1730
Users Manual
24
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.
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 also can be used to increase the
sensitivity of flexible current sensor: Wrap the iFlex sensor
around the primary conductor e.g. 2-times and enter a
ratio factor of 1:2 to get correct readings.
The default value is 1:1.
Connection Verification and Correction
Once the measurement is configured and the voltage and
current inputs are connected to the system under test, use
the Verify Connection touch button to confirm the
connection.
The verification detects:
• Too low signal
• Phase rotation for voltage and current
• Inverted current probes
• Wrong phase map
In the connection verification screen:
1. Push (Correct Digitally) to access the connection
correction screen. This screen allows you to virtually
swap phases and invert the current inputs instead of a
manual correction.
2. If the Logger is able to determine a better phase map
or polarity, push (Auto Correct) to apply the new
settings.
Auto Correct is not available if the algorithm is not able
to detect a better phase map or when no errors are
detected.
Note
It is impossible to detect all incorrect hook-ups
automatically. You must verify the suggested
modifications carefully before you apply the digital
correction.
The algorithm works in a way that creates in three phase
systems a sequence with a clockwise phase rotation.
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