1. IEC Substation Configuration Language and Its Impact on the Engineering of Distribution Substation Systems
Notes
Dr. Alexander Apostolov

2. Requirements for Engineering Tools
Improvements in the engineering process is one of the key requirements for the success of IEC 61850
Tools that support different steps in the engineering process are being developed
The dream: completely automatic engineering process

3. SAS Engineering Tools Used to: Project design tools
Determine and to document the application specific functionality
Determine and to document the integration of devices into the SAS
Project design tools
Configuration tools
Documentation tools

4. SAS Engineering Tools
SCL is used also to describe all data needed to define system parameters for a single IED
This includes especially the binding of the IED and its functions to the substation itself, in terms of its single line diagram to the communication system
The Substation Configuration Language is based on UML and XML

5. UML
The heart of object-oriented problem solving is the construction of a model.
The model abstracts the essential details of the underlying problem from its usually complicated real world.
Several modeling tools are wrapped under the heading of the UML™, which stands for Unified Modeling Language™.

6. UML
The Unified Modeling Language (UML) is a standard language for specifying, visualizing, constructing, and documenting the artifacts of different simple or complex systems.
UML uses mostly graphical notations to express the design of software projects. Using the UML helps project teams communicate, explore potential designs, and validate the architectural design of the system.

7. UML The UML is applicable to object-oriented problem solving.
A model is an abstraction of the underlying problem.
The domain is the actual world from which the problem comes.
Models consist of objects that interact by sending each other messages.
Objects have things they know (attributes) and things they can do (services).

8. Objectives

9. XML
Extensible means that it can be advanced to meet specific needs by creating descriptive tags to fit the requirements of the problem domain
Files can be edited using off-the-shelf text editors
Availability of specialized tools

10. <pickup>1.5</ pickup >
Markup description
<pickup>1.5</ pickup >
Markup declaration open
Markup declaration close
Element name
Element termination
Element content

11. XML Applications
Part 6 of the IEC standard specifies a description language for configurations of electrical substation IEDs Substation Configuration Language (SCL) based on XML
It is used to describe IED configurations and communication systems according to parts 5 and 7 of this standard.
Description of the relations between the substation automation system and the substation (switchyard) itself

12. Substation Configuration Language Components
Substation section: describes the substation single line diagram, and its binding to logical nodes as well as the placement of logical nodes onto IEDs. Thus also the binding of IEDs to substation parts and substation devices is defined.

13. Substation Configuration Language Components
Communication section: describes the communication connections between IEDs in terms of connecting communication links.

14. Substation Configuration Language Components
IED section: describes the capabilities (configuration) of one or more IEDs, and the binding to logical nodes on other IEDs.
LNType section: defines which data objects are actually contained within the logical node instances defined for the IEDs.

15. SCL UML Diagram Example

16. SCL Examples

17. SCL Files
Data exchange from a system specification tool to the system configuration tool. This file describes the single line diagram of the substation and the required logical nodes. The file extension shall be .SSD for System Specification Description.

18. SCL Files
Data exchange from the IED configuration tool to the system configuration tool. This file describes the capabilities of an IED. The file extension shall be .ICD for IED Capability Description.

19. SCL Files
Data exchange from the system configuration tool to IED configuration tools.
This file contains all IEDs, communication configuration and substation description sections.
The file extension shall be .SCD for Substation Configuration Description.

20. SCL Files
It is an SCD file, possibly stripped down to what the concerned IED shall know.
The file extension shall be .CID for Configured IED Description.

21. SAS Engineering Process
Define the functional specification according to the approved protection, automation and control concepts and user’s standards. This is done using the substation one line diagram and defining:
Protection functions required for each primary substation or system component

22. SAS Engineering Process
Measurements and status information needed
Controls to be used
Reporting requirements
Monitoring and recording requirements

23. SAS Engineering Process
Redundancy requirements
Communications architecture
Substation level functions
Other as necessary
All of the above should be produced by a system specification tool that provides as an output an SSD file.

24. SAS Engineering Process
Utility
Standards
Functional
Specification

25. SAS Engineering Process

26. Benefits Quite significant Reduce the costs for system design
Improve factory and site acceptance testing
Improve the maintenance process
Improve the overall quality of the substation automation system