ABB Relion 670 series - Blocking and Tripping Logic for Evolving Power Swings

protection to eliminate the initial fault and still make possible for the power swing zones
to operate for possible consecutive faults. A time delay between 150 and 300 ms is
generally sufficient.
8.15.3.2 Blocking and tripping logic for evolving power swings
The second part of a complete Power swing logic (PSLPSCH) functionality is a blocking
and tripping logic for evolving power swings, see figure
228 and figure 229. The
simplified logic is presented in figure 231. The logic controls the operation of the
underreaching distance protection zone (Zone 1) at power swings, caused by the faults and
their clearance on the adjacent power lines. The logic should generally be configured
between distance protection zones 1 and 2.
Configuration
The fault impedance should be detected within the external boundary of Power Swing
Detection (ZMRPSB, 68) function without power swing detected during the entire fault
duration. Configure for this reason the PUZMPSD to the functional output signal of
ZMRPSB (68) function, which indicates the measured impedance within its external
boundaries.
PUZMUR
BLOCK
AND
PUZMOR
PUZMPSD
PUPSD
0-tDZ
0-tZL
AND
OR
AND
AND
AND
-loop
OR
PUZMURPS
BLKZMOR
AND
en06000237_ansi.vsd
0
0
ANSI06000237 V1 EN
Figure 231: Blocking and tripping logic for evolving power swings
No system oscillation should be detected in power system. Configure for this reason the
PUPSD functional input to the PICKUP functional output of ZMRPSB (68) function or to
any binary input signal indicating the detected oscillations within the power system.
1MRK 506 369-UUS - Section 8
Impedance protection
Line distance protection REL670 2.2 ANSI 451
Application manual