ABB Relion 670 series - Power Swing Logic PSLPSCH; Identification; Application

to continuous swinging. Consider the minimum possible speed of power swinging in a
particular system.
The tR1 inhibit timer delays the influence of the detected residual current on the inhibit
criteria for ZMRPSB(68). It prevents operation of the function for short transients in the
residual current measured by the IED.
The tR2 inhibit timer disables the output PICKUP signal from ZMRPSB (68) function, if
the measured impedance remains within ZMRPSB (68) operating area for a time longer
than the set tR2 value. This time delay was usually set to approximately two seconds in
older power-swing devices.
The setting of the tGF 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
8.15.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Power swing logic PSLPSCH - -
8.15.2 Application
Power Swing Logic (PSLPSCH) is a complementary function to Power Swing Detection
(ZMRPSB, 68) 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 (68)
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
Section 8 1MRK 506 369-UUS -
Impedance protection
444 Line distance protection REL670 2.2 ANSI
Application manual