Interlocked/Non-Interlocked Switching - Siemens SIPROTEC 7SJ62 Instruction Manual
Multi-functional protective relay with bay controller
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- Technical data manual (58 pages) ,
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6.20.3.1 Interlocked/Non-Interlocked Switching
Standard Interlock-
ing Defaults
7SJ62 Manual
C53000-G1140-C121-1
The command checks that can be selected for the 7SJ62 relay are also referred to as
"standard interlocking". These checks can be activated (interlocked) or deactivated
(non interlocked).
Deactivated interlock switching means the configured interlocking conditions are not
checked in the relay.
Interlocked switching means that all configured interlocking conditions are checked
within the command processing.
Interlocking conditions (e.g. device Position Check, Blocked by Protection etc.) for
each control device are individually selectable in the Command Output-object proper-
ties box.
Internal control actions are always executed regardless of any interlocking.
The following is a list of Standard Interlocking Conditions that can be selected for each
controllable device. All of these are enabled as a default.
• System Interlocking/Substation Controlled: in preparation, to be implemented with
Version 4.2.
• Zone Controlled/Bay Interlocking: All devices controlled by this relay can be inter-
locked by the CFC logic.
• Device Status Check (scheduled = actual): the switching command is rejected, and
an error message is displayed, if the circuit breaker is already in the scheduled (de-
sired) position. (If this check is enabled, then it works whether interlocking, e.g.
zone controlled, is activated or deactivated.) This condition is checked in both inter-
locked and non-interlocked status modes.
• Blocked by protection: A CLOSE-command is rejected as soon as one of the pro-
tective elements in the relay picks up. The OPEN-command, in contrast, can always
be executed. Please be aware, activation of thermal overload protection elements
or sensitive ground fault detection can create and maintain a fault condition status,
and can therefore block CLOSE commands. If the interlocking "%ORFNLQJ E\
SURWHFWLRQ" is removed, consider that the restart blocking for motors will also be
disabled, and a CLOSE command to the motor would be possible. Restarting would
then have to be interlocked some other way. One method would be to use a specific
interlocking in the CFC logic.
• Double Operation Block: parallel switching operations are interlocked against one
another; while one command is processed, a second cannot be carried out.
• Switch Authority LOCAL: When this interlocking check is enabled in the Object
Properties dialog box, the status of Switching authority is checked prior to issuing a
control command. If this particular setting is selected, a control command from the
user interface of the device is only allowed if switching authority is set to LOCAL.
• Switch Authority DIGSI: Switching commands can be issued locally or remotely via
DIGSI. As part of the safety features, the device will check the DIGSI configuration
file in regard to the virtual device number to ensure that the correct configuration file
is used. DIGSI must have the same virtual device number. It is important that one
file can not be reused with multiple relays. But it is possible to copy the file and use
the new file with another relay.
• Switch Authority REMOTE: When this interlocking check is enabled in the Object
Properties dialog box, the status of Switching authority is checked prior to issuing a
control command. If this particular setting is selected a control command from a re-
Functions
6-179
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