3-14 IM 760401-01E
Note
• You can use the scaling function to directly read the measured values on the display. For the
procedures, see section 4.5, “Setting the Scaling Constant when Using an External PT or CT.”
• Note that the frequency and phase characteristics of the PT or CT affect the measured data.
• For safety reasons, this section indicates wiring diagrams in which the common terminals (+/-
terminals) of the secondary side of the PT or CT are grounded.
• For the relationship between the wiring systems and the method of determining the measured
values or computed values, see page 16-6.
Wiring example of a three-phase, three-wire system (3P3W) when using a PT/CT... Can
be applied to models 760502, and 760503.
Source
L
l
CT PT
V
v
Load
L
l
CT PT
V
v
V(S)
W(T)
U(R)
Input terminal
(Element 1)
Input terminal
(Element 3)
C
±
±
V
C
±
±
V
Wiring example of a three-phase, four-wire system (3P4W) when using a PT/CT... Can
be applied to model 760503.
Source
Load
L
l
CT PT
V
v
L
l
CT
PT
V
v
L
l
CT
PT
V
v
V(S)
W(T)
U(R)
N
Input terminal
(Element 1)
Input terminal
(Element 2)
Input terminal
(Element 3)
C
±
±
V
C
±
±
V
C
±
±
V
Wiring example of a three-voltage, three-current system (3V3A) when using a PT/CT ...
Can be applied to model 760503.
Source Load
V(S)
W(T)
U(R)
L
l
CT
PT
V
v
L
l
CT
PT
V
v
L
l
CT
PT
V
v
Input terminal
(Element 1)
Input terminal
(Element 2)
Input terminal
(Element 3)
C
±
±
V
C
±
±
V
C
±
±
V
3.8 Using an External PT or CT to Wire the Circuit under Measurement
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