SC-B5 Colloquium Calgary 2005 CIGRE SC B5 COLLOQUIUM CALGARY Contribution to PS2 – Q#1 How does the specification team value this user input and rank prioritization of the requirements ? How should lower priority requirements be stated in the specification since these requirements may easily be fulfilled by the technical solution at minimal cost ? CIGRE SC B5 COLLOQUIUM CALGARY Contribution to PS2 – Q#1 How does the specification team value this user input and rank prioritization of the requirements ? How should lower priority requirements be stated in the specification since these requirements may easily be fulfilled by the technical solution at minimal cost ? Florin Balasiu, Transelectrica Romania

SC-B5 Colloquium Calgary 2005 Costumer technical specifications contain: 1. Functional requirements system functions protection functions supervision&control functions 2. Performance requirements overall performance – time synchronisation and time response reliability, availability, security requirements maintainability and expandability 3. Constrains interfaces to NCC and to Protection-Control Centre limitations due to existing buildings, roads, preserved structures Prioritization of requirements

SC-B5 Colloquium Calgary 2005 Functional requirements for OHL protection functions example Mandatory Suggested

SC-B5 Colloquium Calgary 2005 Mind the importance of the substation in the grid e.g. only main 1 protection for certain 220 kV OHLs Focus on “what” instead of “how”. Avoid too many details. e.g. protection&control architecture functional redundancy – n-1 criterion Preference for requirements based on international standards Extensive use of previous experience – updated internal procedures Use weighting questionnaires for divergent issues Use old stagers together with young ones Prioritization of requirements – Hard task