Interlocking; Description - Siemens siprotec SJ62 User Manual

2.25.4 Interlocking

2.25.4.1 Description

Interlocked/Non-in-
terlocked Switch-
ing
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
System interlocking is executed by the user-defined logic (CFC).
Switchgear interlocking checks in a SICAM/SIPROTEC 4 system are normally divided
in the following groups:
• System interlocking relies on the system data base in the substation or central
control system.
• Bay interlocking relies on the object data base (feedbacks) of the bay unit.
• Cross-bay interlocking via GOOSE messages directly between bay units and pro-
tection relays (with the introduction of IEC61850, V4.51; GOOSE information ex-
change will be accomplished via EN100-module).
The extent of the interlocking checks is determined by the configuration of the relay.
To obtain more information about GOOSE, please refer to the SIPROTEC System De-
scription /1/.
Switching objects that require system interlocking in a central control system are as-
signed to a specific parameter inside the bay unit (via configuration matrix).
For all commands, operation with interlocking (normal mode) or without interlocking
(Interlocking OFF) can be selected:
• For local commands, by activation of "Normal/Test"-key switch,
• For automatic commands, via command processing. by CFC and deactivated inter-
locking recognition,
• For local / remote commands, using an additional interlocking disable command,
via Profibus.
The configurable command checks in the SIPROTEC 4 devices are also called "stan-
dard interlocking". These checks can be activated via DIGSI (interlocked switch-
ing/tagging) 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. If a condition is not fulfilled, the command is rejected,
marked with a minus sign (e.g. „CO–"), and a message to that effect is output.
The following table shows the possible types of commands in a switching device and
their corresponding annunciations. For the device the messages designated with *)
are displayed in the event logs, for DIGSI they appear in spontaneous messages.
Type of Command
Control issued
Manual tagging (positive / nega-
tive)
Information state command, Input
blocking
Information state command,
Output blocking
Cancel command
Control
Switching CO
Manual tagging MT
Input blocking ST
Output Blocking ST
Cancel CA
2.25 Breaker Control
Cause Message
CO+/–
MT+/–
ST+/– *)
ST+/– *)
CA+/–
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