Steps In The Command Sequence - Siemens SIPROTEC 7SA6 Manual

Distance protection relay for all voltage levels

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6.24.2 Steps in the Command Sequence

Check Sequence

C53000-G1176-C156-2

− Status information commands for setting / deactivating the "information status" for

the information value of an object:

− Controlling activation of binary input status

− Blocking binary outputs

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.

Additionally, user-defined interlocking conditions can be configured separately for

each device. The actual execution of the command is also monitored afterwards. The

entire sequence of a command is described briefly in 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 status

• User configurable interlocking checks that can be selected for each command

− Switching authority (local, remote)

− Switching direction control (target state = present state)

− Zone controlled/bay interlocking (logic using CFC)

− System interlocking (centrally via SICAM)

− Double operation (interlocking against parallel switching operation)

− Protection blocking (blocking of switching operations by protective functions)

• Fixed commands

− Timeout monitoring (time between command initiation and the beginning of the

execution can be controlled).

− Configuration in process (if setting modification is in process, commands are re-

jected or delayed)

− Equipment not present at output (if controllable equipment is not assigned to a

binary output, then 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)

− Component hardware malfunction

− Command in progress (only one command can be processed at a time for each

circuit breaker or switch)

− 1- out of -n-check (for schemes with multiple assignments, such as common

ground, it is checked whether a command has already been initiated for the af-

fected output relay).