ABB REF615 - Page 225

Example 1.
The sequence is implemented by two shots which have the same reclose time for all
protection functions, namely I>>, I> and I
0
>. The initiation of the shots is done by
activating the operate signals of the protection functions.
A070887 V1 EN
Figure 109: Auto-reclose sequence with two shots
t
HSAR
=
Time delay of high-speed auto-reclosing, here: First reclose time
t
DAR
= Time delay of delayed auto-reclosing, here: Second reclose time
t
Protection
= Operating time for the 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 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
1MRS756378 D Section 10
Control functions
REF615 219
Application Manual