2–14 PQM POWER QUALITY METER – INSTRUCTION MANUAL
ELECTRICAL CHAPTER 2: INSTALLATION
measured by connecting the commons from phase A and C to the phase B input on the
PQM. This causes the phase A and phase C current to flow through the PQM’s phase B CT in
the opposite direction, producing a current equal to the actual phase B current.
I
a
+ I
b
+ I
c
= 0 for a three wire system.
I
b
= – (I
a
+ I
c
)
For the CT connections above, the
S2 SYSTEM SETUP \ CURRENT/
VOLTAGE CONFIGURATION \ PHASE CT WIRING \ PHASE CT PRIMARY
setpoint must be set to PHASE A, B, AND C.
FIGURE 2–10: Alternate Ct Connections for 3-wire System
NOTE
Courtesy of NationalSwitchgear.com
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