ABB RELION Series Technical Manual page 657

1MRS758755 A
REC615 and RER615
Technical Manual
A sequence initiation from the INIT_4 line leads to a lockout after two shots. In a
situation where the initiation is made from both the INIT_3 and INIT_4 lines, a
third shot is allowed, that is, CBB3 is allowed to start. This is called conditional
lockout. If the initiation is made from the INIT_2 and INIT_3 lines, an immediate
lockout occurs.
The INIT_5 line is used for blocking purposes. If the INIT_5 line is active during
a sequence start, the reclose attempt is blocked and the AR function goes to lockout.
If more than one CBBs are started with the shot pointer, the CBB with
the smallest individual number is always selected. For example, if the
INIT_2 and INIT_4 lines are active for the second shot, that is, the
shot pointer is 2, CBB2 is started instead of CBB5.
Even if the initiation signals are not received from the protection functions, the AR
function can be set to continue from the second to the fifth reclose shot. The AR
function can, for example, be requested to automatically continue with the sequence
when the circuit breaker fails to close when requested. In such a case, the AR function
issues a CLOSE_CB command. When the wait close time elapses, that is, the closing
of the circuit breaker fails, the next shot is automatically started. Another example is
the embedded generation on the power line, which can make the synchronism check
fail and prevent the reclosing. If the autoreclose sequence is continued to the second
shot, a successful synchronous reclosing is more likely than with the first shot, since
the second shot lasts longer than the first one.
Section 9
Control functions
651