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Connection to Circuits
3-Phase Measurement (W3) 5
5-15
Measurement with Voltage and Current Transducer
Figure 5-10 illustrates the connections for a 3-phase measurement with a voltage and
current transducer. In 4-wire power systems, the common (N) of the 3 voltage
transducers is connected to the neutral line. In 3-wire power systems, the common (N) of
the 3 voltage transducers is left open to create a star point. Alternately, you can connect
to the star point of a wye-connected load or to earth if the internal star point of the power
system in connected to earth.
W Caution
To prevent damage to the transducer due to overload, check
the transducer rating.
Note
Transducer errors limit the measuring bandwidth and reduce the intrinsic
uncertainty.
XW Warning
To avoid possible electric shock or personal injury:
• Risk of injury when touching connections, internal circuits
and measuring devices that are not connected to earth
ground.
• Always adhere to the instructions regarding the sequence of
connection (see Chapter 5, “Connecting Sequence”).
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