ABB REB670 Series, Applications Manual

Page: 306 / 476

dangerous
enable condition at the loss of a VT secondary voltage, for example, because of a
blown fuse.
The switch positions used by the operational interlocking logic are obtained from auxiliary
contacts or position sensors. For each end position (open or closed) a true indication is
needed - thus forming a double indication. The apparatus control function continuously checks
its consistency. If neither condition is high (1 or TRUE), the switch may be in an intermediate
position, for example, moving. This dynamic state may continue for some time, which in the
case of disconnectors may be up to 10 seconds. Should both indications stay low for a longer
period, the position indication will be interpreted as
unknown. If both indications stay high,
something is wrong, and the state is again treated as
unknown.
In both cases an alarm is sent to the operator. Indications from position sensors shall be self-
checked and system faults indicated by a fault signal. In the interlocking logic, the signals are
used to avoid dangerous
enable or release conditions. When the switching state of a switching
device cannot be determined operation is not permitted.
For switches with an individual operation gear per phase, the evaluation must consider
possible phase discrepancies. This is done with the aid of an AND-function for all three phases
in each apparatus for both open and close indications. Phase discrepancies will result in an
unknown double indication state.
12.4.1 Configuration guidelines
M13529-4 v4
The following sections describe how the interlocking for a certain switchgear configuration
can be realized in the IED by using standard interlocking modules and their interconnections.
They also describe the configuration settings. The inputs for delivery specific conditions
(Qx_EXy) are set to 1=TRUE if they are not used, except in the following cases:
• QB9_EX2 and QB9_EX4 in modules BH_LINE_A and BH_LINE_B
• QA1_EX3 in module AB_TRAFO
when they are set to 0=FALSE.
12.4.2 Interlocking for line bay ABC_LINE
IP14139-1 v2
12.4.2.1 Application
M13561-3 v8
The interlocking for line bay (ABC_LINE) function is used for a line connected to a double
busbar arrangement with a transfer busbar according to figure 147 . The function can also be
used for a double busbar arrangement without transfer busbar or a single busbar
arrangement with/without transfer busbar.
Section 12 1MRK 505 370-UEN D
Control
300 Busbar protection REB670
Application manual