Sepam GOOSE

[Ivan_Puškaš_EC]

Hi,

We have a problem on Sepam relay with GOOSE mechanism. In last few months, time to time (every 20-30 days) Sepam receive signal about Breaker fail (50BF) over GOOSE. Problem is that none of the other feeder/motor relays sends this signal on the network.

GOOSE Logic was checked many times and no error was found. SCD is attached in case anyone is wondering about the GOOSE logic. And logic is simple:

All LD0.EQU_GGIO1.Ind1 are connected to G403 on the bay that needs to receive it, and G403 is in Sepam defined as "External trip"

EQU_GGIO1.Ind1 is V1 in equation and it is just the confirmation that CB is racked in (Input I111): V1  = P50BF_1_3  AND I111 . (if CB is racked in 50BF trip signal is send over V1 to the network if appears)

So recap: Incomer sees G403 signal as value 1 and it trips the CB, but none of the feeders that can send signal to Ethernet, sends it. Both signals on feeder are checked, 50BF signal and Equation V1 signal, none appears in the feeder log. This just looks like G403 signal has no correct value in one moment.

This appeared and two-three different incomers but never in the same time. Always only one incomer detects the signal. Other two are OK at that moment.

So,

First: Did, anyone had similar problem with, let's say "phantom" signal in GOOSE messaging? And did you realize what was the problem?

Second: Is there a solution to fix this problem or to implement something to secure right GOOSE communication?

Third: We are not sure about the meaning of the few signals and it would be appreciated if you can explain it. Maybe they can be used to secure correct GOOSE messaging.

- Quality status: QD Value of the "quality of data" flag for that message

- Quality status: QR Value of the "quality of reception" flag for that message

- GOOSE indication - as GOOSE input in Sepam

- GOOSE reception Fault - as GOOSE input in Sepam

- any other signal that we missed and that ca be maybe usefull

If more information is needed we can provide it.

Best regards,

[SergioFLORIDA]

Dear @Ivan_Puškaš_EC 

I am the Global Product Manager of Sepam ranges, thank for sharing the details information.

I got the message you have post and I am sharing with R&D team.

Let us analise it, in case we need aditional information, you will receive a contact from Schneider Electric.

Best Regards,

Florida

[SergioFLORIDA]

Dear @Ivan_Puškaš_EC 

I have send you a private message to request aditional information about topic.

Could you check if you received the message into PRIVATE section?

Best Regards,

FLORIDA

[Ivan_Puškaš_EC]

Dear @SergioFLORIDA 

Thank you for investigation.

I will send you all that you asked in PVT message.

BR

[Ivan_Puškaš_EC]

@SergioFLORIDA 

Thanks for the help.

While we are waiting for the experts answer...

Can someone explain meaning of these signals in Sepam:

For GOOSE messaging (CET850)

- Quality status: QD Value of the "quality of data" flag for that message

- Quality status: QR Value of the "quality of reception" flag for that message

For those signals it is not clear for me what is the right meaning and use for them.

As "GOOSE input assignment" in drop down list in Sepam settings - GOOSE (SFT2841) 

- GOOSE indication - as GOOSE input in Sepam

- GOOSE reception Fault - as GOOSE input in Sepam

And for this signals I cant find any explanation in manuals that I have or that I found online.

Best regards

[ChristopheCasa]

Hello,

I can not help too much but some information about the Quality status.

In normal operation, QR and QD should always equal to 0. Here below is an extract of the manual

• QR: Quality Reception
  If at run time the QR attribute is set to1, this means that the GOOSE message was not received in the expected time.
• QD: Dataset consistency
  If at run time the QD attribute is set to 1, this means that the structure of the GOOSE message is not as expected at subscription time.

So you can monitor QR and QD to detect a problem on a goose (not received or not well-formed)

[Ivan_Puškaš_EC]

Just to complete the topic:

QR: Quality Reception, in SFT2841 setting this signal is named "GOOSE reception fault"

QD: Dataset consistency. in SFT2841 setting this signal is named "GOOSE reception indicator"

BR

[AndreMelo · Accepted solution]

@Ivan_Puškaš_EC 

I not sure if you got it done already but I just saw this post. For sepam you must assign the goose quality in a separate goose input to avoid this issue, when goose quality goes bad.

At the CET850 it will display to you the stVal and q separately, you should assign each one in a separately Gx0x input and do an AND with these two signals via Logic as following:

Best Regards