ABB RELION REB500 Technical Manual page 76

Section 5
Bay protection functions
autoreclosure (200 ms) or not (10 s). For dead times longer than 10 s (autoreclosure function)
there is the possibility of using the blocking input Ext Blk SOTF. This is a binary input which is
interlocked by [P_SOTF_INIT] via an AND gate.
Combining undervoltage and a missing current enable signal [CREL_L1, L2, L3] as in alternative
3) prevents mal-operation of the logic after 200 ms, respectively 10 s, in cases of system faults
with low fault current contribution detected in the higher distance zones.
Resetting of the signal SOTF [START_SOTF] is delayed by 1 s, that is, every distance protection
start within a time of 1 s after one of the three switch-onto-fault criteria was fulfilled gives rise
to three-phase tripping [SOTF] of the circuit-breaker.
Uweak_L1
Uweak_L2
Uweak_L3T
CREL_L1
CREL_L2
CREL_L3
DeadLine
SOTF_10S
MANCL_DIST
SO TF_INI
IEC19000422 V1 EN-US
Figure 21:
Table 53:
Signal
Uweak_L1
Uweak_L2
Uweak_L3
CREL_L1
CREL_L2
CREL_L3
DeadLine
SOTF_10S
MANCL_DIST
Table continues on next page
70
AND
OR
SOFT segment
Signals SOFT (see above diagram)
In Out
X
X
X
X
X
X
X
X
X
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AND
10000
OR
AND
200
18000020-IEC19000422-1-en.vsdx
Source
Starter: UL1 < Umin
Starter: UL2 < Umin
Starter: UL3 < Umin
Starter: IL1 > Imin (current release)
Starter: IL2 > Imin (current release)
Starter: IL3 > Imin (current release)
Binary input: DeadLine
Setting: SOFT 10sec
(On=1 / Off=0)
Binary input: Manual Close
1MRK 505 406-UEN B
START_SOTF
1000
SOTF
AND
18000020-IEC19000425-1-en.vsdx
Drain
Bay protection functions REB500
Technical manual