Design of the electrical power system

The objectives of the power system design and choice of equipment are to ensure maximum security of supplies with operational flexibility at an acceptable cost. The paper describes the development of the design, from the conceptual pretender stage to the completion of manufacture of equipment ready for shipment to the site. In the development of the design a number of problems are identified, relating to the constraints of fault levels and voltage regulation on power systems with large induction-motor loads. Alternative solutions are examined, and reasons given for the solution adopted. The importance of computer modelling is emphasised in the analysis of power system design, not only for the solution of technical problems, but for optimisation to realise any cost advantages available. Finally, the authors indicate their views on future trends in system design for large power stations, and conclude that the objectives of supply security, operational flexibility and acceptable cost have been achieved at Castle Peak B.