ABB ret650 - Page 189

AND
AND
AND
AND
AND
OR
OR
OR
a
b
a>b
AND
a
b
a>b
I>BlkCont
AND
Time out L1
BFP Started L1
Reset L1
CBCLDL1
Current High L1
Contact Closed L1
IEC09000977-2-en.vsd
FunctionMode
OR
OR
Current
Contact
Current and Contact
1
IP>
CB Closed L1
IL1
IEC09000977 V2 EN
Figure 80: Simplified logic scheme of the CCRBRF, CB position evaluation
t
t1
200 ms
AND
AND
OR
OR
OR
TRRETL3
TRRETL2
BFP Started L1
Retrip Time Out L1
CB Closed L1
TRRET
CB Pos Check
No CBPos Check
OR
From other
phases
IEC16000502-1-en.vsd
RetripMode
1
30 ms
IEC16000502 V1 EN
Figure 81: Simplified logic scheme of the retrip logic function
1MRK 504 135-UEN A Section 8
Current protection
183
Technical manual