The switch positions used by the operational interlocking logic are obtained fromauxiliary contacts or position sensors. For each end position (open or closed) a trueindication is needed - thus forming a double indication. The apparatus controlfunction continuously checks its consistency. If neither condition is high (1 orTRUE), the switch may be in an intermediate position, for example, moving. Thisdynamic state may continue for some time, which in the case of disconnectors maybe up to 10 seconds. Should both indications stay low for a longer period, theposition 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 sensorsshall be self-checked and system faults indicated by a fault signal. In theinterlocking logic, the signals are used to avoid dangerous enable or releaseconditions. When the switching state of a switching device cannot be determinedoperation is not permitted.For switches with an individual operation gear per phase, the evaluation mustconsider 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.8.3.1 Configuration guidelines M13529-4 v4The following sections describe how the interlocking for a certain switchgearconfiguration can be realized in the IED by using standard interlocking modulesand their interconnections. They also describe the configuration settings. Theinputs for delivery specific conditions (Qx_EXy) are set to 1=TRUE if they are notused, except in the following cases:• QB9_EX2 and QB9_EX4 in modules BH_LINE_A and BH_LINE_B• QA1_EX3 in module AB_TRAFOwhen they are set to 0=FALSE.8.3.2 Interlocking for line bay ABC_LINE IP14139-1 v28.3.2.1 Application M13561-3 v8The interlocking for line bay (ABC_LINE) function is used for a line connected toa double busbar arrangement with a transfer busbar according to figure 47. Thefunction can also be used for a double busbar arrangement without transfer busbaror a single busbar arrangement with/without transfer busbar.Section 8 1MRK 511 423-UEN AControl128 Bay control REC650 2.2 IECApplication manual
