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1MAC050144-MB C
Section 7
Control functions
615 series ANSI
507
Technical Manual
CBB2 and meant to be the first shot of the autoreclose sequence initiated by the low stage
of the overcurrent protection (51P) and the low stage of the non-directional ground-fault
protection (51N/G). It has the same reclose time in both situations. It is set as a high-speed
autoreclosing for corresponding faults. The third shot, which is the second shot in the
autoreclose sequence initiated by 51P or 51N/G, is set as a delayed autoreclosing and
executed after an unsuccessful high-speed autoreclosing of a corresponding sequence.
Figure 277:
Autoreclose sequence with two shots with different shot settings
according to initiation signal
t
HSAR
Time delay of high-speed autoreclosing, here:
First reclose time
t
DAR
Time delay of delayed autoreclosing, here:
Second reclose time
t
l>>
Operating time for the 50P-1 protection stage to clear the fault
t
l>
or
lo>
Operating time for the 51P or 51N/G protection stage to clear the fault
t
CB_O
Operating time for opening the circuit breaker
t
CB_C
Operating time for closing the circuit breaker
In this case, the number of needed CBBs is three, that is, the first shot's reclosing time
depends on the initiation signal. The CBB sequence is as follows:
HSAR
=
CBB2
DAR
=
CBB3
t
CB_O
t
HSAR
t
51P or 51N/G
t
DAR
t
CB_C
t
CB_O
t
CB_C
t
CB_O
HSAR
=
CBB1
CB
Position
t
CB_O
t
HSAR
t
CB_C
t
CB_O
t
50P-1
50P-1
51P,
51N/G
t
50P-1
t
51P or 51N/G
t
51P or 51N/G
Fault occurs
Summary of Contents for 615 Series ANSI
Page 1: ...Relion Protection and Control 615 series ANSI Technical Manual ...
Page 2: ......
Page 29: ...1MAC050144 MB C Section 615 series ANSI 22 Technical Manual ...
Page 389: ...Section 4 1MAC050144 MB C Protection functions 382 615 series ANSI Technical Manual ...
Page 485: ...Section 6 1MAC050144 MB C Supervision functions 478 615 series ANSI Technical Manual ...
Page 635: ...Section 10 1MAC050144 MB C Other functions 628 615 series ANSI Technical Manual ...
Page 711: ...Section 16 1MAC050144 MB C Glossary 704 615 series ANSI Technical Manual ...
Page 712: ......