UMG 96-PA
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48
Voltage and current input monitoring in
pointer diagrams:
The phasor diagram can be used to check
for incorrect connections to the voltage and
current inputs.
Example 1
Primarily Ohmic load.
Voltage
and
Current
only
have minor difference
in the phase.
• The current measurement input is assigned
to the correct voltage measurement input.
Example 2
Primarily Ohmic load.
Voltage
and
Current
only
have a difference of about
180° in the phase.
• The measurement current input is assigned
to the correct voltage measurement input.
• In the present current measurement, the
connections k and I are switched or energy
is being fed back into the supply network.
13. 5
Measurement current
The device:
• is designed to be connected to current
transformers with secondary currents of
../1 A and ../5 A.
• does not measure direct currents.
• has current measurement inputs that can
be loaded with 60 A (sinusoidal) for 1
second.
The factory preset current transformer ratio
is 5/5 A, and may need to be adjusted to the
current transformer in use.
1. Short-circuit all of the current transformer
outputs except for one.
2. Compare the current indicated on the de-
vice with the attached input current.
• The currents must match when the current
transformer conversion ratio is accounted
for.
• The device must show approx. zero am-
peres in the short-circuited current mea-
surement inputs.
Fig. phasor diagram
C
ATTENTION!
Voltages and currents outside of the
admissible measurement range can
destroy the device.
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