Siemens siprotec 7SD5 User Manual

2 Functions
438
7SD5 Manual
C53000-G1176-C169-1
– Command in progress (only one command can be processed at a time for each
circuit breaker or switch);
– 1–of–n check (for multiple allocations such as common contact relays it is
checked if a command procedure was already initiated for the output relays con-
cerned).
Command Execu-
tion Monitoring
The following is monitored:
• Interruption of a command because of a cancel command,
• Running time monitor (feedback monitoring time).
2.25.1.3 Switchgear Interlocking
Interlocking can be executed by the user-defined logic (CFC). System interlocking
checks in a SICAM
®
/SIPROTEC
®
system are usually categorized as follows:
• System interlocking checked by a central control system (for interbay interlocking),
• Zone controlled / bay interlocking checked in the bay device (for the feeder).
System interlocking is based on the process replica of the master device Zone con-
trolled / bay interlocking relies on the object database (feedback information) of the
bay unit (here the SIPROTEC
®
4 relay) as was determined during configuration (see
SIPROTEC
®
4 System Description).
The extent of the interlocking checks is determined by the configuration and interlock-
ing logic of the relay.
Switching objects that require system interlocking in a central control system are as-
signed to a specific parameter inside the bay unit (via configuration matrix).
For all commands, operation with interlocking (normal mode) or without interlocking
(test mode) can be selected:
• For local commands by reprogramming the settings with password check,
• For automatic commands, via command processing by CFC and Deactivated Inter-
locking Recognition,
• For local / remote commands, using an additional interlocking disable command via
PROFIBUS.
Interlocked/Non-in-
terlocked Switch-
ing
The configurable command checks in the SIPROTEC
®
4 devices are also called „stan-
dard interlocking“. These checks can be activated using DIGSI
®
(interlocked switch-
ing/tagging) or deactivated (non-interlocked).
De-interlocked or non-interlocked switching means that the configured interlock con-
ditions are not tested.
Interlocked switching means that all configured interlocking conditions are checked
within the command processing. If a condition could not be fulfilled, the command will
be rejected by an indication with a minus added to it, e.g. „CO–“, followed by an oper-
ation response information. The command is rejected if a synchronism check is
carried out before closing and the conditions for synchronism are not fulfilled. Table 2-
24 shows some types of commands and indications. For the device the indications
designated with *) are displayed in the event logs, for DIGSI
®
they appear in sponta-
neous indications.
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Siemens siprotec 7SD5 Specifications

General

Brand	Siemens
Model	siprotec 7SD5
Category	Relays
Language	English