Graeme West Centre for Electrical Power Engineering Supervisor : Prof. J McDonald

1. Intelligent Decision Support for Protection Scheme Design Associated with Electrical Transmission Systems. Graeme West Centre for Electrical Power Engineering Supervisor : Prof. J McDonald

2. Introduction Background Motivations Description of Work Conclusions Overview of Presentation

3. Project jointly funded by NGC and ScottishPower Aims : Provide a “virtual source” of information for protection engineers. Provide engineering support related to the protection system design, application and management process. Resulted in the development of DEKAS (Design Engineering Knowledge Application System) Introduction

4. Problem Domain Generation (Coal, Hydro, Nuclear) Transmission Grid (400kV, 275kV, 132kV) Distribution (66kV, 33kV) Customer (415V, 240V) • Equipment at each stage needs protection against damage caused by faults. • This project focuses on the protection of the transmission grid.

5. Improve the quality of data and information available to the engineer at the inception of a design by standardising the capture, storage and dissemination of data and information. Optimise core design time, providing engineers with more time for checking and modification of designs. Supplement existing training methods by provision of on-line decision support and guidance throughout the design process. Motivations

6. 3 main stages of development Stage 1 : Information Roadmap : Overview of domain Stage 2 : Knowledge models of design process with access to relevant documentation Stage 3 : Provide intelligent support through the use of case-based reasoning DEKAS : Design Engineering Knowledge Application System

7. A series of knowledge elicitation meetings with experts from both companies. Established common high level design approach to protection design. Identification of main types of resources required at each stage of design process. Information Roadmap

8. Series of knowledge elicitation meetings to capture the design process. Modelled using KADS methodology. Implemented using ASP over the company intranets Links to company data repositories. E.g. standards, databases, etc. Stage 1 : DEKAS : Completed

9. Task Inference Navigation Through Modelled Design Process

10. DEKAS Screenshot

11. A frequent resource that is used during the process is documentation from previous projects. Indicates a case-based reasoning (CBR) approach may be appropriate. Integration of CBR with existing design process models. Stage 2 : Intelligent Support : In Progress

12. An AI technique which aims to emulate the way in which humans use previous experiences to solve current problems. A CBR systems consists of : A case base A matching algorithm Four RE process : REtrieve, REuse, REvise, REtain What is Case-Based Reasoning?

13. RETRIEVE the most similar problem case REUSE the knowledge (i.e. previous solution) REVISE the knowledge RETAIN the knowledge DEKAS CBR Process Generic CBR Process RETRIEVE the previous protection design project most similar to the current project REUSE the relevant sections of the protection scheme design associated with the retrieved protection design project REVISE previous protection scheme design where necessary to suit current project RETAIN completed protection design project case structure and associated protection scheme design within the case base

14. Provides a single source of data, information and knowledge distributed throughout the companies. Case-based reasoning through the company intranet promotes sharing of past experiences throughout the company. Standardises design practices by promoting a consistent approach to engineering design. Conclusions