Start Auto-Reclosing And Conditions For Start Of A Reclosing Cycle; Start Auto-Reclosing From Cb Open Information; Blocking Of The Autorecloser; Control Of The Auto-Reclosing Open Time For Shot 1 - ABB Relion REC670 Applications Manual

Section 13
Control
13.2.2.2

Start auto-reclosing and conditions for start of a reclosing cycle

The usual way to start a reclosing cycle, or sequence, is to start it at selective tripping by line
protection by applying a signal to the input START. 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 function 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 a reclosing sequence.
In cases where one wants to differentiate three-phase "auto-reclosing open time", ("dead
time") for different power system configuration or at tripping by different protection stages,
one can also use the input STARTHS (Start High-Speed Reclosing). When initiating STARTHS,
the auto-reclosing open time for three-phase shot 1,
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, CB ready for a reclosing cycle, for example, charged operating gear.
• CBPOS 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.
13.2.2.3

Start 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
manual trip operations. Typically
contact of type NC (normally closed) is connected to inputs CBPOS and START. When the
signal changes from "CB closed" to "CB open" an auto-reclosing start pulse is generated and
latched in the function, subject to the usual checks. Then the reclosing sequence continues as
usual. One needs to connect signals from manual tripping and other functions, which shall not
be reclosed automatically to the input INHIBIT.
13.2.2.4

Blocking of the autorecloser

Auto-Reclose attempts are expected to take place only for faults on the own line. The Auto-
Recloser must be blocked by activating the INHIBIT input for the following conditions:
• Tripping from Delayed Distance protection zones
• Tripping from Back-up protection functions
• Tripping from Breaker failure function
• Intertrip received from remote end Breaker failure function
• Busbar protection tripping
Depending of the starting principle (General Trip or only Instantaneous trip) adopted above
the delayed and back-up zones might not be required. Breaker failure trip local and remote
must however always be connected.
13.2.2.5

Control of the auto-reclosing open time for shot 1

Up to four different time settings can be used for the first shot, and one extension time. There
are separate settings for single-, two- and three-phase auto-reclosing open time,
2Ph, t1 3Ph . If no particular input signal is applied, and an auto-reclosing program with single-
242
StartByCBOpen = On . It is then necessary to block reclosing for all
CBAuxContType = NormClosed is also set and a CB auxiliary
t1 3PhHS is used and the closing is done
1MRK 511 358-UEN A
M12391-94 v4
M12391-100 v5
M12391-103 v3
M12391-113 v4
t1 1Ph, t1
Application manual