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Users Manual
52
An RVC Event is detected when the arithmetic mean of 100/120 URMS(1/2) values falls outside
the an RVC threshold. When a voltage change crosses the dip or swell thresholds, it is
considered a dip or swell and not a rapid voltage change. The event list shows the voltage step,
transition time, and Vmax. See Tab l e 1 2.
Parameters to configure:
Trigger on/off
Limit
The voltage Threshold limit value is defined as % of nominal voltage. The values is typically
in the range of 1 % to 6 %. The RVC hysteresis shall be less than the RVC threshold and is
typically 50 % of the RVC.
Waveform Deviation. The Waveform Deviation trigger monitors the differences in the
waveforms of consecutive voltage cycles. Each sample magnitude of the last cycle is
compared with the sample magnitude of the actual cycle. The trigger starts when the
difference exceeds the configured limit and ends when the difference is lower than the
threshold minus the hysteresis. If a waveform deviation triggers starts within one second after
the previous waveform deviation trigger ended, it is combined to one event.
Table 12. Rapid Voltage Change Characteristics
Voltage URMS
Voltage-to-steady-state logic
signal
Changes in voltage-to-steady-
state logic signal are disabled
RVC threshold
Arithmetic mean of the previous
100/200 URMS(%) values
Dip threshold
Steady-state
 100/200 URMS(%)
RVC event duration
RVC threshold with hysteresis
applied
URMS(%) values
ΔUss
ΔUMAX
Time
A
B
C
D
E
F
J
G
H
I
K
L
M
N
O
58


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