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
10.2.2.1
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.
10.2.2.2
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:
•
CBREADY, CB ready for a reclosing cycle, for example, charged operating gear.
•
52a to ensure that the CB was closed when the line fault occurred and start was
applied.
•
No signal at input INHIBIT that is, no blocking or inhibit signal present. After the
start has been accepted, it is latched in and an internal signal “Started” is set. It can be
interrupted by certain events, like an “Inhibit” signal.
10.2.2.3
Initiate auto-reclosing from CB open information
If a user wants to initiate auto-reclosing from the "CB open" position instead of from
protection trip signals, the function offers such a possibility. This starting mode is selected
with the setting parameter
StartByCBOpen
=
Enabled
. It is then necessary to block
1MRK 511 286-UUS A
Section 10
Control
201
Application manual
Summary of Contents for REC650 ANSI
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