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Protection and Automation Functions
7.23 Phase-Sequence Switchover
[dwphrpsys1-151013, 1, en_US]
Figure 7-178
Changing Over the Phase Sequence per Measuring Point
A switchover of the phase sequence per measuring point can also be necessary for operational reasons. This
switchover enables proper behavior of the protection equipment, for example at the transition from generator
operation to motor operation (pump operation).
The following example shows an application in a pumped storage plant. The switchover of the phase
sequence (change in rotational direction) realizes the transition there from generator operation to motor oper-
ation. Which phases and measuring points are changed over depends on the conditions in the system.
[dwphrapp-240211-01.tif, 2, en_US]
Figure 7-179
The example shows 2 differential protection devices (IED1 and IED2) and an impedance protection (IED3) with
the connected measuring points.
The phase sequence is insignificant for the differential protection of IED1, as the protected object is not
affected by the switchover option of the phase sequence.
The phase sequence is also relevant to the differential protection of IED2, as the protected object extends
beyond the switchover option.
The phase sequence is also relevant to the impedance protection (IED3). Depending on the switch position,
the voltage measured values 1 and the current measured values 3 have a different phase sequence.
864
Phase Sequence Switchover
Application Example for Phase-Rotation Reversal in a Pump Station
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
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