Hitachi Relion 670 Series Applications Manual page 219

1MRK506375-UEN Rev. N
• 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.
12.2.3.3 Start auto reclosing from circuit breaker open information
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.
12.2.3.4 Blocking of the auto recloser
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.
12.2.3.5 Control of the auto reclosing dead time for shot 1
For the first shot, there is a separate setting for the dead time, t1. If no particular input signal is
applied, the auto reclosing dead time t1 will be used. There is also a separate time setting facility for
high-speed auto reclosing without synchrocheck, t1_HS, available for use when required. It is
activated by the STARTHS input.
12.2.3.6 Long trip signal
When start pulse duration signal is longer than set maximum start pulse duration, the auto reclosing
sequence interrupts in the same way as for a signal to the INHIBIT input.
12.2.3.7 Maximum number of reclosing shots
The maximum number of auto reclosing shots in an auto reclosing cycle is selected by the setting
NoOfShots. A maximum of five shots can be done.
12.2.3.8 Auto reclosing reclaim timer
The tReclaim timer defines the time it takes from issue of the breaker closing command, until the
auto recloser resets. Should a new trip occur during this time, it is treated as a continuation of the
first fault. The reclaim timer is started when the circuit breaker closing command is given.
Railway application RER670
Application manual
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Section 12
Control
M12391-100 v6
M12391-103 v4
M12391-113 v5
M12391-117 v4
M12391-120 v7
M12391-202 v4
213