ABB REF615 Applications Manual page 225

1MRS756378 D
REF615
Application Manual
Example 1.
The sequence is implemented by two shots which have the same reclose time for all
protection functions, namely I>>, I> and I
activating the operate signals of the protection functions.
A070887 V1 EN
Figure 109: Auto-reclose sequence with two shots
t = Time delay of high-speed auto-reclosing, here:
HSAR
t = Time delay of delayed auto-reclosing, here:
DAR
t = Operating time for the protection stage to clear the fault
Protection
t = Operating time for opening the circuit breaker
CB_O
t = Operating time for closing the circuit breaker
CB_C
In this case, the sequence needs two CBBs. The reclosing times for shot 1 and shot
2 are different, but each protection function initiates the same sequence. The CBB
sequence is as follows:
A071270 V1 EN
Figure 110: Two shots with three initiation lines
Control functions
>. The initiation of the shots is done by
0
First reclose time
Second reclose time
Section 10
219