It is of the interest how GOOSE communication failure signal is generated and how this signal can be used in configurable logic of an IED.As far as I understand GOOSE-messages are sent periodically even if there are no status changes. And in case if status change occurs, generation of GOOSE-messages occurs with shorter time intervals, increasing up to constant value T0 which is retransmission time for steady state. Here the following questions arise:
What happens if timeAllowedtoLive time interval has elapsed?
Does the subscriber set all the values to default when timeAllowedtoLive time interval has elapsed?
How GOOSE-communications failure is detected? Which data object/attribute or service facilitates in detection of the failure?
Is it reasonable to implement the following logic: Besides the required data, include constant value (BOOLEAN type) in a transmitted dataset. Assign True value for this constant. Detect the value at the subscriber’s side. If the value goes to FALSE (reset to default value on GOOSE-communication failure) on subscriber’s side, can this be used to identify GOOSE-communications failure?
Please, let me know if there are any misunderstandings in my view. Thanks in advance.