Example 1.
The sequence is implemented by two shots which have the same reclosing time for all
protection functions, namely I>>, I> and Io>. The initiation of the shots is done by
activating the operating signals of the protection functions.
A070887 V1 EN
Figure 343: Autoreclosing sequence with two shots
t
HSAR
Time delay of high-speed autoreclosing, here:
First reclose time
t
DAR
Time delay of delayed autoreclosing, 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 described in Table
664 as follows:
Shot 1
(CBB1)
0.3s
Shot 2
(CBB2)
15.0s
INIT_1 (I>>)
INIT_2 (I>)
INIT_3 (Io>)
Lockout
Lockout
Lockout
A071270 V2 EN
Figure 344: Two shots with three initiation lines
1MRS758755 A Section 9
Control functions
REC615 and RER615 655
Technical Manual
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