ABB REF 610 Technical Reference Manual page 30

REF 610
30
Feeder Protection Relay
Technical Reference Manual - ANSI Version
will issue a reclosing command to the circuit breaker. In addition, the set reset time
and set cutout time will pickup when the set open 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 reset 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 Diasable
CB Closed
Fig. 4.1.4.8.-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 pickup delay for the respective element. At the factory default delay of 300
s, the pickup signal will, in practise, not be used for shot initiation. External AR
initiation by the digital input signal is selected in SGB.
Note!
Shot initiation by a pickup signal applies only to shot 1 and definite tripping.
Note!
t
0
t
0
t
0
CB Closing Time
t
0
1MRS 755535
Shot Due
S
R
Close CB Command
S
R
CB Reclosing Failed