•
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 6-39
Interlocking Signals in Function Block Interlocking
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.
Control Functions
6.3 Control Functionality
SIPROTEC 5, High-Voltage Bay Controller, Manual
347
C53000-G5040-C015-9, Edition 11.2017
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