Non-Standard Features; Gi Optimization - ABB Relion 615 series Manual

Section 3
Vendor-specific implementation
3.6
3.6.1
24
Disturbance recorder transfer verification
The IEC 60870-5-103 disturbance recorder file transfer implemented in the IED
has been verified by a third party client software. ABB does not provide any client
systems or evaluation tools for IEC 60870-5-103 disturbance data contents.

Non-standard features

The IEC 60870-5-103 protocol is defined for a single-function protection device
with limited set of functionalities. Problem that arises in a multiple functionality
IED are mainly related to the larger amount of Class 1 events typically generated
during a fault. Modern multifunctional IEDs may create up to 20-40 times more
events during a fault compared to single function devices that were the basis for the
IEC 60870-5-103 standard. IEC 60870-5-103 has some limitations:
• The protocol is defined to be used on serial interfaces (max. allowed baud rate
19200 bauds).
• The protocol can only transfer one change event per Class 1 poll.
• Unbalanced communication: the master must poll all IEDs in the network
cyclically which means that the master cannot remain polling out events from
a certain IED for a very long time, since this degrades the overall response
time from the whole substation.
RE_615 includes some possibilities to fasten up and optimize the IEC 60870-5-103
communication. However, it is necessary to verify that these features are accepted
by the network and the IEC 60870-5-103 master used.
• Remove unnecessary Class 1 objects. Even if the IED can provide a lot of
valuable information, it is not feasible to send everything on slower serial links.
• Remove falling edge events for selected Class 1 objects.
• Serial communication speed can be increased up to 115.2 kbauds. However,
observe that all IED's on a multidrop link must support the same
communication speed.
• GI data optimization which means that not all data is sent as GI data in a GI cycle.

GI optimization

The master should initiate a GI always after the IED has reported a Class 1 event
buffer overflow. The IED starts then to send GI data through the Class 1 event
buffer. As the standard defines, new events always have higher send priority than
GI data in the IED's Class 1 buffer. The standard also defines that all data that are
subject to GI is sent by the IED.
Optimization of GI data is a non-standard feature. As default the Optimize GI n
parameter (located via LHMI path Configuration/Communication/IEC
60870-5-103/GI Optimize n) is set to "Standard behaviour", meaning that the GI
1MRS756710 C
615 series
Communication Protocol Manual