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Users Manual
44
Glossary
Nominal Voltage. Select a nominal voltage from the list. If a voltage is not shown in the list,
enter a custom voltage. The nominal voltage is required to determine the limits for dips, swells,
and interruptions. When a voltage transducer is used, enter the nominal voltage on the primary
side of the transducer
Nominal Frequency. Set the nominal frequency to be the same as the power line frequency,
50 Hz or 60 Hz.
Voltage Ratio. 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.
Current Range. Configure the current range of the attached sensor:
High Range
High Range is the nominal range of the attached current sensor. For example, 1500 A is the
nominal range on an iFlex1500-24.
Low Range
Low Range is 1/10 of the nominal range of the attached current sensor. For example, the
low range of an iFlex1500-24 is 150 A.
Auto
When set to Auto, the current range is set automatically and depends on the measured
current.
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.
Use the current ratio 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 0.5:1 to get correct
readings. The default value is 1:1.
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