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Power Logger
Function Selection Buttons
31
Nominal Voltage
Select a nominal voltage from the list. If a voltage is not shown in the
list, enter a custom voltage. On energy studies, the nominal voltage is
required to determine the limits for dips, swells, and interruptions.
The nominal voltage on load studies is used to calculate the pseudo
apparent power:
nominal voltage x measured current
Set the nominal voltage to off if the apparent power readings are not
required.
Voltage Ratio (only in energy studies)
Configure a ratio factor for the voltage inputs when a potential
transformer (PT) is in series with the voltage connections such as
when you want to monitor a medium-voltage network. The default
value is 1:1.
Nominal Frequency
Set the nominal frequency to be the same as the power line
frequency, 50 Hz or 60 Hz.
Current Range
Configure the current range of the attached sensor. Three ranges are
available:
•
Auto
•
Low Range
•
High Range
When set to Auto, the current range is set automatically and depends
on the measured current.
Low Range is 1/10 of the nominal range of the attached current
sensor. For example, the low range of an iFlex1500-12 is 150 A.
High Range is the nominal range of the attached current sensor. For
example, 1500 A is the nominal range on an iFlex1500-12.
Note
Set the current range to Auto when you are not sure about
the maximum current during the logging session. A specific
application can require you to set the current range to a fixed
range rather than Auto. This can occur because the Auto
range is not gapless and may lose too much information in
the case of a highly fluctuating current.
Current Ratio
Configure a ratio factor for the current sensors when a current
transducer (CT) is used to measure the much higher level on the
primary side at a substation or step-down transformer that has a built-
in metering current transformer.
The current ratio can be used to increase the sensitivity of the iFlex
sensor. Wrap the iFlex sensor around the primary conductor, for
example 2X, and enter a ratio factor of 1:2 to get correct readings. The
default value is 1:1.
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