ABB REF 610 - Page 37

37
If the network fault has still not been cleared, i.e. all selected auto-reclose shots have
been unsuccessful, and the protection trips the circuit breaker before expiration of
the set reclaim time, the AR function will generate a definite trip alarm. The circuit
breaker will now remain open and the AR function will be locked out.
As default, the AR function is not in use (number of auto-reclose shots = 0). The AR
function can be activated either via the HMI or with SPA parameter S25 by setting
the number of auto-reclose shots to 1, 2 or 3.
t
t
t
t
OR
Shot 1
Shot 2
Shot 3
AND
CB Close Inhibit
OR
S
R
Shot Due
Close CB Command
Shot Initiation
AND
S
R
OR
CB position closed
CB Reclosing Failed
Dead time
CB closing time
A040317
Fig. 5.1.4.8.-1 Simplified shot logic diagr am
Shot initiation
The AR function can be initiated by any of the following signals:
*
External AR initiation signal
*
Start signal from stages I> and I
0
>
*
Trip signal from stages I>, I>>, I
0
> and I
0
>>
The start signal from stages I>, and I
0
> will initiate a shot on expiration of a settable
start delay for the respective stage. At the factory default delay of 300 s, the start
signal will, in practise, not be used for shot initiation. External AR initiation by the
digital input signal is selected in SGB.
Shot initiation by a start signal applies only to shot 1 and definite
tripping.
The AR function will issue an opening command to the circuit breaker
at shot initiation by a start or a trip signal.
Feeder Protection Relay
Technical Reference Manual
REF 610REF 610
1MRS755310