17 Comprehensive EPRI-Project UCA 2.0 GOAL: One International StandardIEC 61850IEC , -103, -104European experience
18 What is IEC ?IEC is NOT just a communication protocolIt is a suite of multiple protocolsIt is an application focused communication architectureIt is one of the key building blocks for the Smart GridIEC standard defines complete communication architecture in Electrical Power System
21 IEC61850 – Primary PartsPart 6-1: Substation Configuration Language (SCL)Part 7-2: Abstract Communications Service Interface (ACSI) and base typesPart 7-3: Common Data Classes (CDC)Part 7-4: Logical NodesPart 8-1: Specific Communications Service Mappings (SCSM) - MMS & EthernetPart 9-2: SCSM - Sampled Values over EthernetPart 10-1: Conformance Testing
22 SCL – Substation Configuration Language IEC61850-6-1 Description language for communication in electrical substations related to the IEDsXML based language that allows a formal description ofSubstation automation system and the switchyard and the relation between themIED configurationCommunication parametersEases the integration process of devices from multiple vendors
23 CID: Configured IED Description. XML configuration for a specific IED. SCL File TypesSSD: 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.
24 System Specification Description ( SSD ) Description the single line diagram and the substation automation functionaly using the associated logical nodesSingle line diagram connectionsLogical nodes , Logical node type
29 ACSI Abstract Communications Service Interface Abstract interface describing communications between a client and a remote server for:real-time data access and retrieval,device control,event reporting and logging,file transferDefines a set of Objects
30 ACSI Abstract Communications Service Interface This part of IEC may also be applied to describe device models and functions for additional activities, such as:substation to substation information exchange,substation to control centre information exchange,power plant to control centre information exchange,information exchange for distributed generation, orinformation exchange for metering.
32 Logical NodesA named grouping of data and associated services that is logically related to some power system function.dddXCBR1Logical Node Instance #Logical Node Name perIEC (breaker)Optional Application Specific Prefix
33 IEC61850-7-4 Logical Nodes Name Description Axxx Automatic Control (4). ATCC (tap changer), AVCO (volt. ctrl.), etc.CxxxSupervisory Control (5). CILO (Interlocking), CSWI (switch ctrl), etc.GxxxGeneric Functions (3). GGIO (generic I/O), etc.IxxxInterfacing/Archiving (4). IARC (archive), IHMI (HMI), etc.LxxxSystem Logical Nodes (2). LLN0 (common), LPHD (Physical Device)MxxxMetering & Measurement (8). MMXU (meas.), MMTR (meter.), etc.PxxxProtection (28). PDIF, PIOC, PDIS, PTOV, PTOH, PTOC, etc.RxxxProtection Related (10). RREC (auto reclosing), RDRE (disturbance)..SxxxSensors, Monitoring (4). SARC (archs), SPDC (partial discharge), etc.TxxxInstrument Transformer (2). TCTR (current), TVTR (voltage)XxxxSwitchgear (2). XCBR (breaker), XCSW (switch)YxxxPower Transformer (4). YPTR (transformer), YPSH (shunt), etc.ZxxxOther Equipment (15). ZCAP (cap ctrl), ZMOT (motor), etc.WxxxWind (Set aside for other standards)OxxxSolar (Set aside for other standards)HxxxHydropower (Set aside for other standards)NxxxPower Plant (Set aside for other standards)BxxxBattery (Set aside for other standards)FxxxFuel Cells (Set aside for other standards)
34 Logical Node Description - XCBR SPSMandatory/OptionalCommon Data ClassDescriptionData Name
35 Single Point Status (SPS) CDC (e.g. loc) stValAttributeNameMandatory/OptionalTypeRange ofValuesFunctionalConstraint
36 Relay1/XCBR1$ST$Loc$stVal Object Name StructureRelay1/XCBR1$ST$Loc$stValLogical DeviceLogical NodeFunctional ConstraintDataAttribute
37 Mapping logical nodes, classes, and data concepts to the real world
42 IEC 61850 GOOSE Device to multi-device communication Fast transmission of substation events, blocking, permissive signals, etc.Also transmission of analog values ( voltage, current, frequency, etc.)Event driven transmission sent on change of stateInterlockingIndication
49 IEC 61850 Network Architecture Relays share a common network making sophisticated protection schemes possible.Number of links for N relays is N and shared with SCADA.Relays send their status to all other relays at once using GOOSE.Status exchanged continuously.High performance.
50 Benefits Reduction of wiring costs More flexible programming is independent of wiringReliability: Link status known before use.New capabilities not cost-effective with hardwired systems.Higher performance with more data.
56 Legacy ApproachIndividually and redundantly wired to all devices needing the same signals:CTsPTsStatus InputsOutputsEach individual sensor must be calibrated and maintained separately.Incremental cost is exponential (signals x devices)Result is minimization of I/O
58 IEC Process BusTransducer and I/O signals are shared via a network.Only one transducer or I/O point per signal.Minimization of calibration and maintenance.Incremental cost is linear (signals only)Future: Integrated MU with digital fiber optic transducers
60 Benefits of IEC61850High-level services enable self-describing devices & automatic object discovery saving $$$$$ in configuration, setup and maintenance.Standardized naming conventions with power system context eliminates device dependencies and tag mapping saving $$$$ in config., setup, and maintenance.Standardized configuration file formats enables exchange of device configuration saving $$$$ in design, specification, config., setup, and maint.
61 Benefits of IEC61850Higher performance multi-cast messaging for inter-relay communications enables functions not possible with hard wires and save $$$$ in wiring and maintenance.Multi-cast messaging enables sharing of transducer (CT/PT) signals saving $$$$ by reducing transducers and calibration costs.