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Communication networks and systems in substations
All 14 parts of IEC 61850
Newly-made (July 2004):
All 14 parts of the standard IEC 61850 have been approved as International Standards! The standards have been approved by the majority of almost 100 per cent. The standard IEC 61850 is now completed! The stable contents of the parts IEC 61850-7-x, the mappings to protocols and the configuration language are the basis for the final draft version of part 10 (Conformance testing) which is expected for mid 2004.
Alle Teile der 14-teiligen Normenreihe IEC 61850 sind als internationale Normen angenommen worden! Zuletzt wurden die für den Betrieb einer Schaltanlage wichtigen Teile IEC 61850-8-1 (Stationsbus auf Ethernet) und Teil 6 (Engineering) mit überwältigender Zustimmung als International Standard angenommen.
Part IEC 61850-5 "Communication requirements" has been published as IEC Standard
Part IEC 61850-6 "Configuration language" has been approved for publication as IEC Standard
Part FDIS IEC 61850-8-1 "Mapping of services (SCSM) to MMS (ISO/IEC 9506 Part 1 and Part 2) over ISO 8802-3" has been approved for publication as IEC Standard
Part FDIS IEC 61850-9-2 "Mapping - Sampled values over ISO/IEC 8802-3" has been approved for publication as IEC Standard
The IEC has this week (May 11-17, 2003) published five new parts in the IEC 61850 series of standards (Communication networks and systems in substations):
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Introduction IEC 61850
Dealing with automation systems, it offers a seamless communication solution for electric substations and the basis for decentralized power generation, e.g. for wind power plants (standard under preparation: IEC 61400-25).
Deregulation of the energy markets is expanding at an ever faster pace these days, the consequences being increasing competition among utilities. Closed energy management systems are no longer sufficient. Communication and exchange of information with external systems are a necessity for the planning, operation and maintenance of power systems, as well as for the business side dealing with power transmission and distribution. Equipment and systems have to be interoperable, and interfaces, protocols and data models must be compatible to optimize to use of the power system in the energy market.
IEC 61850 provides:
for the following applications:
Thanks to the seamless real-time communication system based on IEC 61850, future power systems will be smart at the top and smart at the bottom and self-regulated by millions of communicating intelligent electronic devices (IED) connected to optimize the complete chain from power generation to customers. All critical information about the power system will be consistently available at any time and anywhere when making control decisions.
Users and vendors benefit from the standard in a similar manner because IEC 61850:
Parts just published (May 11-17, 2003):
IEC 61850-7-2 (2003-05) order information
Communication networks and systems in substations - Part 7-2: Basic communication structure for substation and feeder equipment - Abstract communication service interface (ACSI)
The communication means defined in IEC 61850-7-2 allow the exchange of all process related information (sampled value exchange, fast peer-to-peer process data exchange, edit setting groups, control devices, report events (sequence-of-events), and log events historically) and the online exchange of all configuration information. The services are defined in an abstract way, that means they need to be mapped to a specific application layer protocol (e.g., ISO 9506 - Manufacturing Message Specification, MMS). The mapping to MMS, TCP/IP, and Ethernet is defiend in IEC 61850-8-1. IEC 61850-7-2 provides services for all known and crucial applications in substations. The services are independent of the information models. They can be applied in many other application domains, e.g., in the distributed power generation domain.
IEC 61850-7-3 (2003-05) order information
Communication networks and systems in substations - Part 7-3: Basic communication structure for substation and feeder equipment - Common data classes example CDCs
The several hundred data classes defined in IEC 61850-7-4 are based on a few very common templates (the common data classes, CDC) to specify their content. Some 30 CDC are defined that fall into the following groups: status information, measured information, controllable status information, controllable analogue set point information, status settings, and analogue settings. Each logical node in IEC 61850-7-4 is defined by a name (e.g., XCBR - for circuit breaker) and a list of many data classes. Each data class has a name (e.g., Pos - breaker position of the XCBR). The data have many named attributes defining details of the value like timestamp, quality, substitution, SI unit, deadband, description). These details are defined in the common data class (e.g., DPC - controllabe double point).
The data derived from a specific data class describes the data completly: with regard to all details and the communication services that can be processed by that data. The CDCs link the data defined in IEC 61850-7-4 with the information exchange services contained in IEC 61850-7-2.
Almost all common data classes may be used in many application domains outside the substation domain. IEC 61850-7-3 is a key specification because it is the foundation of the information model (comprises process and meta data).
IEC 61850-7-4 (2003-05) order information
Communication networks and systems in substations - Part 7-4: Basic communication structure for substation and feeder equipment - Compatible logical node classes and data classes list of logical nodes and example: "XCBR" - circuit breaker
Provides a set of modules of a comprehensive substation specific information model (e.g. for Automatic Control, Supervisory control, Metering and Measurement, Protection Functions, Sensors, Monitoring, Instrument Transformer, Switchgear). Some 100 modules (the logical nodes) comprise function related information (so-called data classes) and represent all common semantic intelligent electronic devices (IEDs) used in substations. The standard defines some 500 data classes to support the development of compatible devices - independent of the vendor. The standard will be used - in conjunction with the configuration language (IEC 61850-6) - to design devices that can openly communicate with each other . Devices having implemented these models - in conjunction with the communication means defined in IEC 61850-7-2 - can exchange all function related information (sampled values, fast peer-to-peer process data, editable settings, control commands , event reports (sequence-of-events), and logged information, configuration data) online. All data classes used are based on common data classes (CDC), which are defined in IEC 61850-7-3.
The information model reduces the efforts (time and money) to design, implement, engineer, maintain, and operate IEDs.
IEC 61850-9-1 (2003-05) order information
Communication networks and systems in substations - Part 9-1: Specific Communication Service Mapping (SCSM) - Sampled values over serial unidirectional multidrop point to point link
With IEC 61850-9-1, a global standard for a digital interface especially for non conventional voltage and current transformers is now available. IEC 61850-9-1 describes a serial point to point communication link used to transmit the sampled values from instrument transformers to protection relays, control and metering devices of a substation automation system. The communication link is realised by Ethernet with priority tagging according to IEEE 802.1p/Q.
When using non conventional intrument transformers like rogowski coils or optical sensor systems, digital interfaces according to IEC 61850-9-1 will replace the 100V / 5A analog interface used so far with conventional instrument transformers.