12.2.2.1
Auto reclosing operation Off and On
M12391-91 v6
Operation of the automatic recloser can be set to Off and On by a setting parameter
or by external control. The setting parameter
Operation
=
Off
, or
On
sets the
function to Off or On. With the settings
Operation
=
On
and
ExternalCtrl
=
On
,
the control is made by input signal pulses to the inputs On and Off, for example,
from a control system or by a control switch.
When the auto recloser is set On, the
SETON
output is set, and the auto recloser
becomes operative if other conditions such as circuit breaker is closed and circuit
breaker is ready are also fulfilled, the
READY
output is activated (high). Then the
auto recloser is ready to accept a start.
12.2.2.2
Start auto reclosing and conditions for start of a reclosing cycle
M12391-94 v5
The usual way to start an auto reclosing cycle, or sequence, is to start it at selective
tripping by line protection by applying a signal to the
START
input. 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
earth fault protection aided trip can be connected to start an auto reclose attempt. If
general trip is used to start the auto recloser it is important to block it from other
functions that should not start an auto reclosing sequence.
In cases where one wants to differentiate auto reclosing dead time, for different
power system configuration or at tripping by different protection stages, one can
also use the
STARTHS
input (start high-speed reclosing). When initiating
STARTHS
, the auto reclosing dead time for high-speed shot 1,
t1_HS
is used and
the closing is done without checking the synchrocheck condition.
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:
•
CBREADY
, circuit breaker ready for a reclosing cycle, for example, charged
operating gear.
•
CBCLOSED
to ensure that the circuit breaker was closed when the line fault
occurred and start was applied.
•
No signal at
INHIBIT
input that is, no blocking or inhibit signal present. After
the start has been accepted, it is latched in and an internal signal “start” is set.
It can be interrupted by certain events, like an “inhibit” signal.
12.2.2.3
Start auto reclosing from circuit breaker open information
M12391-100 v6
If a user wants to initiate auto reclosing from the circuit breaker open position
instead of from protection trip signals, the function offers such a possibility. This
starting mode is selected with the setting parameter
StartByCBOpen
=
On
. Typically
a circuit breaker auxiliary contact of type NO (normally open) is connected to
CBCLOSED
and
START
. When the signal changes from circuit breaker closed to
Section 12
1MRK 506 375-UEN A
Control
226
Railway application RER670 2.2 IEC
Application manual
Summary of Contents for RELION RER670
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