ABB UniGear Series, Engineering Manual

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66 1VLG5 00007 E
SINGLE network
+ RSTP
PRP networks HSR network
Data loss Yes No No
ECONOMICS
Equipment costs
Medium, Ethernet
switches
High, double amount of
Ethernet switches, pro-
tection relay with more
interfaces
Medium, Redbox, protec-
tion relay with more in-
terfaces
Communication Links
Medium, links between
protection relays and
Ethernet switches
High, double links be-
tween protection relays
and Ethernet switches
Low, only links between
protection relays
Space requirements
Medium, Ethernet
switches
High, Ethernet switches Low, less devices
ENGINEERING
Effort Less More Less
3.5.4 Ethernet traffic estimation
MMS 0.01 Mbps per a single protection relay
GOOSE 0.1 Mbps in burst conditions per a single protection relay (2 data sets)
SMV 5 Mbps per a source protection relay
Fast Ethernet = 100 Mbps
The bandwidth of the HSR ring is half of the Fast Ethernet, because each message is sent in
parallel into either direction.
For instance, estimated Ethernet traffic volume for a substation consisting of two sections
(20x GOOSE sender, 2x SMV sender) is: 20 x 0.01 + 20 x 0.1 + 2 x 5 = 12.2 Mbps
Knowledge of data flows and traffic patterns allows for detecting bottlenecks and planning
the network segmentation and segregation of traffic.