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Fluke 433/434
Users Manual
During an Interruption the voltage sinks well below its nominal value. In three phase
systems an interruption begins when the voltage on all phases are below threshold and
ends when one phase is equal to or above the interruption threshold plus hysteresis. The
trigger conditions for interruptions are threshold and hysteresis. Interruptions are
characterized by duration, magnitude and time of occurrence. Figure 9-3 explains this.
INTERRUPTION-INT-
NOMINAL
VOLTAGE
HYSTERESIS
THRESHOLD
Rapid voltage changes are quick transitions of the RMS voltage between two steady-
states. Rapid voltage changes are captured based on steady voltage tolerance, steady time,
minimum step detected, and minimum rate (%/s). Figure 9-4 explains this.
9-2
Figure 9-2. Characteristics of a voltage swell
0 VOLT
Figure 9-3. Characteristics of a voltage interruption
duration
magnitude
time
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