12.3.3.5 Bay Reserve (QCRSV) M16677-3 v3The timer tCancelRes defines the supervision time for canceling the reservation, whenthis cannot be done by requesting bay due to for example communication failure.When the parameter ParamRequestx (x=1-8) is set to Only own bay res. individuallyfor each apparatus (x) in the bay, only the own bay is reserved, that is, the output forreservation request of other bays (RES_BAYS) will not be activated at selection ofapparatus x.12.3.3.6 Reservation input (RESIN) M16678-3 v3With the FutureUse parameter set to Bay future use the function can handle bays notyet installed in the SA system.12.4 Interlocking (3) IP15572-1 v2M13530-4 v4The main purpose of switchgear interlocking is:• To avoid the dangerous or damaging operation of switchgear• To enforce restrictions on the operation of the substation for other reasons forexample, load configuration. Examples of the latter are to limit the number ofparallel transformers to a maximum of two or to ensure that energizing is alwaysfrom one side, for example, the high voltage side of a transformer.This section only deals with the first point, and only with restrictions caused byswitching devices other than the one to be controlled. This means that switch interlock,because of device alarms, is not included in this section.Disconnectors and grounding switches have a limited switching capacity.Disconnectors may therefore only operate:• With basically zero current. The circuit is open on one side and has a smallextension. The capacitive current is small (for example, < 5A) and powertransformers with inrush current are not allowed.• To connect or disconnect a parallel circuit carrying load current. The switchingvoltage across the open contacts is thus virtually zero, thanks to the parallel circuit(for example, < 1% of rated voltage). Paralleling of power transformers is notallowed.Grounding switches are allowed to connect and disconnect grounding of isolatedpoints. Due to capacitive or inductive coupling there may be some voltage (for1MRK 505 370-UUS A Section 12ControlBusbar protection REB670 2.2 ANSI 361Application manual
