ABB RELION 620 Series Technical Manual page 691

1MAC504801-IB E
620 series ANSI
Technical Manual
GUID-0657A163-7D42-4543-8EC8-3DF84E2F0BF5-ANSI V1 EN
Figure 347: Concurrent dip and swell when Phase mode is "Single Phase"
In Figure 348, one phase is in dip and two phases have a swell indication. For the Phase
Mode Dip value "Three Phase", the activation occurs only when all the phases are active.
Furthermore, both swell and dip variation event detections take place simultaneously. In
case of a concurrent voltage dip and voltage swell, both SWELLCNT and DIPCNT are
incremented by one.
Also Figure 348 shows that for the Phase Mode value "Three Phase", two different time
moment variation event swell detections take place and, consequently, DIPCNT is
incremented by one but SWELLCNT is totally incremented by two. Both in
and Figure 348 it is assumed that variation durations are sufficient for detections to take
place.
Power quality measurement functions
Section 8
Figure 347
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