© ABB - Page 1 Free Configuration The standard shall support different philosophies and allow a free allocation of functions e.g. it will work equally well for centralized (RTU like) or decentralized (SCS like) systems. Interoperability The ability for IED’s from one or several manufacturer to exchange information and use the information for the their own functions. Long Term Stability The standard shall be future proof, i.e. it must be able to follow the progress in communication technology as well as evolving system requirements. The goal of the IEC standard

© ABB - Page 2 WDCDFDISCDV IS FDIS under preparation Configuration Part 6:Configuration Lan- guage for electrical Substation IED’s Testing Part 10:Conform. Testing Mapping to real Comm. Networks (SCSM) Part 8-1: Mapping to MMS Part 9-1: Serial Unidirectional Multidrop Point-to- Point link Part 9-2: Mapping on Ethernet based Process Bus Data Models Basic Communication Structure for Substations and Feeder Equipment Part 7-4: Compatible Logical Node Classes and Data Classes Part 7-3: Common Data Classes Abstract Comm. Services Basic Communication Structure for Substations and Feeder Equipment Part 7-2: Abstract Communication Services (ACSI) Part 7-1: Principles and Models System Aspects Part 1: Introduction and Overview Part 2: Glossary Part 3: General Requirements Part 4: System and Project Management Part 5: Comm Requirements for Functions and Device Models The Contents of IEC State: August 2002

© ABB - Page 3 Circuit Breaker Q0_L1/XCBR Gas density mon. Q0_L1/SIMS Primary technology Secondary technology Control Q0/CSWI Q8/CSWI Q9/CSWI Bay-HMI IHMI Isolator Q9_L1/XSWI Gas density mon. Q9_L1/SIMS Earthing Switch Q8_L1/XSWI Gas density mon. Q8_L1/SIMS Distance Protection PDIS The data model is process oriented...

© ABB - Page 4 Local operationmandatory Switch positionmandatory Operation capabilitymandatory Operation counteroptional … Circuit Breaker XCBR The objects are the functions, that the user needs and knows from everyday experience. They are called “Logical Nodes” in the standard. For example XCBR with all defined data: Mandatory and optional Data are associated with all objects Access to object and data is standardized (Services) The Objects and Data are self describing IEC defines objects, data and services

© ABB - Page 5 Application Domain Substation Application Objects Services Mapping ISO/OSI seven layer stack Communication Technology Abstract Interface Stack Interface Approach of IEC61850 The Data model is mapped unambiguously to an existing stack Adaptation per selected stack Long-term definition Safe-guarding investments Stack selection following state-of-art Communication technology Slow Fast MMS TCP/IP Ethernet From function (application) to communication