t
t1
tPulse
AND
AND
OR
OR
OR
TRRETL3
TRRETL2
BFP Started L1
Retrip Time Out L1
CB Closed L1
TRRET
TRRETL1
CBFLT
CB Pos Check
No CBPos Check
AND
OR
From other
phases
IEC09000978-3-en.vsd
RetripMode
1
IEC09000978 V3 EN
Figure 187:
Simplified logic scheme of the retrip logic function
IEC09000979-3-en.vsd
BFP Started L1
t
t2
AND
2 of 3
BFP Started L2
BFP Started L3
From other
phases
OR
OR
AND
t
t2MPh
CBFLT
AND
AND
a
b
a>b
IN
IN>
1 out of 4
AND
OR
1 out of 3
Current High L2
Current High L3
From other
phases
AND
Current High L1
OR
Contact Closed L1
OR
Backup Trip L1
tPulse
Backup Trip L2
OR
From other
phases
Backup Trip L3
TRBU
OR
S
R
SR
Q
AND
t
t3
tPulse
TRBU2
OR
2 out of 4
BUTripMode
1
BFP Started L1
AND
BFP Started L2
BFP Started L3
IEC09000979 V3 EN
Figure 188:
Simplified logic scheme of the back-up trip logic function
Internal logical signals Current High L1, Current High L2, Current High L3 have
logical value 1 when current in respective phase has magnitude larger than setting
parameter
IP>
.
Section 8
1MRK502052-UEN B
Current protection
412
Technical manual
Summary of Contents for Relion REG670
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