ABB RELION 650 SERIES, Technical Manual

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has been activated (even if only for a short time), it prevents sending of a
communication signal and tripping through the scheme communication logic after
a settable time
tPickUpRev . The prevention will last for tPickUpRev + 10 ms +
tDelayRev after the IREV reset. This makes it possible for the receive signal to
reset before the carrier-aided trip signal is activated due to the current reversal by
the forward directed zone. The logic diagram for current reversal is shown in
Figure
225 .
t
10 ms
t
tPickUpRev
t
tPickUpRev
BLOCK
IRVBLK
IRV
CurrRev = On
t
tDelayRev
IRVL
IEC05000122-4-en.vsd
AND
IEC05000122 V4 EN-US
Figure 225: Simplified logic diagram for current reversal
By connecting the output signal IRVL to input BLKCS in the ZCPSCH function,
the sending of the signal CS from the overreaching zone connected to CSOR in
ZCPSCH will be blocked. By connecting IRVL to input BLKTR in the ZCPSCH
function, the TRIP output from the ZCPSCH function will be blocked.
The function has an internal 10 ms drop-off timer which secure that the current
reversal logic will be activated for short input signals even if the pick-up timer is
set to zero.
12.2.6.2 Weak-end infeed logic
M16679-8 v11
The weak-end infeed logic (WEI) function sends back (echoes) the received signal
under the condition that no fault has been detected on the weak-end by different
fault detection elements (distance protection in forward or reverse direction).
The WEI function returns the received signal, shown in Figure 226 , when:
• The setting parameter WEI is set to either Echo or Echo & Trip .
• No active signal present on the input BLOCK.
• The functional input CRL is active for a time longer than the tPickUpWei
setting. This input is usually connected to the CRL output on the scheme
communication logic ZCPSCH.
• The WEI function is not blocked by the active signal connected to the
WEIBLK1 functional input or to the VTSZ functional input. The later is
usually configured to the VTSZ functional output of the fuse-failure function.
• No active signal has been present for at least 200 ms on the WEIBLK2
functional input. An OR combination of all fault detection functions (not
undervoltage) as present within the IED is usually used for this purpose.
• The weak-end infeed logic also echoes the received permissive signal when
local breaker opens, CBOPEN prior to faults appeared at the end of line.
Section 12
1MRK 506 382-UEN A
Scheme communication
444 Line distance protection REL650 2.2 IEC
Technical manual