Ethernet Redundancy - ABB 615 series Technical Manual

Hide thumbs Also See for 615 series:

Table of Contents

1MAC059074-MB A

615 series ANSI

Technical Manual

Ethernet redundancy

IEC 61850 specifies a network redundancy scheme that improves the system availability

for substation communication. It is based on two complementary protocols defined in the

IEC 62439-3:2012 standard: parallel redundancy protocol PRP and high-availability

seamless redundancy HSR protocol. Both protocols rely on the duplication of all

transmitted information via two Ethernet ports for one logical network connection.

Therefore, both are able to overcome the failure of a link or switch with a zero-switchover

time, thus fulfilling the stringent real-time requirements for the substation automation

horizontal communication and time synchronization.

PRP specifies that each device is connected in parallel to two local area networks. HSR

applies the PRP principle to rings and to the rings of rings to achieve cost-effective

redundancy. Thus, each device incorporates a switch element that forwards frames from

port to port. The HSR/PRP option is available for all 615 series protection relays.

However, RED615 supports this option only over fiber optics.

IEC 62439-3:2012 cancels and replaces the first edition published in

2010. These standard versions are also referred to as IEC 62439-3 Edition

1 and IEC 62439-3 Edition 2. The protection relay supports IEC

62439-3:2012 and it is not compatible with IEC 62439-3:2010.

Each PRP node, called a double attached node with PRP (DAN), is attached to two

independent LANs operated in parallel. These parallel networks in PRP are called LAN

A and LAN B. The networks are completely separated to ensure failure independence, and

they can have different topologies. Both networks operate in parallel, thus providing zero-

time recovery and continuous checking of redundancy to avoid communication failures.

Non-PRP nodes, called single attached nodes (SANs), are either attached to one network

only (and can therefore communicate only with DANs and SANs attached to the same

network), or are attached through a redundancy box, a device that behaves like a DAN.

615 series overview

Table of Contents