Siemens 7SJ82 Manual page 1117

•
Non-revocable (fixed) interlocking conditions:
These are still checked even if the switching mode is set to non-interlocked.
Application: Replacing mechanical interlocking, for example, that prevent actuation of a medium-
voltage switch.
Each of the two categories has 2 release signals (for the On and Off switching directions) that represent the
result of the interlocking plan, so that interlocking is in effect during the command check (see the figure
below). The default setting for all release signals is TRUE, so that no switchgear interlocking checks take place
if no CFC charts have been prepared.
[scverrie-260912-01.tif, 1, en_US]
Figure 8-39
EXAMPLE
For interlocking
For the making direction of the circuit breaker QA in bay E01 (see the figure below), it is necessary to check
whether the disconnectors QB1, QB2, and QB9 are in the defined position, that is, either On or Off. Opening
the circuit breaker QA should be possible at any time.
The interlocking equations are: QA_On = ((QB1 = On) or (QB1 = Off)) and ((QB2 = On) or (QB2 = Off)) and
((QB9 = On) or (QB9 = Off)). There is no condition for opening.
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
Interlocking Signals in Function Block Interlocking
Control Functions
8.3 Control Functionality
1117