Hitachi Relion 670 Series Applications Manual page 222

Section 12
Control
BLKOFF
Used to unblock the auto recloser when it has been blocked due to activating BLKON input or by an
unsuccessful auto reclosing attempt if the BlockByUnsucCl setting is set to On.
BLKON
Used to block the auto recloser, for example, when certain special service conditions arise. When
used, blocking must be reset with BLKOFF.
CBCLOSED and CBREADY
These binary inputs should pick-up information from the circuit breaker. At three operating gears in
the circuit breaker (single pole operated circuit breakers) the connection should be "All poles closed"
(series connection of the NO contacts) or "At least one pole open" (parallel connection of NC
contacts). The CBREADY is a signal meaning that the circuit breaker is ready for an auto reclosing
operation, either Close-Open (CO), or Open-Close-Open (OCO). If the available signal is of type
"circuit breaker not charged" or "not ready", an inverter can be inserted in front of the CBREADY
input.
INHIBIT
To this input shall be connected signals that interrupt an auto reclosing cycle or prevent a start from
being accepted. Such signals can come from protection for a line connected shunt reactor, from
transfer trip receive, from back-up protection functions, busbar protection trip or from breaker failure
protection. When the circuit breaker open position is set to start the auto recloser, then manual
opening must also be connected here. The inhibit is often a combination of signals from external
IEDs via the I/O and internal functions. An OR-gate is then used for the combination.
ON and OFF
These inputs can be connected to binary inputs or to a communication interface block for external
control.
RESET
Used to reset the auto recloser to start conditions. Possible hold by thermal overload protection will
be reset. Circuit breaker position will be checked and time settings will be restarted with their set
times.
RSTCOUNT
There is a counter for each type of auto reclosing and one for the total number of circuit breaker
close commands issued. All counters are reset with the RSTCOUNT input or by an IEC 61850
command.
SKIPHS
The high-speed auto reclosing sequence can be skipped and be replaced by normal auto reclosing
sequence by activating SKIPHS input before the STARTHS high-speed start input is activated. The
replacement is done for the 1st shot.
START
The START input should be connected to the trip function (SMPPTRC) output, which starts the auto
recloser operation. It can also be connected to a binary input for start from an external contact. A
logical OR-gate can be used to combine the number of start sources.
216
If StartByCBOpen is used, the circuit breaker open condition shall also be connected to
the START input.
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1MRK506375-UEN Rev. N
Railway application RER670
Application manual