ABB Relion 615 series Manual page 31

1MRS756710 C
615 series
Communication Protocol Manual
cycle operates as defined by the standard. GI optimization strives to send less data
to the master through the Class 1 report. The GI optimization in the IED is based
on two facts:
• It is enough to send a certain Class 1 data once to the master after a GI
initiation. This could be either the GI data report or a spontaneously updated
data report. In either case the master has the true position of the Class 1 data in
its database.
• The IED also remembers which specific Class 1 data objects changes that has
overflown. After the GI initiation only these marked Class 1 data objects are
reported through the GI cycle.
Table 9: GI optimization alternatives
Parameter value Description
Standard behaviour No optimization.
Skip spontaneous Enables the IED to not send GI data for those objects that already have been
spontaneously updated by the IED (that is, sent as Class 1 events) after the
initiation of a GI.
Only overflown Enables the IED to send only the Class 1 data that it knows have overflown in
the Class 1 buffer. The first GI cycle initiated after a master Reset CU or
Reset FCB does not use this feature, that is, the IED keeps track of that it
actually has reported a value at least once since the last reset to the master.
Combined Combines the two optimization features explained above.
Vendor-specific implementation
Section 3
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