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.
15.3.1 Configuration guidelines
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.
15.3.2 Interlocking for line bay ABC_LINE
15.3.2.1 Application
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
242. The
function can also be used for a double busbar arrangement without transfer busbar or
a single busbar arrangement with/without transfer busbar.
1MRK 502 071-UEN - Section 15
Control
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062 515
Application manual
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