EV/DV300 Series Power Meter
V:2.0 Revised October 2018
A fuse (1A) or circuit breaker should be used in
voltage input circuit. The wire number of voltage
input could be AWG16~22 or 0.6~1.5mm2
Note: The secondary of PT cannot be shorted, otherwise it may cause the severe damage
of the instrument. One end of the PT secondary should be connected to the earth. Please
refer to the wiring diagram.
Current Input
In a practical engineering application, CTs should be installed in the loop of measuring.
Normally the secondary of CT is 5A. 1A is possible in the ordering option. A CT of accuracy
over 0.5% (rating over 3VA) is recommended and it will influence the measuring accuracy.
The wire between CT and meter should be as shorter as possible. The length of the wire
may increase the error of the measurement.
The wire number of current input could be
AWG15~16 or 1.5~2.5 mm2.
Wiring of Un
Un is the reference point of electric potential for
measuring. Low resistance may increase the
measuring accuracy. Connecting point of Un has
relation with system wiring method. Please
referring to the wiring diagram.
Wiring of the meter
Wiring method of EV/DV300 series meter will be
introduced in the following paragraph. Please make
sure that the primary and secondary voltage and
current levels of PT and CT are suitable for the
meter. The correctness of measuring result
depends on the correct wiring and parameter
setting of the meter.
NOTE
The CT loop should not be
open circuit in any
circumstance when the power
is on. There should not be any
fuse or switch in the CT loop
and one end of the CT loop
should be connected to the
ground.
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