01Communication

IEC 61850 StandardInteroperability for advanced protection and control applications

IEC 61850 is the new international standard for communication in substations. It enables integration of all protection, control, measurement and monitoring functions within a substation, and additionally provides the means for high-speed substation protection applications, interlocking and intertripping. It combines the convenience of Ethernet with the performance and security which is essential in substations today.

As a result of 10 years of active participation of several Schneider Electric experts in IEC and UCA working groups developing this new substation communication technology, and following successful interoperability demonstrations at CIGRE 2004 and many other events, Schneider Electric has been busy adapting its Protection (MiCOM P range) and Control (MiCOM C range) devices to support this new international standard.

The protection relays integrate with the PACiS substation control systems over the IEC 61850 8-1 Substation Bus and at the same time can interface with our own or other vendors Merging Units over the IEC 61850 9-2 Process Bus, thus completing Schneider Electrics offer of a full IEC 61850 solution for your substation.

Schneider Electric provides solutions that allow the migration from conventional or different legacy substation automation systems to IEC 61850 based SAS. Relays which have already been delivered with UCA2 on Ethernet can be easily upgraded to IEC 61850, while relays that support other communication protocols can be integrated using proxy servers.

Customer benefits

Cost effective solution due to reduced inter-wiringFlexible programming allowing relays and new protection

functions to be added without affecting physical wiringNo external protocol converters are required

MiCOM and PACiS working in harmony

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As standards, specifications and designs change from time to time, please ask for confirmation of the information given in this publication.

Publishing: Schneider ElectricDesign: Schneider ElectricPrinting:

This document has been printed on ecological paper

10-2010

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Schneider Electric35, rue Joseph Monier CS 30323 92506 Rueil-Malmaison Cedex, France Tel: +33 (0) 1 41 29 70 00

RCS Nanterre 954 503 439 Capital social 896 313 776 www.schneider-electric.com

IEC 61850 StandardCommunication

IEC 61850 OFFERS THE FOLLOWING BENEFITS TO UTILITIES AND INDUSTRIAL USERS:

High speed data exchange

Ethernet links operating at 100 Mbit/s exchange polled data and commands between devices at a far faster rate than traditional serial/ fieldbus protocols. Clients (master stations) can perform supervisory control with negligible delay.Client-Server replaces Master-Slave communications and allows simultaneous access of several clients to the same server.

Peer-to-peer communication

Since all Intelligent Electronic Devices (IEDs) within the substation can communicate with each other using reliable high-speed peer-to-peer communications, extensive hardwiring in equipment bays is eliminated and the cost of implementing advanced distributed protection and control schemes is significantly reduced. Generic Substation Event (GSE) messages can be used for interlocking, disturbance recording cross-triggering, breaker failure protection tripping, directional comparison bus protection and many other advanced applications.

Process bus interface

Analog interface units (or Merging Units) located in the substation yard interface with conventional or non-conventional instrument transformers and send the sampled current and voltage values over fiber, thus significantly reducing (actually eliminating) the copper wires between the substation primary equipment and the protection, control and measuring devices.

Standard bay schemes

Economies of scale will result where standardprotection and control bay schemes are engineered. The exact customising of the scheme to suit the application is achieved in software, using GSE logic.

True interoperability

The self-descriptive nature of IEC 61850-compatible IEDs means that system integration and commissioning is easier.

Standardised data classes and services meanIEC 61850-enabled MiCOM IEDs can operateseamlessly in multi-vendor environments.

Uniformity

One protocol is all that is needed in the substation. Costly gateways and split path communications are thus avoided. Peer-to-peer messages, control commands, disturbance files transfer or event driven reports are interleaved on a single Substation Bus network. Multiple clients can be integrated, allowing authorised operators and engineers to interrogate and control the substation IEDs.

Simplified engineering process

The Substation Configuration Language defined in the standard represents a leap in the engineering process related to any type of substation automation application. It is based on a standardized abstract object model that allows the development of substation specification, configuration, analysis and testing tools

MiCOM CAPABILITY

The IEC 61850 interface of the MiCOM P range relays initially provides the following capabilities:

Object model covering IED measurements, protection, control and recording functions

GSE : High-speed Peer-to-Peer Communication Read access to measurements and statuses Generation of reports on changes of

measurements. Measurement reports can be generated when user defined criteria have been met. This will usually be in the form of a setting such as percentage change of a measurement (deadband).

Direct Control or Select Before Operate (SBO) with normal or enhanced security

Generation of reports on changes of status. Status reports can be generated by protection events when user-defined reporting criteria have been met.

SNTP Time Synchronisation Disturbance Record Extraction

The MiCOM S1 engineering tool allows configuration and setting transfers of IEC 61850- enabled MiCOM IEDs via traditional communication links or via an Ethernet connection, whether or not an IEC 61850 based control system is present.