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Figure
15
connections to a transformer.
Make sure that the switches
and/or circuit breakers on
both sides are open. Check
the high voltage winding to
ground,
low
ground, and the resistance
between
them
winding grounded.
- LINE
GUARD
MEGOHMMETER
shows
the
voltage
to
with
no
A
Jumper
B
Jumper
C
+ EARTH
Figure 16
Megohmmeter Models 5000N/5100/5110
GUARD
- LINE
+ EARTH
MEGOHMMETER
Figure 16 shows the connec-
tions
insulation of a three-phase line
to ground by connecting the
jumpers between phases. This
gives a reading of all con-
ductors at once. If a load such
as a motor, heater, etc., is
attached to the other end of
the line, it will read the load
resistance to ground at the
same time. By removing the
jumpers,
made between the individual
conductors and ground.
- 29 -
Winding under test
Transformer
grounding lug
Figure 15
for
measuring
readings
the
can
be
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