Siemens SIPROTEC 6MD665, Manual

Page: 40 / 222

2 Functions
26
6MD665 Manual
C53000-G1876-C103-3
– interlocked (normal), or
– non-interlocked switching.
The 6MD665 is equipped with two key switches. The bottom switch is reserved for
the switching mode. The "Normal" position allows interlocked switching while the
"Interlocking OFF" position allows non-interlocked switching.
The following switching modes (remote) are defined:
• Remote or DIGSI
®
commands (SC = LOCAL, REMOTE, or DIGSI)
– interlocked, or
– non-interlocked switching. Here de-interlocking occurs through a separate de-
interlocking job. The position of the key-switch is irrelevant.
– For commands from CFC (SC = AUTO SICAM), please observe the notes in the
DIGSI CFC manual /3/ (block: BOOL after command).
Switching Mode (for devices without operator panel)
The dongle cable sets the switching mode of the device to "Normal". The specifica-
tions of the previous section apply.
Zone Controlled/Field Interlocking
Zone controlled / field interlocking (e.g. via CFC) includes the verification that prede-
termined switchgear position conditions are satisfied to prevent switching errors (e.g.
disconnector vs. earth switch, earth switch only if no voltage applied) as well as veri-
fication of the state of other mechanical interlocking in the switchgear bay (e.g. High
Voltage compartment doors).
Interlocking conditions can be programmed separately, for each switchgear, for device
control OPEN and/or CLOSE.
The enable information with the data "switchgear is interlocked (OFF/NV/FLT) or
enabled (ON)" can be set up,
• directly, using a single point or double point indication, key-switch, or internal indi-
cation (marking), or
• by means of a control logic via CFC.
The current status is queried for a control command and updated cyclically. The
assignment is done via "Release object OPEN/CLOSE".
System interlocking
The system interlockings are then considered (allocation via central unit).
Double activation blockage
Parallel switching operations are interlocked. On arrival of a command all command
objects are tested which are also subject to the blockage, as to whether a command
is current for them. While the command is being executed, the inhibit is in turn active
for all other commands.
Device Status Check (scheduled = actual)
For switching commands, a check takes place whether the selected switchgear is
already in the scheduled/desired position (scheduled/actual comparison). This
means, if a circuit breaker is already in the CLOSED position and an attempt is made