is given after evaluation of conditions from other functions such as interlocking,
synchrocheck, operator place selection and external or internal blockings.
The complete apparatus control function is not included in this
product, and the information below is included for understanding of
the principle for the use of QCBAY, LOCREM, LOCREMCTRL,
SCILO, SCSWI, SXCBR.
Figure 107 shows from which places the apparatus control function receives
commands. The commands to an apparatus can be initiated from the Control
Centre (CC), the station HMI or the local HMI on the IED front.
Station HMI
GW
cc
Station bus
breakers disconnectors earthing switches
IEC08000227.vsd
Apparatus
Control
IED
I/O
Local
HMI
Apparatus
Control
IED
I/O
Apparatus
Control
IED
I/O
Local
HMI
Local
HMI
IEC08000227 V1 EN-US
Figure 107: Overview of the apparatus control functions
Features in the apparatus control function:
• Operation of primary apparatuses
• Select-Execute principle to give high security
• 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
Section 12 1MRK 505 393-UEN B
Control
252 Line differential protection RED650 2.2 IEC
Application manual
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