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Megohmmeter Models 5000N/5100/5110
Insulation Resistance Measurements on Motors
Figure 17 shows reading the
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.
C
A
B
— LINE
GUARD
MEGOHMMETER
Figure 18
GUARD
- LINE
MEGOHMMETER
Figure
windings of a three-phase
motor separated. Sometimes
this can be done at the lead
terminals while other times
the
removed to get at the lead
wires
connecting
meter as shown, the phase
insulation resistance value
+ EARTH
can
Read between phases "A"
and "B", then "B" and "C",
then "C" and "A".
- 30 -
+ EARTH
Figure 17
18
shows
end
bells
of
the
coils.
the
now
be
determined.
the
must
be
By
megohm-
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