It is not possible to read the IEC configuration back from the P634 if the “Dataset”
sizes exceed the GOOSE size limit significantly. Therefore it is recommended to
limit the “Dataset” size(s) to 100% of the GOOSE capacity. Too large a dataset can
spoil IEC 61850 communication. Hence, the dataset size limit of 100% of the
GOOSE capacity should not be exceeded, neither for GOOSE nor for reports.
When defining the datasets for GOOSE it is advised to select the individual data
attributes and not the overlapping data objects. By this the amount of data is
kept within a limit and decoding is guaranteed on the receiving end.
In addition to the information included in the IEC 61850 data model an optional
number of up to 32 signals can be selected from all the signals available in the
P634 to be transmitted via GOOSE, as it is also possible with reporting.
Selection of binary state signals (shuttling to communications) is made by setting
GOOSE: Output 1 fct.assig.. (or Output 2, ..., Output 32). The data object
indexes defined for SigGGIO1 must follow the function assignments for the
GOOSE outputs. The indexes GosGGIO2.ST.ind1 to GosGGIO2.ST.ind32 may then
be included in the datasets just as the other data objects.
When a state change occurs with a selected state signal or a measured value
changes which is greater than the dead band set for the relevant data point then
the complete GOOSE is sent. There will be multiple send repetitions at ascending
time periods. The first send repetition occurs at the given cycle time set with the
parameter [IC]: Minimum Cycle Time. The cycles for the following send
repetitions result from a conditional equation with the increment set with the
parameter [IC]: Increment. Should no further state changes occur up to the
time when the maximum cycle time has elapsed [IC]: Maximum Cycle Time,
then GOOSE will be sent cyclically at intervals as set for the maximum cycle
time.
In order to have unambiguous identification of a GOOSE sent, characteristics
such as [IC]: Multicast MAC Address, [IC]: Application ID (hex),
[IC]: VLAN Identifier (hex), [IC]: VLAN Priority and
[IC]: GOOSE Identifier must be entered in the IED Configurator settings.
Further characteristics are [IC]: Dataset Reference and
[IC]: Configuration Revision.
Each GOOSE is given the state change index and the number of send repetitions.
3.4.4.2.3 Receiving GOOSE
With GOOSE up to 128 logic binary state signals as well as 128 two-pole contact
position signals from external devices (Ext.Devxx) can be received. For each
state signal or contact position signal to be received a specific GOOSE message
is to be selected, which will contain the information wanted, by setting
[IC]: Multicast MAC Address, [IC]: Application ID (hex),
[IC]: Source Path, [IC]: GOOSE Identifier and [IC]: DataSet Reference.
With the further setting of [IC]: Data Obj Index / Type, which corresponds to
the GOOSE position index and the information structure of the sending device,
the required information from the chosen GOOSE will be selected. The
identification features "VLAN identifier" and [IC]: Configuration Revision
that are also included in the GOOSE received will not be evaluated.
These parameters characterizing the information may be taken either from
device or project planning documentation of the sending device or from a
configuration file which is conform to IEC 61850. The IED Configurator will
support the import of .IID, .SCD and .MCL files when the "browse function"
(virtual key) is applied. The selection and acceptance of parameters from an
existing project planning is distinguished by a simplified and very reliable data
input.
3 Operation
P634
P634/EN M/R-42-A // P634‑311‑653 3-29
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