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Users Manual
50
Voltage Swells. On single-phase systems, a swell begins when the voltage rises above the
swell threshold, and ends when the voltage is equal to or below the swell threshold minus the
hysteresis voltage. See Table 10.
On polyphase systems, a swell begins when the voltage of one or more channels is above the
swell threshold and ends when the voltage on all measured channels is equal to or below the
swell threshold minus the hysteresis voltage.
Choose nominal or sliding reference voltage. A sliding reference voltage uses measured
values filtered with a 1-minute time constant and applies usually only for medium and high
voltage systems.
Parameters to configure:
Limit
The threshold limit value is defined as % of nominal voltage or sliding reference. The
default value is 110 % and the hysteresis is 2 %.
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 Table 11 .
Table 10. Characteristics of a Voltage Swell
Threshold
Hysteresis
Reference Voltage
Time
Magnitude
Duration
Table 11. Characteristics of a Voltage Interruption
Nominal Voltage
Hysteresis
Threshold
Time
Duration
Magnitude
0 Volt
A
B
C
D
E
F
E
A
B
C
G
DF
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