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Users Manual
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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 × 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.
Use (Show Menu) to navigate between the sub-
screens.
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.