Re: Filtering options to remove redundant frames in IEC 61850 GOOSE comm. (Mayank Sharma)

[Mayank Sharma <mayank.sharma.84 () gmail com>]

Hello to all!

First a little introduction of myself. I am working with Schneider Electric
in IEC 61850 based substation automation solutions - R&D division.
I am testing GOOSE messaging "ping - pong " between a real device and a Test
Set. The way GOOSE works is this :

"

If any data value (encapsulated in the GOOSE frame changes) lots of GOOSE
messages are transmitted with the changed values using multicast mode. Since
the mode is "best effort" and the device will not know if the recipient has
received the message (unlike connection oriented TCP) , the device keep on
re-sending the frames continuously with a pre-set re-transmission time until
another data value change take place. In GOOSE implementation, the field
"StNum" in GOOSE PDU gets incremented every time there is an update in the
data value. There is also a field of "SeqNum" in the GOOSE PDU which keeps
on incrementing as long as there is no change in the data value.

e.g A GOOSE message with first change in data value will send GOOSE frame
with StNum = 1 and SeqNum = 0,1,2,3,4, .... unless there is another change
in the data value. If a data value changes the GOOSE exchange will contain
StNum = 2 and SeqNum = 0,1,2,3,4, ... and so on ...

"

I am triggering 1000 such data value changes with every data value changing
in 1sec.  What I want finally is a file with GOOSE frames with unique
"StNum" field. That is my file should contain only 1000 frames with 100
unique "StNum" values only. Is there a way to use
filtering capabilities to achieve such objective. ?

thanks in advance
Mayank

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