ABB Relion 670 series, Technical Reference Manual

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PUDOG
AR1P1
AND
PUPSD
BLOCK
AND
0-tCS
AND
CSUR
CS
0-tBlkTr
AND
0-tTrip
CR
PLTR_CRD
OR
AND
BLKZMUR
TRIP
en06000236_ansi.en
0
0
0
ANSI06000236 V1 EN
Figure 189: Simplified logic diagram – power swing communication and tripping logic
The complete logic remains blocked as long as there is a logical one on the BLOCK
functional input signal. Presence of the logical one on the PUDOG functional input
signal also blocks the logic as long as this block is not released by the logical one on
the AR1P1 functional input signal. The functional output signal BLKZMUR remains
logical one as long as the function is not blocked externally (BLOCK is logical zero)
and the ground-fault is detected on protected line (PUDOG is logical one), which is
connected in three-phase mode (AR1P1 is logical zero). Timer
tBlkTr prolongs the
duration of this blocking condition, if the measured impedance remains within the
operate area of the Power Swing Detection (ZMRPSB, 68) function (PUPSD input
active). The BLKZMUR can be used to block the operation of the power-swing zones.
Logical one on functional input CSUR, which is normally connected to the TRIP
functional output of a power swing carrier sending zone, activates functional output
CS, if the function is not blocked by one of the above conditions. It also activates the
TRIP functional output.
Initiation of the CS functional output is possible only, if the PUPSD input has been
active longer than the time delay set on the security timer
tCS .
Simultaneous presence of the functional input signals CACC and CR (local trip
condition) also activates the TRIP functional output, if the function is not blocked by
one of the above conditions and the PUPSD signal has been present longer then the
time delay set on the trip timer
tTrip .
1MRK505222-UUS C
Section 6
Impedance protection
357
Technical reference manual