Abstract
The paper analyses and experimentally verifies deployment of Ethernet based network technology to enable fault tolerant and timely exchange of data among a number of high voltage protective relays that use proprietary serial communication line to exchange data in real time on a state of its high voltage circuitry facilitating a fast protection switching in case of critical failures. The digital serial signal is first fetched into PCM multiplexer where it is mapped to the corresponding E1 (2 Mbit/s) time division multiplexed signal. Subsequently, the resulting E1 frames are then packetized and sent through Ethernet control LAN to the opposite PCM demultiplexer where the same but reverse processing is done finally sending a signal into the opposite protective relay. The challenge of this setup is to assure very timely delivery of the control information between protective relays even in the cases of potential failures of Ethernet network itself. The tolerance of Ethernet network to faults is assured using widespread per VLAN Rapid Spanning Tree Protocol potentially extended by 1+1 PCM protection as a valuable option.
Highlights
The foreseen concept of Smart Grid technology, which promises highly efficient and dynamic energy systems in Europe, has to be backed by suitable information and communication system
The basic Ethernet technology is well suited for supporting the data transfer for classical information techc 2013 ADVANCES IN ELECTRICAL AND ELECTRONIC ENGINEERING
The reason for that behavior can be attributed to how multiple control messages of RSTP are processed inside the switches
Summary
The foreseen concept of Smart Grid technology, which promises highly efficient and dynamic energy systems in Europe, has to be backed by suitable information and communication system. In our work we target first choice and analyze a situation where there in Ethernet based network is deployed the per VLAN (Virtual Local Area Network) Spanning Tree Protocol (RSTP) in combination with 1+1 PCM (Pulse-code Modulation) protection scheme in addition to the dedicated primary communication line among protection relays themselves. This protocol selected was well in line with one of our practical projects we have dealt with where there was a requirement to use already existing protocol (if possible) in the network (in this case the per VLAN RSTP) and validate its practicability for the protection relay traffic in the network with multiple VLANs
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