Command Sequence; Description - Siemens siprotec SJ62 User Manual

2 Functions

2.25.3 Command Sequence

2.25.3.1 Description

Check Sequence
Monitoring the
Command Execu-
tion
353
Safety mechanisms in the command sequence ensure that a command can only be
released after a thorough check of preset criteria has been successfully concluded.
Standard Interlocking checks are provided for each individual control command. Addi-
tionally, user-defined interlocking conditions can be programmed separately for each
command. The actual execution of the command is also monitored afterwards. The
overall command task procedure is described in brief in the following list:
Please observe the following:
• Command Entry, e.g. using the keypad on the local user interface of the device
– Check Password → Access Rights
– Check Switching Mode (interlocking activated/deactivated) → Selection of Deac-
tivated interlocking Recognition.
• User configurable interlocking checks
– Switching Authority
– Device Position Check (set vs. actual comparison)
– Interlocking, Zone Controlled (logic using CFC)
– System Interlocking (centrally, using SCADA system or substation controller)
– Double Operation (interlocking against parallel switching operation)
– Protection Blocking (blocking of switching operations by protective functions).
• Fixed Command Checks
– Internal Process Time (software watch dog which checks the time for processing
the control action between initiation of the control and final close of the relay con-
tact)
– Setting Modification in Process (if setting modification is in process, commands
are denied or delayed)
– Operating equipment enabled as output (if an operating equipment component
was configured, but not configured to a binary input, the command is denied)
– Output Block (if an output block has been programmed for the circuit breaker,
and is active at the moment the command is processed, then the command is
denied)
– Board Hardware Error
– Command in Progress (only one command can be processed at a time for one
operating equipment, object-related Double Operation Block)
– 1-of-n-check (for schemes with multiple assignments, such as relays contact
sharing a common terminal a check is made if a command is already active for
this set of output relays).
The following is monitored:
• Interruption of a command because of a Cancel Command
• Running Time Monitor (feedback message monitoring time)
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015