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1736/1738
Users Manual
46
Supply Voltage Interruptions
On single-phase systems, a voltage interruption begins when the
voltage falls below the voltage interruption threshold and ends when
the value is equal to or greater than the voltage interruption threshold
plus the hysteresis. See Figure 9.
Figure 9. Characteristics of a Voltage Interruption
On polyphase systems, a voltage interruption begins when the
voltages of all channels fall below the voltage interruption threshold
and ends when the voltage on any one channel is equal to, or greater
than, the voltage interruption threshold plus the hysteresis.
Note
On polyphase systems, the event is still classified as a dip
when the voltage of only one or two phases falls below the
interruption limit.
Inrush Current
Inrush currents are surge currents that occur when a large, or low-
impedance load comes on line. Normally the current will stabilize after
some time when the load has reached normal working condition. For
example the start-up current in induction motors can be 10x the
normal working current. See Figure 10.
The inrush current begins when the 1/2-cycle RMS current rises
above the inrush threshold, and ends when the 1/2-cycle RMS current
is equal to or below the inrush threshold minus the hysteresis value. In
the event table the extreme value is the highest 1/2-cycle RMS value
of the event.
Figure 10. Inrush Characteristics and Relation with Start Menu
Details
The details screen provides an overview of the logging setup. During
an active session or when reviewing an already completed session,
you can modify the description and the cost/kWh with the Edit Setup
touch target.
Push View Configuration to review the measurement configuration
for the logging session.
Duration
Nominal Voltage
Hysteresis
Threshold
0 Volt
Time Magnitude
Threshold
(=Trigger)
Hysteresis
}
Duration
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