Functions
2.6 Power Swing Detection (optional)
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
185
Figure 2-81 Detection of instable power swings
As the operating range of the power swing supplement depends on the distance protection settings, the power
swing tripping
can only be active when the distance protection has been activated.
2.6.3 Setting Notes
The power swing supplement is only active if it has been set to Power Swing = Enabled (address 120) during
the configuration.
The 4 possible programs may be set in address 2002 P/S Op. mode, as described in Section 2.6: All zones
block, Z1/Z1B block, >= Z2 block or Z1,Z1B,Z2 block.
Additionally the tripping function for unstable power swings (asynchronism) can be set with parameter
PowerSwing trip (address 2006), which should be set to YES if required (presetting is NO). In the event of
power swing tripping
it is sensible to set P/S Op. mode = All zones block for the power swing blocking
to avoid premature tripping by the distance protection.
Note
The power swing supplement works together with the impedance pickup and is only available in this combina-
tion.
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