ground of a three-
phase motor winding. Since the
three-phase motors are internally
connected, it is only necessary to
connect one lead to the motor lead
and the other lead to the motor
frame as shown.
Figure 12
C
B
- LINE
- 19 -
shows reading
GUARD
+ EARTH
MEGOHMMETER
Figure 13
the