The open or closed positions of the HV apparatuses are inputs to software modules
distributed in the control IEDs. Each module contains the interlocking logic for a bay. The
interlocking logic in a module is different, depending on the bay function and the
switchyard arrangements, that is, double-breaker or breaker-and-a-half bays have
different modules. Specific interlocking conditions and connections between standard
interlocking modules are performed with an engineering tool. Bay-level interlocking
signals can include the following kind of information:
•
Positions of HV apparatuses (sometimes per phase)
•
Valid positions (if evaluated in the control module)
•
External release (to add special conditions for release)
•
Line voltage (to block operation of line grounding switch)
•
Output signals to release the HV apparatus
The interlocking module is connected to the surrounding functions within a bay as shown
in figure
Interlocking
modules in
other bays
Interlocking
module
SCILO
SCSWI
Apparatus control
modules
SXCBR
SCILO
SCSWI
SXSWI
Apparatus control
modules
SCILO
SCSWI
SXSWI
Apparatus control
modules
en04000526_ansi.vsd
152
ANSI04000526 V1 EN
Figure 202:
Interlocking module on bay level
Bays communicate via the station bus and can convey information regarding the
following:
•
Ungrounded busbars
•
Busbars connected together
•
Other bays connected to a busbar
•
Received data from other bays is valid
Figure
illustrates the data exchange principle.
1MRK 502 048-UUS A
Section 12
Control
445
Technical manual
