to operate is given after evaluation of conditions from other
functions such as interlocking, synchrocheck, operator place
selection and external or internal blockings.
Apparatus control features:
• Select-Execute principle to give high reliability
• Selection function to prevent simultaneous operation
• Selection and supervision of operator place
• Command supervision
• Block/deblock of operation
• Block/deblock of updating of position indications
• Substitution of position indications
• Overriding of interlocking functions
• Overriding of synchrocheck
• Operation counter
• Suppression of Mid position
Two types of command models can be used:
• Direct with normal security
• SBO (Select-Before-Operate) with enhanced security
Direct commands are received with no prior select command.
SBO commands are received with a select command first and
on successful selection, a proceeding operate command.
In normal security, the command is processed and the resulting
position is not supervised. However with enhanced security, the
command is processed and the resulting position is supervised.
Control operation can be performed from the local HMI under
authority control if so defined.
IEC09000668-1-en.vsd
IEC09000668 V1 EN
Figure 6.
Select before operation with confirmation of command
IEC09000669-2-en.vsd
Cancel
Ok
IEC09000669 V2 EN
Figure 7.
Overriding of synchrocheck
The switch controller SCSWI initializes and supervises all
functions to properly select and operate switching primary
apparatuses. Each of the 8 switch controllers SCSWI may
handle and operate on one three-phase apparatus.
Each of the 3 circuit breaker controllers SXCBR provides the
actual position status and pass the commands to the primary
circuit breaker and supervises the switching operation and
positions.
Each of the 7 circuit switch controllers SXSWI provides the
actual position status and pass the commands to the primary
disconnectors and earthing switches and supervises the
switching operation and positions.
Interlocking
The interlocking functionality blocks the possibility to operate
high-voltage switching devices, for instance when a
disconnector is under load, in order to prevent material damage
and/or accidental human injury.
Each control IED has interlocking functions for different
switchyard arrangements, each handling the interlocking of one
bay. The interlocking functionality in each IED is not dependent
on any central function. For the station-wide interlocking, the
IEDs communicate via the station bus or by using hard wired
binary inputs/outputs.
The interlocking conditions depend on the primary bus
configuration and status of any breaker or switch at any given
time.
Bay control QCBAY
The Bay control QCBAY function is used together with Local
remote and local remote control functions to handle the
selection of the operator place per bay. QCBAY also provides
blocking functions that can be distributed to different
apparatuses within the bay.
Local remote LOCREM /Local remote control LOCREMCTRL
The signals from the local HMI or from an external local/remote
switch are applied via the function blocks LOCREM and
Transformer protection RET650
1MRK 504 137-BEN B
Product version: 1.3
18
ABB
