Schweitzer Engineering Laboratories SEL-421-4, Instruction Manual

Page: 1361 / 1518

17.11
Date Code 20171006 Instruction Manual SEL-400 Series Relays
IEC 61850 Communication
IEC 61850 Operation
Similarly, for unbuffered reports, connected clients may edit the report parame-
ters shown in
Table 17.6 .
For buffered reports, only one client can enable the RptEna attribute of the BRCB
at a time resulting in a client association for that BRCB. Once enabled, the asso-
ciated client has exclusive access to the BRCB until the connection is closed or
the client disables the RptEna attribute. Once enabled, all unassociated clients
have read only access to the BRCB.
For unbuffered reports, as many as seven clients can enable the RptEna attribute
of an URCB at a time resulting in multiple client associations for that URCB.
Once enabled, each client has independent access to a copy of that URCB.
The Resv attribute is writable, however, the relay does not support reservations.
Writing any field of the URCB causes the client to obtain their own copy of the
URCB-in essence, acquiring a reservation.
Reports are serviced at a 2 Hz rate. The client can set the IntgPd to any value with
a resolution of 1 ms. However, the integrity report is only sent when the period
has been detected as having expired. The report service rate of 2 Hz results in a
report being sent within 500 ms of expiration of the IntgPd. The new IntgPd will
begin at the time that the current report is serviced.
Datasets
IEC 61850 datasets are lists of references to DataObject attributes for the purpose
of efficient observation and transmission of data. Architect ICD files come with
predefined datasets that can be used to transfer data via GOOSE messages, SV
messages, or MMS reports.
➤
GOOSE: You can use predefined or edited datasets, or create new
datasets for outgoing GOOSE transmission.
➤
SV: Four predefined datasets are provided. Each dataset includes
three phase currents and the neutral current as well as three phase
voltages and the neutral voltage.
Table 17.6 Unbuffered Report Control Block Client Access
RCB Attribute
User Changeable
(Report Disabled) User Changeable
(Report Enabled)
Default Values
RptID YES URep01–URep07
RptEna YES YES FALSE
Resv YES FALSE
OptFlds YES seqNum
timeStamp
dataSet
reasonCode
BufTm YES 250
TrgOps YES dchg
qchg
period
IntgPd YES 0
GI YES
a
a
Exhibits a pulse behavior. Write a one to issue the command. Once command is accepted will
return to zero. Always read as zero.
FALSE