The setting of the tEF timer must cover, with sufficient margin, the opening time of
a circuit breaker and the dead-time of a single-phase autoreclosing together with
the breaker closing time.
8.15 Power swing logic PSLPSCH
SEMOD153597-1 v3
8.15.1 Identification
SEMOD175682-2 v3
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Power swing logic PSLPSCH - -
8.15.2 Application
SEMOD131359-4 v3
Power Swing Logic (PSLPSCH) is a complementary function to Power Swing
Detection (ZMRPSB) function. It enables a reliable fault clearing for different
faults on protected lines during power swings in power systems.
It is a general goal, to secure fast and selective operation of the distance protection
scheme for the faults, which occur on power lines during power swings. It is
possible to distinguish between the following main cases:
• A fault occurs on a so far healthy power line, over which the power swing has
been detected and the fast distance protection zone has been blocked by
ZMRPSB element.
• The power swing occurs over two phases of a protected line during the dead
time of a singlepole auto-reclosing after the Ph-E fault has been correctly
cleared by the distance protection. The second fault can, but does not need to,
occur within this time interval.
• Fault on an adjacent line (behind the B substation, see figure
226) causes the
measured impedance to enter the operate area of ZMRPSB function and, for
example, the zone 2 operating characteristic (see figure 227). Correct fault
clearance initiates an evolving power swing so that the locus of the measured
impedance continues through zone 1 operating characteristic and causes its
unwanted operation, if no preventive measures have been taken, see figure
227.
Section 8 1MRK 506 369-UEN B
Impedance protection
416 Line distance protection REL670 2.2 IEC
Application manual
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