Self-Healing Ethernet Ring - ABB RELION 620 Series Technical Manual

Section 2
620 series overview
2.5.1
50
The protection relay utilizes Ethernet communication extensively for different purposes.
The exact services depend on the ordered product variant and enabled functionality.
Table 6: TCP and UDP ports used for different services
Service
IEC 61850
MODBUS
DNP
FTP
HTTP
The IEC 61850 communication implementation supports all monitoring and control
functions. Additionally, parameter setting and DFR records can be accessed using the IEC
61850 protocol. Oscillographic files are available to any Ethernet-based application in the
standard COMTRADE format. The protection relay can send and receive binary signals
from other devices (so called horizontal communication) using the IEC 61850-8-1
GOOSE profile, where the highest performance class with a total transmission time of 3
ms is supported. Further, the protection relay supports sending and receiving of analog
values using GOOSE messaging. The protection relay meets the GOOSE performance
requirements for tripping applications in distribution substations, as defined by the IEC
61850 standard. The protection relay can simultaneously report events to five different
clients on the station bus.
The protection relay can support five simultaneous clients. If PCM600 reserves one client
connection, only four client connections are left, for example, for IEC 61850, DNP3 and
Modbus. Only one DNP3 client can be supported at a time.
All communication connectors, except for the front port connector, are placed on
integrated optional communication modules. The protection relay can be connected to
Ethernet-based communication systems via the RJ-45 connector (100Base-TX) or the
fiber-optic LC connector (100Base-FX).

Self-healing Ethernet ring

For the correct operation of self-healing loop topology, it is essential that the external
switches in the network support the RSTP protocol and that it is enabled in the switches.
Otherwise, connecting the loop topology can cause problems to the network. The
protection relay itself does not support link-down detection or RSTP. The ring recovery
process is based on the aging of the MAC addresses, and the link-up/link-down events can
cause temporary breaks in communication. For a better performance of the self-healing
loop, it is recommended that the external switch furthest from the protection relay loop is
assigned as the root switch (bridge priority = 0) and the bridge priority increases towards
the protection relay loop. The end links of the protection relay loop can be attached to the
1MAC504801-IB E
Port
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Technical Manual
620 series ANSI