Shot Initiation; Simplified Shot Logic Diagram - ABB REF610 Technical Reference Manual

REF610 REF610
40
Feeder Protection Relay
Technical Reference Manual - ANSI Version
set dead time for shot 3 will start. When the set dead time elapses, the blocking of
selected protection elements (the same as for shot 2) will be activated and the AR
function will issue a reclosing command to the circuit breaker. In addition, the set
reclaim time and set cutout time will start when the set dead time elapses. The
blocking of protection elements will be reset on expiration of the set cutout time.
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.
Shot 1

Shot Initiation

Shot 2
Shot 3
CB Close Disable
CB Closed
CB Closing Time
Fig. 5.1.4.8.-1

Simplified shot logic diagram

Shot initiation
The AR function can be initiated by any of the following signals:
External AR initiation signal
*
Pickup signal from elements 51P and 51N
*
Trip signal from elements 51P, 50P-1, 51N and 50N
*
The pickup signal from elements 51P, and 51N will initiate a shot on expiration of a
settable start delay for the respective element. At the factory default delay of 300 s,
the pickup signal will, in practice, not be used for shot initiation. External AR
initiation by the digital input signal is selected in SGB.
t
0
t
0
t
0
t
0
1MRS755535
Shot Due
S
R
Close CB Command
S
R
CB Reclosing Failed
A060584