the entered VVa x time 2 is rejected. If VVa x time 3 is set lower than VVa x time 2, the
entered VVa x time 3 is rejected.
10.3.4.4 Duration measurement
The duration of each voltage phase corresponds to the period during which the measured
TRMS values remain above (swell) or below (dip, interruption) the corresponding limit.
Besides the three limit settings for the variation types dip and swell, there is also a specific
duration setting for each limit setting. For interruption, there is only one limit setting
common for the three duration settings. The maximum duration setting is common for all
variation types.
The duration measurement module measures the voltage variation duration of each phase
voltage separately when the Phase mode setting is "Single Phase". The phase variation
durations are independent. However, when the Phase mode setting is "Three Phase",
voltage variation may pick up only when all the monitored phases are active. An example
of variation duration when Phase mode is "Single Phase" can be seen in Figure 535. The
voltage variation in the example is detected as an interruption for the phase B and a dip for
the phase A, and also the variation durations are interpreted as independent V_B and V_A
durations. In case of single-phase interruption, the DIPST output is active when either
PICKUP_A or PICKUP_B is active. The measured variation durations are the times
measured between the activation of the PICKUP_A or PICKUP_B outputs and
deactivation of the PICKUP_A or PICKUP_B outputs. When the Phase mode setting is
"Three Phase", the example case does not result in any activation.
V_A
V_C
V_B
V_A duration
V_B duration
Voltage dip set
Voltage swell set
Voltage Int set
Total variation duration
GUID-922C1D16-46ED-4825-8C9A-4750CCB0B778-ANSI V2 EN
Figure 535: Single-phase interruption for the Phase mode value "Single Phase"
Section 10 1MAC059074-MB A
Power quality measurement functions
1048 615 series ANSI
Technical Manual
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