Fluke 434 User Manual download pdf (Page 38)

Fluke 433/434

Users Manual

9-2

Figure 9-2. Characteristics of a voltage swell

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.

duration

time

magnitude

NOMINAL

VOLTAGE

INTERRUPTION-INT-

HYSTERESIS

0 VOLT

THRESHOLD

Figure 9-3. Characteristics of a voltage interruption

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.

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 121 122

No comments

Fluke 434 User Manual Page 38