Chronology Of Class 1 Events; Class 1 Data Message Priorities - ABB Relion 615 series Manual

Section 3
Vendor-specific implementation
3.3.2.4
3.3.2.5
16
There are four setting parameters related to the IEC 60870-5-103 Class 1 overflow
operation in the IED. The setting parameters are located via LHMI path
Configuration/Communication/IEC 60870-5-103 (parameter suffix n = 1 or 2,
depending on the instance):
• Class1OvInd n: takes the overflow object into use. Settings: No indication,
Both edges, Rising edge.
• Class1OvFType n: defines the Function Type (FUN) for the overflow indication.
• Class1OvInfNo n: defines the Information Number (INF) for the overflow
indication.
• Class1OvBackOff n: defines how many events have to be emptied from the
Class 1 event buffer until new ones are collected. Default setting is 500
(meaning the whole event buffer must be emptied).
The overflow operation preserves the oldest events in the buffer. The overflow
Class 1 event is given the time stamp of the indication that first created the
overflow situation.

Chronology of Class 1 events

In some special cases it is possible that Class 1 events can be transmitted in a
wrong chronological order. However, this never occurs for the same object and the
time stamps for all Class 1 events are always correct. Reason for the disorder can
be the filtering time of a physical digital input, or suppressing of the intermediate
state of four-pole objects. Event detection time and reporting time are different in
these cases.

Class 1 data message priorities

1. User command responses (highest priority)
2. Class 1 change events
3. Disturbance file transfer messages
4. General interrogation data responses (lowest priority)
Disturbance file transfer degrades the overall response time for Class 1 change
events on the IEC 60870-5-103 interface. The standard does not suggest any
particular priority division between these two message types. It is therefore, in 615
series, possible to configure the priority division between the Class 1 change events
and disturbance file transfer messages. There are three possible priority levels:
• Ev High: Class 1 change events has higher priority.
• Ev/DR Equal: Priority is equal between the two message types.
• DR High: Disturbance file transfer has higher priority.
The setting parameter for the priority level is located via LHMI Configuration/
Communication/IEC 60870-5-103/Class1Priority n. Default level is Ev High.
1MRS756710 C
615 series
Communication Protocol Manual