Disturbance Recorder Transfer; Non-Standard Features - ABB RELION 620 Series Communication Protocol Manual

1MRS757647 C
3.5.4
3.6
620 series
Communication Protocol Manual

Disturbance recorder transfer

When the IEC 60870-5-103 client selects a disturbance recording to be transferred, the
corresponding disturbance recording data is internally fetched from the IED's native
disturbance recorder file, cached and converted into IEC 60870-5-103 format. This
operation may take some time depending on the size of the disturbance recorder file.
Once an IEC 60870-5-103 disturbance recorder channel or tag transmission is in
progress, it can be performed till the end, even if the native original disturbance
recorder file simultaneously is deleted from the system. Unless the IEC 60870-5-103
master does not abort the transmission.
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.

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.
The IED 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.
Vendor-specific implementation
Section 3
29