Power Logger
Function Selection Buttons
41
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 10.
hcf072.eps
Figure 10. 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 11.
The inrush current begins when the 1/2cycle RMS current
rises above the inrush threshold, and ends when the
1/2cycle RMS current is equal to or below the inrush
threshold minus the hysteresis value. In the event table the
extreme value is the highest 1/2cycle RMS value of the
event.
Duration
Nominal Voltage
Hysteresis
Threshold
0 Volt
Time Magnitude
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