17.8
SEL-400 Series Relays Instruction Manual Date Code 20171006
IEC 61850 Communication
IEC 61850 Operation
Any AddCause value not specified above is not supported. Control CDC data
attributes which are associated with unsupported AddCause values and are not
part of a control structure will be accepted but ignored. For example, the attribute
CmdBlk.stVal which is associated with the AddCause value “blocked-by-com-
mand” and is not part of a SBOw, Oper or Cancel structure will be ignored.
Group Switch Via MMS
The Group Switch feature in IEC 61850 is primarily a convenience feature for
users so that they can institute a settings group switch from an IEC 61850 client
without having to revert to the command line or some other tool. However, this
has great potential for integration with IEC 61850 SCADA systems which would
be able to control setting groups through IEC 61850 MMS.
The IEC 61850 specification outlines a method for switching the current settings
group to another preconfigured settings group. The setting group control block,
or SGCB, contains the SettingControl element which enables settings group con-
trol. An SEL-400 series CID file that supports group switch functionality will
only contain one SGCB. The SGCB contains the number of settings groups in the
relay and may also contain the current active setting group, ActSG. Note that if
the CID file contains a value for ActSG, it will be ignored and the relay will use
the actual active setting group value for ActSG at the time of CID file download.
When the IEC 61850 functions of the relay are enabled, the selectActiveSG ser-
vice allows an MMS client to request that the relay change the active setting
group. The MMS client can request a group switch by writing a valid setting
group number to ActSG. The relay updates the ActSG value under the following
conditions:
➤ The value written to ActSG is valid and not the current active group
➤ There is no group switch in progress
➤ The setting of the active group was successful.
Note that if the value written to ActSG is the same as the current group, the relay
will not attempt to switch settings groups. Please refer to Multiple Setting Groups
on page 12.4 for more information on group settings.
6 Parameter-change-in-
execution
Control object is already selected by the client, and
1. Logical node is set to local mode i.e., Loc.stVal = true,
or
2. Originator category not allowed to issue control commands
8 Blocked-by-mode Mode of logical device or node is not ON
12 Command-already-
in-execution
Execution of a previous control is not completed
13 Blocked-by-health Health of logical device or node is not OK
16 Time-limit-over CommandTermination gives a negative response. (The
control failed to reach its intended state prior to time-out.)
18 Object-not-selected Cancel operation fails
Table 17.4 AddCause Descriptions (Sheet 2 of 2)
AddCause
Enumeration
AddCause
Description
Error Condition
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