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IEC 61850 Communication Networks and Systems In Substations: An Overview for Users

Drew Baigent. Mark Adamiak. Ralph Mackiewicz. GE Multilin. GE Multilin. SISCO, Inc. Markham, Ontario. King of Prussia, PA. Sterling Heights, MI. IEC 61850 Communication Networks and Systems In Substations: An Overview for Users. SIPSEP 2004 Monterrey, Nuevo León, México

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IEC 61850 Communication Networks and Systems In Substations: An Overview for Users

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  1. Drew Baigent Mark Adamiak Ralph Mackiewicz GE Multilin GE Multilin SISCO, Inc. Markham, Ontario King of Prussia, PA Sterling Heights, MI IEC 61850 Communication Networks and Systems In Substations:An Overview for Users SIPSEP 2004 Monterrey, Nuevo León, México Miércoles 10 de Noviembre, 2004

  2. ComprehensiveEPRI-Project UCA 2.0 GOAL: One International Standard IEC 60870-5-101, -103, -104 European experience IEC61850 and UCA2 IEC 61850

  3. Station Bus - - 10/100/1000 MB Ethernet 10/100/1000 MB Ethernet Remote Remote Relay IED Relay(s) Relay(s) Relay IED Relay IED Subscribe to Subscribe to Access Access Datasets Datasets Process Bus Network Network MU Publishes MU Publishes .1/1/10GB .1/1/10GB V/I/Status V/I/Status Datasets Datasets Ethernet Ethernet Clk1 Clk1 Clk2 Clk2 MU MU MU MU MU MU PT1 PT1 PT2 PT2 Optical Optical I/O I/O I/O I/O I/O I/O Optical Optical CT2 CT2 Optical Optical PT PT CT CT CT CT MU = Merging Unit MU = Merging Unit IEC61850 Substation Architecture

  4. IEC61850 Standard Part 1 Basic principles Part 2 Glossary Part 3 General Requirements Part 4 System and project management Part 5 Communication requirements Part 6 Substation Automation System Configuration Part 7 Basic Communication Structure Mapping to MMS and Ethernet Sampled Measured Values Part 8 Part 9 Mapping to Ethernet Part 10 Conformance testing

  5. IEC61850 – Primary Parts • Part 6-1: Substation Configuration Language (SCL) • Part 7-2: Abstract Communications Service Interface (ACSI) and base types • Part 7-3: Common Data Classes (CDC) • Part 7-4: Logical Nodes • Part 8-1: Specific Communications Service Mappings (SCSM) - MMS & Ethernet • Part 9-2: SCSM - Sampled Values over Ethernet • Part 10-1: Conformance Testing

  6. Name ObjectName ObjectReference 1 1 1 1 1..* 1..* 1..* 1..* IEC61850 Class Model Physical Device: access by network address SERVER Enables data from multiple devices to be aggregated into a single physical device (data concentrator) LOGICAL-DEVICE LOGICAL-NODE DATA DataAttribute

  7. Logical Nodes • A named grouping of data and associated servicesthat is logically related to some power system function. dddXCBR1 Logical Node Instance # Logical Node Name per IEC 61850-7-4 (breaker) Optional Application Specific Prefix

  8. IEC61850-7-4 Logical Nodes

  9. Logical Node Description - XCBR SPS Mandatory/Optional Common Data Class Description Data Name

  10. Single Point Status (SPS) CDC(e.g. loc) stVal Attribute Name Mandatory/ Optional Type Range of Values Functional Constraint

  11. Relay1/XCBR1$ST$Loc$stVal Attribute Data Functional Constraint Logical Node Logical Device Object Name Structure

  12. ACSIAbstract Communications Service Interface • Defines a set of Objects • Defines a set of Services to manipulate and access those objects • Defines a base set of data types for describing objects

  13. ACSI Objects

  14. ACSI Services Enable Self Describing Devices

  15. Reporting Features • Unbuffered Reporting is equivalent to UCA2 reports • Buffered reporting enables the server to retain data if associations are lost enabling the client to retrieve ALL data.

  16. Relay-Relay Messaging GSSE: Generic Substatation Status Event GOOSE: Generic Object Oriented Substation Event 128 status bit pairs InformationReport Data set containing named values and status OSI Connectionless Non-Routable Profile Ethernet Multicast Address Ethernet Multicast Address Published to all devices subscribed to data on multi-cast address Published to all devices subscribed to data on multi-cast address (UCA GOOSE)

  17. GOOSE/GSSE is Reliable Multicast NON-EXISTENT New State: 1.Sequence Number = 0 2.State Number++ 3. Reset HoldTimer RETRANSMIT- PENDING 1. Hold Time Preset ++ 2. Start Hold Timer 3. Sequence Number ++ HoldTime expired SEND Message

  18. SCL – Substation Configuration LanguageIEC61850-6-1 • Description language for communication in electrical substations related to the IEDs • XML based language that allows a formal description of • Substation automation system and the switchyard and the relation between them • IED configuration

  19. SCL File Types • SSD: System Specification Description. XML description of the entire system. • SCD: Substation Configuration Description. XML description of a single substation. • ICD: IED Capability Description. XML description of items supported by an IED. • CID: Configured IED Description. XML configuration for a specific IED.

