ABB REL650 series, Applications Manual

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Auto-Reclosing onto a permanent fault, one can arrange to combine Auto-Reclosing with
a synchronism check on line terminals close to such power stations and attempt energizing
from the side furthest away from the power station and perform the synchronism check at
the local end if the energizing was successful.
Transmission protection systems are usually sub-divided and provided with two
redundant protection IEDs. In such systems it is common to provide auto-reclosing in only
one of the sub-systems as the requirement is for fault clearance and a failure to reclose
because of the auto-recloser being out of service is not considered a major disturbance. If
two auto-reclosers are provided on the same breaker, the application must be carefully
checked and normally one must be the master and be connected to inhibit the other auto-
recloser if it has started. This inhibit can for example be done from Autorecloser for 3-
phase operation(SMBRREC ,79) In progress.
A permanent fault will cause the line protection to trip again when it recloses in an attempt
to clear the fault.
The auto-reclosing function allows a number of parameters to be adjusted.
Examples:
• number of auto-reclosing shots
• auto-reclosing open times (dead time) for each shot
11.2.2.1 Auto-reclosing operation OFF and ON
Operation of the automatic reclosing can be set OFF and ON by a setting parameter and
by external control. Parameter
Operation = Disabled , or Enabled sets the function OFF
and ON. In setting Operation = ExternalCtrl , OFF and ON control is made by input signal
pulses, for example, from the control system or from the binary input (and other systems).
When the function is set ON and operative (other conditions such as CB closed and CB
Ready are also fulfilled), the output SETON is activated (high). When the function is
ready to accept a reclosing start.
11.2.2.2 Initiate auto-reclosing and conditions for initiation of a reclosing cycle
The usual way to start a reclosing cycle, or sequence, is to start it at tripping by line
protection by applying a signal to the input RI. Starting signals can be either, General Trip
signals or, only the conditions for Differential, Distance protection Zone 1 and Distance
protection Aided trip. In some cases also Directional Ground fault function Aided trip can
be connected to start an Auto-Reclose attempt.
A number of conditions need to be fulfilled for the start to be accepted and a new auto-
reclosing cycle to be started. They are linked to dedicated inputs. The inputs are:
Section 11
1MRK 506 334-UUS A
Control
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Application manual