IEC 61850
HSR
SMV traffic
Backup 1588
master clock
Managed HSR
Ethernet
switch
Primary
IEEE 1588 v2
master clock
Secondary
IEEE 1588 v2
master clock
(optional)
Managed HSR
Ethernet
switch
GUID-7C56BC1F-F1B2-4E74-AB8E-05001A88D53D V5 EN
Figure 10: Example network topology with process bus, redundancy and IEEE
1588 v2 time synchronization
The process bus option is available for all 615 series protection relays equipped with
phase voltage inputs. Another requirement is a communication card with IEEE 1588
v2 support (COM0031...COM0037). However, RED615 supports this option only
with the communication card variant having fiber optic station bus ports. See the IEC
61850 engineering guide for detailed system requirements and configuration details.
2.7.4 Secure communication
The protection relay supports secure communication for WHMI and file transfer
protocol. If the Secure Communication parameter is activated, protocols require TLS
based encryption method support from the clients. In this case WHMI must be
connected from a Web browser using the HTTPS protocol and in case of file transfer
the client must use FTPS.
2.7.5 Protection communication and supervision
The communication between the relays is enabled by means of a dedicated fiber optic
communication channel. 1310 nm multi-mode or single-mode fibers with LC
connectors are used for line differential communication. The channel is used for
transferring the phase segregated current value data between the relays. The current
phasors from the two relays, geographically located apart from each other, must be
time coordinated so that the current differential algorithm can be executed correctly.
The so called echo method is used for time synchronization. No external devices such
as GPS clocks are thereby needed for the line differential protection communication.
1MRS758127 C Section 2
RED615 overview
RED615 29
Application Manual
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