  20. Sampled Measured Values • A method for transmitting sampled measurements from transducers such as CTs, VTs, and digital I/O. • Enables sharing of I/O signals among IEDs • Supports 2 transmission methods: • Multicast service (MSVC) over Ethernet • Unicast (point-to-point) service (USVC) over serial links.

  21. SMV Application

  22. IEC61850 Controls • 4 Control Models: • Direct Control with normal security • SBO Control with normal security • Direct Control with enhanced security • SBO Control with enhanced security • Enhanced Security provides validation and supervision of the control action and reporting of status.

  23. IEC61850 Profiles

  24. Relationship to UCA2 CASM IEC 61850-7-2(Services and basedata types) IEC 61850-8-1(Mapping to MMS) IEC 61850-7-3(Common Data Classes) GOMSFE Bricks IEC 61850-7-4(Logical Nodes)

  25. UCA2.0 GOMSFE CASM Brick GOOSE IEC61850 CDC ACSI Logical Node Generic Substation Status Event (GSSE) Terminology

  26. Data Object Model Data Set Model Association Model Server Model Unbuffered Reporting Model Security Model Time Model Direct and SBO Control GSSE (called GOOSE in UCA2) Data Object Model Data Set Model Association Server Unbufferedand Buffered Reporting No explicit Security Time Direct, SBO, enhanced Control GOOSE, GSSE, and GSE Management UCA2 vs. 61850 Object Models

  27. UCA2  IEC61850 Migration • UCA2.0 is mostly a subset of IEC61850. • Some additional services and objects. • Some object changes. • IEC61850 uses SNTP for networked time synch. • An IEC61850 client can be compatible with both UCA2 and IEC61850.

  28. Benefits of IEC61850 SIPSEP 2004 Communications Panel Session Ralph Mackiewicz SISCO, Inc. ralph@sisconet.com

  29. Keys to Obtaining Benefits • Requires a view of cost beyond just the purchase price. • The benefit of an IEC61850 device is not in the price of the device: Benefit is in lower cost to use the device. • The benefit of an IEC61850 system is not in buying the system: Benefit is in lower costs to start and use the system.

  30. IEC61850 is Unique • Not a recast serial RTU protocol • Designed specifically for LANs to lower life cycle cost to use a device: • Cost to install, configure, and maintain • Real object-oriented approach for SA: • Supports standardized device models using names instead of object/register numbers and indexes. • Standardized configuration language (SCL). • Feature rich with support for functions difficult to implement otherwise.

  31. IEC61850 Network Architecture • Data from IEDs available to all applications via network. • Communications unaffected when adding devices or applications. • Standard net. gear provides high perf. & flexibility with environmental protection. • Applications and IEDs share common: • Protocols • Data Format and Context • Data Addressing/naming Conventions • Configuration Language

  32. IEC61850 View of Devices • Only network addressing requires configuration in the remote client. • Point names portray the meaning and hierarchy of the data. • Point names can be retrieved from the device automatically without manual intervention. • All devices share a common naming convention. • Device configurations can be exchanged using IEC61850-6-1 (SCL) files

  33. Benefits of IEC61850 • High-level services enable self-describing devices & automatic object discovery saving $$$$$ in configuration, setup and maintenance. • Standardized naming conventions with power system context eliminates device dependencies and tag mapping saving $$$$ in config., setup, and maintenance. • Standardized configuration file formats enables exchange of device configuration saving $$$$ in design, specification, config., setup, and maint.

  34. Benefits of IEC61850 • Higher performance multi-cast messaging for inter-relay communications enables functions not possible with hard wires and save $$$$ in wiring and maintenance. • Multi-cast messaging enables sharing of transducer (CT/PT) signals saving $$$$ by reducing transducers and calibration costs.

  35. Justification

  36. Thank You Ralph Mackiewicz SISCO, Inc. 6605 19½ Mile Road Sterling Heights, MI 48314-1408 USA Tel: +586-254-0020 x103 Fax: +586-254-0053 E-Mail: ralph@sisconet.com Complete presentations and papers will be posted at: http://www.sisconet.com/techinfo.htm

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