Information On The Circuit-Breaker Position; Circuit-Breaker Closing; Blocking Of Protection Elements - ABB REF610 Technical Reference Manual

1MRS755535
Feeder Protection Relay
Technical Reference Manual - ANSI Version

Information on the circuit-breaker position

The AR function requires information on the circuit-breaker position. Any digital
input can be selected for the information on the circuit breaker being open (CB
Position Open) and closed (CB Position Closed) in SGB. Normally, two
digital inputs is recommended although either one is enough for the AR function.
Information on the circuit-breaker position is used in the following situations:
At manual circuit-breaker closing, the AR function will be disabled for the
*
reclaim time.
At manual circuit-breaker closing during an ongoing shot, the shot will be
*
interrupted and the AR function disabled during the reclaim time.
Shot initiation is allowed only when the circuit breaker is closed.
*
Reclosing of the circuit breaker is ended immediately after the AR function has
*
received information that the circuit breaker has been closed.

Circuit-breaker closing

When the set dead time elapses, the AR function will issue a reclosing command to
the circuit breaker (Close CB Command). Reclosing can be disabled via a digital
input (CB Close Disable). External disable of reclosing by the digital input
signal is selected in SGB.
When reclosing is disabled, or the circuit breaker does not close before expiration of
the set CB closing time, the circuit breaker will remain open and the AR function
will generate a CB Reclosing Failed signal.
Reclosing is disabled and the CB Reclosing Failed signal generated also if an
AR initiation signal is active, i.e. the fault has not been cleared, when reclosing
begins.
The duration of the reclosing command is settable (CB closing time). However,
reclosing of the circuit breaker will end immediately after the AR function has
received information that the circuit breaker has been closed, or if a protection trips
the circuit breaker again.

Blocking of protection elements

In several applications, such as fuse-saving (refer to 6.1.1. Fast tripping and
initiation of shot 1 using two protection elements), the aim is at fast tripping and
initiation of shot 1 and delayed tripping and initiation of shot 2 and 3. Consequently,
if two protection element elements are used, one fast and the other one delayed, the
fast element should be set to be blocked by the AR function during shot 2 and 3.
The protection elements can be set to be blocked at shot 1 and/or shot 2 and 3. The
selection is made in SG2 (see Table 5.1.4.10.-11).
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