
23-16 Electrical Variables
Both voltage leads and current transformers must be connected to the proper phases, and the current
transformers must also be placed with the correct polarity. Most instruments use color-coded voltage
co
nnectors
. Co
rrect
po
larity
is in
dicated
on th
e
cu
rrent
tr
ansformers
by ar
rows
or sy
mbols,
an
d
co
m-
plete hookup and operating instructions are included. When single-phase instruments are used, the
same precautions must be followed for making connections.
23.5 Instrumentation
Table 23.2 lists a sampling of harmonic and power factor measuring instruments available from major
manufacturers. All instruments listed use some ...