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Section 7
Current protection
116
IP>
FunctionMode
1
Current and Contact
IL1
BFP Started L1
I>BlkCont
CBCLDL1
IEC09000977 V2 EN
Figure 47:
Simplified logic scheme of the CCRBRF, CB position evaluation
t1
BFP Started L1
Retrip Time Out L1
t
RetripMode
30 ms
1
CB Pos Check
CB Closed L1
IEC16000502 V1 EN
Figure 48:
Simplified logic scheme of the retrip logic function
a
a>b
b
Current
O R
Contact
OR
AND
a
AND
a>b
OR
b
From other
AND
No CBPos Check
OR
OR
AND
1MRK 505 288-UEN A
AND
OR
Time out L1
AND
Current High L1
OR
AND
AND
Contact Closed L1
AND
IEC09000977-2-en.vsd
TRRETL3
TRRETL2
phases
OR
200 ms
OR
Technical manual
Reset L1
CB Closed L1
TRRET
IEC16000502-1-en.vsd
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