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Understanding IEC 61850 Communication Protocols for High Voltage Applications

This document provides an overview of the IEC 61850 communication protocols, focusing on the application processes and the significance of client/server and peer-to-peer communication models. It highlights specific services like GOOSE and sampled values, which are critical for time-sensitive data transmission in high voltage equipment. Protocols such as MMS and data transmission over TCP/IP are discussed, emphasizing their importance in ensuring reliable communication within substations. Key aspects include priority tagging and the implications for protection and control systems at various hierarchical levels.

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Understanding IEC 61850 Communication Protocols for High Voltage Applications

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  1. Communication protocols ApplicationProcess Network independent Interface ACSIAbstract Comm.Service Interface SCSM 1 SCSM 2 SCSM n Specific Comm. Service Mapping Specific Interface AL 1 AL 2 AL n Application Layer 7 Layer 1..6

  2. Peer to peer communication; time critical Client / Server communication reports req / rsp req / rsp GOOSE MessageSampled Values multicast Communication concepts Physical Device Physical Device ACSI Client ACSI Server Data Data Data • Applications of "peer-to-peer" communication • tripping of circuit breakers: short information that needs to be transmitted with a low probability of loss within a few milliseconds • transmission of sampled values from instrumental transformers: high amount of data, to be transmitted within a few milliseconds, loss of data needs to be detected Application Physical Device ACSI Server Data Data Data Physical Device Application Application

  3. Communication stack Application ACSI GOOSE Samples Client / Server Services MMS ASN.1 ISO Session RFC 1006 TCP IP EthType EthType EthType Ethernet II Priority tagging 802.1p/802.1Q

  4. 61850-8-1 61850-9-2 HV Equipment HV Equipment 61850-9-1 Interface model Technical Services 7 Station Level 9 Function B Function A 1 6 1 6 Bay Level Bay Level 3 8 3 Protection Control Protection Control 4 5 4 5

  5. System overview IEC 61850-8-1 IEC 61850-9-x

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