• 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
circuit breaker open an auto reclosing start pulse is generated and latched in the
function, subject to the usual checks. The auto reclosing sequence continues then as
usual. Signals from manual tripping and other functions, which shall prevent auto
reclosing, need to be connected to the INHIBIT input.
12.2.2.4 Blocking of the auto recloser
M12391-103 v4
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 circuit 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.
12.2.2.5 Control of the auto reclosing dead time for shot 1
M12391-113 v5
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
dead time, t1 1Ph, t1 2Ph, t1 3Ph. If no particular input signal is applied, and an
auto reclosing program with single-phase auto reclosing is selected, the auto
reclosing dead time t1 1Ph will be used. If one of the TR2P or TR3P inputs is
activated in connection with the start, the auto reclosing dead time for two-phase or
three-phase auto reclosing is used. There is also a separate time setting facility for
three-phase high-speed auto reclosing without synchrocheck, t1 3PhHS, available
for use when required. It is activated by the STARTHS input.
Section 12 1MRK 505 393-UEN B
Control
234 Line differential protection RED650 2.2 IEC
Application manual
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