Siemens SIPROTEC 7SJ62 Instruction Manual page 322

Functions
Zone Controlled/
Field Interlocking
Substation Control-
ler (System Inter-
locking)
Double Operation
Blocked by Protec-
tion
Device Position
(Scheduled = Actu-
al)
6-182
− Local commands (SC = LOCAL)
− interlocked, or
− non-interlocked switching.
For devices without key-switches, the switching mode can be changed between "in-
terlocked" and "non-interlocked" using the front PC port, after password entry.
− Remote or DIGSI ®
4 commands (SC = SAS, REMOTE, or DIGSI)
− interlocked, or
− non-interlocked switching. Here, deactivation of interlocking is accomplished via
a separate command. The position of the key-switch is irrelevant.
− Auto: For commands from CFC (SC = AUTO), the notes in the CFC handbook
should be referred to (e.g. component: BOOL to command)
Zone Controlled (field interlocking) includes the verification that predetermined switch-
gear position conditions are satisfied to prevent switching errors as well as verification
of the state of other mechanical interlocking such as High Voltage compartment doors
etc.
Interlocking conditions can be programmed separately, for each switching device, for
device control CLOSE and/or OPEN. Processing of the status of the release condition
for an operation switching device can be based on information acquired:
− directly, using a single point or double point indication (binary inputs), key-switch,
or internal indication (marking), or
− with logic using CFC.
When a switching command is initiated, the actual status of all relevant switching de-
vices is scanned cyclically.
Substation Controller (System interlocking) involves switchgear conditions of other
bays evaluated by a central control system. This functionality will be available with the
release of SW version 4.2.
Parallel switching operations are interlocked. When this function is enabled only one
control can be issued at a time. All control objects are checked prior to issuing a com-
mand.
When configured, the pickup of Protective elements blocks switching operations, con-
figurable separately for both closing and tripping commands. Operations in progress
will also be aborted by the pickup of a protective element.
For switching commands, a check takes place whether the selected switching device
is already in the scheduled/desired position (Open/Closed; scheduled/actual compar-
ison). This means, if a circuit breaker is already in the CLOSED position and an at-
tempt is made to issue a closing command, the command will be refused, with the op-
erating message "scheduled condition equals actual condition". If the circuit breaker/
switchgear device is in the intermediate position, then this check is not performed.
In
7SJ62 Manual
C53000-G1140-C121-1