ABB Relion 670 series - Page 465

tPulse
AND
AND
OR
OR
OR
TRRET_C
TRRET_B
BFP Started A
Retrip Time Out A
CB Closed A
TRRET
TRRET_A
52FAIL
CB Pos Check
No CBPos Check
AND
OR
From other
phases
ANSI09000978-4-en.vsd
RetripMode
1
0
t1
ANSI09000978 V4 EN
Figure 229: Simplified logic scheme of the retrip logic function
ANSI09000979-4-en.vsd
BFP Started A
AND
2 of 3
BFP Started B
BFP Started C
From other
phases
OR
OR
AND
52FAIL
AND
AND
a
b
a>b
IN
1 out of 4
OR
1 out of 3
Current High B
Current High C
From other
phases
AND
Current High A
OR
Contact Closed A
OR
Backup Trip A
tPulse
Backup Trip B
OR
From other
phases
Backup Trip C
TRBU
OR
S
R
SR
Q
AND
tPulse
TRBU2
OR
2 out of 4
BUTripMode
1
Pickup_N
AND
BFP Started A
AND
BFP Started B
BFP Started C
0
t2
0
t2MPh
0
t3
ANSI09000979 V4 EN
Figure 230: Simplified logic scheme of the back-up trip logic function
Internal logical signals PU_A, PU_B, PU_C have logical value 1 when current in
respective phase has magnitude larger than setting parameter Pickup_PH.
1MRK505222-UUS C Section 7
Current protection
459
Technical reference manual