—
Figure 16. High availabil-
ity seamless redun-
dancy (HSR) solution
The choice between the HSR and PRP redundancy
protocols depends on the required functionality,
cost and complexity. The self-healing Ethernet ring
solution enables a cost-efficient communication
ring controlled by a managed switch with standard
Rapid Spanning Tree Protocol (RSTP) support. The
managed switch controls the consistency of the
loop, routes the data and corrects the data flow in
case of a communication switch-over. The relays in
the ring topology act as unmanaged switches for-
warding unrelated data traffic. The Ethernet ring
solution supports the connection of up to 30 615
series relays. If more than 30 relays are to be con-
nected, it is recommended to split the network into
several rings. The self-healing Ethernet ring solu-
tion avoids single point of failure concerns and im-
proves the reliability of the communication.
Ethernet switch
Redundancy
Box
IEC 61850 HSR
Redundancy
Box
Redundancy
Box
REF615
REF620
RET620
REM620
REF615
SCADA
Devices not supporting HSR
COM600
32
R E F61 5 A N S I 5.0 FP1
FEED ER P R OT EC T I O N A N D CO N T R O L