1. © ABB - Page 1 Long lifetime guaranteed for IEC 61850 Designed for the future... SCL ACSI APP COM

2. © ABB - Page 2 Application and communication separated Abstract Communications Services Interface (ACSI), separates the application from the communication ACSI APP COM Slowly changing applications must be separated and protected from fast advancing communication technology. This safeguards investments in the applications while at the same time allow to use up to date communication technology

3. © ABB - Page 3 Free function allocation Free allocation of functions on all levels, no assumptions or constraints are imposed by the standard on the substation architecture If the architecture is a centralized RTU based architectures with one computational element and parallel wiring from the primary equipment or a fully distributed architecture with intelligent sensors and actuators connected via a process bus does not matter. All possible architectures are equally and well supported by the standard.

4. © ABB - Page 4 Extension for the future All applications defined today for substation automation are included and supported in the standard. This is however not enough. The standard also have an object model and set of rules that makes it possible to extend the scope of the standard and include new applications in the future, all this without need for additions or changes to the standard itself. Extension rules governs how to extend the scope of the standard in order to support new applications

5. © ABB - Page 5 Substation Configuration Language SCL SCL: Substation Configuration Language, is a formal description of the communication in a substation All communication related configurations are supported by one neutral and formal description. The description can serve as support for engineering and automatic testing.

6. © ABB - Page 6 Global interoperability Global interoperability allows a global market competition Global market access for the same interoperable solutions for vendors as well as customers will lead to cost efficient solutions.