Siemens SIPROTEC 4 Manual page 307

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Remote or DIGSI commands (SC = LOCAL, REMOTE, or DIGSI)
– interlocked, or
– non-interlocked switching. Here, deactivation of interlocking is accomplished via a separate
command.
– For commands from CFC (SC = AUTO SICAM), please observe the notes in the CFC manual (compo-
nent: BOOL to command).
Zone Controlled / Field Interlocking
Zone controlled / field interlocking (e.g. via CFC) includes the verification that predetermined switchgear posi-
tion conditions are satisfied to prevent switching errors (e.g. disconnector vs. ground switch, ground switch
only if no voltage applied) as well as verification of the state of other mechanical interlocking in the switch-
gear bay (e.g. High Voltage compartment doors).
Interlocking conditions can be programmed separately, for each switching device, for device control CLOSE
and/or OPEN.
The enable information with the data "switching device is interlocked (OFF/NV/FLT) or enabled (ON)" can be
set up,
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directly, using a single point or double point indication, key-switch, or internal indication (marking), or
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by means of a control logic via CFC.
When a switching command is initiated, the actual status is scanned cyclically. The assignment is done via
"Release object CLOSE/OPEN".
System Interlocking
Substation Controller (System interlocking) involves switchgear conditions of other bays evaluated by a central
control system.
Double Activation Blockage
Parallel switching operations are interlocked. As soon as the command has arrived all command objects
subject to the interlocking are checked to know whether a command is being processed. While the command
is being executed, interlocking is enabled for other commands.
Blocking by Protection
The pickup of protective elements blocks switching operations. Protective elements are configured, separately
for each switching component, to block specific switching commands sent in CLOSE and TRIP direction.
When enabled, "Block CLOSE commands" blocks CLOSE commands, whereas "Block TRIP commands" blocks
TRIP signals. Switching operations in progress will immediately be aborted by the pickup of a protective
element.
Device Status Check (set = actual)
For switching commands, a check takes place whether the selected switching device is already in the set/
desired position (set/actual comparison). This means, if a circuit breaker is already in the CLOSED position and
an attempt is made to issue a closing command, the command will be refused, with the operating message
"set condition equals actual condition". If the circuit breaker / switchgear device is in the intermediate position,
then this check is not performed.
Bypassing Interlockings
Bypassing configured interlockings at the time of the switching action happens device-internal via interlocking
recognition in the command job or globally via so-called switching modes.
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SC=LOCAL
– The user can switch between the modes "interlocked" or "non-interlocked" (bypassed) in the oper-
ator panel after entering the password or using CFC via binary input and function key.
SIPROTEC 4, 7SJ80, Manual
E50417-G1140-C343-A8, Edition 12.2017
Functions
2.24 Breaker Control
307