ABB Relion 670 Series Technical Reference Manual page 465

1MRK505222-UUS C
Technical reference manual
BFP Started A Retrip Time Out A
t1
0
RetripMode
No CBPos Check
1
CB Pos Check
CB Closed A
52FAIL
ANSI09000978 V4 EN
Figure 229: Simplified logic scheme of the retrip logic function
BFP Started A
BFP Started B
AND
BFP Started C
IN
a
a>b
Pickup_N
b
BUTripMode
2 out of 4
1 out of 4
1
1 out of 3
Current High B
From other
Current High C
phases
Current High A
52FAIL
AND
BFP Started A t2
OR
BFP Started B
From other
2 of 3
phases BFP Started C
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.
From other
phases
AND
OR
OR
AND
AND
Contact Closed A
OR
OR
AND
0
AND
AND
OR
Backup Trip B
From other
phases
Backup Trip C
S
Q
SR
R
AND
Section 7
Current protection
TRRET_C
TRRET_B
OR
tPulse
OR
AND
ANSI09000978-4-en.vsd
Backup Trip A
AND
OR
t2MPh
0
tPulse
OR
OR
tPulse
t3 OR
0
ANSI09000979-4-en.vsd
TRRET
TRRET_A
TRBU
TRBU2
459