High-Availability Seamless Redundancy (Hsr) - GE 350 Communications Manual

350 REDUNDANCY OPTIONS

350 High-availability Seamless Redundancy (HSR)

3-4
350relays implement only the DANP functionality. The RedBox functionality is not
implemented.
The original standard IEC 62439-3 (2010) was amended to align PRP with the High-
availability Seamless Redundancy (HSR) protocol. To achieve this, the original PRP was
modified at the cost of losing compatibility with the PRP 2010 version. The revised
standard IEC 62439-3 (2012) is commonly referred to as PRP-1, while the original standard
is PRP-0. 350 relays support only PRP-1.
PRP can be enabled in configuration through a setting available on the network
configuration menu, REDUNDANCY, which already has the capability of enabling Failover
redundancy. When REDUNDANCY is set to PRP, the ports dedicated for PRP will operate in
redundant mode.
The rights associated with configuring PRP follow the security requirements for network
configuration.
PRP management through SNMP MIB is not supported, as the 350 relay doesn't currently
support SNMP for configuration. Settings and actual values are only available through the
front panel and through EnerVista.
The PRP solution to implemented must ensure that performance requirements stated in
IEC 61850-5 Clause 13 are still met. It is specified under Clause 13 (Message performance
requirements) that messages of type 1A must meet the performance class P2/3, which is
3ms (See 3.7.1.1).
Each device in the daisy chain forwards the message until it reaches the destination.
HSR defines a redundancy protocol for high availability in substation automation
networks, based on PRP principles, provides the property of zero recovery time, typically
used in ring topology but applicable to any topology.
In the 350 relay, HSR is implemented in devices with communication option number 5 and
it has two fiber optics. A frame is sent over both ports. A destination should receive, in the
fault-free state, two identical frames within a certain time skew, forward the first frame to
the application and discard the second frame when (and if) it comes. A sequence number
is used to recognize such duplicates.
In contrast to PRP (IEC 62439-3- Clause 4), with which it shares the operating principle, HSR
nodes are arranged into a ring, which allows the network to operate without dedicated
switches, since every node is able to forward frames from port to port. HSR originally
meant "High-availability Seamless Ring", but HSR is not limited to a simple ring topology.
Redundant connections to other HSR rings and to PRP networks are possible.
SR3 SERIES PROTECTIVE RELAY PLATFORM – COMMUNICATIONS GUIDE
CHAPTER 3: ETHERNET INTERFACE